Details of the Researcher

PHOTO

Takafumi Aoki
Section
Board Member
Job title
Executive Vice President
Degree
  • 博士(工学)(東北大学)

e-Rad No.
80241529

Committee Memberships 9

  • 大学ICT推進協議会 会長

    2023/05 - Present

  • 一般社団法人日本歯科専門医機構 専門医申請学会評価認定委員

    2018/06 - Present

  • 大学ICT推進協議会 理事

    2022/05 - 2023/05

  • 映像情報メディア学会 編集長

    2016/05 - 2018/05

  • 大学ICT推進協議会 副会長

    2015/05 - 2016/05

  • 大学ICT推進協議会 理事

    2012/05 - 2016/05

  • 計測自動制御学会 常務理事

    2010/02 - 2012/02

  • 映像情報メディア学会 理事

    2008/06 - 2010/05

  • IEEE Japan Council 理事

    2005/01 - 2006/12

Show all ︎Show first 5

Research Areas 2

  • Informatics / Computer systems /

  • Informatics / Perceptual information processing /

Awards 44

  1. MIRUインタラクティブ発表賞

    2023/07 画像の認識・理解シンポジウム2023 プライバシ保護のための特徴量埋め込みに基づく顔画像の非識別化とその性能評価

  2. Best Oral Presentation Award

    2023/01 International Forum on Medical Imaging in Asia 2023 Accuracy Improvement of Ultrasound Probe Pose Estimation Using Convolutional Neural Network by Image Reconstruction Loss for 3D Ultrasound Image Reconstruction

  3. MIRUフロンティア賞

    2021/08 第24回 画像の認識・理解シンポジウム ステガノグラフィを用いたプライバシ保護顔認証とその安全性評価

  4. Best Student Paper Award

    2019/10/01 19th IEEE International Conference on Bioinformatics and Bioengineering (BIBE2019)

  5. Excellent Paper Award

    2019/10/01 2019 IEEE 8th Global Conference on Consumer Electronics (GCCE 2019)

  6. Fundamentals Review ベストオーサー賞

    2019/09/01 電子情報通信学会 基礎・境界ソサイエティ

  7. Best Paper Award

    2019/09/01 18th International Conference of the Biometrics Special Interest Group (BIOSIG 2019)

  8. 映像情報メディア学会 丹羽髙柳賞論文賞

    2015/01 映像情報メディア学会

  9. LSIとシステムのワークショップ 優秀ポスター賞(学生部門)

    2015/01 LSIとシステムのワークショップ

  10. 2014暗号と情報セキュリティシンポジウム イノベーション論文賞

    2015/01 2014暗号と情報セキュリティシンポジウム

  11. The 16th Workshop on Cryptographic Hardware and Embedded Systems Best Paper Award

    2014/01 The 16th Workshop on Cryptographic Hardware and Embedded Systems

  12. 河北文化賞

    2014/01 河北新報

  13. 2013暗号と情報セキュリティシンポジウム イノベーション論文賞

    2014/01 2013暗号と情報セキュリティシンポジウム

  14. 感謝状「東日本大震災の身元確認作業」

    2013/01 宮城県警察本部

  15. 社会貢献財団 社会貢献者表彰

    2013/01 社会貢献財団

  16. 2013 IEEE International Symposium on Electromagnetic Compatibility Best Symposium Paper Award

    2013/01 IEEE International Symposium on Electromagnetic Compatibility Best Symposium

  17. 「情報通信月間」東北総合通信局長表彰

    2013/01 東北総合通信局

  18. 多値論理フォーラム奨励賞

    2013/01 多値論理フォーラム

  19. 感謝状「東日本大震災における身元不明者の確認作業への貢献」

    2012/01 宮城県歯科医師会

  20. 感謝状「第49期、第50期理事として支部協議会を担当」

    2012/01 計測自動制御学会

  21. 感謝状

    2011/10/27 宮城県警察本部 東日本大震災における身元確認活動の協力

  22. IEEE Symposium on Low-Power and High-Speed Chips (COOL Chips XIV) Best Poster Award

    2011/04 COOL Chips XIV GPU Implementation of Phase-Based Image Correspondence Matching and Its Evaluation

  23. 感謝状

    2011/01/21 群馬県警察本部 2010年の画像解析による犯罪捜査協力に対して

  24. 2010年マルチメディア,分散,協調とモバイル (DICOMO2010) シンポジウム 優秀論文賞

    2010/08/25 2010年マルチメディア,分散,協調とモバイル実行委員会

  25. 2009年コンピュータセキュリティシンポジウム優秀論文賞受賞

    2009/10 2009年コンピュータセキュリティシンポジウム実行委員会

  26. 市村学術賞貢献賞

    2008/04/25 新技術開発財団

  27. Workshop on Synthesis And System Integration of Mixed Information technologies, Best Paper Award

    2007/10 18.Workshop on Synthesis And System Integration of Mixed Information technologies

  28. IEEE International Symposium on Multiple-Valued Logic, Outstanding Contributed Paper Award

    2006/05 IEEE International Symposium on Multiple-Valued Logic

  29. 第7回LSI IPデザイン・アワード完成表彰部門 IP章

    2005/05/19 LSI IPデザイン・アワード運営委員会 算術アルゴリズム記述言語に基づく乗算器モジュールジェネレータ

  30. IEEE International Symposium on Multiple-Valued Logic, Outstanding Contributed Paper Award

    2001/05/23 IEEE An Efficient Data Transmission Technique for VLSI Systems Based on Multiple-Valued Code-Division Multiple Access

  31. IEEE International Symposium on Multiple-Valued Logic, Outstanding Contributed Paper Award

    2000/05 IEEE Redundant Complex Arithmetic and Its Application to Complex Multiplier Design

  32. IEEE International Symposium on Intelligent Signal Processing and Communication Systems, Best Paper Award

    1999/12 IEEE A Digital Reaction-Diffusion System for Texture Image Processing

  33. The IEE Mountbatten Premium Award

    1999/09 IEE Enzyme Transistor Circuits

  34. IEICE Inose Award

    1997/05/17

  35. IEICE Outstanding Transactions Paper Award

    1997/05/17

  36. 電子情報通信学会学術奨励賞

    1996/03 電子情報通信学会 酵素トランジスタ:電子情報通信学会総合大会

  37. 第6回トーキン科学技術振興財団研究奨励賞

    1996/03 財団法人 トーキン科学技術振興財団 多波長光コンピューティングに関する研究

  38. 第1回青葉工学振興会研究奨励賞

    1995/11 財団法人 青葉工学振興会 多波長光コンピューティングに関する研究

  39. Hiroshi Ando Memorial Award

    1995/06

  40. The IEE Ambrose Fleming Premium Award

    1994/09 IEE Design of Frequency-Mode Set-Valued Logic Networks

  41. The Telecommunications Advancement Foundation Award

    1993/03/25

  42. Niwa Memorial Award

    1993/02

  43. IEICE Outstanding Transactions Paper Award

    1990/05/19

  44. IEEE International Symposium on Multiple-Valued Logic, Outstanding Paper Award

    1990/05 IEEE Design of a Highly Parallel Set Logic Network Based on a Bio-Device Model

Show all ︎Show 5

Papers 562

  1. Image quality improvement in single plane-wave imaging using deep learning Peer-reviewed

    Kanta Miura, Hiromi Shidara, Takuro Ishii, Koichi Ito, Takafumi Aoki, Yoshifumi Saijo, Jun Ohmiya

    Ultrasonics 145 107479-107479 2025/01

    Publisher: Elsevier BV

    DOI: 10.1016/j.ultras.2024.107479  

    ISSN: 0041-624X

  2. High-resolution Microscopic Image Dataset of Freshwater Plankton in Japanese Lakes and Reservoirs (FREPJ): I. Zooplankton Peer-reviewed

    Yurie Otake, Aoi Osone, Wataru Makino, Koichi Ito, Takafumi Aoki, Kanta Miura, Yoshinobu Hayakawa, Ryotaro Yoshida, Satoshi Ichise, Akihiro Tuji, Jotaro Urabe

    Bulletin of the National Museum of Nature and Science. Series B, Botany 50 (4) 159-164 2024/11

    DOI: 10.50826/bnmnsbot.50.4_159  

  3. Face image de-identification based on feature embedding

    Goki Hanawa, Koichi Ito, Takafumi Aoki

    EURASIP Journal on Image and Video Processing 2024 (1) 2024/09/02

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1186/s13640-024-00646-z  

    eISSN: 1687-5281

  4. Retinal Layer Segmentation Using 1D+2D U-Net from OCT Images Peer-reviewed

    Tsubasa Konno, Takahiro Ninomiya, Kanta Miura, Koichi Ito, Noriko Himori, Parmanand Sharma, Toru Nakazawa, Takafumi Aoki

    2024 IEEE International Symposium on Biomedical Imaging (ISBI) 1-5 2024/05/27

    Publisher: IEEE

    DOI: 10.1109/isbi56570.2024.10635426  

  5. Neural Radiance Field-Inspired Depth Map Refinement for Accurate Multi-View Stereo. Peer-reviewed

    Shintaro Ito, Kanta Miura, Koichi Ito, Takafumi Aoki

    J. Imaging 10 (3) 68-68 2024/03

    DOI: 10.3390/jimaging10030068  

  6. Multibiometrics Using a Single Face Image.

    Koichi Ito, Taito Tonosaki, Takafumi Aoki, Tetsushi Ohki, Masakatsu Nishigaki

    CoRR abs/2409.20003 2024

    DOI: 10.48550/arXiv.2409.20003  

  7. Formula-Driven Data Augmentation and Partial Retinal Layer Copying for Retinal Layer Segmentation.

    Tsubasa Konno, Takahiro Ninomiya, Kanta Miura, Koichi Ito, Noriko Himori, Parmanand Sharma, Toru Nakazawa, Takafumi Aoki

    OMIA@MICCAI 136-145 2024

    DOI: 10.1007/978-3-031-73119-8_14  

  8. FSErasing: Improving Face Recognition with Data Augmentation Using Face Parsing Peer-reviewed

    Hiroya Kawai, Koichi Ito, Hwann-Tzong Chen, Takafumi Aoki

    IET Biometrics 2024 (1) 2024/01

    Publisher: Institution of Engineering and Technology (IET)

    DOI: 10.1049/2024/6663315  

    ISSN: 2047-4938

    eISSN: 2047-4946

    More details Close

    We propose original semantic labels for detailed face parsing to improve the accuracy of face recognition by focusing on parts in a face. The part labels used in conventional face parsing are defined based on biological features, and thus, one label is given to a large region, such as skin. Our semantic labels are defined by separating parts with large areas based on the structure of the face and considering the left and right sides for all parts to consider head pose changes, occlusion, and other factors. By utilizing the capability of assigning detailed part labels to face images, we propose a novel data augmentation method based on detailed face parsing called Face Semantic Erasing (FSErasing) to improve the performance of face recognition. FSErasing is to randomly mask a part of the face image based on the detailed part labels, and therefore, we can apply erasing‐type data augmentation to the face image that considers the characteristics of the face. Through experiments using public face image datasets, we demonstrate that FSErasing is effective for improving the performance of face recognition and face attribute estimation. In face recognition, adding FSErasing in training ResNet‐34 with Softmax using CelebA improves the average accuracy by 0.354 points and the average equal error rate (EER) by 0.312 points, and with ArcFace, the average accuracy and EER improve by 0.752 and 0.802 points, respectively. ResNet‐50 with Softmax using CASIA‐WebFace improves the average accuracy by 0.442 points and the average EER by 0.452 points, and with ArcFace, the average accuracy and EER improve by 0.228 points and 0.500 points, respectively. In face attribute estimation, adding FSErasing as a data augmentation method in training with CelebA improves the estimation accuracy by 0.54 points. We also apply our detailed face parsing model to visualize face recognition models and demonstrate its higher explainability than general visualization methods.

  9. Accuracy Improvement of Depth Map Estimation from Multi-View Images Using NeRF. Peer-reviewed

    Shintaro Ito, Kanta Miura, Koichi Ito, Takafumi Aoki

    VCIP 1-5 2023/12

    DOI: 10.1109/VCIP59821.2023.10402609  

  10. Depth Map Estimation from Multi-View Images with Nerf-Based Refinement Peer-reviewed

    Shintaro Ito, Kanta Miura, Koichi Ito, Takafumi Aoki

    2023 IEEE International Conference on Image Processing (ICIP) 2955-2959 2023/10/08

    Publisher: IEEE

    DOI: 10.1109/icip49359.2023.10222229  

  11. Retinal Layer Segmentation from Oct Images Using 2D-3D Hybrid Network with Multi-Scale Loss and Refinement Module Peer-reviewed

    Tsubasa Konno, Takahiro Ninomiya, Kanta Miura, Koichi Ito, Noriko Himori, Parmanand Sharma, Toru Nakazawa, Takafumi Aoki

    2023 IEEE 20th International Symposium on Biomedical Imaging (ISBI) 1-4 2023/04/18

    Publisher: IEEE

    DOI: 10.1109/isbi53787.2023.10230693  

  12. PM-MVS: PatchMatch multi-view stereo Peer-reviewed

    Koichi Ito, Takafumi Ito, Takafumi Aoki

    Machine Vision and Applications 34 (2) 32-32 2023/03

    DOI: 10.1007/s00138-023-01380-8  

  13. Zooplankton Classification Using Hierarchical Attention Branch Network

    Koichi Ito, Kanta Miura, Takafumi Aoki, Yurie Otake, Wataru Makino, Jotaro Urabe

    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 14407 LNCS 409-419 2023

    DOI: 10.1007/978-3-031-47637-2_31  

    ISSN: 0302-9743

    eISSN: 1611-3349

  14. Pose Estimation of Ultrasound Probe Using CNN and RNN with Image Reconstruction Loss

    Kanta Miura, Koichi Ito, Takafumi Aoki, Jun Ohmiya

    Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 1-4 2023

    DOI: 10.1109/EMBC40787.2023.10340326  

    ISSN: 1557-170X

  15. Eye Biometrics Combined with Periocular and Iris Recognition Using CNN

    Taito Tonosaki, Shokei Kawakami, Koichi Ito, Takafumi Aoki, Yoshiko Yasumura, Masakazu Fujio, Yosuke Kaga, Kenta Takahashi

    2023 Asia Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2023 1804-1810 2023

    DOI: 10.1109/APSIPAASC58517.2023.10317444  

  16. Face Image De-identification Based on Feature Embedding for Privacy Protection

    Goki Hanawa, Koichi Ito, Takafumi Aoki

    BIOSIG 2023 - Proceedings of the 22nd International Conference of the Biometrics Special Interest Group 2023

    DOI: 10.1109/BIOSIG58226.2023.10345990  

  17. Pose Estimation of Ultrasound Probe Using CNN and RNN with Image Reconstruction Loss.

    Kanta Miura, Koichi Ito, Takafumi Aoki, Jun Ohmiya

    EMBC 1-4 2023

    DOI: 10.1109/EMBC40787.2023.10340326  

  18. Face Image De-identification Based on Feature Embedding for Privacy Protection.

    Goki Hanawa, Koichi Ito, Takafumi Aoki

    BIOSIG 1-6 2023

    DOI: 10.1109/BIOSIG58226.2023.10345990  

  19. Eye Biometrics Combined with Periocular and Iris Recognition Using CNN.

    Taito Tonosaki, Shokei Kawakami, Koichi Ito, Takafumi Aoki, Yoshiko Yasumura, Masakazu Fujio, Yosuke Kaga, Kenta Takahashi

    APSIPA ASC 1804-1810 2023

    DOI: 10.1109/APSIPAASC58517.2023.10317444  

  20. Zooplankton Classification Using Hierarchical Attention Branch Network.

    Koichi Ito, Kanta Miura, Takafumi Aoki, Yurie Otake, Wataru Makino, Jotaro Urabe

    ACPR (2) 409-419 2023

    DOI: 10.1007/978-3-031-47637-2_31  

  21. Cancelable Face Recognition Using Deep Steganography

    Koichi Ito, Takashi Kozu, Hiroya Kawai, Goki Hanawa, Takafumi Aoki

    IEEE Transactions on Biometrics, Behavior, and Identity Science 6 (1) 1-1 2023

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/tbiom.2023.3327694  

    eISSN: 2637-6407

  22. A Simple and Accurate CNN for Iris Recognition

    Shokei Kawakami, Hiroya Kawai, Koichi Ito, Takafumi Aoki, Yoshiko Yasumura, Masakazu Fujio, Yosuke Kaga, Kenta Takahashi

    2022 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC) 2022/11/07

    Publisher: IEEE

    DOI: 10.23919/apsipaasc55919.2022.9980056  

  23. Eyeglass Frame Segmentation for Face Image Processing

    Kanta Miura, Takamichi Miyamoto, Kazuyuki Sakurai, Koichi Ito, Takafumi Aoki

    2022 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC) 2022/11/07

    Publisher: IEEE

    DOI: 10.23919/apsipaasc55919.2022.9980279  

  24. Spoofing Attack Detection in Face Recognition System Using Vision Transformer with Patch-wise Data Augmentation

    Kota Watanabe, Koichi Ito, Takafumi Aoki

    2022 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC) 2022/11/07

    Publisher: IEEE

    DOI: 10.23919/apsipaasc55919.2022.9979996  

  25. Accurate and Robust Image Correspondence for Structure-From-Motion and its Application to Multi-View Stereo

    Shuhei Hoshi, Koichi Ito, Takafumi Aoki

    2022 IEEE International Conference on Image Processing (ICIP) 2022/10/16

    Publisher: IEEE

    DOI: 10.1109/icip46576.2022.9897304  

  26. Fingerprint Feature Extraction Using CNN with Multiple Attention Mechanisms

    Nagisa Sasuga, Koichi Ito, Takafumi Aoki

    2022 IEEE International Joint Conference on Biometrics (IJCB) 2022/10/10

    Publisher: IEEE

    DOI: 10.1109/ijcb54206.2022.10007957  

  27. Perfusion defects in non-enlarged metastatic lymph nodes using vessel wall magnetic resonance imaging: Detection performance and diagnostic value. International-journal

    Maya Sakamoto, Ikuho Kojima, Masahiro Iikubo, Koichi Ito, Takafumi Aoki, Shiro Mori, Takenori Ogawa, Yukio Katori, Takaki Murata, Daisuke Ito, Tetsuya Kodama

    Clinical & experimental metastasis 2022/02/04

    DOI: 10.1007/s10585-022-10147-w  

    More details Close

    A perfusion defect (PD) in non-enlarged lymph nodes (LNs) of oral squamous cell carcinoma (OSCC) is the most reliable radiological criterion for the diagnosis of metastasis. However, conventional contrast-enhanced (CE) T1 weighted images using turbo spin echo (TSE) sequence is limited in detecting PD in non-enlarged LNs due to flow artifacts from cervical blood vessels. Vessel wall (VW) MR imaging with blood vessel flow suppression and high spatial resolution may provide new insights into the detection of PD. However, there are no reports in the literature on the usefulness of VW MR imaging for the diagnosis of LN metastasis. It is demonstrated that PD of non-enlarged LNs in CE VR MR imaging of OSCC patients is useful for the diagnosis of metastatic LNs. VW MR imaging was significantly more sensitive in detecting PD of non-enlarged metastatic LNs than conventional TSE imaging on visual evaluation. Furthermore, it was found that the image contrast between PD and surrounding intranodal tissue in CE VW MR images was higher than that in conventional CE TSE images. In the correlation between imaging and histopathological findings of metastatic LNs, all LNs that exhibited PD on CE VW MR images were at an advanced histopathological metastatic stage. The pathology of PD was necrotic tissue with keratinization. The results indicated that PD in CE VW imaging is useful in diagnosing non-enlarged LNs at an advanced metastasis stage. The addition of VW MR imaging to conventional MR examination achieves higher diagnostic performance for non-enlarged metastatic LNs.

  28. Fundamental Study of Neonate Fingerprint Recognition Using Fingerprint Classification.

    Yoshinori Koda, Haruki Imai, Nagisa Sasuga, Koichi Ito, Takafumi Aoki, Satoshi Kaneko, Samson Muuo Nzou

    BIOSIG 162-172 2022

    DOI: 10.1109/BIOSIG55365.2022.9897017  

  29. Phase-Based Palmprint Identification with Convolutional Sparse Coding

    Luis Rafael Marval-Perez, Koichi Ito, Takafumi Aoki

    IEEE Transactions on Biometrics, Behavior, and Identity Science 1-1 2022

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/tbiom.2022.3183568  

    eISSN: 2637-6407

  30. Face Attribute Estimation Using Multi-Task Convolutional Neural Network.

    Hiroya Kawai, Koichi Ito, Takafumi Aoki

    J. Imaging 8 (4) 105-105 2022

    DOI: 10.3390/jimaging8040105  

  31. HandSegNet: Hand segmentation using convolutional neural network for contactless palmprint recognition.

    Koichi Ito, Yusei Suzuki, Hiroya Kawai, Takafumi Aoki, Masakazu Fujio, Yosuke Kaga, Kenta Takahashi

    IET Biom. 11 (2) 109-123 2022

    DOI: 10.1049/bme2.12058  

  32. Probe localization from ultrasound image sequences using deep learning for volume reconstruction

    Kanta Miura, Koichi Ito, Takafumi Aoki, Jun Ohmiya, Satoshi Kondo

    International Forum on Medical Imaging in Asia 2021 2021/04/20

    Publisher: SPIE

    DOI: 10.1117/12.2590805  

  33. Performance improvement of Alzheimer's disease classification inspired by CNN in brain age estimation

    Daiki Endo, Koichi Ito, Takafumi Aoki

    International Forum on Medical Imaging in Asia 2021 2021/04/20

    Publisher: SPIE

    DOI: 10.1117/12.2590826  

  34. Pose Estimation of 2D Ultrasound Probe from Ultrasound Image Sequences Using CNN and RNN.

    Kanta Miura, Koichi Ito, Takafumi Aoki, Jun Ohmiya, Satoshi Kondo

    Simplifying Medical Ultrasound - Second International Workshop(ASMUS@MICCAI) 96-105 2021

    Publisher: Springer

    DOI: 10.1007/978-3-030-87583-1_10  

  35. Accurate 3D Measurement from Two SAR Images Without Prior Knowledge of Scene.

    Karl Insfran, Koichi Ito, Takafumi Aoki

    IEEE International Geoscience and Remote Sensing Symposium(IGARSS) 4814-4817 2021

    Publisher: IEEE

    DOI: 10.1109/IGARSS47720.2021.9554386  

  36. A Comprehensive Study of Face Recognition Using Deep Learning.

    Koichi Ito, Hiroya Kawai, Takafumi Aoki

    APSIPA ASC 1762-1768 2021

  37. Is CNN Really Looking at Your Face?

    Hiroya Kawai, Takashi Kozu, Koichi Ito, Hwann-Tzong Chen, Takafumi Aoki

    ACPR (1) 525-539 2021

    DOI: 10.1007/978-3-031-02375-0_39  

  38. A Systematic Design Methodology of Formally-Proven Side-Channel-Resistant Cryptographic Hardware

    Rei Ueno, Naofumi Homma, Sumio Morioka, Takafumi Aoki

    IEEE Design & Test 38 (3) 1-1 2021

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/mdat.2021.3063337  

    ISSN: 2168-2356

    eISSN: 2168-2364

  39. Localizing 2D Ultrasound Probe from Ultrasound Image Sequences Using Deep Learning for Volume Reconstruction Peer-reviewed

    Kanta Miura, Koichi Ito, Takafumi Aoki, Jun Ohmiya, Satoshi Kondo

    Medical Ultrasound, and Preterm, Perinatal and Paediatric Image Analysis 12437 97-105 2020/10/01

    Publisher: Springer International Publishing

    DOI: 10.1007/978-3-030-60334-2_10  

    ISSN: 0302-9743

    eISSN: 1611-3349

  40. Parallel implementation of string-based clustering for HT-SELEX data Peer-reviewed

    Shintaro Kato, Takayoshi Ono, Masaki Ito, Koichi Ito, Hirotaka Minagawa, Katsunori Horii, Ikuo Shiratori, Iwao Waga, Takafumi Aoki

    EAI Endorsed Trans. Bioengineering and Bioinformatics (e4) 1-11 2020/10/01

  41. Parameter optimization for detecting seismic ground deformation from airborne SAR images Peer-reviewed

    Koichi Ito, Haruki Imai, Takafumi Aoki, Jyumpei Uemoto

    Proceedings of IEEE International Geoscience and Remote Sensing Symposium 324-327 2020/09/01

    Publisher: IEEE

    DOI: 10.1109/IGARSS39084.2020.9324586  

  42. Fingerprint feature extraction by combining texture, minutiae, and frequency spectrum using multi-task CNN Peer-reviewed

    Ai Takahashi, Yoshinori Koda, Koichi Ito, Takafumi Aoki

    Proceedings of International Joint Conference on Biometrics 1-8 2020/09/01

    Publisher: IEEE

    DOI: 10.1109/IJCB48548.2020.9304861  

  43. ICF: A shape-based 3D segmentation method Peer-reviewed

    Koji Kobayashi, Takafumi Aoki, Koichi Ito

    Proceedings of Special Interest Group on Computer Graphics and Interactive Techniques Conference Posters 46-2 2020/08/01

    Publisher: ACM

    DOI: 10.1145/3388770.3407440  

  44. FSBC: fast string-based clustering for HT-SELEX data Peer-reviewed

    Shintaro Kato, Takayoshi Ono, Hirotaka Minagawa, Katsunori Horii, Ikuo Shiratori, Iwao Waga, Koichi Ito, Takafumi Aoki

    BMC Bioinformatics 21 (263) 1-10 2020/06/01

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1186/s12859-020-03607-1  

    eISSN: 1471-2105

  45. Challenges for SDGs Target 16.9 by Neonate Fingerprint Identification Technology Peer-reviewed

    Yoshinori KODA, Koichi ITO, Takafumi AOKI

    IEICE ESS Fundamentals Review 13 (4) 312-320 2020/04/01

    Publisher: Institute of Electronics, Information and Communications Engineers (IEICE)

    DOI: 10.1587/essfr.13.4_312  

    eISSN: 1882-0875

  46. Hand Segmentation for Contactless Palmprint Recognition Peer-reviewed

    Yusei Suzuki, Hiroya Kawai, Koichi Ito, Takafumi Aoki, Masakazu Fujio, Yosuke Kaga, Kenta Takahashi

    Lecture Notes in Computer Science 902-912 2020/02/23

    Publisher: Springer International Publishing

    DOI: 10.1007/978-3-030-41404-7_64  

    ISSN: 0302-9743

    eISSN: 1611-3349

  47. Determining the effective number and surfaces of teeth for forensic dental identification through the 3D point cloud data analysis Peer-reviewed

    Arofi Kurniawan, Kouya Yodokawa, Moe Kosaka, Koichi Ito, Keiichi Sasaki, Takafumi Aoki, Toshihiko Suzuki

    Egyptian Journal of Forensic Sciences 10 (3) 1-11 2020/02/01

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1186/s41935-020-0181-z  

    ISSN: 2090-536X

    eISSN: 2090-5939

  48. Fingerprint Feature Extraction by Combining Texture, Minutiae, and Frequency Spectrum Using Multi-Task CNN.

    Ai Takahashi, Yoshinori Koda, Koichi Ito, Takafumi Aoki

    CoRR abs/2008.11917 2020

  49. Performance Evaluation of Face Anti-Spoofing Method Using Deep Metric Learning from a Few Frames of Face Video.

    Koichi Ito, Asateru Kimura, Takafumi Aoki

    Asia-Pacific Signal and Information Processing Association Annual Summit and Conference(APSIPA) 1414-1419 2020

    Publisher: IEEE

  50. Attribute estimation using multi-CNNs from hand images Peer-reviewed

    Yi-Chun Lin, Yusei Suzuki, Hiroya Kawai, Koichi Ito, Hwann-Tzong Chen, Takafumi Aoki

    Proceedings of Asia-Pacific Signal and Information Processing Association Annual Summit and Conference 241-244 2019/11/01

  51. Phase-based periocular recognition with texture enhancement Peer-reviewed

    Luis Rafael Marval Perez, Koichi Ito, Takafumi Aoki

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E102-A (10) 1351-1363 2019/10/01

  52. Domain transformation of fingerprint images using CycleGAN Peer-reviewed

    Ai Takahashi, Yoshinori Koda, Koichi Ito, Takafumi Aoki

    Proceedings of IEEE Global Conference on Consumer Electronics 9-10 2019/10/01

  53. Performance evaluation of face attribute estimation method using DendroNet Peer-reviewed

    Hiroya Kawai, Koichi Ito, Takafumi Aoki

    Proceedings of IEEE Global Conference on Consumer Electronics 186-187 2019/10/01

  54. Parallel implementation of motif-based clustering for HT-SELEX dataset Peer-reviewed

    Takayoshi Ono, Shintaro Kato, Koichi Ito, Hirotaka Minagawa, Katsunori Horii, Ikuo Shiratori, Iwao Waga, Takafumi Aoki

    Proceedings of IEEE International Conference on Bioinformatics and Bioengineering 50-55 2019/10/01

  55. Development of 2,400ppi fingerprint sensor for capturing neonate fingerprint within 24 hours after birth Peer-reviewed

    Yoshinori Koda, Ai Takahashi, Koichi Ito, Takafumi Aoki, Satoshi Kaneko, Samson Muuo Nzou

    Lecture Notes in Informatics 296 (Proceedings of International Conference of the Biometrics Special Interest Group) 95-106 2019/09/01

  56. A method for observing seismic ground deformation from airborne SAR images Peer-reviewed

    Haruki Imai, Koichi Ito, Takafumi Aoki, Jyunpei Uemoto, Seiho Uratsuka

    Proceedings of the 2019 IEEE International Geoscience and Remote Sensing Symposium 1506-1509 2019/07/01

  57. Merged multi-CNN with parameter reduction for face attribute estimation Peer-reviewed

    Hiroya Kawai, Koichi Ito, Takafumi Aoki

    Proceedings of International Conference on Biometrics 2019/06/01

  58. Statistical Test Methodology for Evaluating Electromagmetic Information Leakage from Mobile Touchscreen Devices Peer-reviewed

    Ville Yli-Maeyry, Daisuke Miyata, Naofumi Homma, Yuichi Hayashi, Takafumi Aoki

    IEEE Transactions on Electromagnetic Compatibility 61 (4) 1107-1114 2019/04

  59. An age estimation method using 3D-CNN from brain MRI images Peer-reviewed

    Masaru Ueda, Koichi Ito, Kai Wu, Kazunori Sato, Yasuyuki Taki, Hiroshi Fukuda, Takafumi Aoki

    Proceedings of International Symposium on Biomedical Imaging 380-383 2019/04/01

  60. Highly efficient GF(28) inversion circuit based on hybrid GF representations.

    Rei Ueno, Naofumi Homma, Yasuyuki Nogami, Takafumi Aoki

    J. Cryptogr. Eng. 9 (2) 101-113 2019

    DOI: 10.1007/s13389-018-0187-8  

  61. A 3D reconstruction method using PMVS for a limited number of view points Peer-reviewed

    Junichi Hata, Koichi Ito, Takafumi Aoki

    Proceedings of SPIE 11049 (Proceedings of International Workshop on Advanced Image Technology 2019) 2019/01/01

  62. Characterizing Parallel Multipliers for Detecting Hardware Trojans

    Akira Ito, Rei Ueno, Naofumi Homma, Takafumi Aoki

    Journal of Applied Logics 5 (9) 1815-1831 2018/12/01

    Publisher: College Publications

    ISSN: 2631-9829 2631-9810

  63. Age and gender prediction from face images using convolutional neural network Peer-reviewed

    Koichi Ito, Hiroya Kawai, Takehisa Okano, Takafumi Aoki

    Proceedings of Asia-Pacific Signal and Information Processing Association Annual Summit and Conference 7-11 2018/11/01

  64. Outlier and artifact removal filters for multi-view stereo Peer-reviewed

    Kouya Yodokawa, Koichi Ito, Takafumi Aoki, Shuji Sakai, Takafumi Watanabe, Tomohito Masuda

    Proceedings of the 2018 IEEE International Conference on Image Processing 3638-3642 2018/10/01

  65. Non-Reversible Insertion Method for Hardware Trojans Based on Path Delay Faults Peer-reviewed

    Akira Ito, Rei Ueno, Naofumi Homma, Takafumi Aoki

    International Workshop on Security Proofs for Embedded Systems 50-67 2018/09

  66. Efficient fuzzy extractors based on ternary debiasing method for biased physically unclonable functions Peer-reviewed

    Manami Suzuki, Rei Ueno, Naofumi Homma, Takafumi Aoki

    IEEE Transactions on Circuits and Systems I: Regular Papers 66 (2) 616-629 2018/09

  67. Performance evaluation of age estimation from T1-weighted images using brain local features and CNN Peer-reviewed

    Koichi Ito, Ryuichi Fujimoto, Tzu-Wei Huang, Hwann-Tzong Chen, Kai Wu, Kazunori Sato, Yasuyuki Taki, Hiroshi Fukuda, Takafumi Aoki

    Proceedings of the 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society 694-697 2018/07/01

  68. Towards on-board elevation measurement using interferometry and radargrammetry from single-pass SAR images Peer-reviewed

    Koichi Ito, Shota Hishinuma, Takafumi Aoki, Jyunpei Uemoto, Seiho Uratsuka

    Proceedings of the 2018 IEEE International Geoscience and Remote Sensing Symposium 5816-5819 2018/07/01

  69. 口腔癌頸部リンパ節転移の節外進展診断における3テスラblack-blood MR imaging法の有用性

    阪本 真弥, 小嶋 郁穂, 飯久保 正弘, 西岡 貴志, 笹野 高嗣, 伊藤 康一, 青木 孝文, 小川 武則, 森 士朗, 小玉 哲也

    歯科放射線 58 (増刊) 54-54 2018/05

    Publisher: (NPO)日本歯科放射線学会

    ISSN: 0389-9705

    eISSN: 2185-6311

  70. On the detectability of hardware Trojans embedded in parallel multipliers Peer-reviewed

    Akira Ito, Rei Ueno, Naofumi Homma, Takafumi Aoki

    IEEE 48th International Symposium on Multiple-Valued Logic 62-67 2018/05

  71. Quarternary debiasing for physically unclonable functions Peer-reviewed

    Manami Suzuki, Rei Ueno, Naofumi Homma, Takafumi Aoki

    IEEE 48th International Symposium on Multiple-Valued Logic 7-12 2018/05

  72. On the evaluation of electromagnetic information leakage from mobile device screens Peer-reviewed

    Ville Yli-Maeyry, Daisuke Miyata, Naofumi Homma, Yuichi Hayashi, Takafumi Aoki

    2018 Joint IEEE International Symposium on Electromagnetic Compatibility & Asia-Pacific Symposium on Electromagnetic Compatibility 1500-1502 2018/05

  73. On masked Galois-field multiplication for authenticated encryption resistant to side channel analysis Peer-reviewed

    Kazuhiro Oshida, Rei Ueno, Naofumi Homma, Takafumi Aoki

    International Workshop on Constructive Side-Channel Analysis and Secure Design 44-60 2018/04

  74. An FPGA accelerator for PatchMatch multi-view stereo using OpenCL Peer-reviewed

    Shunsuke Tatsumi, Masanori Hariyama, Koichi Ito, Takafumi Aoki

    Journal of Real-Time Image Processing 17 (2) 1-13 2018/02/15

    Publisher: Springer Verlag

    DOI: 10.1007/s11554-017-0745-9  

    ISSN: 1861-8200

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    PatchMatch multi-view stereo (MVS) is one method generating depth maps from multi-view images and is expected to be used for various applications such as robot vision, 3D measurement, and 3D reconstruction. The major drawback of PatchMatch MVS is its large computational amount, and its acceleration is strongly desired. However, this acceleration is prevented by two problems. First, though PatchMatch MVS estimates depth maps by propagating estimation results among neighbor pixels, it is not suitable for GPU-based acceleration. Second, since the shape of a matching window used for stereo matching is changed dynamically, reading its pixels is inefficient in memory access. This paper proposes an FPGA accelerator exploiting on-chip FIFOs efficiently to solve the propagation problem. Moreover, reading pixels of a matching window is improved by a cover window which has the fixed shape and covers the matching window. The FPGA accelerator is designed using a design tool based on Open Computing Language (OpenCL). Although parameters of PatchMatch MVS depend on object images, these parameters can be changed easily by the OpenCL-based design. The experimental results demonstrate that the FPGA implementation achieves 3.4 and 2.2 times faster processing speeds than the CPU and GPU ones, respectively, and the power-delay product of the FPGA implementation is 3.2 and 5.7% of the CPU and GPU ones, respectively.

  75. 3D-CNNを用いた脳MRI画像からの年齢推定手法に関する検討

    上田 大, 伊藤 康一, 呉 凱, 佐藤 和則, 瀧 靖之, 福田 寛, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2018 51-51 2018

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2018.0_51  

  76. [Invited Paper] Recent Advances in Biometric Recognition Invited Peer-reviewed

    Koichi Ito, Takafumi Aoki

    ITE Transactions on Media Technology and Applications 6 (1) 64-80 2018

    Publisher: Institute of Image Information and Television Engineers

    DOI: 10.3169/mta.6.64  

    ISSN: 2186-7364

    eISSN: 2186-7364

  77. 畳み込みニューラルネットワークを用いた生体検知手法 Peer-reviewed

    伊藤康一, 岡野健久, 青木孝文

    電子情報通信学会論文誌A J100-A (12) 455-464 2017/12/01

  78. Recent advances in biometrie security: A case study of liveness detection in face recognition Peer-reviewed

    Koichi Ito, Takehisa Okano, Takafumi Aoki

    Proceedings - 9th Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2017 2018-February 220-227 2017/12/01

    DOI: 10.1109/APSIPA.2017.8282031  

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    © 2017 IEEE. Biometrics using biological or behavioral features to authenticate a person has attracted much attention as a new authentication approach against traditional ones such as key, password, etc. Biometrics technologies provide us better security and greater convenience than traditional person authentication technologies such as key, password and card. Biometric systems with cameras involve the risk of spoofing. For example in face recognition systems, when a malicious person turns a printed face photo of an authenticated user to a camera, a face recognition system may accept the malicious person as the authenticated user. To address the above problem, liveness detection is important to develop secure biometric recognition systems. This paper presents a liveness detection method using deep learning for face recognition systems.

  79. A practical person authentication system using second minor finger knuckles for door security Peer-reviewed

    Daichi Kusanagi, Shoichiro Aoyama, Koichi Ito, Takafumi Aoki

    IPSJ Transactions on Computer Vision and Applications 9 (1) 2017/12/01

    Publisher: Springer Berlin Heidelberg

    DOI: 10.1186/s41074-017-0016-5  

    ISSN: 1882-6695

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    This paper proposes a person authentication system using second minor finger knuckles, i.e., metacarpophalangeal (MCP) joints, for door security. This system acquires finger knuckle patterns on MCP joints when a user takes hold of a door handle and recognizes a person using MCP joint patterns. The proposed system can be constructed by attaching a camera onto a door handle to capture MCP joints. Region of interest (ROI) images around each MCP joint can be extracted from only one still image, since all the MCP joints are located on the front face of the camera. Phase-based correspondence matching is used to calculate matching scores between ROIs to take into consideration deformation of ROIs caused by hand pose changes. Through a set of experiments, we demonstrate that the proposed system exhibits the efficient performance of MCP recognition and also show the potential possibilities of second minor finger knuckles for biometric recognition.

  80. Elevation measurement from single-pass SAR images Peer-reviewed

    Shota Hishinuma, Koichi Ito, Takafumi Aoki, Jyunpei Uemoto, Seiho Uratsuka

    International Geoscience and Remote Sensing Symposium (IGARSS) 2017- 5662-5665 2017/12/01

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.1109/IGARSS.2017.8128292  

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    Elevation measurement using Synthetic Aperture Radar (SAR) is one of fundamental techniques in remote sensing. The cross-track Interferometric SAR (InSAR), which is the most popular technique of elevation measurement using SAR, uses the phase differences between the signals received by SAR antennas. Single-pass InSAR can be achieved by a single platform with two antennas. InSAR requires Ground Control Points (GCPs) to measure absolute elevation values, although it is a time-consuming and cost-intensive task to acquire GCPs. Addressing the above problem, this paper proposes an elevation measurement method using two SAR intensity images taken by a single-pass airborne SAR system. A projection model is derived to apply the principle of stereo vision to elevation measurement from SAR images. Phase-Only Correlation is employed to obtain accurate correspondence between two SAR images having below 1-pixel disparities. Through the experiment using SAR images, we demonstrate that the proposed method exhibits efficient performance in elevation measurement.

  81. Brain age estimation from T1-weighted images using effective local features Peer-reviewed

    Ryuichi Fujimoto, Koichi Ito, Kai Wu, Kazunori Sato, Yasuyuki Taki, Hiroshi Fukuda, Takafumi Aoki

    Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 3028-3031 2017/09/13

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.1109/EMBC.2017.8037495  

    ISSN: 1557-170X

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    Statistical analysis using large-scale brain magnetic resonance (MR) image databases has examined that brain tissues have age-related morphological changes. The age of a subject can be estimated from the brain MR image by evaluating morphological changes with healthy aging. This paper proposes an age estimation method using local features of T1-weighted MR images. The brain local features are defined by volumes of brain tissues parcellated into 1,024 local regions defined by the automated anatomical labeling atlas. This paper also proposes the effective local feature selection method to improve the accuracy of age estimation. We evaluate the accuracy of the proposed method using 1,099 T1-weighted images from a Japanese MR image database. We also analyze effectiveness of each local region for age estimation and discuss its medical implication.

  82. A Probe-Camera System for 3D Ultrasound Image Reconstruction Peer-reviewed

    Koichi Ito, Kouya Yodokawa, Takafumi Aoki, Jun Ohmiya, Satoshi Kondo

    Imaging for Patient-Customized Simulations and Systems for Point-of-Care Ultrasound 129-137 2017/09/08

    Publisher: Springer International Publishing

    DOI: 10.1007/978-3-319-67552-7_16  

    ISSN: 0302-9743

    eISSN: 1611-3349

  83. Enhancing Reactive Countermeasure against EM Attacks with Low Overhead Peer-reviewed

    Daisuke Ishihata, Naofumi Homma, Yu-ichi Hayashi, Noriyuki Miura, Daisuke Fujimoto, Makoto Nagata, Takafumi Aoki

    2017 IEEE International Symposium on Electromagnetic Compatibility 399-404 2017/08/09

  84. Automatic Generation System for Multiple-Valued Galois-Field Parallel Multipliers Peer-reviewed

    Rei Ueno, Naofumi Homma, Takafumi Aoki

    IEICE Transactions on Information and Systems E100-D (8) 1603-1610 2017/08

  85. アルツハイマー病のための脳局所特徴量を用いたMR画像解析に関する検討

    藤本 竜一, 伊藤 康一, 呉 凱, 佐藤 和則, 瀧 靖之, 福田 寛, 青木 孝文

    日本医用画像工学会大会予稿集 36回 298-302 2017/07

    Publisher: (一社)日本医用画像工学会

  86. Hierarchical Formal Verification Combining Algebraic Transformation with PPRM Expansion and Its Application to Masked Cryptographic Processors Peer-reviewed

    Rei Ueno, Naofumi Homma, Takafumi Aoki, Sumio Morioka

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E100-A (7) 1396-1408 2017/07

  87. A Systematic Design of Tamper-Resistant Galois-Field Arithmetic Circuits Based on Threshold Implementation with (d+1) Input Shares Peer-reviewed

    Rei Ueno, Naofumi Homma, Takafumi Aoki

    IEEE 47th International Symposium on Multiple-Valued Logic 136-141 2017/05/24

  88. Practical Power Analysis on KCipher-2 Software on Low-End Microcontrollers Peer-reviewed

    Wataru Kawai, Rei Ueno, Naofumi Homma, Takafumi Aoki, Kazuhide Fukushima, Shinsaku Kiyomoto

    IEEE EuroS&P Workshops on Security for Embedded and Mobile Systems 113-121 2017/04/30

  89. Multiple-Valued Debiasing for Physically Unclonable Functions and Its Application to Fuzzy Extractors Peer-reviewed

    Manami Suzuki, Rei Ueno, Naofumi Homma, Takafumi Aoki

    International Workshop on Constructive Side-Channel Analysis and Secure Design 248-263 2017/04/14

  90. Toward More Efficient Tamper-Resistant AES Hardware Architecture Based on Threshold Implementation Peer-reviewed

    Rei Ueno, Naofumi Homma, Takafumi Aoki

    International Workshop on Constructive Side-Channel Analysis and Secure Design 50-64 2017/04/13

  91. Probe localization using structure from motion for 3D ultrasound image reconstruction Peer-reviewed

    Shuya Ito, Koichi Ito, Takafumi Aoki, Jun Ohmiya, Satoshi Kondo

    2017 IEEE 14th International Symposium on Biomedical Imaging (ISBI 2017) 2017/04

    Publisher: IEEE

    DOI: 10.1109/isbi.2017.7950470  

  92. Age estimation from brain MRI images using deep learning Peer-reviewed

    Tzu-Wei Huang, Hwann-Tzong Chen, Ryuichi Fujimoto, Koichi Ito, Kai Wu, Kazunori Sato, Yasuyuki Taki, Hiroshi Fukuda, Takafumi Aoki

    2017 IEEE 14th International Symposium on Biomedical Imaging (ISBI 2017) 2017/04

    Publisher: IEEE

    DOI: 10.1109/isbi.2017.7950650  

    ISSN: 1945-7928

  93. Automatic Generation of Formally-Proven Tamper-Resistant Galois-Field Multipliers Based on Generalized Masking Scheme Peer-reviewed

    Rei Ueno, Naofumi Homma, Sumio Morioka, Takafumi Aoki

    Design, Automation and Test in Europe Conference and Exhibition 2017 978-983 2017/03/29

  94. A 3D Reconstruction Method with Color Reproduction from Multi-band and Multi-view Images Peer-reviewed

    Shuya Ito, Koichi Ito, Takafumi Aoki, Masaru Tsuchida

    Computer Vision – ACCV 2016 Workshops 236-247 2017/03/16

    Publisher: Springer International Publishing

    DOI: 10.1007/978-3-319-54427-4_18  

    ISSN: 0302-9743

    eISSN: 1611-3349

  95. Chosen-Input Side-Channel Analysis on Unrolled Light-Weight Cryptographic Hardware Peer-reviewed

    Ville Yli-Mäyry, Naofumi Homma, Takafumi Aoki

    The 18th International Symposium on Quality Electronic Design 301-306 2017/03/15

  96. Formal Approach for Verifying Galois Field Arithmetic Circuits of Higher Degrees Peer-reviewed

    Rei Ueno, Naofumi Homma, Yukihiro Sugawara, Takafumi Aoki

    IEEE TRANSACTIONS ON COMPUTERS 66 (3) 431-442 2017/03

    DOI: 10.1109/TC.2016.2603979  

    ISSN: 0018-9340

    eISSN: 1557-9956

  97. Power Analysis on Unrolled Architecture with Points-of-Interest Search and Its Application to PRINCE Block Cipher Peer-reviewed

    Ville Yli-Maeyry, Naofumi Homma, Takafumi Aoki

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences Vol.E100-A (1) 149-157 2017/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transfun.E100.A.149  

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    <p>This paper explores the feasibility of power analysis attacks against low-latency block ciphers implemented with unrolled architectures capable of encryption/decryption in a single clock cycle. Unrolled architectures have been expected to be somewhat resistant against side-channel attacks compared to typical loop architectures because of no memory (i.e. register) element storing intermediate results in a synchronous manner. In this paper, we present a systematic method for selecting Points-of-Interest for power analysis on unrolled architectures as well as calculating dynamic power consumption at a target function. Then, we apply the proposed method to PRINCE, which is known as one of the most efficient low-latency ciphers, and evaluate its validity with an experiment using a set of unrolled PRINCE processors implemented on an FPGA. Finally, a countermeasure against such analysis is discussed.</p>

  98. An age estimation method using brain local features of T1-weighted images and its performance evaluation Peer-reviewed

    Ryuichi Fujimoto, Koichi Ito, Kai Wu, Kazunori Sato, Yasuyuki Taki, Hiroshi Fukuda, Takafumi Aoki

    Proceedings of the International Forum on Medical Imaging in Asia 2017 63-66 2017/01/01

  99. Freehand 3D ultrasound volume reconstruction using an accurate probe localization method Peer-reviewed

    Shuya Ito, Koichi Ito, Takafumi Aoki, Jun Ohmiya, Satoshi Kondo

    Proceedings of the International Forum on Medical Imaging in Asia 2017 48-51 2017/01/01

  100. Remote Visualization of Screen Images Using a Pseudo-Antenna That Blends Into the Mobile Environment Peer-reviewed

    Yu-ichi Hayashi, Naofumi Homma, Yohei Toriumi, Kazuhiro Takaya and Takafumi Aoki

    IEEE Transactions on Electromagnetic Compatibility 59 (1) 24-33 2017/01

  101. Efficient Electromagnetic Analysis for Cryptographic Module on the Frequency Domain Peer-reviewed

    Yu-Ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki, Hideaki Sone

    Electronics and Communications in Japan 99 (10) 24-32 2016/10/01

    DOI: 10.1002/ecj.11869  

    ISSN: 1942-9533

    eISSN: 1942-9541

  102. Fundamental Study on a Mechanism of Faulty Outputs from Cryptographic Modules Due to IEMI Peer-reviewed

    Yu ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki, Hideaki Sone

    Electronics and Communications in Japan 99 (9) 72-78 2016/09/01

    DOI: 10.1002/ecj.11855  

    ISSN: 1942-9533

    eISSN: 1942-9541

  103. 災害大国日本における身元確認を考える 歯科医師としての責務とは 大規模災害時における身元確認 歯科界の対応

    佐々木 啓一, 青木 孝文, 鈴木 敏彦, 佐藤 真奈美

    Journal of Oral Biosciences Supplement 2016 144-144 2016/09

    Publisher: (一社)歯科基礎医学会

    ISSN: 2187-2333

    eISSN: 2187-9109

  104. A High Throughput/Gate AES Hardware Architecture by Compressing Encryption and Decryption Datapaths - Toward Efficient CBC-Mode Implementation Peer-reviewed

    Rei Ueno, Sumio Morioka, Naofumi Homma, and Takafumi Aoki

    Proceedings of Conference on Cryptographic Hardware and Embedded Systems 9813 538-558 2016/08

  105. 3D reconstruction of human body using structure from motion for 3D medical imaging Peer-reviewed

    Shuya Ito, Koichi Ito, Takafumi Aoki, Jun Ohmiya and Satoshi Kondo

    Proceedings of 38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society 2016/08

  106. Age estimation using effective brain local features from T1-weighted images Peer-reviewed

    Ryuichi Fujimoto, Chihiro Kondo, Koichi Ito, Kai Wu, Kazunori Sato, Yasuyuki Taki, Hiroshi Fukuda, Takafumi Aoki

    Proceedings of 38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society 5941-5944 2016/08

  107. 口腔癌の頸部リンパ節転移診断における3テスラblack-blood MR imagingの有用性について

    阪本 真弥, 小嶋 郁穂, 飯久保 正弘, 近藤 千裕, 伊藤 康一, 青木 孝文, 小川 武則, 森 士朗, 小玉 哲也, 笹野 高嗣

    歯科放射線 56 (増刊) 70-70 2016/06

    Publisher: (NPO)日本歯科放射線学会

    ISSN: 0389-9705

    eISSN: 2185-6311

  108. Enhancement of Reactive Countermeasure against Side‐Channel Attacks with Microprobing Peer-reviewed

    Daisuke Ishihata, Naofumi Homma, Yu‐ichi Hayashi, Noriyuki Miura,Daisuke Fujimoto, Makoto Nagata, and Takafumi Aoki

    Proceedings of 25th International Workshop on Post-Binary ULSI Systems 2016/05/17

  109. Power Analysis on Unrolled PRINCE Processor and its Countermeasure Peer-reviewed

    Ville Yli‐Mayry, Naofumi Homma, and Takafumi Aoki

    Proceedings of 25th International Workshop on Post-Binary ULSI Systems 2016/05/17

  110. Side channel Security Evaluation for KCipher‐2 Software on Smart Cards Peer-reviewed

    Wataru Kawai, Rei Ueno, Naofumi Homma, Takafumi Aoki, Kazuhide Fukushima, and Shinsaku Kiyomoto

    Proceedings of 25th International Workshop on Post-Binary ULSI Systems 2016/05/17

  111. Formal Design of Pipelined GF Arithmetic Circuits and Its Application to Cryptographic Processors Peer-reviewed

    Rei Ueno, Yukihiro Sugawara, Naofumi Homma, and Takafumi Aoki

    Proceedings of IEEE International Symposium on Multiple-Valued Logic 217-222 2016/05

  112. A High Throughput/Gate AES Hardware Architecture by Compressing Encryption and Decryption Datapaths - Toward Efficient CBC-Mode Implementation.

    Rei Ueno, Sumio Morioka, Naofumi Homma, Takafumi Aoki

    IACR Cryptology ePrint Archive 2016 595-595 2016

  113. The front line of EM information security Peer-reviewed

    Yuichi Hayashi, Naofumi Homma, Takafumi Aoki, Hideaki Sone

    Journal of the Institute of Electronics, Information and Communication Engineers 99 (1) 60-65 2016/01

    ISSN: 0913-5693

  114. A Score Calculation Method Using Positional Information of Feature Points for Biometric Authentication Peer-reviewed

    Koichi Ito, Takafumi Aoki

    2016 23RD INTERNATIONAL CONFERENCE ON PATTERN RECOGNITION (ICPR) 3049-3054 2016

    DOI: 10.1109/ICPR.2016.7900102  

    ISSN: 1051-4651

  115. A Formal Verification Method of Error Correction Code Processors Over Galois-Field Arithmetic Peer-reviewed

    Rei Ueno, Naofumi Homma, and Takafumi Aoki

    Journal of Multiple-Valued Logic and Soft Computing 26 (1月2日) 55-73 2016

  116. 電磁情報セキュリティ研究最前線 Invited Peer-reviewed

    林 優一, 本間 尚文, 青木 孝文, 曽根 秀昭

    電子情報通信学会誌 99 (1) 60-65 2016/01/01

  117. An adherent raindrop detection method using MSER Peer-reviewed

    Koichi Ito, Kazumasa Noro and Takafumi Aoki

    Proceedings of APSIPA Annual Summit and Conference 105-109 2015/12

  118. A high-accuracy ultrasound contrast agent detection method for diagnostic ultrasound imaging systems International-journal Peer-reviewed

    Koichi Ito, Kazumasa Noro, Yukari Yanagisawa, Maya Sakamoto, Shiro Mori, Kiyoto Shiga, Tetsuya Kodama and Takafumi Aoki

    Ultrasound in Medicine & Biology 41 (12) 3120-3130 2015/12

    DOI: 10.1016/j.ultrasmedbio.2015.07.032  

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    An accurate method for detecting contrast agents using diagnostic ultrasound imaging systems is proposed. Contrast agents, such as microbubbles, passing through a blood vessel during ultrasound imaging are detected as blinking signals in the temporal axis, because their intensity value is constantly in motion. Ultrasound contrast agents are detected by evaluating the intensity variation of a pixel in the temporal axis. Conventional methods are based on simple subtraction of ultrasound images to detect ultrasound contrast agents. Even if the subject moves only slightly, a conventional detection method will introduce significant error. In contrast, the proposed technique employs spatiotemporal analysis of the pixel intensity variation over several frames. Experiments visualizing blood vessels in the mouse tail illustrated that the proposed method performs efficiently compared with conventional approaches. We also report that the new technique is useful for observing temporal changes in microvessel density in subiliac lymph nodes containing tumors. The results are compared with those of contrast-enhanced computed tomography.

  119. 回折格子レーザによる能動型3次元計測を用いた幾何補正手法と掌紋認証への応用 Peer-reviewed

    佐藤拓杜, 青山章一郎, 酒井修二, 遊佐秀作, 伊藤康一, 青木孝文

    映像情報メディア学会誌 69 (9) J261-J270 2015/12

  120. A person authentication system using second minor finger knuckles for door handle Peer-reviewed

    Daichi Kusanagi, Shoichiro Aoyama, Koichi Ito and Takafumi Aoki

    Proceedings of Asian Conference on Pattern Recognition (OS9-01) 2015/11

  121. An extension of PatchMatch stereo for 3D reconstruction from multi-view images Peer-reviewed

    Mutsuki Hiradate, Koichi Ito, Takafumi Aoki, Takafumi Watanabe and Hiroki Unten

    Proceedings of Asian Conference on Pattern Recognition (PS1-02) 2015/11

  122. Disaster Victim Identification and ICT Invited Peer-reviewed

    AOKI Takafumi, ITO Koichi, AOYAMA Shoichiro

    IEICE Fundamentals Review 9 (2) 119-130 2015/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/essfr.9.2_119  

    ISSN: 1882-0875

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    This paper presents basic methods of victim identification applied in the Great East Japan Earthquake and Tsunami on March 11, 2011. It was proved in this disaster that human identification using dental treatment records is particularly effective compared with other forensic human identification techniques including those using faces, fingerprints, palmprints, and DNA. However, a major problem at the time of the disaster was that the Japanese police agency did not have sufficient expertise in dental identification, especially in mass fatality situations. In April 2011, the authors' group joined the victim identification team of Miyagi Prefectural Police to introduce advanced dental identification techniques with the necessary ICT support. We designed and implemented the overall workflow of dental identification in collaboration with Miyagi Dental Association. The main objective of this paper is to share the lessons learned from the disaster. We also review a recent project conducted by the Ministry of Health, Labour and Welfare (MHLW) for disaster preparedness; the project is to define a standard data set for forensic dentistry in order to achieve rapid human identification.

  123. Phase-based window matching with geometric correction for multi-view stereo Peer-reviewed

    Shuji Sakai, Koichi Ito, Takafumi Aoki, Takafumi Watanabe and Hiroki Unten

    IEICE Transactions on Information and Systems E98-D (10) 1818-1828 2015/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transinf.2014EDP7409  

    ISSN: 0916-8532

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    Methods of window matching to estimate 3D points are the most serious factors affecting the accuracy, robustness, and computational cost of Multi-View Stereo (MVS) algorithms. Most existing MVS algorithms employ window matching based on Normalized Cross-Correlation (NCC) to estimate the depth of a 3D point. NCC-based window matching estimates the displacement between matching windows with sub-pixel accuracy by linear/cubic interpolation, which does not represent accurate sub-pixel values of matching windows. This paper proposes a technique of window matching that is very accurate using Phase-Only Correlation (POC) with geometric correction for MVS. The accurate sub-pixel displacement between two matching windows can be estimated by fitting the analytical correlation peak model of the POC function. The proposed method also corrects the geometric transformations of matching windows by taking into consideration the 3D shape of a target object. The use of the proposed geometric correction approach makes it possible to achieve accurate 3D reconstruction from multi-view images even for images with large transformations. The proposed method demonstrates more accurate 3D reconstruction from multi-view images than the conventional methods in a set of experiments.

  124. A silicon-level countermeasure against fault sensitivity analysis and its evaluation Peer-reviewed

    Sho Endo, Yang Li, Naofumi Homma, Kazuo Sakiyama, Kazuo Ohta, Daisuke Fujimoto

    IEEE Transactions on Very Large Scale Integration Systems 23 (8) 1429-1438 2015/10

  125. Efficient electromagnetic analysis for cryptographic module on the frequency domain

    Yu-Ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki, Hideaki Sone

    IEEJ Transactions on Fundamentals and Materials 135 (9) 515-521 2015/09/01

    Publisher: Institute of Electrical Engineers of Japan

    DOI: 10.1541/ieejfms.135.515  

    ISSN: 1347-5533 0385-4205

  126. Stereo radargrammetry using airborne SAR images without GCP Peer-reviewed

    Daiki Maruki, Shuji Sakai, Koichi Ito, Takafumi Aoki, Jyunpei Uemoto and Seiho Uratsuka

    Proceedings of IEEE International Conference on Image Processing (COI-P2.5) 1-5 2015/09

  127. Score level fusion of multibiometrics using local phase array Peer-reviewed

    Luis Rafael Marval Perez, Shoichiro Aoyama, Koichi Ito and Takafumi Aoki

    Lecture Notes in Computer Science (Pacific-Rim Conference on Multimedia) 9315 215-224 2015/09

  128. Buffer overflow attack with multiple fault injection and a proven countermeasure Peer-reviewed

    Shoei Nashimoto, Naofumi Homma, Yu-Ichi Hayashi and Takafumi Aoki

    Proceedings of PROOFS (Security Proofs for Embedded Systems) Workshop 2015/09

  129. Highly efficient GF(2^8) inversion circuit based on redundant GF arithmetic and its application to AES design Peer-reviewed

    Rei Ueno, Naofumi Homma, Yukihiro Sugawara, Yasuyuki Nogami and Takafumi Aoki

    Lecture Notes in Computer Science (Cryptographic Hardware and Embedded Systems) 9293 63-80 2015/09

    Publisher: Springer

    DOI: 10.1007/978-3-662-48324-4_4  

  130. Improved Power Analysis on Unrolled Architecture and Its Application to PRINCE Block Cipher Peer-reviewed

    Ville Yli-M?yry, Naofumi Homma and Takafumi Aoki

    Lecture Notes in Computer Science (International Workshop on Lightweight Cryptography for Security & Privacy) 9542 148-163 2015/09

  131. Stereo radargrammetry using Airborne SAR images with parameter optimization Peer-reviewed

    Daiki Maruki, Shuji Sakai, Koichi Ito, Takafumi Aoki, Jyunpei Uemoto and Seiho Uratsuka

    Proceedings of Asia-Pacific Conference on Synthetic Aperture Radar 258-263 2015/09

  132. 周波数領域における暗号モジュールに対する電磁波解析の効率化 Peer-reviewed

    林優一, 本間尚文, 水木敬明, 青木孝文, 曽根秀昭

    電気学会論文誌A 135 (9) 515-521 2015/09

  133. Age estimation method using brain local features for T1-weighted images Peer-reviewed

    Chihiro Kondo, Koichi Ito, Kai Wu, Kazunori Sato, Yasuyuki Taki, Hiroshi Fukuda and Takafumi Aoki

    Proceedings of Annual International Conference of the IEEE Engineering in Medicine and Biology Society 666-669 2015/08

  134. Detection method for overclocking by intentional electromagnetic interference Peer-reviewed

    Atsushi Nagao, Yuichiro Okugawa, Kazuhiro Takaya, Yu-ichi Hayashi, Naofumi Homma and Takafumi Aoki

    Proceedings of International Symposium on Electromagnetic Compatibility and EMC Europe 241-245 2015/08

  135. Method for estimating fault injection time on cryptographic devices from EM leakage Peer-reviewed

    Ko Nakamura, Yu-ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki and Hideaki Sone

    Proceedings of International Symposium on Electromagnetic Compatibility and EMC Europe 235-240 2015/08

  136. OpenCL-based design of an FPGA accelerator for phase-based correspondence matching Peer-reviewed

    Shunsuke Tatsumi, Masanori Hariyama, Mamoru Miura, Koichi Ito and Takafumi Aoki

    Proceedings of International Conference on Parallel and Distributed Processing Techniques and Applications 1 90-95 2015/06

  137. EM attack sensor: concept, circuit, and design-automation methodology Peer-reviewed

    Noriyuki Miura, Naofumi Homma, Yuichi Hayashi, Takafumi Aoki, Daisuke Fujimoto and Makoto Nagata

    Proceedings of Design Automation Conference (176) 1-6 2015/06

  138. Electromagnetic analysis against public-key cryptographic software on embedded OS Peer-reviewed

    Hajime Uno, Sho Endo Naofumi Homma, Yu-ichi Hayashi and Takafumi Aoki

    IEICE Transactions on Communications E98-B (7) 1242-1249 2015/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transcom.E98.B.1242  

    ISSN: 0916-8516

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    Electromagnetic analysis (EMA) against public-key cryptographic software on an embedded OS is presented in this paper. First, we propose a method for finding an observation point for EMA, where the EM radiation caused by cryptographic operations can be observed with low noise. The basic idea is to find specific EM radiation patterns produced by cryptographic operations given specific input pattern. During the operations, we scan the surface of the target device(s) with a micro magnetic probe. The scan is optimized in advanced using another compatible device that has the same central processing unit (CPU) and OS as the target device. We demonstrate the validity of the proposed EMAs through some EMA experiments with two types of RSA software on an embedded OS platform. The two types of RSA software have different implementations for modular multiplication algorithms: one is a typical and ready-made implementation using BigInteger class on Java standard library, and another is a custom-made implementation based on the Montgomery multiplication algorithm. We conduct experiments of chosen-message EMA using our scanning method, and show such EMAs successfully reveal the secret key of RSA software even under the noisy condition of the embedded OS platform. We also discuss some countermeasures against the above EMAs.

  139. Fundamental study on fault occurrence mechanisms by intentional electromagnetic interference using impulses Peer-reviewed

    Yu-Ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki, Hideaki Sone

    2015 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2015 2015 (SS13-1.4) 585-588 2015/05/29

    DOI: 10.1109/APEMC.2015.7175288  

    ISSN: 2162-7673

  140. Fundamental study on a mechanism of faulty outputs from cryptographic modules due to IEMI

    Yu-Ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki, Hideaki Sone

    IEEJ Transactions on Fundamentals and Materials 135 (5) 276-281 2015/05/01

    Publisher: Institute of Electrical Engineers of Japan

    DOI: 10.1541/ieejfms.135.276  

    ISSN: 1347-5533 0385-4205

  141. 暗号モジュールに対する意図的な電磁妨害による故障発生メカニズムに関する基礎的検討 Peer-reviewed

    林優一, 本間尚文, 水木敬明, 青木孝文, 曽根秀昭

    電気学会論文誌A 135 (5) 276-281 2015/05

  142. System for automatic generation of parallel multipliers over Galois field Peer-reviewed

    Yukihiro Sugawara, Rei Ueno, Naofumi Homma, and Takafumi Aoki

    Proceedings of International Symposium on Multiple-Valued Logic 55-59 2015/03

  143. Formal design of Galois-field arithmetic circuits based on polynomial ring representation Peer-reviewed

    Rei Ueno, Naofumi Homma, Yukihisa Sugawara and Takafumi Aoki

    Proceedings of International Symposium on Multiple-Valued Logic 48-53 2015/03

  144. Highly Efficient GF(28) Inversion Circuit Based on Redundant GF Arithmetic and Its Application to AES Design.

    Rei Ueno, Naofumi Homma, Yukihiro Sugawara, Yasuyuki Nogami, Takafumi Aoki

    IACR Cryptol. ePrint Arch. 2015 763-763 2015

  145. Multi-view stereo using phase-only correlation for 3D reconstruction and its application to e-Heritage Peer-reviewed

    Shuji Sakai, Koichi Ito, Takafumi Aoki, Takafumi Watanabe and Hiroki Unten

    Proceedings of International Conference on Advanced Imaging (T504-02) 242-247 2015/01

  146. Palm region extraction for contactless palmprint recognition Peer-reviewed

    Koichi Ito, Takuto Sato, Shoichiro Aoyama, Shuji Sakai, Shusaku Yusa and Takafumi Aoki

    Proceedings of International Conference on Biometrics 334-340 2015/01

  147. A DPA/DEMA/LEMA-resistant AES crypto-graphic processor with supply-current equalizer and micro EM probe sensor Peer-reviewed

    Daisuke Fujimoto, Noriyuki Miura, Yu-ichi Hayashi, Naofumi Homma, Takafumi Aoki and Makoto Nagata

    Proceedings of Asia and South Pacific Design Automation Conference 26-27 2015/01

  148. A sequential online 3D reconstruction system using dense stereo matching Peer-reviewed

    Sosuke Yamao, Mamoru Miura, Shuji Sakai, Koichi Ito and Takafumi Aoki

    Proceedings of IEEE Winter Conference on Applications of Computer Vision 341-348 2015/01

  149. 基線長が短い車載ステレオカメラのための障害物検出手法 Peer-reviewed

    和泉圭祐, 三浦衛, 伊藤康一, 青木孝文

    電子情報通信学会論文誌A J98-A (1) 165-175 2015/01

  150. Efficient DFA on SPN-based block ciphers and its application to the LED block cipher Peer-reviewed

    Rei Ueno, Naofumi Homma and Takafumi Aoki

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E98-A (1) 182-191 2015/01

  151. An adaptive multiple-fault injection attack on microcontrollers and a countermeasure Peer-reviewed

    Sho Endo, Naofumi Homma, Yu-ichi Hayashi, Junko Takahashi, Hitoshi Fuji and Takafumi Aoki

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E98-A (1) 171-181 2015/01

  152. Design methodology and validity verification for a reactive countermeasure against EM attacks Peer-reviewed

    Naofumi Homma, Yu-ichi Hayashi, Noriyuki Miura, Daisuke Fujimoto, Makoto Nagata and Takafumi Aoki

    Journal of Cryptology 1-19 2015

  153. A formal approach to designing multiple-valued arithmetic circuits Peer-reviewed

    Kazuya Saito, Naofumi Homma, and Takafumi Aoki

    Journal of Multiple-Valued Logic and Soft Computing 24 (1月4日) 21-34 2015

  154. Correlation power analysis using bit-level biased activity plaintexts against AES cores with countermeasures

    Daisuke Fujimoto, Noriyuki Miura, Makoto Nagata, Yuichi Hayashi, Naofumi Homma, Takafumi Aoki, Yohei Hori, Toshihiro Katashita, Kazuo Sakiyama, Thanh-Ha Le, Julien Bringer, Pirouz Bazargan-Sabet, Shivam Bhasin, Jean-Luc Danger

    IEEE International Symposium on Electromagnetic Compatibility 2014- 306-309 2014/12/23

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    ISSN: 2158-1118 1077-4076

  155. Detecting contrast agents in ultrasound image sequences for tumor diagnosis Peer-reviewed

    Kazumasa Noro, Koichi Ito, Yukari Yanagisawa, Maya Sakamoto, Shiro Mori, Kiyoto Shiga, Tetsuya Kodama and Takafumi Aoki

    Proceedings of APSIPA Annual Summit and Conference TP1-3-4 1-6 2014/12

  156. A threat for tablet PCs in public space: Remote visualization of screen images using EM emanation Peer-reviewed

    Yu-ichi Hayashi, Naofumi Homma, Mamoru Miura, Takafumi Aoki and Hideaki Sone

    Proceedings of 21st ACM Conference on Computer and Communications Security (CCS) 954-965 2014/11

  157. Efficient POC-based correspondence detection method for multi-channel images Peer-reviewed

    Masaru Tsuchida, Shuji Sakai, Koichi Ito, Kunio Kashino, Junji Yamato, and Takafumi Aoki

    Proceedings of 22nd Color and Imaging Conference 2014-January (January) 113-118 2014/11

    ISSN: 2166-9635

    eISSN: 2169-2629

  158. Toward formal design of practical cryptographic hardware based on Galois field arithmetic Peer-reviewed

    Naofumi Homma, Kazuya Saito, and Takafumi Aoki

    IEEE Transactions on Computers 63 (10) 2604-2613 2014/10

  159. Multi-finger knuckle recognition from video sequence: Extracting accurate multiple finger knuckle regions Peer-reviewed

    Daichi Kusanagi, Shoichiro Aoyama, Koichi Ito and Takafumi Aoki

    Proceedings of International Joint Conference on Biometrics 2014/09

  160. EM attack is non-invasive? - Design methodology and validity verification of EM attack sensor Peer-reviewed

    Naofumi Homma, Yu-ichi Hayashi, Noriyuki Miura, Daisuke Fujimoto, Daichi Tanaka, Makoto Nagata and Takafumi Aoki

    Lecture Notes in Computer Science (Cryptographic Hardware and Embedded Systems) 8731 1-16 2014/09

  161. Formal design of arithmetic circuits over Galois fields based on normal basis representations Peer-reviewed

    Kotaro Okamoto, Naofumi Homma, and Takafumi Aoki

    IEICE Transactions on Information and Systems E97-D (9) 2270-2277 2014/09

  162. Precisely Timed IEMI Fault Injection Synchronized with EM Information Leakage Peer-reviewed

    Yuichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki, and Hideaki Sone

    IEEE EMC 2014 (TH-AM-3-1) 2014/08/07

  163. Integrated-circuit countermeasures against information leakage through EM radiation Peer-reviewed

    Noriyuki Miura, Daisuke Fujimoto, Yu-ichi Hayashi, Naofumi Homma, Takafumi Aoki and Makoto Nagata

    Proceedings of IEEE International Symposium on Electromagnetic Compatibility 748-751 2014/08

  164. Precisely timed IEMI fault injection synchronized with EM information leakage Peer-reviewed

    Yu-ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki and Hideaki Sone

    Proceedings of IEEE International Symposium on Electromagnetic Compatibility 738-742 2014/08

  165. Performance improvement of phase-based correspondence matching for palmprint recognition Peer-reviewed

    Vincent Roux, Shoichiro Aoyama, Koichi Ito and Takafumi Aoki

    Proceedings of IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshop 70-77 2014/06

  166. A local EM-analysis attack resistant cryptographic engine with fully-digital oscillator-based tamper-access sensor Peer-reviewed

    Noriyuki Miura, Daisuke Fujimoto, Daichi Tanaka, Yu-ichi Hayashi, Naofumi Homma, Takafumi Aoki and Makoto Nagata

    Symposium on VLSI Circuits, Digest of Technical Papers 172-173 2014/06

  167. A finger-knuckle-print recognition algorithm using phase-based local block matching Peer-reviewed

    Shoichiro Aoyama, Koichi Ito and Takafumi Aoki

    Information Sciences 268 53-64 2014/06

  168. An efficient approach to verifying Galois-field arithmetic circuits of higher degrees and its application to ECC decoders Peer-reviewed

    Rei Ueno, Kotaro Okamoto, Naofumi Homma and Takafumi Aoki

    Proceedings of IEEE 44th International Symposium on Multiple-Valued Logic 144-149 2014/05

  169. Chosen-message electromagnetic analysis against cryptographic software on embedded OS Peer-reviewed

    Hajime Uno, Sho Endo, Yu-ichi Hayashi, Naofumi Homma and Takafumi Aoki

    Proceedings of International Symposium on Electromagnetic Compatibility 313-316 2014/05

  170. Efficient method for estimating propagation area of information leakage via EM field Peer-reviewed

    Yu-ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki and Hideaki Sone

    Proceedings of International Symposium on Electromagnetic Compatibility 298-301 2014/04

  171. A hierarchical formal approach to verifying side-channel resistant cryptographic processors Peer-reviewed

    Kotaro Okamoto, Naofumi Homma, Takafumi Aoki and Sumio Morioka

    Proceedings of IEEE International Symposium on Hardware-Oriented Security and Trust 76-79 2014/04

  172. A multiple-fault injection attack by adaptive timing control under black-box conditions and a countermeasure Peer-reviewed

    Sho Endo, Naofumi Homma, Yu-ichi Hayashi, Junko Takahashi, Hitoshi Fuji and Takafumi Aoki

    Lecture Notes in Computer Science (International Workshop on Constructive Side-Channel Analysis and Secure Design) 8622 214-228 2014/04

  173. Power noise measurements of cryptographic VLSI circuits regarding side-channel information leakage Peer-reviewed

    Daisuke Fujimoto, Noriyuki Miura, Makoto Nagata, Yuichi Hayashi, Naofumi Homma, Takafumi Aoki, Yohei Hori, Toshihiro Katashita, Kazuo Sakiyama, Thanh-Ha Le, Julien Bringer, Pirouz Bazargan-Sabet, Shivam Bhasin and Jean-Luc Danger

    IEICE Transactions on Electronics E97-C (4) 272-279 2014/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transele.E97.C.272  

    ISSN: 0916-8524

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    Power supply noise waveforms within cryptographic VLSI circuits in a 65nm CMOS technology are captured by using an on-chip voltage waveform monitor (OCM). The waveforms exhibit the correlation of dynamic voltage drops to internal logical activities during Advance Encryption Standard (AES) processing, and causes side-channel information leakage regarding to secret key bytes. Correlation Power Analysis (CPA) is the method of an attack extracting such information leakage from the waveforms. The frequency components of power supply noise contributing the leakage are shown to be localized in an extremely low frequency region. The level of information leakage is strongly associated with the size of increment of dynamic voltage drops against the Hamming distance in the AES processing. The time window of significant importance where the leakage most likely happens is clearly designated within a single clock cycle in the final stage of AES processing. The on-chip power supply noise measurements unveil the facts about side-channel information leakage behind the traditional CPA with on-board sensing of power supply current through a resistor of 1 ohm.

  174. Three-dimensional Shape Measurement Using Two Snapshots From a Moving Digital Camera Peer-reviewed

    Miura Mamoru, Sakai Shuji, Ishii Jumpei, Yamao Sosuke, Ito Koichi, Aoki Takafumi

    The Journal of the Institute of Television Engineers of Japan 68 (4) J135-J143 2014/04

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.3169/itej.68.J135  

    ISSN: 1342-6907

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    A method is presented for measuring accurate and dense 3D shapes of an object from two views captured with a moving consumer digital camera. Since existing 3D measurement systems require special and expensive measurement equipment such as laser scanners or technical knowledge such as camera calibration, it is difficult for ordinary consumers to use existing systems practically in their daily life. An easy-to-use 3D measurement system was achieved by using a Structure from Motion algorithm based on feature matching to estimate camera parameters and area-based matching to determine an accurate and dense correspondence. Experiments demonstrated that the proposed method makes it possible to measure a 3D shape with accuracy comparable to that of a laser scanner.

  175. What is the role of universities in disaster response, recovery, and rehabilitation? Focusing on our disaster victim identification project Peer-reviewed

    Takafumi Aoki and Koichi Ito

    IEEE Communications Magazine 52 (3) 30-37 2014/03

  176. Practical DFA strategy for AES under limited-access conditions Peer-reviewed

    Kazuo Sakiyama, Yang Li, Shigeto Gomisawa, Yu-ichi Hayashi, Mitsugu Iwamoto, Naofumi Homma, Takafumi Aoki and Kazuo Ohta

    Practical DFA strategy for AES under limited-access conditions 22 (2) 142-151 2014/02

  177. 脳MRI画像の局所特徴量に基づく年齢推定手法の検討

    近藤 千裕, 伊藤 康一, 呉 凱, 佐藤 和則, 瀧 靖之, 福田 寛, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2014 208-208 2014

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2014.0_208  

  178. Correlation Power Analysis using Bit-Level Biased Activity Plaintexts against AES Cores with Countermeasures Peer-reviewed

    Daisuke Fujimoto, Noriyuki Miura, Makoto Nagata, Yuichi Hayashi, Naofumi Homma, Takafumi Aoki, Yohei Hori, Toshihiro Katashita, Kazuo Sakiyama, Thanh-Ha Le, Julien Bringer, Pirouz Bazargan-Sabet, Shivam Bhasin, Jean-Luc Danger

    2014 INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, TOKYO (EMC'14/TOKYO) #14P2-A3 306-309 2014

    ISSN: 2158-110X

  179. Chosen-IV correlation power analysis on KCipher-2 hardware and a masking-based countermeasure Peer-reviewed

    Takafumi Hibiki, Naofumi Homma, Yuto Nakano, Kazuhide Fukushima, Shinsaku Kiyomoto, Yutaka Miyake and Takafumi Aoki

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E97-A (1) 157-166 2014/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transfun.E97.A.157  

    ISSN: 0916-8508

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    This paper presents a chosen-IV (Initial Vector) correlation power analysis on the international standard stream cipher KCipher-2 together with an effective countermeasure. First, we describe a power analysis technique which can reveal the secret key (initial key) of KCipher-2 and then evaluate the validity of the CPA with experiments using both FPGA and ASIC implementations of KCipher-2 processors. This paper also proposes a masking-based countermeasure against the CPA. The concept of the proposed countermeasure is to mask intermediate data which pass through the non-linear function part including integer addition, substitution functions, and internal registers L1 and L2. We design two types of masked integer adders and two types of masked substitution circuits in order to minimize circuit area and delay, respectively. The effectiveness of the countermeasure is demonstrated through an experiment on the same FPGA platform. The performance of the proposed method is evaluated through the ASIC fabricated by TSMC 65nm CMOS process technology. In comparison with the conventional design, the design with the countermeasure can be achieved by the area increase of 1.6 times at most.

  180. Image-based magnification calibration for electron microscope Peer-reviewed

    Koichi Ito, Ayako Suzuki, Takafumi Aoki and Ruriko Tsuneta

    Machine Vision and Applications 25 (1) 185-197 2014/01

  181. Transient analysis of EM radiation associated with information leakage from cryptographic Ics Peer-reviewed

    Yu-ichi Hayashi, Naofumi Homma, Takafumi Aoki, Yuichiro Okugawa, and Yoshiharu Akiyama

    The 9th International Workshop on Electromagnetic Compatibility of Integrated Circuits 78-82 2013/12

  182. A Finger-Knuckle-Print Recognition Algorithm Robust against Deformation of Finger-Knuckle-Print Images Peer-reviewed

    AOYAMA Shoichiro, ITO Koichi, AOKI Takafumi

    The Transactions of the Institute of Electronics, Information and Communication Engineers. A J96-A (12) 790-800 2013/12

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5707

  183. Generating robust and stable disparity map using phase-based correspondence matching from stereo video sequence Peer-reviewed

    Koichi Ito, Mitsuharu Sasaki, Takafumi Aoki, Tomohide Ishigami and Akio Nishimura

    Proceedings of Asian Conference on Pattern Recognition 586-590 2013/11

  184. A contactless palm recognition system using simple active 3D measurement with diffraction grating laser Peer-reviewed

    Takuto Sato, Shoichiro Aoyama, Shuji Sakai, Shusaku Yusa, Koichi Ito and Takafumi Aoki

    Proceedings of Asian Conference on Pattern Recognition 542-546 2013/11

  185. Phase-based image matching and its application to biometric recognition Peer-reviewed

    Koichi Ito and Takafumi Aoki

    Proceedings of APSIPA Annual Summit and Conference (OS.3-IVM.3-4) 1-7 2013/10

  186. Yet another fault-based leakage in non-uniform faulty ciphertexts Peer-reviewed

    Yang Li, Yu-Ichi Hayashi, Arisa Matsubara, Naofumi Homma, Takafumi Aoki, Kazuo Ohta and Kazuo Sakiyama

    Lecture Notes in Computer Science (The 6th International Symposium on Foundations & Practice of Security) 8352 272-290 2013/10

  187. A multi-finger knuckle recognition system for door handle Peer-reviewed

    Shoichiro Aoyama, Koichi Ito and Takafumi Aoki

    Proceedings of the IEEE 6th International Conference on Biometrics: Theory, Applications and Systems 2013/09

  188. 3D reconstruction of urban environments using in-vehicle fisheye camera Peer-reviewed

    Jumpei Ishii, Shuji Sakai, Koichi Ito, Takafumi Aoki, Takura Yanagi and Toshiyuki Ando

    Proceedings of International Conference on Image Processing 2145-2148 2013/09

  189. Stereo one-shot six-band camera system for accurate color reproduction Peer-reviewed

    Masaru Tsuchida, Shuji Sakai, Mamoru Miura, Koichi Ito, Takahito Kawanishi, Kunio Kashino, Junji Yamato and Takafumi Aoki

    Journal of Electronic Imaging 23 (3) 033025-1-033025-12 2013/09

    DOI: 10.1117/1.JEI.22.3.033025  

  190. A hierarchical graph-based approach to generating formally-proofed Galois-field multipliers Peer-reviewed

    Kotaro Okamoto, Naofumi Homma and Takafumi Aoki

    Proceedings of 2013 PROOFS (Security Proofs for Embedded Systems) Workshop 98-109 2013/08

  191. Performance evaluation of phase-based correspondence matching on GPUs Peer-reviewed

    Mamoru Miura, Kinya Fudano, Koichi Ito, Takafumi Aoki, Hiroyuki Takizawa and Hiroaki Kobayashi

    Proceedings of SPIE Applications of Digital Image Processing XXXVI 98-109 2013/08

  192. Map-based analysis of IEMI fault injection into cryptographic devices Peer-reviewed

    Yu-ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki and Hideaki Sone

    IEEE International Symposium on Electromagnetic Compatibility 829-833 2013/08

  193. Disaster victim identification using dental records --- Experience of the Grate East Japan Earthquake --- Peer-reviewed

    Takafumi Aoki, Koichi Ito, Shoichiro Aoyama and Eiko Kosuge

    Proceedings of IEEE Region 10 Humanitarian Technology Conference 2013 63-68 2013/08

  194. Analysis of electromagnetic information leakage from cryptographic devices with different physical structures Peer-reviewed

    Yuichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki, Hideaki Sone, Laurent Sauvage and Jean-Luc Danger

    IEEE Transactions on Electromagnetic Compatibility 55 (3) 571-580 2013/06

  195. Efficient evaluation of EM radiation associated with information leakage from cryptographic devices, Peer-reviewed

    Yuichi Hayashi, Naofumi Homma, Takaaki Mizuki, Haruki Shimada, Takafumi Aoki, Hideaki Sone, Laurent Sauvage and Jean-Luc Danger

    IEEE Transactions on Electromagnetic Compatibility 55 (3) 555-563 2013/06

  196. A Contactless Palmprint Authentication Algorithm for Mobile Phones Peer-reviewed

    AOYAMA Shoichiro, ITO Koichi, AOKI Takafumi, OTA Haruki

    The Transactions of the Institute of Electronics, Information and Communication Engineers. A J96-A (5) 250-263 2013/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5707

  197. Efficient Safety Evaluation of EM Information Leakage Using a Selected-Data Set Peer-reviewed

    SHIMADA Haruki, HAYASHI Yu-ichi, HOMMA Naofumi, MIZUKI Takaaki, AOKI Takafumi, SONE Hideaki

    The transactions of the Institute of Electronics, Information and Communication Engineers. B J96-B (4) 467-475 2013/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1344-4697

  198. Fast and robust correspondence matching and its application to volume registration Peer-reviewed

    Yuichiro Tajima, Kinya Fudano, Koichi Ito and Takafumi Aoki

    IEICE Transactions on Information and systems E96-D (4) 826-835 2013/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transinf.E96.D.826  

    ISSN: 0916-8532

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    This paper presents a fast and accurate volume correspondence matching method using 3D Phase-Only Correlation (POC). The proposed method employs (i) a coarse-to-fine strategy using multi-scale volume pyramids for correspondence search and (ii) high-accuracy POC-based local block matching for finding dense volume correspondence with sub-voxel displacement accuracy. This paper also proposes its GPU implementation to achieve fast and practical computation of volume registration. Experimental evaluation shows that the proposed approach exhibits higher accuracy and lower computational cost compared with conventional method. We also demonstrate that the GPU implementation of the proposed method can align two volume data in several seconds, which is suitable for practical use in the image-guided radiation therapy.

  199. Implementation and evaluation of a remote authentication system using touchless palmprint recognition Peer-reviewed

    Haruki Ota, Shoichiro Aoyama, Ryu Watanabe, Koichi Ito, Yutaka Miyake and Takafumi Aoki

    Multimedia Systems 19 (2) 117-129 2013/03

  200. Transient IEMI threats for cryptographic devices Peer-reviewed

    Yuichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki and Hideaki Sone

    IEEE Transactions on Electromagnetic Compatibility 55 (1) 140-148 2013/02

  201. Similarity measure using local phase features and its application to biometric recognition Peer-reviewed

    Shoichiro AoyamA, Koichi Ito, Takafumi Aoki

    IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshops 180-187 2013

    DOI: 10.1109/CVPRW.2013.34  

    ISSN: 2160-7508 2160-7516

  202. An efficient image matching method for multi-view stereo Peer-reviewed

    Shuji Sakai, Koichi Ito, Takafumi Aoki, Tomohito Masuda, Hiroki Unten

    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 7727 (4) 283-296 2013

    DOI: 10.1007/978-3-642-37447-0_22  

    ISSN: 0302-9743 1611-3349

  203. Electromagnetic information leakage from cryptographic devices

    Naofumi Homma, Yu-Ichi Hayashi, Takafumi Aoki

    IEEE International Symposium on Electromagnetic Compatibility 401-404 2013

    ISSN: 1077-4076 2158-1118

  204. Chosen-IV Correlation Power Analysis on KCipher-2 and a Countermeasure.

    Takafumi Hibiki, Naofumi Homma, Yuto Nakano, Kazuhide Fukushima, Shinsaku Kiyomoto, Yutaka Miyake, Takafumi Aoki

    Constructive Side-Channel Analysis and Secure Design - 4th International Workshop(COSADE) 169-183 2013

    Publisher: Springer

    DOI: 10.1007/978-3-642-40026-1_11  

  205. Exploring the relations between fault sensitivity and power consumption Peer-reviewed

    Yang Li, Sho Endo, Nicolas Debande, Naofumi Homma, Takafumi Aoki, Thanh-Ha Le, Jean-Luc Danger, Kazuo Ohta, Kazuo Sakiyama

    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 7864 (Springer-Verlag) 137-153 2013

    DOI: 10.1007/978-3-642-40026-1-9  

    ISSN: 0302-9743 1611-3349

  206. Disaster victim identification using dental records - Experience of the Great East Japan Earthquake Peer-reviewed

    Takafumi Aoki, Koichi Ito, Shoichiro Aoyama, Eiko Kosuge

    2013 IEEE Region 10 Humanitarian Technology Conference, R10-HTC 2013 57-62 2013

    DOI: 10.1109/R10-HTC.2013.6669014  

  207. A stereo six-band motion picture capturing using 4K digital cinema camera Peer-reviewed

    Masaru Tsuchida, Shuji Sakai, Koichi Ito, Ryo Mukai, Kunio Kashino, Junji Yamato, Takafumi Aoki

    ACM SIGGRAPH 2013 Posters, SIGGRAPH 2013 Poster 56 2013

    DOI: 10.1145/2503385.2503447  

  208. Performance Improvement of Face Recognition Algorithms Using Occluded-Region Detection Peer-reviewed

    Yuichiro Tajima, Koichi Ito, Takafumi Aoki, Tomoki Hosoi, Sei Nagashima, Koji Kobayashi

    2013 INTERNATIONAL CONFERENCE ON BIOMETRICS (ICB) 2013

    DOI: 10.1109/ICB.2013.6613012  

    ISSN: 2376-4201

  209. A stereo six-band video camera system for accurate color reproduction Peer-reviewed

    Masaru Tsuchida, Shuji Sakai, Mamoru Miura, Koichi Ito, Takahito Kawanishi, Kunio Kashino, Junji Yamato and Takafumi Aoki

    Proceedings of 20th Color and Imaging Conference 117-122 2012/12

  210. Security evaluation of cryptographic modules against profiling attacks Peer-reviewed

    Yongdae Kim, Naofumi Homma, Takafumi Aoki and Heebong Choi

    Lecture Notes in Computer Science (International Conference on Information Security and Cryptology) 7839 383-394 2012/11

  211. Measurement of side-channel information from cryptographic devices on security evaluation platform: demonstration of SPACES project Peer-reviewed

    Sho Endo, Yuichi Hayashi, Naofumi Homma, Takafumi Aoki, Toshihiro Katashita, Yohei Hori, Kazuo Sakiyama, Makoto Nagata, Jean-Luc Danger, Thanh-Ha Le and Pirouz Bazargan Sabet

    Proceedings of SICE Annual Conference 2012 313-316 2012/10

  212. High-accuracy image matching using phase-only correlation and its application Peer-reviewed

    Mamoru Miura, Shuji Sakai, Shoichiro Aoyama, Jumpei Ishii, Koichi Ito and Takafumi Aoki

    Proceedings of SICE Annual Conference 2012 (TuA11-04) 307-312 2012/10

  213. Feasibility of fault analysis based on intentional electromagnetic interference Peer-reviewed

    Junko Takahashi, Yu-ichi Hayashi, Naofumi Homma, Hitoshi Fuji and Takafumi Aoki

    Proceedings of IEEE International Symposium on Electromagnetic Compatibility 782-787 2012/10

  214. Wide-baseline stereo matching using ASIFT and POC Peer-reviewed

    Jumpei Ishii, Shuji Sakai, Koichi Ito and Takafumi Aoki

    Proceedings of International Conference on Image Processing 2977-2980 2012/09

  215. Reconstructing occluded regions using fast weighted PCA Peer-reviewed

    Tomoki Hosoi, Sei Nagashima, Koichi Ito and Takafumi Aoki

    Proceedings of International Conference on Image Processing 1729-1732 2012/09

  216. GPU implementation of phase-based stereo correspondence and its application Peer-reviewed

    Mamoru Miura, Kinya Fudano, Koichi Ito, Takafumi Aoki, Hiroyuki Takizawa and Hiroaki Kobayashi

    Proceedings of International Conference on Image Processing 1697-1700 2012/09

  217. Effective data processing and protection techniques for community network nodes Peer-reviewed

    Effective data processing and protection techniques for community network nodes

    Proceedings of the 15th International Symposium on Wireless Personal Multimedia Communications 571-572 2012/09

  218. An efficient countermeasure against fault sensitivity analysis using configurable delay block Peer-reviewed

    Sho Endo, Yang Li, Naofumi Homma, Kazuo Sakiyama, Kazuo Ohta and Takafumi Aoki

    Proceedings of Workshop on Fault Diagnosis and Tolerance in Cryptography 95-102 2012/09

  219. 組込み画像処理とオープンイノベーション Invited Peer-reviewed

    青木孝文

    Bulletin JASA 2012 43 1 2012/09

  220. An Efficient Method for Estimating the Area of Information Propagation through Electromagnetic Radiation Peer-reviewed

    Yu-ichi Hayashi, Naofumi Homma, Taishi Ikematsu, Takaaki Mizuki, Takafumi Aoki, Hideaki Sone, Jean-Luc Danger

    2012 IEEE International Symposium on Electromagnetic Compatibility (TH-PM-5-4) 800-805 2012/08/09

  221. Efficient Mapping of EM Radiation Associated with Information Leakage for Cryptographic Devices Peer-reviewed

    Haruki Shimada, Yu-ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki, Hideaki Sone, Laurent Sauvage, Jean-Luc Danger

    2012 IEEE International Symposium on Electromagnetic Compatibility (TH-PM-5-3) 794-799 2012/08/09

  222. A High-Accuracy Stereo Correspondence Matching Method Robust against Baseline Length Peer-reviewed

    SAKAI Shuji, ITO Koichi, AOKI Takafumi, UNTEN Hiroki

    The IEICE transactions on information and systems (Japanese edetion) J95-D (8) 1609-1622 2012/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1880-4535

  223. Using selected-plaintext sets for efficient evaluation of EM information leakage from cryptographic devices Peer-reviewed

    Haruki Shimada, Yu-ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki, Hideaki Sone

    SICE Annual Conference 64-67 2012/08

  224. Restoring occluded regions using FW-PCA for face recognition Peer-reviewed

    Tomoki Hosoi, Sei Nagashima, Koji Kobayashi, Koichi Ito and Takafumi Aoki

    Proceedings of IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshop 23-30 2012/06

  225. Evaluation of information leakage from cryptographic hardware via common-mode current Peer-reviewed

    Yuichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takeshi Sugawara, Yoshiki Kayano, Takafumi Aoki, Shigeki Minegishi, Akashi Satoh, Hideaki Sone and Hiroshi Inoue

    IEICE Transactions on Electronics E95-C (6) 1089-1097 2012/06

  226. Evaluation of Information Leakage from Cryptographic Hardware via Common-Mode Current Peer-reviewed

    Yu-ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takeshi Sugawara, Yoshiki Kayano, Takafumi Aoki, Shigeki Minegishi, Akashi Satoh, Hideaki Sone, Hiroshi Inoue

    IEICE Trans. Electronics E95-C (6) 1089-1097 2012/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transele.E95.C.1089  

    ISSN: 0916-8524

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    This paper presents a possibility of Electromagnetic (EM) analysis against cryptographic modules outside their security boundaries. The mechanism behind the information leakage is explained from the view point of Electromagnetic Compatibility: electric fluctuation released from cryptographic modules can conduct to peripheral circuits based on ground bounce, resulting in radiation. We demonstrate the consequence of the mechanism through experiments where the ISO/IEC standard block cipher AES (Advanced Encryption Standard) is implemented on an FPGA board and EM radiations from power and communication cables are measured. Correlation Electromagnetic Analysis (CEMA) is conducted in order to evaluate the information leakage. The experimental results show that secret keys are revealed even though there are various disturbing factors such as voltage regulators and AC/DC converters between the target module and the measurement points. We also discuss information-suppression techniques as electrical-level countermeasures against such CEMAs.

  227. Fair and consistent hardware evaluation of fourteen round two SHA-3 candidates Peer-reviewed

    Miroslav Knezevic, Kazuyuki Kobayashi, Jun Ikegami, Shin’ichiro Matsuo, Akashi Satoh, Unal Kocabas, Junfeng Fan, Toshiro Katashita, Takeshi Sugawara, Kazuo Sakiyama, Ingrid Verbauwhede, Kazuo Ohta, Naofumi Homma and Takafumi Aoki

    IEEE Transactions on Very Large Scale Integration Systems 20 (5) 827-840 2012/05

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/tvlsi.2011.2128353  

    ISSN: 1063-8210

    eISSN: 1557-9999

  228. Formal design of multiple-valued arithmetic algorithms over Galois fields and its application to cryptographic processors Peer-reviewed

    Naofumi Homma, Kazuya Saito and Takafumi Aoki

    Proceedings of the 42nd International Symposium on Multiple Valued Logic 110-115 2012/03

  229. A Formal approach to designing arithmetic circuits over Galois fields using symbolic computer algebra Peer-reviewed

    Kazuya Saito, Naofumi Homma and Takafumi Aoki

    Proceedings of the 17th Workshop on Synthesis And System Integration of Mixed Information technologies 153-158 2012/03

  230. A formal approach to designing cryptographic processors based on GF(2^m) arithmetic circuits Peer-reviewed

    Naofumi Homma, Kazuya Saito and Takafumi Aoki

    IEEE Transactions on Information Forensics & Security 7 (1) 3-13 2012/02

  231. A non-rigid registration method for medical volume data using 3D Phase-Only Correlation

    Yuichiro Tajima, Koichi Ito, Takafumi Aoki

    Proceedings - International Conference on Pattern Recognition 93-96 2012

    ISSN: 1051-4651

  232. Effective data processing and protection techniques for community network nodes

    Naofumi Homma, Takafumi Aoki

    International Symposium on Wireless Personal Multimedia Communications, WPMC 574-575 2012

    ISSN: 1347-6890

  233. Disaster Reconstruction and the Role of Universities; How did Tohoku University contribute to disaster response and recovery¿

    Aoki Takafumi

    The Journal of the Institute of Television Engineers of Japan 66 (3) 187-189 2012

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.3169/itej.66.187  

    ISSN: 1342-6907

  234. Recent Research Trends in Side Channel Attack on Cryptographic Modules and its Countermeasure Invited Peer-reviewed

    HAYASHI Yu-ichi, HOMMA Naofumi, MIZUKI Takaaki, AOKI Takafumi, SONE Hideaki

    IEEJ Transactions on Fundamentals and Materials 132 (1) 9-12 2012/01

    Publisher: The Institute of Electrical Engineers of Japan

    DOI: 10.1541/ieejfms.132.9  

    ISSN: 0385-4205

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    Cryptographic modules are now mounted on many commercial products for secure transactions and communications. On the other hand, a new class of physical attacks against cryptographic modules, which is called "side channel attack," is drawing much attention due to the non-invasive nature and effectiveness. This paper presents an overview of the research trends in side-channel attack and the related activities to counteract such attacks and evaluate the security of cryptographic modules.

  235. A configurable on-chip glitchy-clock generator for fault injection experiments Peer-reviewed

    Sho Endo, Takeshi Sugawara, Naofumi Homma, Takafumi Aoki, Akashi Satoh

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E95-A (1) 263-266 2012/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transfun.E95.A.263  

    ISSN: 0916-8508

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    This paper presents a glitchy-clock generator integrated in FPGA for evaluating fault injection attacks and their countermeasures on cryptographic modules. The proposed generator exploits clock management capabilities, which are common in modern FPGAs, to generate clock signal with temporal voltage spike. The shape and timing of the glitchy-clock cycle are configurable at run time. The proposed generator can be embedded in a single FPGA without any external instrument (e.g., a pulse generator and a variable power supply). Such integration enables reliable and reproducible fault injection experiments. In this paper, we examine the characteristics of the proposed generator through experiments on Side-channel Attack Standard Evaluation Board (SASEBO). The result shows that the timing of the glitches can be controlled at the step of about 0.17ns. We also demonstrate its application to the safe-error attack against an RSA processor.

  236. Acceleration of FDTD Method Using a Novel Algorithm on the Cell BE Peer-reviewed

    Sho Endo, Jun Sonoda, Motoyuki Sato, Takafumi Aoki

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS E94D (12) 2338-2344 2011/12

    DOI: 10.1587/transinf.E94.D.2338  

    ISSN: 0916-8532

  237. Mass Disaster Victim Identification and the Role of Information Technology Invited Peer-reviewed

    AOKI Takafumi

    The Journal of the Institute of Television Engineers of Japan 65 (12) k20-k20 2011/12

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.3169/itej.65.k20  

    ISSN: 1342-6907

  238. Hardware Implementations of Hash Function Luffa Peer-reviewed

    片下敏宏, 佐藤証, 菅原健, 本間尚文, 青木孝文

    情報処理学会論文誌ジャーナル(CD-ROM) 52 (12) 3755-3765 2011/12

    ISSN: 1882-7837

  239. An on-chip glitchy-clock generator for testing fault injection attacks Peer-reviewed

    Sho Endo, Naofumi Homma, Takeshi Sugawara, Takafumi Aoki and Akashi Satoh

    Journal of Cryptographic Engineering 1 (4) 265-270 2011/12

  240. Finger-knuckle-print recognition using BLPOC-based local block matching Peer-reviewed

    Shoichiro Aoyama, Koichi Ito and Takafumi Aoki

    Proceedings of 1st Asian Conference on Pattern Recognition 525-529 2011/11

  241. A geometric correction method using stereo vision for projected images Peer-reviewed

    Koichi Ito, Toru Takahashi and Takafumi Aoki

    Proceedings of 1st Asian Conference on Pattern Recognition 515-519 2011/11

  242. Accurate and dense wide-baseline stereo matching using SW-POC Peer-reviewed

    Shuji Sakai, Koichi Ito, Takafumi Aoki and Hiroki Unten

    Proceedings of 1st Asian Conference on Pattern Recognition 335-339 2011/11

  243. Translation-invariant scene grouping Peer-reviewed

    Pin-Ching Su, Hwann-Tzong Chen, Koichi Ito and Takafumi Aoki

    Proceedings of 1st Asian Conference on Pattern Recognition 234-238 2011/11

  244. Evaluating color reproduction accuracy of stereo one-shot six-band camera system Peer-reviewed

    Masaru Tsuchida, Shuji Sakai, Koichi Ito, Talahito Kawanishi, Kunio Kashino, Junji Yamato and Takahumi Aoki

    Proceedings of the 19th Color and Imaging Conference 326-331 2011/11

  245. Intentional electromagnetic interference for fault analysis on AES block cipher IC Peer-reviewed

    Yu-ichi Hayashi, Shigeto Gomisawa, Yang Li, Naofumi Homma, Kazuo Sakiyama, Takafumi Aoki and Kazuo Ohta

    Proceedings of International Workshop on Electromagnetic Compatibility of Integrated Circuits 235-240 2011/11

  246. High-performance architecture for concurrent error detection for AES processors Peer-reviewed

    Takeshi Sugawara, Naofumi Homma, Takafumi Aoki and Akashi Satoh

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E94-A (10) 1971-1980 2011/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transfun.E94.A.1971  

    ISSN: 0916-8508

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    This paper proposes an efficient scheme for concurrent error detection for hardware implementations of the block cipher AES. In the proposed scheme, the circuit component for the round function is divided into two stages, which are used alternately for encryption (or decryption) and error checking in a pipeline. The proposed scheme has a limited overhead with respect to size and speed for the following reasons. Firstly, the need for a double number of clock cycles is eliminated by virtue of the reduced critical path. Secondly, the scheme only requires minimal additional circuitry for error detection since the detection is performed by the remaining encryption (or decryption) components within the pipeline. AES hardware with the proposed scheme was designed and synthesized by using 90-nm CMOS standard cell library with various constraints. As a result, the proposed circuit achieved 1.66Gbps @ 12.9 Kgates for the compact version and 4.22Gbps @ 30.7 Kgates for the high-speed version. These performance characteristics are comparable to those of a basic AES circuit without error detection, where the overhead of the proposed scheme is estimated to be 14.5% at maximum. The proposed circuit was fabricated in the form of a chip, and its error detection performance was evaluated through experiments. The chip was tested with respect to fault injection by using clock glitch, and the proposed scheme successfully detected and reacted to all introduced errors.

  247. Application of a continuous-time level crossing quantization method for timing noise measurements Peer-reviewed

    Takahiro J. Yamaguchi, Mani Soma, Takafumi Aoki, Yasuo Furukawa, Katsuhiko Degawa, Kunihiro Asada, Mohamed Abbas and Satoshi Komatsu

    Proceeding of 2011 IEEE International Test Conference 1-10 2011/09

  248. Fast image inpainting using similarity of subspace method Peer-reviewed

    Tomoki Hosoi, Koji Kobayashi, Koichi Ito and Takafumi Aoki

    Proceedings of the 9th IEEE Conference on Image Processing 3502-3505 2011/09

  249. Suppression of information leakage from electronic devices based on SNR Peer-reviewed

    Taishi Ikematsu, Yu-ichi Hayashi, Takaaki Mizuki, Naofumi Homma, Takafumi Aoki, Hideaki Sone

    IEEE International Symposium on Electromagnetic Compatibility 2011 (THU-PM-2) 920-924 2011/08

    DOI: 10.1109/ISEMC.2011.6038440  

    ISSN: 2158-110X

  250. Non-Invasive EMI-Based Fault Injection Attack against Cryptographic Modules Peer-reviewed

    Yu-ichi Hayashi, Naofumi Homma, Takeshi Sugawara, Takaaki Mizuki, Takafumi Aoki, Hideaki Sone

    IEEE International Symposium on Electromagnetic Compatibility 2011 (THU-AM-4) 763-767 2011/08

    DOI: 10.1109/ISEMC.2011.6038411  

    ISSN: 2158-110X

  251. Geometric Correction for Projected Images Using High-Accuracy Stereo Vision Based on Phase-Only Correlation Peer-reviewed

    TAKAHASHI Toru, MIURA Mamoru, ITO Koichi, AOKI Takafumi

    The IEICE transactions on information and systems J94-D (8) 1387-1397 2011/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1880-4535

  252. High-Accuracy Volume Registration Based on 3D Phase-Only Correlation Peer-reviewed

    TAJIMA Yuichiro, MIYAZAWA Kazuyuki, AOKI Takafumi, KATSUMATA Atsushi, KOBAYASHI Koji

    The IEICE transactions on information and systems J94-D (8) 1398-1409 2011/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1880-4535

  253. Systematic design of RSA processors based on high-radix Montgomery multipliers Peer-reviewed

    Atsushi Miyamoto, Naofumi Homma, Takafumi Aoki, and Akashi Satoh

    IEEE Transactions on Very Large Scale Integration Systems 19 (7) 1136-1146 2011/07

  254. A correspondence search technique for geometric correction of projected images Peer-reviewed

    Toru Takahashi, Takafumi Aoki, Koichi Ito and Satoshi Kondo

    映像情報メディア学会誌 65 (6) 841-845 2011/06

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.3169/itej.65.841  

    ISSN: 1342-6907

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    This paper presents a technique for correspondence search between projector and camera images using SIFT (Scale-Invariant Feature Transform) and POC (Phase-Only Correlation). The correspondence search is a key task for camera-based geometric correction of projected imagery. In conventional methods, the correspondence is obtained by projecting the structured light on a projector screen. This paper proposes a geometric correction technique where we use only one snapshot of ordinary video sequences to find projector-camera correspondence. We adopt (i) SIFT-based feature matching to estimate an approximate homography between projector and camera images with a limited number of corresponding points and (ii) POC-based dense sub-pixel correspondence search to adjust precise position of corresponding points. Through a set of experiments, we demonstrate that the proposed technique achieves high-accuracy geometric correction, even if significant brightness change is observed between the original video content to be projected and the real projector image captured by a camera.

  255. GPU implementation of phase-based image correspondence matching and its evaluation Peer-reviewed

    Mamoru Miura, Kinya Fudano, Koichi Ito and Takafumi Aoki

    Proceedings of IEEE Symposium on Low-Power and High-Speed Chips (COOL Chips XIV) 2011/04

  256. Face recognition using phase-based correspondence matching Peer-reviewed

    Koichi Ito, Takafumi Aoki, Tomoki Hosoi and Koji Kobayashi

    Proceedings of the 9th IEEE Conference on Automatic Face and gesture Recognition 173-178 2011/03

  257. An on-chip glitchy-clock generator and its application to safe-error attack Peer-reviewed

    Sho Endo, Naofumi Homma, Takeshi Sugawara, Takafumi Aoki and Akashi Satoh

    International Workshop on Constructive Side-Channel Analysis and Secure Design (COSADE 2011) 175-182 2011/02

  258. A Calibration Technique for Multi-Projector Display Based on High-Accuracy Image Correspondence Using SIFT and Phase-Only Correlation Peer-reviewed

    TAKAHASHI Toru, KAWANO Tatsuya, ITO Koichi, AOKI Takafumi, KONDO Satoshi

    The IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (Japanese edition) A J94-A (2) 73-84 2011/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5707

  259. Accuracy Improvement of Wide-Baseline Stereo Matching Using SW-POC

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan 2011 26-26 2011

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI: 10.11528/tsjc.2011.0_26  

  260. Implementation of remote system using touchless palmprint recognition algorithm Peer-reviewed

    Haruki Ota, Ryu Watanabe, Koichi Ito, Toshiaki Tanaka and Takafumi Aoki

    Proceedings of the 8th International Conference on Advances in Mobile Computing & Multimedia 33-41 2010/11

    DOI: 10.1145/1971519.1971529  

  261. Side-channel Attack

    HOMMA Naofumi, AOKI Takafumi

    The Journal of the Institute of Television Engineers of Japan 64 (11) 1576-1579 2010/11

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.3169/itej.64.1576  

    ISSN: 1342-6907

  262. Performance evaluation of a geometric correction method for multi-projector display using SIFT and phase-only correlation Peer-reviewed

    Toru Takahashi, Tatsuya Kawano, Koichi Ito, Takafumi Aoki and Satoshi Kondo

    Proceedings of 2010 International Conference on Image Processing 1189-1192 2010/09

  263. Design and Evaluation of RSA Processor Generation System Peer-reviewed

    馬場祐一, 宮本篤志, 本間尚文, 青木孝文, 佐藤証

    情報処理学会論文誌ジャーナル(CD-ROM) 51 (9) 1847-1858 2010/09

    ISSN: 1882-7837

  264. A scale estimation algorithm using phase-based correspondence matching for electron microscope images Peer-reviewed

    Ayako Suzuki, Koichi Ito, Takafumi Aoki and Ruriko Tsuneta

    Proceedings of the 20th International Conference on Pattern Recognition 2420-2423 2010/08

  265. Profiling attack using multivariate regression analysis Peer-reviewed

    Takeshi Sugawara, Naofumi Homma, Takafumi Aoki, and Akashi Satoh

    IEICE Electronics Express 7 (15) 1139-1144 2010/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/elex.7.1139  

    ISSN: 1349-2543

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    This paper presents an improved side-channel attack based on multivariate regression analysis. The proposed method effectively refines measured side-channel traces using profiled information. Our method is advantageous to conventional profiling attacks as it is robust against attack configurations; it requires less traces while profiling and is less sensitive to the number of interesting points. We demonstrate the effectiveness of our method through concrete experiments in comparison with conventional methods. In the experiments, the proposed method is examined under various configurations to investigate its performance.

  266. Multiple-Valued Constant-Power Adder and Its Application to Cryptographic Processor Peer-reviewed

    Naofumi Homma, Yuichi Baba, Atsushi Miyamoto, and Takafumi Aoki

    IEICE Transactions on Information and Systems E93-D (8) 2117-2125 2010/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transinf.E93.D.2117  

    ISSN: 0916-8532

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    This paper proposes a constant-power adder based on multiple-valued logic and its application to cryptographic processors being resistant to side-channel attacks. The proposed adder is implemented in Multiple-Valued Current-Mode Logic (MV-CML). The important feature of MV-CML is that the power consumption can be constant regardless of input values, which makes it possible to prevent power-analysis attacks using dependencies between power consumption and intermediate values or operations of the executed cryptographic algorithms. In this paper, we focus on a multiple-valued Binary Carry-Save adder based on the Positive-Digit (PD) number system and its application to RSA processors. The power characteristic of the proposed design is evaluated with HSPICE simulation using 90nm process technology. The result shows that the proposed design can achieve constant power consumption with lower performance overhead in comparison with the conventional binary design.

  267. A stereo one-shot multi-band camera system for accurate color reproduction Peer-reviewed

    Masaru Tsuchida, Toru Takahashi, Koichi Ito, Takahito Kawanishi, Junji Yamato and Takafumi Aoki

    Proceedings of SIGGRAPH 2010 2010/07

  268. Information Leakage from Cryptographic Hardware via Common-Mode Current Invited Peer-reviewed

    Yu-ichi Hayashi, Takeshi Sugawara, Yoshiki Kayano, Naofumi Homma, Takaaki Mizuki, Akashi Satoh, Takafumi Aoki, Shigeki Minegishi, Hideaki Sone, Hiroshi Inoue

    Proceedings of IEEE International Symposium on Electromagnetic Compatibility 109-114 2010/07

  269. Development of an on-chip micro shielded-loop probe to evaluate performance of magnetic film to protect a cryptographic LSI from electromagnetic analysis Invited Peer-reviewed

    Masahiro Yamaguchi, Hideki Toriduka, Shoichi Kobayashi, Takeshi Sugawara, Naofumi Homma, Akashi Satoh, and Takafumi Aoki,

    Proceedings of IEEE International Symposium on Electromagnetic Compatibility 103-108 2010/07

    Publisher: IEEE

    DOI: 10.1109/isemc.2010.5711255  

  270. Electromagnetic Information Leakage for Side-Channel Analysis of Cryptographic Modules Invited Peer-reviewed

    Naofumi Homma, Takafumi Aoki, and Akashi Satoh

    Proceedings of IEEE International Symposium on Electromagnetic Compatibility 97-102 2010/07

  271. Hardware Implementations of Hash Function Luffa Peer-reviewed

    Akashi Satoh, Toshihiro Katashita, Takeshi Sugawara, Takafumi Aoki and Naofumi Homma

    Proceedings of Hardware-Oriented Security and Trust 102-106 2010/06

    Publisher: IEEE

    DOI: 10.1109/hst.2010.5513102  

  272. 情報技術を活用した身元確認に関する将来への提言?歯科医師による新しい時代の社会貢献へ向けて? Invited Peer-reviewed

    小菅栄子, 青木孝文, 松崎正樹, 五十嵐治

    日本歯科医師会雑誌 63 (3) 21-31 2010/06

  273. Comparative Power Analysis of Modular Exponentiation Algorithms Peer-reviewed

    Naofumi Homma, Atsushi Miyamoto, Takafumi Aoki, Akashi Satoh, and Adi Shamir

    IEEE Transactions on Computers 50 (6) 795-807 2010/06

  274. Design of tamper-resistant registers for multiple-valued cryptographic processors Peer-reviewed

    Yuichi Baba, Naofumi Homma, Atsushi Miyamoto, Takafumi Aoki

    Proceedings of the 40th International Symposium on Multiple Valued Logic 67-72 2010/05

  275. 歯科X線画像の自動照合による個人識別技術の展望

    小菅栄子, 青木孝文

    映像情報メディカル 42 (4) 356-357 2010/04

  276. Combined 2D/3D Face Recognition Using Passive Stereo Vision

    NAKAJIMA Hiroshi, NAGASHIMA Sei, AOKI Takafumi

    The Journal of the Institute of Television Engineers of Japan 64 (4) 472-476 2010/04

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.3169/itej.64.472  

    ISSN: 1342-6907

  277. Score-Level Fusion of Phase-Based and Feature-Based Fingerprint Matching Algorithms Peer-reviewed

    Koichi Ito, Ayumi Morita, Takafumi Aoki, Hiroshi Nakajima and Koji Kobayashi and Tatsuo Higuchi

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E93-A (3) 607-616 2010/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transfun.E93.A.607  

    ISSN: 0916-8508

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    This paper proposes an efficient fingerprint recognition algorithm combining phase-based image matching and feature-based matching. In our previous work, we have already proposed an efficient fingerprint recognition algorithm using Phase-Only Correlation (POC), and developed commercial fingerprint verification units for access control applications. The use of Fourier phase information of fingerprint images makes it possible to achieve robust recognition for weakly impressed, low-quality fingerprint images. This paper presents an idea of improving the performance of POC-based fingerprint matching by combining it with feature-based matching, where feature-based matching is introduced in order to improve recognition efficiency for images with nonlinear distortion. Experimental evaluation using two different types of fingerprint image databases demonstrates efficient recognition performance of the combination of the POC-based algorithm and the feature-based algorithm.

  278. Biasing power traces to improve correlation power analysis attacks Peer-reviewed

    Yongdae Kim, Takashi Sugawara, Naofumi Homma, Takafumi Aoki, Akashi Satoh

    Proceedings of International Workshop on Constructive Side-Channel Analysis and Secure Design 2010 77-80 2010/02

  279. Side Channel Attack on Cryptographic Modules and Its Security Evaluation Invited Peer-reviewed

    HOMMA Naofumi, AOKI Takafumi, SATOH Akashi

    The IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (Japanese edition) A J93-A (2) 42-51 2010/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5707

  280. Evaluation of Chosen-Message SPA Attacks against FPGA Implementations of RSA Processors Peer-reviewed

    MIYAMOTO Atsushi, HOMMA Naofumi, AOKI Takafumi, SATOH Akashi

    The IEICE transactions on information and systems J92-D (12) 2168-2180 2009/12

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1880-4535

  281. A discrimination method of 2D chest X-rays(examinations)and MDCT 3D comparison system using extract essence from volume elements for mass disasters and war victims Peer-reviewed

    Seiji M.Yamamoto, Ryota Shimofusa, Ken Motoori, Takuro Horikoshi, Toshiki Kazama and Takafumi Aoki

    Proceedings of Radiological Society of North America 2009 1071 2009/11

  282. An Improved Dental Radiograph Identification System Applicable to Different Types of Imaging Devices Peer-reviewed

    Koichi Ito, Yuki Hanzawa, Takafumi Aoki, Eiko Kosuge, Ryota Kawamata and Isamu Kashima

    Proceedings of Radiological Society of North America 2009 1071 2009/11

  283. A Novel Approach for Volume Registration Using 3D Phase-Only Correlation Peer-reviewed

    Kazuyuki Miyazawa, Yuichiro Tajima, Koichi Ito, Takafumi Aoki, Atsushi Katsumata and Koji Kobayashi

    Proceedings of Radiological Society of North America 2009 1070 2009/11

  284. Large-Scale Performance Evaluation of a Dental Radiograph Matching System for Forensic Human Identification Peer-reviewed

    Eiko Kosuge, Koichi Ito, Yuki Hanzawa and Takafumi Aoki

    Proceedings of Radiological Society of North America 2009 1069-1070 2009/11

  285. A Practical Human Identification Method Using Dental Radiographs and Dental CT Data Peer-reviewed

    Koichi Ito, Yuki Hanzawa, Takafumi Aoki, Masafumi Inagaki, Ryota Kawamata and Eiko Kosuge

    Proceedings of Radiological Society of North America 2009 1069 2009/11

  286. A palmprint recognition algorithm using principal component analysis of phase information Peer-reviewed

    Satoshi Iitsuka, Kazuyuki Miyazawa and Takafumi Aoki

    Proceedings of 2009 IEEE International Conference on Image Processing 1973-1976 2009/11

  287. Performance evaluation using Mandelbrot images for image registration algorithms Peer-reviewed

    Koichi Ito, Ayako Suzuki, Sei Nagashima and Takafumi Aoki

    Proceedings of the IEEE International Conference on Image Processing 2009 4393-4396 2009/11

  288. A palmprint recognition algorithm using phase-based correspondence matching Peer-reviewed

    Koichi Ito, Satoshi Iitsuka and Takafumi Aoki

    Proceedings of the IEEE International Conference on Image Processing 2009 1977-1980 2009/11

  289. High Scalable Circuit Architectures of the Hash Function Whirlpool Peer-reviewed

    菅原健, 本間尚文, 青木孝文, 佐藤証

    情報処理学会論文誌ジャーナル(CD-ROM) 50 (11) 2618-2632 2009/11

    ISSN: 1882-7837

  290. Side Channel Attack to Magnetic Near Field of Cryptographic LSI and its Countermeasure by means of Magnetic Thin Film Peer-reviewed

    Masahiro Yamaguchi, Hideki, Toriduka, Shoichi Kobayashi, Takeshi Sugawara, Naofumi Homma, Akashi Satoh, Takafumi Aoki

    Proceedings of Soft Magnetic Materials 19 (A3-11) 2009/09

  291. Mechanism behind Information Leakage in Electromagnetic Analysis of Cryptographic Modules Peer-reviewed

    Takeshi Sugawara, Yu-ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki, Hideaki Sone, and Akashi Satoh

    Proceedings of the 10th International Workshop on Information Security Applications 66-78 2009/08

    Publisher: Springer Berlin Heidelberg

    DOI: 10.1007/978-3-642-10838-9_6  

    ISSN: 0302-9743

    eISSN: 1611-3349

  292. Differential Power Analysis of AES ASIC Implementations with Various S-box Circuits Peer-reviewed

    Takeshi Sugawara, Naofumi Homma, Takafumi Aoki, and Akashi Satoh

    Proceedings of European Conference on Circuit Theory and Design 2009 395-398 2009/08

  293. Development of Side-Channel Attack Standard Evaluation Environment Peer-reviewed

    Toshihiro Katashita, Akashi Satoh, Takeshi Sugawara, Naofumi Homma, and Takafumi Aoki

    Proceedings of European Conference on Circuit Theory and Design 2009 403-408 2009/08

    Publisher: IEEE

    DOI: 10.1109/ecctd.2009.5275001  

  294. Super-Resolution De-Interlacing Using Phase-Only Correlation Peer-reviewed

    NUMA Norihito, ITO Koichi, AOKI Takafumi, KONDO Satoshi

    The IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (Japanese edition) A J92-A (8) 529-539 2009/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5707

  295. An Analysis of Information Leakage from a Cryptographic Hardware via Common-Mode Current Peer-reviewed

    Yu-ichi Hayashi, Takeshi Sugawara, Yoshiki Kayano, Naofumi Homma, Takaaki Mizuki, Akashi Satoh, Takafumi Aoki, Shigeki Minegishi, Hideaki Sone, and Hiroshi Inoue

    Proceedings of 2009 International Symposium on Electromagnetic Compatibility 17-20 2009/07

  296. Spectrum Analysis on Cryptographic Modules to Counteract Side-Channel Attacks Peer-reviewed

    Takeshi Sugawara, Yu-ichi Hayashi, Naofumi Homma, Takaaki Mizuki, Takafumi Aoki, Hideaki Sone, and Akashi Satoh

    Proceedings of 2009 International Symposium on Electromagnetic Compatibility 21-24 2009/07

  297. Toward Biomolecular Computers Using Reaction-Diffusion Dynamics Peer-reviewed

    Masahiko Hiratsuka, Koichi Ito, Takafumi Aoki, and Tatsuo Higuchi

    International Journal of Nanotechnology and Molecular Computing 1 (3) 17-25 2009/07

  298. High-Performance Hardware Architectures for Galois Counter Mode Peer-reviewed

    Akashi Satoh, Takeshi Sugawara, Naofumi Homma, and Takafumi Aoki

    IEEE Transactions on Computers 58 (7) 917-930 2009/07

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/tc.2008.217  

    ISSN: 0018-9340

  299. An Image Correction Method Using SIFT and Phase-Only Correlation for Multi-Projector Display Peer-reviewed

    Toru Takahashi, Tatsuya Kawano, Takafumi Aoki and Satoshi Kondo

    Proceedings of 6th IEEE International Workshop on Projector-Camera Systems 2009/06

  300. Evaluation of Simple/Comparative Power Analysis Against an RSA ASIC Implementation Peer-reviewed

    Atsushi Miyamoto, Naofumi Homma, Takafumi Aoki, and Akashi Satoh

    Proceedings of 2009 IEEE International Symposium on Circuits and Systems 2918-2921 2009/05

  301. Multiple-Valued Constant-Power Adder for Cryptographic Processor Peer-reviewed

    Yuichi Baba, Atsushi Miyamoto, Naofumi Homma and Takafumi Aoki

    Proceedings of 39th International Synposium on Multiple-Valued Logic 239-244 2009/05

  302. Phase-based alignment of two signals having partially overlapped spectra Peer-reviewed

    Albert Tumewu, Kazuyuki Miyazawa, Takafumi Aoki, Takahiro J. Yamaguchi, Katsuhiko Degawa, and Takayuki Akita

    Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing 2009 3337-3340 2009/04

  303. A Robust 3D Face Recognition Algorithm Using Passive Stereo Vision Peer-reviewed

    Akihiro Hayasaka, Koichi Ito, Takafumi Aoki, Hiroshi Nakajima and Koji Kobayashi

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E92-A (4) 1047-1055 2009/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transfun.E92.A.1047  

    ISSN: 0916-8508

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    The recognition performance of the conventional 3D face recognition algorithm using ICP (Iterative Closest Point) is degraded for the 3D face data with expression changes. Addressing this problem, we consider the use of the expression-invariant local regions of a face. We find the expression-invariant regions through the distance analysis between 3D face data with the neutral expression and smile, and propose a robust 3D face recognition algorithm using passive stereo vision. We demonstrate efficient recognition performance of the proposed algorithm compared with the conventional ICP-based algorithm through the experiment using a stereo face image database which includes the face images with expression changes.

  304. An experimental comparison of power analysis attacks against RSA processors on ASIC and FPGA Peer-reviewed

    Atsushi Miyamoto, Naofumi Homma, Takafumi Aoki, and Akashi Satoh

    Proceedings of 15th Workshop on Synthesis And System Integration of Mixed Information technologies 58-63 2009/03

  305. Differential interference contrast microscope using photonic crystals for phase imaging and three-dimensional shape reconstruction Peer-reviewed

    Laurent Fabre, Yoshihiko Inoue, Takafumi Aoki and Shojiro Kawakami

    Applied Optics 48 (7) 1347-1357 2009/03

  306. Three-dimensional metal artifact reduction method for dental conebeam CT scanners Peer-reviewed

    Koji Kobayashi, Atsushi Katsumata, Koichi Ito and Takafumi Aoki

    Proceedings of SPIE Medical Imaging 7158 2009/02

  307. Three-diensional metal artifact reduction method for dental conebeam CT scanners Peer-reviewed

    Koji Kobayashi,Atsushi Katsumata,Koichi Ito,Takafumi Aoki

    Proceedings of SPIE Medical Imaging 2009/02

  308. High-accuracy machine vision technology using phase-only correlation --- From 3D measurement to biomedical imaging ---

    Takafumi Aoki, Naofumi Homma and Koichi Ito

    Proceedings of the 3rd International Symposium on Information Electronics Systems 5379 28-40 2009/01

  309. High-accuracy estimation of image rotation using 1D phase-only correlation Peer-reviewed

    Sei Nagashima, Koichi Ito, Takafumi Aoki, Hideaki Ishii and Koji Kobayashi

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E92-A (1) 235-243 2009/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transfun.E92.A.235  

    ISSN: 0916-8508

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    This paper presents a technique for high-accuracy estimation of image rotation using 1D Phase-Only Correlation (POC). The rotation angle between two images is estimated as follows: (i) compute the amplitude spectra of the given images, (ii) transform the coordinate system of amplitude spectra from Cartesian coordinates to polar coordinates, and (iii) estimate the translational displacement between the polar-mapped amplitude spectra to obtain the rotation angle. While the conventional approach is to employ 2D POC for high-accuracy displacement estimation in (iii), this paper proposes the use of 1D POC with an adaptive line selection scheme. The proposed technique makes possible to improve the accuracy of rotation estimation for low contrast images of artificial objects with regular geometric shapes and to reduce the total computation cost by 50%.

  310. High-Accuracy Estimation of Image Rotation Using 1D Phase-Only Correlation Peer-reviewed

    Sei Nagashima, Koichi Ito, Takafumi Aoki, Hideaki Ishii and Koji Kobayashi

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E92-A (1) 235-243 2009/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transfun.E92.A.235  

    ISSN: 0916-8508

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    This paper presents a technique for high-accuracy estimation of image rotation using 1D Phase-Only Correlation (POC). The rotation angle between two images is estimated as follows: (i) compute the amplitude spectra of the given images, (ii) transform the coordinate system of amplitude spectra from Cartesian coordinates to polar coordinates, and (iii) estimate the translational displacement between the polar-mapped amplitude spectra to obtain the rotation angle. While the conventional approach is to employ 2D POC for high-accuracy displacement estimation in (iii), this paper proposes the use of 1D POC with an adaptive line selection scheme. The proposed technique makes possible to improve the accuracy of rotation estimation for low contrast images of artificial objects with regular geometric shapes and to reduce the total computation cost by 50%.

  311. Systematic approach to designing multiple-valued arithmetic circuits based on arithmetic description language Peer-reviewed

    Naofumi Homma, Yuki Watanabe, Katsuhiko Degawa, Takafumi Aoki, Tatsuo Higuchi

    Journal of Multiple-Valued Logic and Soft Computing 15 (4) 329-340 2009

  312. Clean up your image using internet photo collections Peer-reviewed

    Hanieh Taipalus, Satoshi Kondo, Takafumi Aoki

    Proceedings of the 1st ACM SIGGRAPH Conference and Exhibition on Computer Graphics and Interactive Techniques in Asia 2008/12

  313. A systematic approach for designing redundant arithmetic adders based on counter tree diagrams Peer-reviewed

    Naofumi Homma, Takafumi Aoki, and Tatsuo Higuchi

    IEEE Transactions on Computers 57 (12) 1633-1646 2008/12

  314. Enhanced Correlation Power Analysis using Key Screening Techniques Peer-reviewed

    Toshihiro Katashita, Akashi Satoh, Takeshi Sugawara, Naofumi Homma and Takafumi Aoki

    2008 International Conference on ReConFigurable Computing and FPGAs 403-408 2008/12

    Publisher: IEEE

    DOI: 10.1109/reconfig.2008.16  

  315. Image Correction Method for Multi-Projector Display Using SIFT Features Peer-reviewed

    Toru Takahashi, Norihito Numa, Tatsuya Kawano, Takafumi Aoki and Satoshi Kondo

    The 1st ACM SIGGRAPH Conference and Exhibition on Computer Graphics and Interactive Techniques in Asia (SIGGRAPH ASIA 2008) 2008/12

  316. A Practical Palmprint Recognition Algorithm Using Phase Information Peer-reviewed

    Satoshi Iitsuka, Koichi Ito and Takafumi Aoki

    Proceedings of the 19th International Conference on Pattern Recognition (WeBCT9.18) 1-4 2008/12

  317. A practical method to reducing metal artifact for dental CT scanners Peer-reviewed

    Koji Kobayashi, Atsushi Katsumata, Takafumi Aoki and Koichi Ito

    Proceedings of the 19th International Conference on Pattern Recognition (WeAT8.16) 1-4 2008/12

  318. Medical image registration using phase-only correlation for distorted dental radiographs Peer-reviewed

    Koichi Ito, Takafumi Aoki, Eiko Kosuge, Ryota Kawamata and Isamu Kashima

    Proceedings of the 19th International Conference on Pattern Recognition (WeAT8.10) 1-4 2008/12

  319. A practical metal artifact reduction method for dental cone beam CT scanners Peer-reviewed

    Koji Kobayashi, Atsushi Katsumata, Takafumi Aoki and Koichi Ito

    Radiological Society of North America (RSNA) 2008 408 2008/12

  320. Development and evaluation of an automated human identification system using dental radiographs Peer-reviewed

    Koichi Ito, Takafumi Aoki, Eiko Kosuge, Ryota Kawamata and Isamu Kashima

    Radiological Society of North America (RSNA) 2008 1061 2008/12

  321. An image completion algorithm using occlusion-free images from Internet photo sharing sites Peer-reviewed

    Naofumi Homma, Takafumi Aoki, and Tatsuo Higuchi

    IEEE Transactions on Computers 57 (12) 1633-1346 2008/12

  322. Use of Images in Internet Photo Sharing Sites for Example-Based Super-Resolution Peer-reviewed

    KONDO Satoshi, TAIPALUS Hanieh, TOMA Tadamasa, AOKI Takafumi

    The Journal of the Institute of Television Engineers of Japan 62 (11) 1836-1839 2008/11

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.3169/itej.62.1836  

    ISSN: 1342-6907

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    Example-based super-resolution is an image interpolation algorithm that uses a database of training images to create plausible high-frequency details in zoomed images. The algorithm is fairly simple; however its performance heavily depends on the database. In particular, when the characteristics of a target image to be magnified are different from the training images, the quality of the super-resolved image degrades. By creating a database consisting of a few training images that closely resemble the target image, we have solved the above problem and improved the performance of example-based super-resolution. This is done by transforming selected images which are downloaded from Internet photo sharing sites, to match their characteristics with those of the target image before adding them to the database. The advantage of this method is that by skillfully creating a database of suitable training images, we are able to improve the quality of the super-resolved image.

  323. Systematic design of high-radix Montgomery multipliers for RSA processors Peer-reviewed

    Atsushi Miyamoto, Naofumi Homma, Takafumi Aoki, and Akashi Satoh

    Proceedings of the 26th IEEE International Conference of Computer Design 416-421 2008/10

  324. A Robot-based 3D Body Scanning System Using Passive Stereo Vision Peer-reviewed

    Kazuyuki Miyazawa and Takafumi Aoki

    Proceeding of the International Conference on Image Processing 2008 305-308 2008/10

  325. Arithmetic Circuit Verification Based on Symbolic Computer Algebra Peer-reviewed

    Yuki Watanabe, Naofumi Homma, Takafumi Aoki, and Tatsuo Higuchi

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E91-A (10) 3038-3046 2008/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1093/ietfec/e91-a.10.3038  

    ISSN: 0916-8508

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    This paper presents a formal approach to verify arithmetic circuits using symbolic computer algebra. Our method describes arithmetic circuits directly with high-level mathematical objects based on weighted number systems and arithmetic formulae. Such circuit description can be effectively verified by polynomial reduction techniques using Gröbner Bases. In this paper, we describe how the symbolic computer algebra can be used to describe and verify arithmetic circuits. The advantageous effects of the proposed approach are demonstrated through experimental verification of some arithmetic circuits such as multiply-accumulator and FIR filter. The result shows that the proposed approach has a definite possibility of verifying practical arithmetic circuits.

  326. An image completion algorithm using occlusion-free images from Internet photo sharing sites Peer-reviewed

    Hanieh Amirshahi, Satoshi Kondo, Koichi Ito and Takafumi Aoki

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E91-A (10) 2918-2927 2008/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1093/ietfec/e91-a.10.2918  

    ISSN: 0916-8508

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    In this paper, we propose an image completion algorithm which takes advantage of the countless number of images available on Internet photo sharing sites to replace occlusions in an input image. The algorithm 1) automatically selects the most suitable images from a database of downloaded images and 2) seamlessly completes the input image using the selected images with minimal user intervention. Experimental results on input images captured at various locations and scene conditions demonstrate the effectiveness of the proposed technique in seamlessly reconstructing user-defined occlusions.

  327. An Effective Approach for Iris Recognition Using Phase-Based Image Matching Peer-reviewed

    Kazuyuki Miyazawa, Koichi Ito, Takafumi Aoki, Koji Kobayashi and Hiroshi Nakajima

    IEEE Transactions on Pattern Analysis and Machine Intelligence 30 (10) 1741-1756 2008/10

  328. Chosen-message SPA attacks against FPGA-based RSA hardware implementations Peer-reviewed

    Atsushi Miyamoto, Naofumi Homma, Takafumi Aoki, and Akashi Satoh

    Proceedings of the 2008 International Conference on Field Programmable Logic and Applications 35-40 2008/09

  329. Compact ASIC Architectures for the 512-bit Hash Function Whirlpool Peer-reviewed

    T. Sugawara, N. Homma, T. Aoki, and A. Satoh

    9th Workshop on Information Security Applications 2008/09

  330. A High-Accuracy Sub-Pixel Correspondence Technique Using 1D Phase-Only Correlation Peer-reviewed

    SHIBAHARA Takuma, NUMA Norihito, NAGASHIMA Sei, AOKI Takafumi, NAKAJIMA Hiroshi, KOBAYASHI Koji

    The IEICE transactions on information and systems J91-D (9) 2343-2356 2008/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1880-4535

  331. High-performance concurrent error detection scheme for AES hardware Peer-reviewed

    Akashi Satoh, Takeshi Sugawara, Naofumi Homma, and Takafumi Aoki

    Cryptographic Hardware and Embedded Systems, Lecture Notes in Computer Science 5154 100-112 2008/08

  332. Collision-based power analysis of modular exponentiation using chosen-message pairs Peer-reviewed

    Naofumi Homma, Atsushi Miyamoto, Takafumi Aoki, Akashi Satoh, and Adi Shamir

    Cryptographic Hardware and Embedded Systems, Lecture Notes in Computer Science 5154 15-29 2008/08

  333. A Geometric Correction Method for Projected Images Using SIFT Feature Points Peer-reviewed

    Toru Takahashi, Norihito Numa, Takafumi Aoki and Satoshi Kondo

    5th ACM/IEEE International Workshop on Projector-Camera Systems 2008/08

  334. A Passive 3D Face Recognition System and Its Performance Evaluation Peer-reviewed

    Akihiro Hayasaka, Takuma Shibahara, Koichi Ito, Takafumi Aoki, Hiroshi Nakajima and Koji Kobayashi

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E91-A (8) 1974-1981 2008/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1093/ietfec/e91-a.8.1974  

    ISSN: 0916-8508

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    This paper proposes a three-dimensional (3D) face recognition system using passive stereo vision. So far, the reported 3D face recognition techniques have used active 3D measurement methods to capture high-quality 3D facial information. However, active methods employ structured illumination (structure projection, phase shift, moire topography, etc.) or laser scanning, which is not desirable in many human recognition applications. Addressing this problem, we propose a face recognition system that uses (i) passive stereo vision to capture 3D facial information and (ii) 3D matching using an ICP (Iterative Closest Point) algorithm with its improvement techniques. Experimental evaluation demonstrates efficient recognition performance of the proposed system compared with an active 3D face recognition system and a passive 3D face recognition system employing the original ICP algorithm.

  335. Still Image Coding Technique Using Internet Photo-Sharing Service Peer-reviewed

    TOMA Tadamasa, KONDO Satoshi, AMIRSHAHI Hanieh, AOKI Takafumi

    The IEICE transactions on information and systems J91-D (8) 1959-1962 2008/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1880-4535

  336. Formal Verification of VLSI Circuits Using Groebner Bases Invited Peer-reviewed

    Yuki Watanabe, Nofumi Homma, Takafumi Aoki and Tatsuo Higuchi

    Applications of Computer Algebra 2008/07

  337. A High-Accuracy Image Registration Algorithm Using Phase-Only Correlation for Dental Radiographs Peer-reviewed

    ITO Koichi, NIKAIDO Akira, AOKI Takafumi, KOSUGE Eiko, KAWAMATA Ryota, KASHIMA Isamu

    The IEICE transactions on information and systems J91-D (7) 1788-1797 2008/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1880-4535

  338. Power analysis of RSA processors with high-radix Montgomery multipliers Peer-reviewed

    Naofumi Homma, Atsushi Miyamoto, Takafumi Aoki, and Akashi Satoh

    Proceedings of 17th International Workshop on Post-Binary ULSI Systems 21-24 2008/05

  339. High-level Design of Multiple-Valued Arithmetic Circuits Based on Arithmetic Description Language Peer-reviewed

    Yuki Watanabe, Nofumi Homma, Katsuhiko Degawa, Takafumi Aoki and Tatsuo Higuchi

    The 38th International Symposium on Multiple Valued Logic 112-117 2008/05

  340. Arithmetic Module Generator with Algorithm Optimization Capability Peer-reviewed

    Yuki Watanabe, Nofumi Homma, Takafumi Aoki and Tatsuo Higuchi

    Proceedings of 2008 International Symposium on Circuits and Systems 1796-1799 2008/05

  341. High-performance ASIC Implementations of the 128-bit Block Cipher CLEFIA Peer-reviewed

    Takeshi Sugawara, Naofumi Homma, Takafumi Aoki and Akashi Satoh

    Proceedings of 2008 International Symposium on Circuits and Systems 2925-2928 2008/05

  342. Enhanced Power Analysis Attack Using Chosen Message against RSA Hardware Implementations Peer-reviewed

    Atsushi Miyamoto, Naofumi Homma, Takafumi Aoki and Akashi Satoh

    Proceedings of 2008 International Symposium on Circuits and Systems 3282-3285 2008/05

  343. A Palmprint Recognition Algorithm Using Phase-Only Correlation Peer-reviewed

    Koichi Ito, Takafumi Aoki, Hiroshi Nakajima, Koji Kobayashi and Tatsuo Higuchi

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E91-A (4) 1023-1030 2008/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1093/ietfec/e91-a.4.1023  

    ISSN: 0916-8508

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    This paper presents a palmprint recognition algorithm using Phase-Only Correlation (POC). The use of phase components in 2D (two-dimensional) discrete Fourier transforms of palmprint images makes it possible to achieve highly robust image registration and matching. In the proposed algorithm, POC is used to align scaling, rotation and translation between two palmprint images, and evaluate similarity between them. Experimental evaluation using a palmprint image database clearly demonstrates efficient matching performance of the proposed algorithm.

  344. Shortest path search using a reaction-diffusion processor Peer-reviewed

    Masahiko Hiratsuka, Koichi Ito, Takafumi Aoki and Tatsuo Higuchi

    International Journal of Unconventional Computing 4 (2) 113-123 2008/04

  345. A High-Accuracy Stereo Correspondence Technique Using 1D Band-Limited Phase-Only Correlation Peer-reviewed

    Takuma Shibahara, Takafumi Aoki, Hiroshi Nakajima and Koji Kobayashi

    IEICE Electronics Express 5 (4) 125-130 2008/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/elex.5.125  

    ISSN: 1349-2543

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    This paper presents a technique for high-accuracy correspondence search between stereo images using 1D Band-Limited Phase-Only Correlation(BLPOC). The stereo correspondence search can be reduced to 1D search through image rectification. However, we usually employ block matching with 2D rectangular image blocks for finding the best matching point. In this paper, we propose the use of 1D BLPOC instead of 2D block matching for correspondence search. The use of 1D BLPOC makes possible significant reduction in computational cost without sacrificing reconstruction accuracy. The resulting reconstruction accuracy is comparable with 2D POC-based method, and is much higher than SAD/SSD-based methods.

  346. A high-resolution phase-based waveform matching and its application to side-channel attacks Peer-reviewed

    Naofumi Homma, Sei Nagashima, Takeshi Sugawara, Takafumi Aoki and Akashi Satoh

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E91-A (1) 193-202 2008/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1093/ietfec/e91-a.1.193  

    ISSN: 0916-8508

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    This paper presents an enhanced side-channel attack using a phase-based waveform matching technique. Conventionally, side-channel attacks such as Simple Power Analysis (SPA) and Differential Power Analysis (DPA) capture signal waveforms (e. g., power traces) with a trigger signal or a system clock, and use a statistical analysis of the waveforms to reduce noise and to retrieve secret information. However, the waveform data often includes displacement errors, and this degrades the accuracy of the statistical analysis. The use of a Phase-Only Correlation (POC) technique makes it possible to estimate the displacements between the signal waveforms with higher resolution than the sampling resolution. The accuracy of side-channel attacks can be enhanced using the POC-based matching method. Also, a popular DPA countermeasure of creating distorted waveforms with random delays can be defeated by our method. In this paper, we demonstrate the advantages of the proposed method in comparison with conventional approaches of experimental DPA and Differential ElectroMagnetic Analysis (DEMA) against DES software and hardware implementations.

  347. A dental radiograph recognition system using phase-only correlation for human identification Peer-reviewed

    Koichi Ito, Akira Nikaido, Takafumi Aoki, Eiko Kosuge, Ryota Kawamata and Isamu Kashima

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E91-A (1) 298-305 2008/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1093/ietfec/e91-a.1.298  

    ISSN: 0916-8508

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    In mass disasters such as earthquakes, fire disasters, tsunami, and terrorism, dental records have been used for identifying victims due to their processing time and accuracy. The greater the number of victims, the more time the identification tasks require, since a manual comparison between the dental radiograph records is done by forensic experts. Addressing this problem, this paper presents an efficient dental radiograph recognition system using Phase-Only Correlation (POC) for human identification. The use of phase components in 2D (two-dimensional) discrete Fourier transforms of dental radiograph images makes possible to achieve highly robust image registration and recognition. Experimental evaluation using a set of dental radiographs indicates that the proposed system exhibits efficient recognition performance for low-quality images.

  348. An automated dental radiograph identification system using phase-only correlation for mass disasters Peer-reviewed

    Eiko Kosuge, Ryota Kawamata. Isamu Kashima, Akira Nikaido, Koichi Ito and Takafumi Aoki

    Radiological Society of North America 2007 974 2007/11

  349. Design of multiple-valued arithmetic circuits using counter tree diagrams Peer-reviewed

    Naofumi Homma, Katsuhiko Degawa, Takafumi Aoki, and Tatsuo Higuchi

    Journal of Multiple-Valued Logic and Soft Computing 13 (4月6日) 487-502 2007/11

  350. High-speed pipelined hardware architecture for Galois counter mode Peer-reviewed

    Akashi Satoh, Takeshi Sugawara and Takafumi Aoki

    Lecture Notes on Computer Science (Information Security Conference) (4779) 118-129 2007/10

  351. Magnification-correcting algorithm within 1% error for scanning transmission electron microscope Peer-reviewed

    Ruriko Tsuneta, Masanari Koguchi, Sei Nagashima and Takafumi Aoki

    Proceedings of the 6th International Symposium on Atomic Level Characterizations for New Materials and Devices (TuP-11) 34-34 2007/10

  352. Formal Representation and Verification of Arithmetic Circuits Using Symbolic Computer Algebra Peer-reviewed

    Yuki Watanabe, Nofumi Homma, Takafumi Aoki and Tatsuo Higuchi

    Proceeding of the 14th Workshop on Synthesis And System Integration of Mixed Information technologies 461-468 2007/10

  353. Application of Symbolic Computer Algebra to Arithmetic Circuit Verification Peer-reviewed

    Yuki Watanabe, Nofumi Homma, Takafumi Aoki and Tatsuo Higuchi

    Proceedings of the International Conference on Computer Design 2007 25-32 2007/10

  354. A sub-pixel stereo correspondence technique based on 1D phase-only correlation Peer-reviewed

    Takuma Shibahara, Takafumi Aoki, Hiroshi Nakajima and Koji Kobayashi

    Proceedings of the IEEE International Conference on Image Processing 2007 221 V-221-V-224 2007/09

  355. A phase-based image registration algorithm for dental radiograph identification Peer-reviewed

    Akira Nikaido, Koichi Ito, Takafumi Aoki, Eiko Kosuge, Ryota Kawamata

    Proceedings of the IEEE International Conference on Image Processing 2007 VI-229-VI-232 2007/09

  356. Phase-based Image Matching and Its Applications : From 3D Vision to Biometrics Peer-reviewed

    AOKI Takafumi, ITO Koichi, HOMMA Naofumi

    The Journal of the Institute of Electronics, Information and Communication Engineers 90 (8) 680-685 2007/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5693

  357. ASIC Performance Comparison for the ISO Standard Block Ciphers Peer-reviewed

    Takeshi Sugawara, Naofumi Homma, Takafumi Aoki and Akashi Satoh

    Proceedings of the 2nd Joint Workshop on Information Security 485-498 2007/08

  358. A High-Accuracy Rotation Estimation Algorithm Based on 1D Phase-Only Correlation Peer-reviewed

    Sei Nagasima, Koichi Ito, Takafumi Aoki, Hideaki Ishii and Koji Kobayashi

    Lecture Notes in Computer Science (Proceedings of the International Conference on Image Analysis and Recognition 2007) 4633 210-221 2007/08

  359. Example-based super-resolution using Internet photo collection Peer-reviewed

    Satoshi Kondo, Hanieh Amirshahi, Tadamasa Toma and Takafumi Aoki

    SIGGRAPH Posters 2007/08

  360. High-Accuracy Machine Vision Using Phase-Only Correlation:−Toward Image Sensing Technology Breaking the Limit of Pixel Resolution− Invited Peer-reviewed

    AOKI Takafumi, ITO Koichi, SHIBAHARA Takuma, NAGASHIMA Sei

    IEICE Fundamentals Review 1 (1) 30-40 2007/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/essfr.1.1_30  

    ISSN: 1882-0875

  361. DPA Using Phase-Based Waveform Matching against Random-Delay Countermeasure Peer-reviewed

    S. Nagashima, N. Homma, Y. Imai, T. Aoki and A. Satoh

    Proceedings of 2007 International Symposium on Circuits and Systems 1807-1810 2007/05

  362. Algorithm-level optimization of multiple-valued arithmetic circuits using counter tree diagrams Peer-reviewed

    Naofumi Homma, Katsuhiko Degawa, Takafumi Aoki, and Tatsuo Higuchi

    Proceedings of the 37th IEEE International Symposium on Multiple-Valued Logic (31) 1-8 2007/05

  363. A High-Performance ASIC Implementation of the 64-bit Block Cipher CAST-128 Peer-reviewed

    Takeshi Sugawara, Naofumi Homma, Takafumi Aoki and Akashi Satoh

    Proceedings of 2006 International Symposium on Intelligent Signal Processing and Communication Systems 1859-1862 2007/05

    Publisher: IEEE

    DOI: 10.1109/iscas.2007.378277  

  364. SPA against an FPGA-Based RSA Implementationwith a High-Radix Montgomery Multiplier Peer-reviewed

    Atsushi Miyamoto, Naofumi Homma, Takafumi Aoki and Akashi Sato

    Proceedings of 2006 International Symposium on Intelligent Signal Processing and Communication Systems 1847-1850 2007/05

  365. Polalization Imaging Device Utilizing Photonic Crystal Polarizer Invited Peer-reviewed

    KAWAKAMI Shojiro, KAWASHIMA Takayuki, INOUE Yoshihiko, HOMMA Yoh, SATO Takashi, OTA Shinichi, NAGASHIMA Sei, AOKI Takafumi

    The IEICE transactions on electronics C J90-C (1) 17-24 2007/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1345-2827

  366. Synthesisi of current mirrors based on evolutionary graph generation with transmigration capability Peer-reviewed

    Masanori Natsui, Yoshiaki Tadokoro, Naofumi Homma, Takafumi Aoki and Tatsuo Higuchi

    IEICE Electronics Express 4 (3) 88-93 2007/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/elex.4.88  

    ISSN: 1349-2543

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    This paper presents a novel graph-based evolutionary optimization technique called Evolutionary Graph Generation(EGG), and its application to the transistor-level design of analog circuits. The evolution process of EGG can be accelerated by a simple operation, called "transmigration", which is to import previously generated solutions for creating advanced solutions. In this paper, we demonstrate the potential of EGG with transmigration capability through an experimental synthesis of current mirror circuits.

  367. A Phase-Based Palmprint Recognition Algorithm and Its Experimental Evaluation Peer-reviewed

    Koichi Ito, Takafumi Aoki, Hiroshi Nakajima, Koji Kobayashi and Tatsuo Higuchi

    Proceedings of 2006 International Symposium on Intelligent Signal Processing and Communication Systems 215-218 2006/12

  368. A 3D Face Recognition System Using Passive Stereo Vision and Its Performance Evaluation Peer-reviewed

    Akihiro Hayasaka, Takuma Shibahara, Koichi Ito, Takafumi Aoki, Hiroshi Nakajima and Koji Kobayashi

    Proceedings of 2006 International Symposium on Intelligent Signal Processing and Communication Systems 379-382 2006/12

  369. Formal Design of Decimal Arithmetic Circuits Using Arithmetic Communication Systems, Peer-reviewed

    Yuki Watanabe, Nofumi Homma, Takafumi Aoki and Tatsuo Higuchi

    Proceedings of 2006 International Symposium on Intelligent Signal Processing and Communication Systems 419-422 2006/12

  370. A Subpixel Image Matching Technique Using Phase-Only Correlation Peer-reviewed

    Sei Nagasima, Takafumi Aoki, Tatsuo Higuchi and Koji Kobayashi

    Proceedings of 2006 International Symposium on Intelligent Signal Processing and Communication Systems 701-704 2006/12

  371. A Dental Radiograph Registration Algorithm Using Phase-Based Image Matching for Human Identification Peer-reviewed

    Akira Nikaido, Koichi Ito, Takafumi Aoki, Eiko Kosuge, Ryota Kawamata

    Proceedings of 2006 International Symposium on Intelligent Signal Processing and Communication Systems 375-378 2006/12

  372. An Implementation-Oriented Iris Recognition Algorithm Using Phase-Based Image Matching Peer-reviewed

    A. Kazuyuki Miyazawa, Koichi Ito, Takafumi Aoki, Koji Kobayashi and Hiroshi Nakajima

    Proceedings of 2006 International Symposium on Intelligent Signal Processing and Communication Systems 231-234 2006/12

  373. Formal Design of Arithmetic Circuits Based on Arithmetic Description Language Peer-reviewed

    N. Homma, Y. Watanabe, T. Aoki, and T. Higuchi,

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E89-A (12) 3500-3509 2006/12

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1093/ietfec/e89-a.12.3500  

    ISSN: 0916-8508

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    This paper presents a formal design of arithmetic circuits using an arithmetic description language called ARITH. The key idea in ARITH is to describe arithmetic algorithms directly with high-level mathematical objects (i.e., number representation systems and arithmetic operations/formulae). Using ARITH, we can provide formal description of arithmetic algorithms including those using unconventional number systems. In addition, the described arithmetic algorithms can be formally verified by equivalence checking with formula manipulations. The verified ARITH descriptions are easily translated into the equivalent HDL descriptions. In this paper, we also present an application of ARITH to an arithmetic module generator, which supports a variety of hardware algorithms for 2-operand adders, multi-operand adders, multipliers, constant-coefficient multipliers and multiply accumulators. The language processing system of ARITH incorporated in the generator verifies the correctness of ARITH descriptions in a formal method. As a result, we can obtain highly-reliable arithmetic modules whose functions are completely verified at the algorithm level.

  374. Systematic interpretation of redundant arithmetic adders in binary and multiple-valued logic Peer-reviewed

    Naofumi Homma, Takafumi Aoki and Tatsuo Higuchi

    IEICE Transactions on Electronics E89-C (11) 1645-1654 2006/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8524

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    This paper presents an algorithm-level interpretation of fast adder structures in binary/multiple-valued logic. The key idea is to employ a unified representation of addition algorithms called Counter Tree Diagrams (CTDs). The use of CTDs makes it possible to describe and analyze addition algorithms at various levels of abstraction. A high-level CTD represents a network of coarse-grained components associated with multiple-valued logic devices, while a low-level CTD represents a network of primitive components directly mapped onto binary logic devices. The level of abstraction in circuit representation can be changed by decomposition of CTDs. We can derive possible variations of adder structures by decomposing a high-level CTD into low-level CTDs. This paper demonstrates the interpretation of redundant arithmetic adders based on CTDs. We first introduce an extension of CTDs to represent possible redundant arithmetic adders with limited carry propagation. Using the extended version of CTDs, we can classify the conventional adder structures including those using emerging devices into three types in a systematic way.

  375. High-resolution side-channel attack using phase-based waveform matching Peer-reviewed

    Naofumi Homma, Sei Nagashima, Yuichi Imai, Takafumi Aoki and Akashi Satoh

    Lecture Notes on Computer Science (Proceedings of Cryptographic Hardware and Embedded Systems 2006) 4249 187-200 2006/10

  376. An Iris Recognition System Using Phase-Based Image Matching Peer-reviewed

    Kazuyuki Miyazawa, Koichi Ito, Takafumi Aoki, Koji Kobayashi and Atsushi Katsumata

    Proceeding of the International Conference on Image Processing 2006 325-328 2006/10

  377. A Palmprint Recognition Algorithm Using Phase-Based Image Matching Peer-reviewed

    Koichi Ito, Takafumi Aoki, Hiroshi Nakajima, Koji Kobayashi and Tatsuo Higuchi

    Proceeding of the International Conference on Image Processing 2006 2669-2672 2006/10

  378. Design of a two-bit-per-cell content-addressable memory using single-electron transistors Peer-reviewed

    Katsuhiko Degawa, Takafumi Aoki, Tatsuo Higuchi, Hiroshi Inokawa and Yasuo Takahashi

    Journal of Multiple-Valued Logic and Soft Computing 45 (5A) 4285-4289 2006/05

  379. Algorithm-Level Interpretation of Fast Adder Structures in Binary and Multiple-Valued Logic Peer-reviewed

    Naofumi Homma, Takafumi Aoki and Tatsuo Higuchi

    Proceedings of the 36th International Symposium on Multiple-Valued Logic 2 2006/05

  380. A High-Density Ternary Content-Addressable Memory Using Single-Electron Transistors Peer-reviewed

    Katsuhiko Degawa, Takafumi Aoki, Tatsuo Higuchi, Hiroshi Inokawa, Katsuhiko Nishiguchi and Yasuo Takahashi

    Proceedings of the 36th International Symposium on Multiple-Valued Logic 19 2006/05

  381. Arithmatic Module Generator Based on Arithmatic Description Language Peer-reviewed

    Y. Watanabe, N. Homma, T. Aoki, T. Higuchi

    The 13th Workshop on Synthesis And System Integration of Mixed Information Technologies 153-160 2006/04

  382. A High-Density Content-Addressable Memory Using Single-Electron Transistors

    Katsuhiko Degawa,Takafumi Aoki, Tatsuo Higuchi, Hiroshi Inokawa and Yasuo Takahashi

    Proceedings of the International Symposium on Bio- and Nano-Electronics in Sendai 129-130 2006/03

  383. A Shortest Path Search Algorithm Using an Excitable Digital Reaction-Diffusion System Peer-reviewed

    Koichi Ito, Masahiko Hiratsuka, Takafumi Aoki and Tatsuo Higuchi

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Science E89-A (3) 735-743 2006/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8508

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    This paper presents a shortest path search algorithm using a model of excitable reaction-diffusion dynamics. In our previous work, we have proposed a framework of Digital Reaction-Diffusion System (DRDS)-a model of a discrete-time discrete-space reaction-diffusion system useful for nonlinear signal processing tasks. In this paper, we design a special DRDS, called an "excitable DRDS," which emulates excitable reaction-diffusion dynamics and produces traveling waves. We also demonstrate an application of the excitable DRDS to the shortest path search problem defined on two-dimensional (2-D) space with arbitrary boundary conditions.

  384. A High-Accuracy Passive 3D Measurement System Using Phase-Based Image Matching Peer-reviewed

    Mohammad Abdul Muquit, Takuma Shibahara, Takafumi Aoki

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E89-A (3) 686-697 2006/03

  385. A Fingerprint Matching Technique Based on Phase-Only Correlation : Algorithm Design and Implementation for Fingerprint Matching Devices Dedicated to Home Applications Peer-reviewed

    NAKAJIMA Hiroshi, KOBAYASHI Koji, MORIKAWA Makoto, KATSUMATA Atsushi, ITO Koichi, AOKI Takafumi, HIGUCHI Tatsuo

    The Journal of the Institute of Electrical Engineers of Japan 126 (2) 38-46 2006/02

    Publisher: The Institute of Electrical Engineers of Japan

    DOI: 10.1541/ieejsmas.126.38  

    ISSN: 1341-8939

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    A major approach for fingerprint recognition today is to extract minutiae from fingerprint images and to perform fingerprint matching based on the number of corresponding minutiae pairings. One of the most difficult problems in minutiae-based fingerprint recognition has been that the recognition performance is significantly influenced by fingertip surface condition, which may vary depending on environmental or personal causes. Addressing this problem, we have proposed an efficient fingerprint recognition algorithm using phase-based image matching. The use of phase components in 2D discrete Fourier transforms of fingerprint images makes possible to achieve highly robust fingerprint recognition for low-quality fingerprints. However, due to its high computational complexity, the proposed algorithm is not suitable to be implemented in compact fingerprint matching devices for home applications. In this paper, we propose an improved fingerprint recognition algorithm using phase-based image matching, which significantly reduces computational complexity without degrading recognition performance, compared with the reported algorithm. We also present prototype implementation of a high-performance, easy-to-use fingerprint matching device for home applications, which employ a specially designed ASIC for executing the proposed algorithm in real time.

  386. Formal design of decimal arithmetic circuits using arithmetic description language Peer-reviewed

    Yuki Watanabe, Naofumi Homma, Takafumi Aoki, Tatsuo Higuchi

    2006 INTERNATIONAL SYMPOSIUM ON INTELLIGENT SIGNAL PROCESSING AND COMMUNICATIONS, VOLS 1 AND 2 383-+ 2006

    DOI: 10.1109/ISPACS.2006.364918  

  387. Molecular-Mediated Single-Electron Devices Operating at Room Temperature Peer-reviewed

    Touichiro Goto, Katsuhiko Degawa, Hiroshi Inokawa, Kazuaki Furukawa,Hiroshi Nakashima, Koji Sumitomo, Takafumi Aoki and Keiichi Torimitsu

    Japanese Journal of Applied Physics 45 (5A) 4285-4289 2006

    DOI: 10.1143/JJAP.45.4285  

    ISSN: 0021-4922

  388. A multiplier module generator based on arithmatic description language Peer-reviewed

    Naofumi Homma, Yuki Watanabe, Kazuya Ishida, Takafumi Aoki, Tatsuo Higuchi

    Proceedings of the IP Based SoC Design Conference & Exhibition 207-212 2005/12

  389. A Phase-Based Iris Recognition Algorithm Peer-reviewed

    Kazuyuki Miyazawa, Koichi Ito, Takafumi Aoki, Koji Kobayashi

    Lecture Notes on Computer Science (Proceedings of the International Conference on Biometrics 2006) (3832) 356-365 2005/12

  390. A Fingerprint Recognition Algorithm Combining Phased-Based Image Matching and Feature-Based Matching Peer-reviewed

    Koichi Ito, Ayumi Morita, Takafumi Aoki, Hiroshi Nakajima, Koji Kobayashi, Tatuso Higuchi

    Lecture Notes on Computer Science (Proceedings of the International Conference on Biometrics 2006) (3832) 316-325 2005/12

  391. Fast and Robust Fingerprint Identification Algorithm and Its Application to Residential Access Control Products Peer-reviewed

    Hiroshi Nakajima, Koji Kobayashi, Makoto Mokoto Morikawa, Atsushi Katsumata, Koichi Ito, Takafumi Aoki, Tatsuo Higuchi

    Lecture Notes on Computer Science (Proceedings of the International Conference on Biometrics 2006) (3832) 326-333 2005/12

  392. A Phase-Based Iris Recognition Algorithm Peer-reviewed

    K. Miyazawa, K. Ito, T. Aoki, K. Kobayashi and H. Nakajima

    Lecture Notes in Computer Science: Proc. Int. Conf. Biometrics 2006 3832 356-365 2005/12

  393. Fast and Robust Fingerprint Identification Algorithm and Its Application to Residential Access Control Products Peer-reviewed

    H. Nakajima, K. Kobayashi, M. Morikawa, A. Katsumata, K. Ito, T. Aoki and T. Higuchi

    Lecture Notes in Computer Science: Proc. Int. Conf. Biometrics 2006 3832 326-333 2005/12

  394. A Fingerprint Recognition Algorithm Combining Phase-Based Image Matching and Feature-Based Matching Peer-reviewed

    K. Ito, A. Morita, T. Aoki, H. Nakajima, K. Kobayashi and T. Higuchi

    Lecture Notes in Computer Science: Proc. Int. Conf Biometrics 2006 3832 316-325 2005/12

  395. Finding the Shortest Path by Using an Excitable Digital Reaction-Diffusion System Peer-reviewed

    Koichi Ito, Masahiko Hiratsuka, Takafumi Aoki and Tatsuo Higuchi

    Proceedings of 2005 International Symposium on Nonlinear Theory and its Applications 226-229 2005/10

  396. Finding the Shortest Path by Using an Excitable Digital Reaction-Diffusion System Peer-reviewed

    K. Ito, M. Hiratsuka, T. Aoki and T. Higuchi

    Proc. the 2005 Int. Symp. Nonlinear Theory and its Applications 226-229 2005/10

  397. A Graph-Based Representation for Analyzing Fast Addition Algorithms Peer-reviewed

    Naofumi Homma, Takafumi Aoki and Tatsuo Higuchi

    Proceedings of the 7th International Symposium on Representations and Methodology of Future Computing Technologies 52-57 2005/09

  398. 3D Face Recognition Using Passive Stereo Vision Peer-reviewed

    N. Uchida, T. Shibahara, T. Aoki, H. Nakajima and K. Kobayashi

    Proc. the 2005 IEEE Int. Conf. Image Processing II-950-II-953 2005/09

  399. An Efficient Iris Recognition Algorithm Using Phase-Based Image Matching Peer-reviewed

    K. Miyazawa, K. Ito, T. Aoki, K. Kobayashi and H. Nakajima

    Proc. the 2005 IEEE Int. Conf. Image Processing II-49-II-52 2005/09

  400. A Fingerprint Recognition Algorithm Using Phase-Based Image Matching for Low-Quality Fingerprints Peer-reviewed

    K. Ito, A. Morita, T. Aoki, T. Higuchi, H. Nakajima and K. Kobayashi

    Proc. the 2005 IEEE Int. Conf. Image Processing 2 II-33-II-36 2005/09

  401. A Graph-Based Representation for Analyzing Fast Addition Algorithms Peer-reviewed

    N. Homma, T. Aoki and T. Higuchi

    Proc. the 7th Int. Symp. Representations and Methodology of Future COmputing Technologies 52-57 2005/09

  402. A Compact Cluster Computer with Embedded CPUs and Its Application to Rapid Prototyping of Fingerprint Verification System Peer-reviewed

    Y. Sasaki, K. Ito, T. Aoki and T. Higuchi

    IEICE Electronics Express 2 (17) 465-470 2005/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/elex.2.465  

    ISSN: 1349-2543

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    This paper presents a compact cluster computer, called "UCC (Ubiquitous Computing Cluster)", which provides a cost-effective prototyping environment for design and test of ubiquitous computing applications. We achieve extremely small size, low power consumption and low cost by employing COTS (Commercial Off-The-Shelf) embedded CPUs. We also present an application of UCC to fingerprint verification using phase-based image matching and its performance analysis. Our experimental observation shows that the cluster is useful for prototyping practical application programs targeted at network-connected embedded CPUs.

  403. Unsupervised Image Segmentation Based on Bethe Approximation Peer-reviewed

    F. Chen, T. Aoki and T. Horiguchi

    Interdisciplinary Information Sciences 11 (2) 127-139 2005/09

    Publisher: Tohoku University

    DOI: 10.4036/iis.2005.127  

    ISSN: 1340-9050

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    We propose an approach for unsupervised image segmentation based on the Markov random field by using the Bethe approximation. We first derive the Bayesian information criterion under the Bethe approximation and then propose an iterative algorithm to search a model which fits the image data best. For this aim, we derive a criterion for merging two components among several components in terms of a perturbation expansion. Namely, annihilation of components is implemented by merging two components into one component after each convergence of the supervised segmentation with a fixed number of components. We find by numerical experiments that the optimal number of components is selected from the series of local optima with different numbers of components and the best result for segmentation is obtained with good performance.

  404. Prototype Fabrication of Field-Programmable Digital Filter LSIs Using Multiple-Valued Current-Mode Logic --- Device Scaling and Future Prospects --- Invited Peer-reviewed

    K. Degawa, T. Aoki and T. Higuchi

    J. Multiple-Valued Logic and Soft Computing 11 (5月6日) 545-565 2005/08

  405. Design of Multiple-Valued Logic Circuits Using Graph-Bsed Evolutionary Synthesis Peer-reviewed

    M. Natsui, N. Homma, T. Aoki and T. Higuchi

    J. Multiple-Valued Logic and Soft Computing 11 (5月6日) 519-544 2005/08

  406. Multi-Valued Logic as a New Computing Paradigm --- A Brief Survey of Higuchi's Research on Multiple-Valued Logic Peer-reviewed

    M. Kameyama, T. Hanyu and T. Aoki

    J. Multiple-Valued Logic and Soft Computing 11 (5月6日) 407-436 2005/08

  407. Semi-Automatic Video Object Segmentation Using LVQ with Color and Spatial Features Peer-reviewed

    H. Mochamad, H.C. Loy and T. Aoki

    IEICE Trans. Information and Systems E88-D (7) 1553-1560 2005/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8532

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    This paper presents a semi-automatic algorithm for video object segmentation. Our algorithm assumes the use of multiple key video frames in which a semantic object of interest is defined in advance with human assistance. For video frames between every two key frames, the specified video object is tracked and segmented automatically using Learning Vector Quantization (LVQ). Each pixel of a video frame is represented by a 5-dimensional feature vector integrating spatial and color information. We introduce a parameter K to adjust the balance of spatial and color information. Experimental results demonstrate that the algorithm can segment the video object consistently with less than 2% average error when the object is moving at a moderate speed.

  408. A Two-Bit-per-Cell Content-Addressable Memory Using Single-Electron Transistors Peer-reviewed

    K. Degawa, T. Aoki, T. Higuchi, H. Inokawa and Y. Takahashi

    Proc. the 35th IEEE Int. Symp. Multiple-Valued Logic 32-38 2005/05

  409. Introduction: Special issue to recognize T. Higuchi's contributions to multiple-valued VLSI computing

    Michitaka Kameyama, Takahiro Hanyu, Takafumi Aoki

    Journal of Multiple-Valued Logic and Soft Computing 11 (5-6) i-ii 2005

    ISSN: 1542-3980

  410. A Multiplier Module Generator Based on Arithmetic Description Language Peer-reviewed

    N. Homma, Y. Watanabe, K. Ishida, T. Aoki and T. Higuchi

    Proc. the IP Based SoC Design Conf. & Exhibition 207-212 2004/12

  411. LVQ-Based Video Object Segmentation through Combination of Spatial and Color Features Peer-reviewed

    H. Mochamad, H.C. Loy and T. Aoki

    Proc. the 2004 IEEE region 10 Conf. 211-214 2004/11

  412. A Single-Electron-Transistor Logic Gate Family for Binary, Multiple-Valued and Mixed-Mode Logic Peer-reviewed

    K. Degawa, T. Aoki, T. Higuchi, H. Inokawa and Y. Takahashi

    IEICE Trans. Electronics E87-C (11) 1827-1836 2004/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8524

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    This paper presents a model-based study of SET (Single-Electron-Transistor) logic gate family for synthesizing binary, MV (Multiple-Valued) and mixed-mode logic circuits. The use of SETs combined with MOS transistors allows compact realization of basic logic functions that exhibit periodic transfer characteristics. The operation of basic SET logic gates is successfully confirmed through SPICE circuit simulation based on the physical device model of SETs. The proposed SET logic gates are useful for implementing binary logic circuits, MV logic circuits and binary-MV mixed-mode logic circuits in a highly flexible manner. As an example, this paper describes design of various parallel counters for carry-propagation-free arithmetic, where MV signals are effectively used to achieve higher functionality with lower hardware complexity.

  413. A Simulation Methodology for Single-Electron Multiple-Valued Logics and Its Application to a Latched Parallel Counter Peer-reviewed

    H. Inokawa, Y. Takahashi, K. Degawa, T. Aoki and T. Higuchi

    IEICE Trans. Electronics E87-C (11) 1818-1826 2004/11

    Publisher: Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8524

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    This paper introduces a methodology for simulating single-electron-transistor (SET)-based multiple-valued logics (MVLs). First, a physics-based analytical model for SET is described, and then a procedure for extracting parameters from measured characteristics is explained. After that, simulated and experimental results for basic MVL circuits are compared. As an advanced example of SET-based logics, a latched parallel counter, which is one of the most important components in arithmetic circuits, is newly designed and analyzed by a simulation. It is found that a SET-based 7-3 counter can be constructed with less than 1/10 the number of devices needed for a conventional circuit and can operate at a moderate speed with 1/100 the conventional power consumption.

  414. A Redox Microarray --- An Experimental Model for Molecular Computing Integrated Curcuits Peer-reviewed

    M. Hiratsuka, S. Ikeda, T. Aoki and T. Higuchi

    IEICE Trans. Electronics E87-C (11) 1804-1080 2004/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8524

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    An experimental model of a redox microarray, which provides a foundation for constructing future massively parallel molecular computers, is proposed. The operation of a redox microarray is confirmed, using an experimental setup based on an array of microelectrodes with analog integrated circuits.

  415. Arithmetic Description Language and Its Application to Parallel Multiplier Design Peer-reviewed

    N. Homma, K. Ishida, T. Aoki and T. Higuchi

    Proc. the 12th Synthesis And Sytem Integration of Mixed Information Technologies 319-326 2004/10

  416. Topology-Oriented Design of Current Mirrors Using Evolutionary Graph Generation Peer-reviewed

    M. Natsui, N. Homma, T. Aoki and T. Higuchi

    Proc. the 12th Synthesis And System Integration of Mixed Information Technologies 78-84 2004/10

  417. Topology-Oriented Design of Analog Circuits Based on Evolutionary Graph Generation Peer-reviewed

    M. Natsui, N. Homma, T. Aoki and T. Higuchi

    Lecture Notes in Computer Science: Proc. Parallel Problem Solving from Nature --- PPSN VIII 3242 342-351 2004/09

  418. Robust Motion Estimation for Video Sequences Based on Phase-Only Correlation Peer-reviewed

    H.C. Loy and T. Aoki

    Proc. the 6th IASTED Int. Conf. Signal and Image Processing 441-446 2004/08

  419. A Sub-Pixel Correspondence Search Technique for Computer Vision Applications Peer-reviewed

    K. Takita, M.A. Muquit, T. Aoki and T. Higuchi

    IEICE Trans. Fundamentals E87-A (8) 1913-1923 2004/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8508

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    This paper presents a technique for high-accuracy correspondence search between two images using Phase-Only Correlation (POC) and its performance evaluation in a 3D measurement application. The proposed technique employs (i) a coarse-to-fine strategy using image pyramids for correspondence search and (ii) a sub-pixel window alignment technique for finding a pair of corresponding points with sub-pixel displacement accuracy. Experimental evaluation shows that the proposed method makes possible to estimate the displacement between corresponding points with approximately 0.05-pixel accuracy when using 11 × 11-pixel matching windows. This paper also describes an application of the proposed technique to passive 3D measurement system.

  420. Experimental Observation of Active Wave Propagation in a Redox Microarray Peer-reviewed

    M. Hiratsuka, S. Ikeda, T. Aoki and T. Higuchi

    Proc. the 2004 Int. Technical Conf. Circuits/Systems, Computers and Communications 8D2L-6-1-8D2L-6-4 2004/06

  421. Evolutionary Graph Geneation System with Transmigration Capability and Its Application to Current Mirror Circuit Synthesis Peer-reviewed

    M. Natsui, N. Homma, T. Aoki and T. Higuchi

    Proc. the 2004 Int. Technical Conf. Circuits/Systems, Computers and Communications 8A2L-3-1-8A2L-3-4 2004/06

  422. Parallel Implementation of LVQ-Based Video Object Tracking Peer-reviewed

    N. Roy, H. Mochamad and T. Aoki

    Proc. the 2004 Int. Technical Conf. Circuits/Systems, Computers and Communications 7F3P-40-1-7F3P-40-4 2004/06

  423. A Multi-Camera 3D Measurement System Using a Phase-Only Correlation Technique and Its Performance Evaluation Peer-reviewed

    M.A. Muquit, K. Takita and T. Aoki

    Proc. the 2004 Int. Technical Conf. Circuits/Systems, Computers and Communications 7F3P-39-1-7F3P-39-4 2004/06

  424. Integrating Spatial and Color Features for LVQ-Based Video Object Segmentation Peer-reviewed

    H. Mohammad, H.C. Loy and T. Aoki

    Proc. the 2004 Int. Technical Conf. Circuits/Systems, Computers and Communications 7F3P38-1-7F3P-38-4 2004/06

  425. Design of an Excitable Digital Reaction-Diffusion System for Shortest Path Search Peer-reviewed

    K. Ito, T. Aoki and T. Higuchi

    Proc. the 2004 Int. Technical Conf. Circuits/Systems, Computers and Communications 7F3P-1-1-7F3P-1-4 2004/06

  426. Design and Evaluation of Field-Programmable Digital Filter LSIs Using Multiple-Valued urrent-Mode Logic Circuits Peer-reviewed

    K. Degawa, T. Kogure, T. Aoki and T. Higuchi

    Proc. the 2004 Int. Technical Conf. Circuits/Systems, Computers and Communications 7C1L-1-1-7C1L-1-4 2004/06

  427. Counter Tree Diagrams for Redundant Adder Design Peer-reviewed

    N. Homma, T. Wakamatsu, J. Sakiyama, T. AOki and T. Higuchi

    Proc. the 2004 Int. Technical Conf. Circuits/Systems, Computers and Communications 6C3L-2-1-6C3L-2-4 2004/06

  428. Multiplier Block Systhesis Using Evolutionary Graph Generation Peer-reviewed

    N. Homma, T. Aoki and T. Higuchi

    Proc. the 2004 NASA/DoD Conf. Evolvable Hardware 79-82 2004/06

  429. A Systematic Approach for Analyzing Fast Addision Algorithms Using Counter Tree Diagrams Peer-reviewed

    N. Homma, J. Sakiyama, T. Wakamatsu, T. Aoki and T. Higuchi

    Proc. the 2004 Int. Symp. Circuits and Systems V-197-V-200 2004/05

  430. Design and Verification of Parallel Multipliers Using Arithmetic Description Language: ARITH Peer-reviewed

    K. Ishida, N. Homma, T. Aoki and T. Higuchi

    Proc. the 34 th IEEE Int. Symp. Multiple-Valued Logic 334-339 2004/05

  431. A Single-Electron-Transistor Logic Gate Family and Its Application --- Part II: Design and Simulation of a 7-3 Parallel Counter with Linear Summation and Multiple-Valued Latch Functions Peer-reviewed

    H. Inokawa, Y. Takahashi, K. Degawa, T. Aoki and T. Higuchi

    Proc. the 34th IEEE Int. Symp. Multiple-Valued Logic 269-274 2004/05

  432. A Single-Electron-Transistor Logic Gate Family and Its Application --- Part I: Basic Components for Binary, Multiple-Valued and Mixed-Mode Logic Peer-reviewed

    K. Degawa, T. Aoki, T. Higuchi, H. Inokawa and Y. Takahashi

    Proc. the 34th IEEE Int. Symp. Multiple-Valued Logic 262-268 2004/05

  433. Graph-Based Approach for Synthesizing Arithmetic Circuits Invited

    N. Homma, M. Natsui, T. Aoki and T. Higuchi

    Proc.13th Int. Workshop on Post-Binary ULSI Systems 25-32 2004/05

  434. Counter Tree Diagramに基づく冗長加算器の系統的設計手法 --- 冗長2進加算器設計の例 Peer-reviewed

    本間尚文, 崎山淳, 若松泰平, 青木孝文, 樋口龍雄

    情報処理学会論文誌 45 (5) 1279-1288 2004/05

  435. A Fingerprint Matching Algorithm Using Phase-Only Correlation Peer-reviewed

    K. Ito, H. Nakajima, K. Kobayashi, T. Aoki and T. Higuchi

    IEICE Trans. Fundamentals E87-A (3) 682-691 2004/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8508

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    This paper presents an algorithm for fingerprint matching using the Phase-Only Correlation (POC) function. One of the most difficult problems in human identification by fingerprints has been that the matching performance is significantly influenced by fingertip surface condition, which may vary depending on environmental or personal causes. This paper proposes a new fingerprint matching algorithm using phase spectra of fingerprint images. The proposed algorithm is highly robust against fingerprint image degradation due to inadequate fingertip conditions. A set of experiments is carried out using fingerprint images captured by a pressure sensitive fingerprint sensor. The proposed algorithm exhibits efficient identification performance even for difficult fingerprint images that could not be identified by the conventional matching algorithms.

  436. Evolutionary Synthesis of Arithmetic Circuit Structures Invited Peer-reviewed

    T. Aoki, N. Homma and T. Higuchi

    Artificial Intelligence Review 20 (3月4日) 199-232 2004/03

  437. VLSI Circuit Design Using an Object-Oriented Framework of Evolutionary Graph Generation System Peer-reviewed

    N. Homma, M. Natsui, T. Aoki and T. Higuchi

    Proc. 2003 Congress on Evolutionary Computation 115-122 2003/12

  438. Evolutionary Graph Generation System and Its Application to MOS Current Mirror Synthesis Peer-reviewed

    M. Natsui, N. Homma, T. Aoki and T. Higuchi

    Proc. 2003 IEEE Int. Symp. Intelligent Signal Processing and Communication Systems 747-752 2003/12

  439. Counter Tree Diagrams: A Unified Framework for Analyzing Fast Addition Algorithms Peer-reviewed

    J. Sakiyama, N. Homma, T. Aoki and T. Higuchi

    IEICE Trans. Fundamentals E86-A (12) 3009-3019 2003/12

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8508

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    This paper presents a unified representation of fast addition algorithms based on Counter Tree Diagrams (CTDs). By using CTDs, we can describe and analyze various adder architectures in a systematic way without using specific knowledge about underlying arithmetic algorithms. Examples of adder architectures that can be handled by CTDs include Redundant-Binary (RB) adders, Signed-Digit (SD) adders, Positive-Digit (PD) adders, carry-save adders, parallel counters (e.g., 3-2 counters and 4-2 counters) and networks of such basic adders/counters. This paper also discusses the CTD-based analysis of carry-propagation-free adders using various number representations.

  440. Design of a Field-Programmable Digital Filter Chip Using Multiple-Valued Current-Mode Logic Peer-reviewed

    K. Degawa, T. Aoki and T. Higuchi

    IEICE Trans. Fundamentals E86-A (8) 2001-2010 2003/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8508

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    This paper presents a Field-Programmable Digital Filter (FPDF) IC that employs carry-propagation-free redundant arithmetic algorithms for faster computation and multiple-valued current-mode circuit technology for high-density low-power implementation. The original contribution of this paper is to evaluate, through actual chip fabrication, the potential impact of multiple-valued current-mode circuit technology on the reduction of hardware complexity required for DSP-oriented programmable ICs. The prototype FPDF fabrication with 0.6μm CMOS technology demonstrates that the chip area and power consumption can be reduced to 41% and 71%, respectively, compared with the standard binary logic implementation.

  441. High-Accuracy Subpixel Image Registration Based on Phase-Only Correlation Invited Peer-reviewed

    K. Takita, T. Aoki, Y. Sasaki, T. Higuchi and K. Kobayashi

    IEICE Trans. Fundamentals E86-A (8) 1925-1934 2003/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8508

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    This paper presents a high-accuracy image registration technique using a Phase-Only Correlation (POC) function. Conventional techniques of phase-based image registration employ heuristic methods in estimating the location of the correlation peak, which corresponds to image displacement. This paper proposes a technique to improve registration performance by fitting the closed-form analytical model of the correlation peak to actual two-dimensional numerical data. This method can also be extended to a spectrum weighting POC technique, where we modify cross-phase spectrum with some weighting functions to enhance registration accuracy. The proposed method makes possible to estimate image displacements with 1/100-pixel accuracy.

  442. Fingerprint Resotration Using Digital Reaction-Diffusion System and Its Evaluation Peer-reviewed

    K. Ito, T. Aoki and T. Higuchi

    IEICE Trans. Fundamentals E86-A (8) 1916-1924 2003/08

  443. Implementation of a Redox Microarray: An Experimental Model for Future Nanoscale Biomolecular Computing Using Integrated Circuits Peer-reviewed

    M. Hiratsuka, T. Aoki, H. Morimitsu and T. Higuchi

    IEEE Proc. -- Nanobiotechnology 150 (1) 9-14 2003/06

  444. A Framework of Evolutionary Graph Generation system and Its Application to Circuit Synthesis Peer-reviewed

    N. Homma, T. Aoki, M. Motegi and T. Higuchi

    Proc. the 2003 IEEE Int. Symp. Circuits and Systems V-201-V-204 2003/05

  445. Design of a Digital Reaction-Diffusion System for Restoring Blurred Fingerprint Images Peer-reviewed

    K. Ito, T. Aoki and T. Higuchi

    Proc. the 2003 IEEE Int. Symp. Circuits and Systems IV-77-IV-80 2003/05

  446. A Field-Programmable Digital Filter Chip Using Multiple-Valued Current-Mode Logic Peer-reviewed

    K. Degawa, T. Aoki and T. Higuchi

    Proc. the 33rd IEEE Int. Symp. Multiple-Valued Logic 213-220 2003/05

  447. Counter Tree Diagrams for Design and Analysis of Fast Addition Algorithms Peer-reviewed

    J. Sakiyama, T. Aoki and T. Higuchi

    Proc. the 33rd IEEE Int. Symp. Multiple-Valued Logic 91-98 2003/05

  448. Counter Tree Diagrams --- A Unified Representation of Fast Addition Algorithms --- Peer-reviewed

    J. Sakiyama, T. Aoki and T. Higuchi

    J. Multiple-Valued Logic and Soft Computing 9 (1) 87-108 2003/03

  449. Toward Molecular Computing Using Artificial Catalyst Devices Peer-reviewed

    M. Hiratsuka, H. Morimitsu, T. Aoki and T. Higuchi

    Proc. 2002 Int. Symp. New Paradigm VLSI Computing 121-124 2002/12

  450. Phase-Based Image Matching and Its Application to Intelligent Vision Systems Peer-reviewed

    T. Aoki, K. Takita, T. Higuchi and K. Kobayashi

    Proc. 2002 Int. Symp. New Paradigm VLSI Computing 95-100 2002/12

  451. Evolutionary Synthesis of Circuit Structures Peer-reviewed

    N. Homma, T. Aoki and T. Higuchi

    Proc. 2002 Int. Symp. New Paradigm VLSI Computing 48-51 2002/12

  452. Pixel-Wise Human Motion Segmentation Using Learning Vector Quantization Peer-reviewed

    M. Hariadi, A. Harada, T. Aoki and T. Higuchi

    Proc. the 7th Int. Conf. Control, Automation, Robotics and Vision 1439-1444 2002/12

  453. Fingerprint Restoration Using Digital Reaction-Diffusion System Peer-reviewed

    K. Ito, T. Aoki and T. Higuchi

    Proc. the 2002 IEEE Int. Symp. Intelligent Signal Processing and Communication Systems 168-172 2002/11

  454. High-Accuracy Passive 3D Measurement Using Multi-Camera System Based on Phase-Only Correlation Peer-reviewed

    M.A. Muquit, K. Takita, T. Aoki and T. Higuchi

    Proc. the 2002 IEEE Int. Symp. Intelligent Signal Processing and Communication Systems 91-95 2002/11

  455. High-Accuracy Image Registration Based on Phase-Only Correlation and Its Experimental Evaluation Peer-reviewed

    K. Takita, T. Aoki, Y. Sasaki, T. Higuchi and K. Kobayashi

    Proc. the 2002 IEEE Int. Symp. Intelligent Signal Processing and Communication Systems 86-90 2002/11

  456. An LVQ-Based Technique for Human Motion Segmentation Peer-reviewed

    M. Hariadi, A. Harada, T. Aoki and T. Higuchi

    Proc. the 2002 IEEE Asia-Pacific Conf. Circuits and Systems 171-176 2002/10

  457. Evolutionary Graph Generation System and Its Application to Bit-Serial Arithmetic Circuit Synthesis Peer-reviewed

    M. Motegi, N. Homma, T. Aoki and T. Higuchi

    Lecture Notes in Computer Science: Proc. Parallel Problem Solving from Nature -- PPSN VII 2439 831-840 2002/09

  458. Parallel Evolutionary Graph Generation with Terminal-Color Constraint and Its Application to Current-Mode Logic Circuit Design Peer-reviewed

    M. Natsui, T. Aoki and T. Higuchi

    IEICE Trans. Fundamentals E85-A (9) 2061-2071 2002/09

  459. Multiple-Valued Data Recovery Techniques for Band-Limited Channels in VLSI Peer-reviewed

    Y. Yuminaka, T. Morishita, T. Aoki and T. Higuchi

    Porc. the 32nd IEEE Int. Symp. Multiple-Valued Logic 54-60 2002/05

  460. Parallel Evolutionary Graph Generation on a PC Cluster and Its Application to Multiple-Valued Circuit Synthesis Peer-reviewed

    M. Natsui, T. Aoki and T. Higuchi

    Proc. the 32nd IEEE Int. Symp. Multiple-Valued Logic 96-102 2002/05

  461. Graph-Based Individual Representation for Evolutionary Synthesis of Arithmetic Circuits Peer-reviewed

    N. Homma, T. Aoki and T. Higuchi

    Proc. the 2002 Congress on Evolutionary Computation 1492-1497 2002/05

  462. Evolutionary Graph Generation System with Transmigration Capability and Its Application to Arithmetic Circuit Synthesis Peer-reviewed

    N. Homma, T. Aoki and T. Higuchi

    IEE Proc. --Circuits, Devices and Systems 149 (2) 97-104 2002/04

  463. Graph-Based Evolutionary Design of Arithmetic Circuits Peer-reviewed

    D. Chen, T. Aoki, N. Homma, T. Terasaki and T. Higuchi

    IEEE Trans. Evolutionary Computation 6 (1) 86-100 2002/02

  464. Parallel Evolutionary Design of Constant-Coefficient Multipliers Peer-reviewed

    D. Chen, T. Aoki, N. Homma and T. Higuchi

    IEICE Trans. Fundamentals E85-A (2) 508-512 2002/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8508

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    We introduce PC Linux cluster computing techniques to an Evolutionary Graph Generation (EGG) system, and successfully implement the parallel version of the EGG system, called PEGG. Our survey satisfactorily shows that the parallel evolutionary approach meets our expectation that the final solutions obtained from PEGG will be as good as or better than those obtained from EGG, and that PEGG can ultimately improve the speed of evolution.

  465. Implementation of Reaction-Diffusion Cellular Automata Peer-reviewed

    M. Hiratsuka, T. Aoki, H. Morimitsu and T. Higuchi

    IEEE Trans. Circuits and Systems--I 49 (1) 10-16 2002/01

  466. Pragmatic Method for the Design of Fast Constant-Coefficient Combinational Multipliers Peer-reviewed

    D. Chen, T. Aoki, N. Homma and T. Higuchi

    IEE Proc. -Computers and Digital Techniques 148 (6) 196-206 2001/11

  467. Logic Circuit Synth Evolutionary Graph Generation System with Terminal-Color Constraint -- An Application to Multiple-Valued esis -- Peer-reviewed

    M. Natsui, T. Aoki and T. Higuchi

    IEICE Trans. Fundamentals E84-A (11) 2808-2810 2001/11

  468. Design of High-Radix VLSI Dividers without Quotient Selection Tables Peer-reviewed

    T. Aoki, K. Nakazawa and T. Higuchi

    IEICE Trans. Fundamentals E84-A (11) 2623-2631 2001/11

  469. Experimental Observation of Active Wave Propagation in Reaction-Diffusion Cellular Automata Peer-reviewed

    H. Morimitsu, M. Hiratsuka, T. Aoki and T. Higuchi

    Proc. 2001 Int. Symp. Nonlinear Theory and its Applications 2 517-520 2001/10

  470. Digital Reaction-Diffusion System and Its Application Peer-reviewed

    K. Ito, T. Aoki and T. Higuchi

    Proc. 2001 Int. Symp. Nonlinear Theory and its Applications 1 99-102 2001/10

  471. Design of Constant-Coefficient Multipliers Peer-reviewed

    D. Chen, T. Aoki, N. Homma and T. Higuchi

    Proc. 2001 4th Int. Conf. ASIC 416-419 2001/10

  472. Distributed Evolutionary Design of Constant-Coefficient Multipliers Peer-reviewed

    D. Chen, T. Aoki and T. Higuchi

    Proc. The 8th IEEE Int. Conf. Electronics, Circuits and Systems 1 249-252 2001/09

  473. A Model for Biomolecular Computing Using Enzyme Transistors Peer-reviewed

    M. Hiratsuka, T. Aoki and T. Higuchi

    Interdisciplinary Information Sciences 7 (2) 259-278 2001/09

    Publisher: Tohoku University

    DOI: 10.4036/iis.2001.259  

    ISSN: 1340-9050

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    This paper explores the possibility of constructing massively parallel computing systems using molecular electronics technology. By employing specificity of biological molecules, such as enzymes, new integrated circuit architectures which are essentially free from interconnection problems could be constructed. To clarify the proposed concept, this paper presents a functional model of a molecular electronic device called an enzyme transistor. Using enzyme transistors, various wire-free computing circuits can be realized. Examples described in this paper include basic analog amplifiers and digital logic circuits. This paper also demonstrates the potential of enzyme transistors for creating reaction-diffusion dynamics that performs useful computations in a massively parallel fashion. Prominent examples discussed in this paper are: (i) Turing pattern formation and (ii) excitable wave propagation in a two-dimensional enzyme transistor system.

  474. Formal Definition of the Functional Verification Procedure for Arithmetic Description Language: ARITH Peer-reviewed

    M. Sekine, T. Aoki and T. Higuchi

    Proc. The Second Korea-Japan Joint Symp. Multiple-Valued Logic 162-165 2001/08

  475. Counter Tree Diagrams for Fast Addition Algorithms Peer-reviewed

    J. Sakiyama, T. Aoki and T. Higuchi

    Proc. The Second Korea-Japan Joint Symp. Multiple-Valued Logic 36-39 2001/08

  476. Digital Reaction-Diffusion System --- A Foundation of Bio-Inspired Texture Image Processing Peer-reviewed

    K. Ito, T. Aoki and T. Higuchi

    IEICE Trans. Fundamentals E84-A (8) 1909-1918 2001/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8508

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    This paper presents a digital reaction-diffusion system (DRDS)-a model of a discrete-time discrete-space reaction-diffusion dynamical system-for designing new image processing algorithms inspired by biological pattern formation phenomena. The original idea is based on the Turing's model of pattern formation which is widely known in mathematical biology. We first show that the Turing's morphogenesis can be understood by analyzing the pattern forming property of the DRDS within the framework of multidimensional digital signal processing theory. This paper also describes the design of an adaptive DRDS for image processing tasks, such as enhancement and restoration of fingerprint images.

  477. Evolutionary Graph Generation with Terminal-Color Constraint for Heterogeneous Circuit Synthesis Peer-reviewed

    M. Natsui, T. Aoki and T. Higuchi

    Electronics Letters 37 (13) 808-810 2001/06

  478. Synthesis of Multiple-Valued Arithmetic Circuits Using Evolutionary Graph Generation Peer-reviewed

    M. Natsui, T. Aoki and T. Higuchi

    Proc. 31st IEEE Int. Symp. on Multiple-Valued Logic 253-258 2001/05

  479. A Model of Reaction-Diffusion Cellular Automata for Massively Parallel Molecular Computing Peer-reviewed

    M. Hiratsuka, T. Aoki and T. Higuchi

    Proc. 31st IEEE Int. Symp. Multiple-Valued Logic 247-252 2001/05

  480. Evolutionary Graph Generation System with Transmigration Capability for Arithmetic Circuit Design Peer-reviewed

    Nuofumi Homma, Tukufumi Aoki, Tutsuo Higuchi

    Proc. the IEEE Int. Symp. Circuits and Systems 5 V171-V174 2001/05

    Publisher: IEEE Computer Society

    DOI: 10.1109/iscas.2001.922012  

  481. Evolutionary Synthesis of Bit-Serial Arithmetic Circuits Peer-reviewed

    T. Terasaki, T. Aoki and T. Higuchi

    Proc. 2000 IEEE International Symposium on Intelligent Signal Processing and Communication Systems 42 (4) 975-982 2001/04

  482. Evolutionary Design for High-Speed Constant-Coefficient Multipliers Peer-reviewed

    D. Chen, T. Aoki, N. Homma, T. Higuchi

    Electronics Letters 37 (4) 256-258 2001/02

  483. Reaction-Diffusion Cellular Automaton using Integrated Microelectrode Peer-reviewed

    M. Hiratsuka, T. Aoki and T. iguchi

    Electronics Letter 37 (2) 87-89 2001/01

  484. Evolutionary Synthesis of Sequential Arithmetic Circuits Peer-reviewed

    T.Terasaki, T. Aoki and T. Higuchi

    Proc. 2000 IEEE Int. Symp. Intelligent Signal Processing and Communication Systems (ISPACS) 1067-1072 2000/11

  485. Implementation of a 1-D Reaction-Diffusion Cellular Automaton Peer-reviewed

    M. Hiratsuka, T. Aoki and T. Higuchi

    Abstract of Int. Conf. Dynamical Aspects of Complex Systems 24 2000/11

  486. Evolutionary Synthesis of Fast Constant-Coefficient Multipliers Peer-reviewed

    N. Homma, T. Aoki and T. Higuchi

    IEICE Trans. Fundamentals E83-A (9) 1767-1777 2000/09

  487. Active Wave Propagation in a Reaction-Diffusion Cellular Automaton Using a Microelectrode Array Peer-reviewed

    M. Hiratsuka, T. Aoki and T. Higuchi

    Porc. 2000 Int. Symp. Nonlinear Theory and its Application (1) 319-322 2000/09

  488. Radix-2-4-8 CORDIC for Fast Vector Rotation Peer-reviewed

    T.Aoki, I. Kitaori and T. Higuchi

    IEICE Trans. Fundamentals E83-A (6) 1106-1114 2000/06

  489. Evolutionary Graph Generation System with Symbolic Verification for Arithmetic Circuit Design Peer-reviewed

    N. Homma, T. Aoki and T. Higuchi

    Electronics letters 36 (11) 937-939 2000/05

  490. Beyond-Binary Arithmetic --- Algorithms and Implementations --- Peer-reviewed

    T. Aoki and T. Higuchi

    Extended Abstracts of the 9th Int. Workshop on Post-Binary Ultra-Large-Scale Integration Systems 7-10 2000/05

  491. An Efficient Data Transmission Technique for VLSI System Based on Multiple-Valued Code-Division Multiple Access Peer-reviewed

    Y. Yuminaka, O. Katoh, Y. Sasaki, T. Aoki and T. Higuchi

    Proc. 30th IEEE Int. Symp. on Multiple-Valued Logic 430-437 2000/05

  492. High-Radix Parallel VLSI Dividers without Using Quotient Digit Selection Tables Peer-reviewed

    T. Aoki, K. Nakazawa and T. Higuchi

    Proc 30th IEEE Int. Symp. Multiple-Valued Logic 345-352 2000/05

  493. Beyond-Binary Arithmetic: Algorithm and VLSI Implementations Peer-reviewed

    T. Aoki and T. Higuchi

    Interdisciplinary Information Sciences 6 (1) 75-98 2000/03

  494. Evolutionary Generation of Constant-Coefficient Multipliers Peer-reviewed

    N. Homma, T. Aoki and T. Higuchi

    Proc. 1999 IEEE Int. Symp. Intelligent Signal Processing and Communication Systems 481-484 1999/12

  495. A Digital Reaction-Diffusion System for Texture Image Processing Peer-reviewed

    W. Fujita, T. Aoki and T. Higuchi

    Proc. 1999 IEEE Int. Symp. Intelligent Signal Processing and Communication Systems 113-116 1999/12

  496. A New Evolutionary Approach for Synthesizing Circuit Structures Peer-reviewed

    N. Homma, T. Aoki and T. Higuchi

    Proc. 1999 Int. Symp. Nonlinear Theory and its Applications 1 239-242 1999/11

  497. Pattern Formation in Reaction-Diffusion Enzyme Transistor Circuits Peer-reviewed

    M. Hiratsuka, T. Aoki and T. Higuchi

    IEICE Trans. Fundamentals E82-A (9) 1809-1817 1999/09

  498. A Code-Division Multiplexing Technique for Efficient Data Transmission in VLSI Systems Peer-reviewed

    Y. Yuminaka, K. Itoh, Y. Sasaki, T. Aoki and T. Higuchi

    IEICE Trans. Electronics E82-C (9) 1669-1677 1999/09

  499. Signed-Weight Arithmetic and Its Application to a Field-Programmable Digital Filter Architecture Peer-reviewed

    T. Aoki, Y. Sawada and T. Higuchi

    IEICE Trans. Electronics E82-C (9) 1687-1698 1999/09

  500. Radix-2-4-8 CORDIC for Fast Sine and Cosine Computation Peer-reviewed

    I. Kitaori, T. Aoki and T. Higuchi

    Proc. 1999 Int. Technical Conf. Circuits/Systems, Computers and Communications 462-465 1999/07

  501. Redundant complex arithmetic and its application to complex multiplier design Peer-reviewed

    Takafumi Aoki, Ken-ichi Hoshi and Tatsuo Higuchi

    Proceedings of the 29th International Symposium on Multiple-Valued Logic 200-207 1999/05

  502. Evolutionary Design of Arithmetic Circuits Peer-reviewed

    T. Aoki, N. Homma and T. Higuchi

    IEICE Trans. Fundamentals E82-A (5) 798-806 1999/05

  503. Redundant Complex Arithmetic and Its Application to Complex Multiplier Design Peer-reviewed

    T. Aoki, K. Hoshi and T. Higuchi

    Proc. 29th Int. Symp. on Multiple-Valued Logic 200-207 1999/05

  504. Evolutionary Graph Generation System for Arithmetic Circuit Design Peer-reviewed

    N. Homma, T. Aoki and T. Higuchi

    Proc. Int. Symp. Future of Intellectual Integrated Electronics 355-364 1999/03

  505. Beyond-Binary Arithmetic Algorithms Peer-reviewed

    T. Aoki and T. Higuchi

    Proc. Int. Symp. Future of Intellectual Integrated Electronics 333-353 1999/03

  506. Enzyme Transistor Circuits for Reaction-Diffusion Computing Peer-reviewed

    M. Hiratsuka, T. Aoki and T. Higuchi

    IEEE Trans. Circuits and Systems-I 46 (2) 294-303 1999/02

  507. Set-Valued Logic Architecture Using Pseudo-Noise Sequences Peer-reviewed

    AOKI Takafumi, NAKANISHI Takashi, HIGUCHI Tatsuo

    The Transactions of the Institute of Electronics,Information and Communication Engineers. J81-D-I (11) 1163-1170 1998/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0915-1915

  508. Design of Arithmetic Circuits Based on Evolutionary Graph Generation Peer-reviewed

    N. Homma, T. Aoki and T. Higuchi

    Proc. Workshop on Synthesis and Systems Integration of Mixed Technologies 31-38 1998/10

  509. Pattern Formation in Enzyme Transistor Circuits with Diffusive Coupling Peer-reviewed

    M. Hiratsuka, T. Aoki and T. Higuchi

    Proc. 1998 Int. Symp. Nonlinear Theory and Its Applications 1 351-354 1998/09

  510. Enzyme Transistor Circuits Peer-reviewed

    T. Aoki, M. Hiratsuka and T. Higuchi

    IEE Proc. -Circuits and Devices Syst. 145 (4) 264-270 1998/08

  511. A Model for Biomolecular Computing Peer-reviewed

    T. Aoki, M. Hiratsuka and T. Higuchi

    Proc. 1998 Int. Workshop on Advanced LSIs 39-44 1998/07

  512. Wave-Parallel Computing Systems Using Multiple-Valued Pseudo-Orthogonal Sequences Peer-reviewed

    Y. Yuminaka, Y. Sasaki, T. Aoki and T. Higuchi

    Proc. 28th Int. Symp. Multiple-Valued Logic 148-153 1998/05

  513. Set-Valued Logic Circuits for Next Generation VLSI Architectures Peer-reviewed

    T. Aoki and T. Higuchi

    Proc. 28th Int. Symp. Multiple-Valued Logic 140-147 1998/05

  514. 高基数CORDICアルゴリズム Peer-reviewed

    青木孝文, 野木均, 樋口龍雄

    電子情報通信学会 J81-D-I (4) 359-367 1998/04

  515. Design of Neural Networks Based on Wave-Parallel Computing Technique Peer-reviewed

    Y. Yuminaka, Y. Sasaki, T. Aoki and T. Higuchi

    Analog Integrated Circuits and Signal Processing 15 (3) 315-327 1998/03

  516. Frequency-Mode Set-Valued Logic for Wave-Parallel Computing Peer-reviewed

    Y. Yuminaka, T. Aoki and T. Higuchi

    Multiple-Valued Logic 3 (4) 301-332 1998

  517. Multiplex Computing System Based on Set-Valued Logic Peer-reviewed

    T. Higuchi and T. Aoki

    Computer & Electrical Engineering 23 (6) 381-392 1997/11

  518. High-Radix CORDIC Algorithm for VLSI Signal Processing Peer-reviewed

    T. Aoki, H. Nogi and T. Higuchi

    Proc. 1997 IEEE Workshop on Signal Processing Systems 183-192 1997/11

  519. 冗長複素数系に基づく実数/複素数再構成型算術演算回路の構成 Peer-reviewed

    青木孝文,天田博章,樋口龍雄

    電子情報通信学会論文誌 J80-D-I (8) 674-682 1997/08

  520. Design and Anlysis of Multiwave Interconnection Networks for MCM-Based Parallel Processing Peer-reviewed

    T. Aoki, S. Shionoya and T. Higuchi

    IEICE Trans. Electronics E80-C (7) 935-940 1997/07

  521. Real/Complex Reconfigurable Arithmetic Using Redundant Complex Number Systems Peer-reviewed

    T. Aoki, H. Amada and T. Higuchi

    Proc. 13th IEEE Symp. Computer Arithmetic 200-207 1997/07

  522. Enzyme Transistor Circuits for Biomolecular Computing Peer-reviewed

    M. Hiratsuka, T. Aoki and T. Higuchi

    Proc. 27th IEEE Int. Symp. Multiple-Valued Logic 47-52 1997/05

  523. Wave-Parallel Neural Networks Using Orthogonal Sequenses Peer-reviewed

    Y.Yuminaka, Y. Sasaki, T. Aoki and T. Higuchi

    IEE Electronics Letters 33 (8) 690-691 1997/04

  524. High-Radix Parallel Dividers for VLSI Signal Processing Peer-reviewed

    T. Aoki, H. Tokoyo and T. Higuchi

    Proc. IEEE Workshop on VLSI Signal Processing IX 83-92 1996/10

  525. A Multiplex Computing Paradigm Peer-reviewed

    T. Higuchi and T. Aoki

    Proc. 4th Int. Conf. Soft Computing 1 95-100 1996/09

  526. 光ウェ-ブキャスティングに基づく並列コンピュ-ティングア-キテクチャ Peer-reviewed

    青木孝文,桜井賢,樋口龍雄

    電子情報通信学会論文誌 J79-D-I (7) 437-445 1996/07

  527. 商選択テ-ブルを用いない高基数除算器の構成 Peer-reviewed

    青木孝文,常世大史,樋口龍雄

    電子情報通信学会論文誌 J79-D-I (7) 416-424 1996/07

  528. Redundant Complex Arithmetic Peer-reviewed

    T. Aoki and T. Higuchi

    Proc. 1996 Int. Technical Conf. Circuits/Systems, Computers and Communications II 1230-1233 1996/07

  529. 酵素トランジスタ回路の解析と設計 Peer-reviewed

    青木孝文,平塚眞彦,樋口龍雄

    電子情報通信学会論文誌 J-79A (5) 1073-1081 1996/05

  530. Wave-Parallel Computing Technique for Neural Networks Based on Amplitude-Modulated Waves Peer-reviewed

    Y. Yuminaka, Y. Sasaki, T. Aoki and T Higuchi

    Proc 26th IEEE Int. Symp. Multiple-Valued Logic 210-215 1996/05

  531. Multiwave Optical Interconnection

    Aoki Takafumi, Higuchi Tatsuo

    The Journal of Japan Institute for Interconnecting and Packaging Electronic Circuits 12 (2) 24-29 1996

    Publisher: The Japan Institute of Electronics Packaging

    DOI: 10.5104/jiep1993.12.2_24  

    ISSN: 0919-4398

  532. A Model of Enzyme Transistors Peer-reviewed

    M. Hiratsuka, T. Aoki and T. Higuchi

    Extended Abstracts of 5th Int. Symp. Bioelectronic and Molecular Electronic Devices 79-80 1995/11

  533. Redundant Complex Number Arithmetic for High-Speed Signal Processing Peer-reviewed

    T. Aoki, Y. Ohi and T. Higuchi

    Proc. IEEE Workshop on VLSI Signal Processing VIII 523-532 1995/10

  534. Multiwave Interconnection Networks for MCM-Based Parallel Processing Peer-reviewed

    S. Shionoya, T. Aoki and T. Higuchi

    Lecture Notes in Computer Science: Proc. EURO-PAR Conf. '95 Parallel Processing 966 593-607 1995/08

  535. Redundant Complex Number Systems Peer-reviewed

    Y. Ohi, T. Aoki and T. Higuchi

    Proc. 25th IEEE Int. Symp. Multiple-Valued Logic 14-19 1995/05

  536. Wire-Free Computing Circuits Using Optical Wave-Casting Peer-reviewed

    S. Sakurai, T. Aoki and T. Higuchi

    Proc. 25th IEEE Int. Symp. Multiple-Valued Logic 8-13 1995/05

  537. Set-Valued Logic for Multiplex Computing: Toward New-Device-Based Superchips Peer-reviewed

    T. Aoki and T. Higuchi

    Interdisciplinary Information Sciences 1 (1) 1-18 1994/11

  538. Design of Multiplex Interconnection Networks for Massively Parallel Computing Systems Peer-reviewed

    T. Takimoto, T. Aoki and T. Higuchi

    Proc. 24th IEEE Int. Symp. Multiple-Valued Logic 231-238 1994/05

  539. Design of Multiwave Computing Circuits Based on a Model of Integrated Opto-Electronic Devices Peer-reviewed

    Y. Watanabe, T. Aoki and T. Higuchi

    Proc. 24th IEEE Int. Symp. Multiple-Valued Logic 215-222 1994/05

  540. Design of Wave-Parallel Computing Circuits for Densely Connected Architectures Peer-reviewed

    Y. Yuminaka, T. Aoki and T. Higuchi

    Proc. 24th IEEE Int. Symp. Multiple-Valued Logic 207-214 1994/05

  541. Multiwave Computing Circuits Using Integrated Opto-Electronic Devices Peer-reviewed

    T. Aoki, Y. Watanabe, T. Higuchi, S. Kawahito and Y Tadokoro

    IEEE Int. Solid-State Circuits Conf. Digest of Technical Papers 37 134-135 1994/02

  542. Design of Optical Circuits for Multiplex Computing Based on Set-Valued Logic Peer-reviewed

    T. Aoki, S. Maeda and T. Higuchi

    Applied Optics 32 (35) 7170-7183 1993/12

  543. Biocomputing System with No Wiring Peer-reviewed

    T. Aoki and T. Higuchi

    Proc. 1993 Int. Symp. Nonlinear Theory and Its Applications 1 211-216 1993/12

  544. Design of Wave-Parallel Computing Architectures and Its Application to Massively Parallel Image Processing Peer-reviewed

    Y. Yuminaka, T. Aoki and T. Higuchi

    IEICE Trans. Electronics E76-C (7) 1133-1143 1993/07

  545. Design of Frequency-Mode Set-Valued Logic Networks Peer-reviewed

    T. Aoki, Y. Yuminaka and T. Higuchi

    IEE Proc. -G 140 (3) 191-198 1993/06

  546. Design of Set-Valued Logic Networks for Wave-Parallel Computing Peer-reviewed

    Y. Yuminaka, T. Aoki and T. Higuchi

    Proc. 23rd IEEE Int. Symp. Multiple-Valued Logic 277-282 1993/05

  547. Impact of Interconnection-Free Biomolecular Computing Peer-reviewed

    T. Aoki and T. Higuchi

    Poc. 23rd IEEE Int. Symp. Multiple-Valued Logic 271-276 1993/05

  548. Dreams for New-Device-Based Superchips - From Transistors to Enzymes - Peer-reviewed

    T. Aoki

    Proc. 23rd IEEE Int. Symp. Multiple-Valued Logic 140-149 1993/05

  549. Optical Multiplex Computing Based on Set-Valued Logic and Its Application to Parallel Sorting Networks Peer-reviewed

    S. Maeda, T. Aoki and T. Higuchi

    IEICE Trans. Informations and Systems E76-D (5) 605-615 1993/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8532

    More details Close

    A new computer architecture using multiwavelength optoelectronic integrated circuits (OEICs) is proposed to attack the problems caused by interconnection complexity. Multiwavelength-OEIC architectures, where various wavelengths are employed as information carriers, provide the wavelength as an extra dimension of freedom for parallel processing, so that we can perform several independent computations in parallel in a single optical module using the wavelength space. This "multiplex computing" enables us to reduce the wiring area required by a network and improve their complexity. In this paper, we discuss the efficient multiplexing of Batcher's bitonic sorting networks, highly parallel computing architectures that require global interconnections inherently. A systematic multiplexing of interconnection topology is presented using a binary representation of the connectivities of interconnection paths. It is shown that the wiring area can be reduced by a factor of / r^2 using r kinds of wavelength components.

  550. Toward Multiwave Opto-Electronics for 3-D Parallel Computing Peer-reviewed

    S. Maeda, T. Aoki and T. Higuchi

    IEEE Int. Solid-State Circuits Conf. Digest of Technical Papers 132-133,275 1993/02

  551. A Model of Biodevice Networks for Interconnection-Free Computing Peer-reviewed

    T. Aoki and T. Higuchi

    Extended Abstracts of Int. Symp. Bioelectronic and Molecular Electronic Devices 9-10 1992/12

  552. Interconnection-Free Biomolecular Computing Peer-reviewed

    T. Aoki, M. Kameyama and T. Higuchi

    IEEE Computer 25 (11) 41-50 1992/11

  553. Design of Set-Valued Logic Networks Based on a Model of Multiwavelength Optoelectronic Integrated Circuits Peer-reviewed

    AOKI Takafumi, MAEDA Shuichi, HIGUCHI Tatsuo

    The Transactions of the Institute of Electronics,Information and Communication Engineers. J75-D-I (7) 419-430 1992/07

    Publisher:

    ISSN: 0915-1915

  554. Set-Valued Logic Networks Based on Optical Wavelength Multiplexing Peer-reviewed

    S. Maeda, T. Aoki and T. Higuchi

    Proc. 22nd IEEE Int. Symp. Multiple-Valued Logic 282-290 1992/05

  555. Design of an Ultra-Higher-Valued Logic Network Based on Frequency-Mode Set-Valued Logic Peer-reviewed

    AOKI Takafumi, YUMINAKA Yasushi, HIGUCHI Tatsuo

    The Transactions of the Institute of Electronics,Information and Communication Engineers. J75-D-I (4) 210-220 1992/04

    Publisher:

    ISSN: 0915-1915

  556. Design of an ultra-higher-valued biocomputing system based on set logic network Peer-reviewed

    AOKI T.

    The Transactions of the Institute of Electronics,Information and Communication Engineers. J74-D-I (9) 604-612 1991/09

    Publisher:

    ISSN: 0915-1915

  557. Design of a Set Logic Network Based on Frequency Multiplexing and Its Applications to Image Processing Peer-reviewed

    Y. Yuminaka, T. Aoki and T. Higuchi

    Proc. 21st IEEE Int. Symp. Multiple-Valued Logic 8-15 1991/05

  558. Design of Interconnection-Free Biomolecular Computing System Peer-reviewed

    T. Aoki, M. Kameyama and T. Higuchi

    Proc. 21st IEEE Int. Symp. Multiple-Valued Logic 173-180 1991/05

  559. Interconnection-Free Biomolecular Computing System Based on a Set-Theoretic Switching Algebra Peer-reviewed

    T. Aoki, M. Kameyama and T. Higuchi

    Extended Abstracts of Int. Symp. Bioelectronic and Molecular Electronic Devices 69-70 1990/12

  560. Interconnection-Free Set Logic Network Based on a Bio-Device Model Peer-reviewed

    T. Aoki, M. Kameyama and T. Higuchi

    IEE Electronics Letters 26 1015-1016 1990/07

  561. バイオ素子モデルに基づく超多値・高並列論理回路網の構成 Peer-reviewed

    亀山充隆,青木孝文,樋口龍雄

    電子情報通信学会論文誌 J72-D-I (7) 535-544 1989/07

    Publisher: 電子情報通信学会

    ISSN: 0915-1915

  562. Design of a Highly Parallel Set Logic Network Based on a Bio-Device Model Peer-reviewed

    T.Aoki, M.Kameyama and T.Higuchi

    Proc. 19th IEEE Int. Symp. Multiple-Valued Logic 360-367 1989/05

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    ISSN: 2432-6380

  30. 3パスSAR強度画像を用いた地表面の3次元計測と性能評価

    山崎祐輝, 伊藤康一, 青木孝文, 上本純平

    映像情報メディア学会技術報告 46 (26(ME2022 72-82)) 2022

    ISSN: 1342-6893

  31. プライバシ保護のための顔画像の非識別化とその性能評価

    塙剛生, 河合洋弥, 伊藤康一, 青木孝文

    映像情報メディア学会技術報告 46 (26(ME2022 72-82)) 2022

    ISSN: 1342-6893

  32. Face Spoofing Attack Detection Using Vision Transformer and Its Performance Improvement by Patch-wise Data Augmentation

    渡邉浩太, 伊藤康一, 青木孝文

    電子情報通信学会技術研究報告(Web) 122 (197(BioX2022 55-61)) 2022

    ISSN: 2432-6380

  33. Performance Improvement of CNN-Based Fingerprint Recognition Using Multiple Attention Mechanism

    流石凪彩, 伊藤康一, 青木孝文

    電子情報通信学会技術研究報告(Web) 122 (197(BioX2022 55-61)) 2022

    ISSN: 2432-6380

  34. A Study of Region-Based Iris Recognition Using Convolutional Neural Network

    川上庄慶, 河合洋弥, 伊藤康一, 青木孝文, 安村慶子, 藤尾正和, 加賀陽介, 高橋健太

    電子情報通信学会技術研究報告(Web) 122 (197(BioX2022 55-61)) 2022

    ISSN: 2432-6380

  35. 3パスSAR強度画像を用いた地表面の3次元計測に関する検討

    山崎祐輝, 伊藤康一, 青木孝文, 上本純平

    電気関係学会東北支部連合大会講演論文集(CD-ROM) 2022 2022

  36. プライバシ保護のための顔画像の非識別化に関する検討

    塙剛生, 河合洋弥, 伊藤康一, 青木孝文

    電気関係学会東北支部連合大会講演論文集(CD-ROM) 2022 2022

  37. 動物プランクトン画像データベースの構築と機械学習による自動種判別の精度評価

    吉田凌太朗, 大曽根葵, 三浦幹太, 大竹裕里恵, 伊藤康一, 牧野渡, 青木孝文, 占部城太郎

    日本陸水学会大会講演要旨集 86th (CD-ROM) 2022

  38. To develop automatic detection and evaluation of abundance for zooplankton using machine learning: Test for taxonomic detection accuracy using Convolutional Neural Network

    大曽根葵, 吉田凌太朗, 牧野渡, 大竹裕里恵, 伊藤康一, 青木孝文, 占部城太郎

    日本ベントス学会・日本プランクトン学会合同大会講演要旨集 2022 2022

  39. Accuracy Improvement of Ultrasound Probe Pose Estimation by Image Reconstruction Loss

    三浦幹太, 伊藤康一, 青木孝文, 大宮淳

    電子情報通信学会技術研究報告(Web) 122 (264(MICT2022 34-42)) 2022

    ISSN: 2432-6380

  40. 眼底3次元画像からの中心窩検出と緑内障診断支援への応用

    近野翼, 二宮高洋, 三浦幹太, 伊藤康一, 檜森紀子, PARMANAND Sharma, 中澤徹, 青木孝文

    映像情報メディア学会技術報告 46 (26(ME2022 72-82)) 2022

    ISSN: 1342-6893

  41. 眼底3次元画像解析のための画像セグメンテーションに関する検討

    近野翼, 二宮高洋, 三浦幹太, 伊藤康一, 檜森紀子, PARMANAND Sharma, 中澤徹, 青木孝文

    電気関係学会東北支部連合大会講演論文集(CD-ROM) 2022 2022

  42. 歯科診療情報標準化に準拠したタブレット端末用入力システムの開発

    小坂 萌, 鈴木 敏彦, 波田野 悠夏, 青木 孝文

    Forensic Dental Science 13 (1) 27-27 2020/09

    Publisher: 日本法歯科医学会

    ISSN: 1883-437X

  43. 3D-CNNを用いた脳MRI画像からの年齢推定手法とその性能評価—メディア工学 ; サマーセミナー2018 : ひろがるビジョン技術の実利用

    上田 大, 伊藤 康一, 呉 凱, 佐藤 和則, 瀧 靖之, 福田 寛, 青木 孝文

    映像情報メディア学会技術報告 = ITE technical report 42 (27) 27-30 2018/08

    Publisher: 東京 : 映像情報メディア学会

    ISSN: 1342-6893

  44. Performance Evaluation of Age Estimation Methods Using ADNI Database-Comparison of Brain Local Features and CNN-

    伊藤康一, 藤本竜一, WU Kai, 佐藤和則, 瀧靖之, 福田寛, 青木孝文

    電子情報通信学会技術研究報告 117 (518(MI2017 63-106)) 2018

    ISSN: 0913-5685

  45. 3D-CNNを用いた脳MRI画像からの年齢推定手法とその性能評価

    上田大, 伊藤康一, 呉凱, 佐藤和則, 瀧靖之, 福田寛, 青木孝文

    映像情報メディア学会技術報告 42 (27(ME2018 75-98)) 2018

    ISSN: 1342-6893

  46. 3D-CNNを用いた脳MRI画像からの年齢推定手法に関する検討

    上田大, 伊藤康一, 呉凱, 佐藤和則, 瀧靖之, 福田寛, 青木孝文

    電気関係学会東北支部連合大会講演論文集(CD-ROM) 2018 2018

  47. A Study of an Age Estimation Method From Brain MRI Images Using 3D-CNN and Its Application

    上田大, 伊藤康一, WU Kai, 佐藤和則, 瀧靖之, 福田寛, 青木孝文

    電子情報通信学会技術研究報告 118 (286(MI2018 38-58)(Web)) 2018

    ISSN: 0913-5685

  48. A Study of a Liveness Detection Method Using Fully Convolutional Network for Face Recognition Systems

    117 (236) 11-15 2017/10/12

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  49. 顔認証システムのための深層学習を用いた生体検知手法とその性能評価 (メディア工学) -- (サマーセミナー2017 : 世界に羽ばたくビジョン技術)

    岡野 健久, 伊藤 康一, 青木 孝文

    映像情報メディア学会技術報告 = ITE technical report 41 (29) 3-6 2017/09

    Publisher: 映像情報メディア学会

    ISSN: 1342-6893

  50. 超音波プローブ・カメラシステムを用いた3次元復元に関する検討 (メディア工学) -- (サマーセミナー2017 : 世界に羽ばたくビジョン技術)

    淀川 滉也, 伊藤 康一, 青木 孝文, 大宮 淳, 近藤 敏志

    映像情報メディア学会技術報告 = ITE technical report 41 (29) 19-22 2017/09

    Publisher: 映像情報メディア学会

    ISSN: 1342-6893

  51. A Study of Calibration between Ultrasound Probe and Camera for 3D Ultrasound Image Reconstruction

    117 (117) 17-22 2017/07/06

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  52. An Age Estimation Method Using Brain Local Features of Brain MRI Images and Its Performance Evaluation

    117 (47) 67-70 2017/05/25

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  53. Three-dimensional Shape Measurement Using Two Snapshots From a Moving Digital Camera

    71 (3) 371-380 2017/05

    Publisher: 映像情報メディア学会

    ISSN: 1342-6907

  54. アルツハイマー病のための脳局所特徴量を用いたMR画像解析に関する検討

    藤本竜一, 伊藤康一, WU Kai, 佐藤和則, 瀧靖之, 福田寛, 青木孝文

    日本医用画像工学会大会予稿集(CD-ROM) 36th 2017

    ISSN: 0288-450X

  55. 乗算アルゴリズムに対するハードウェアトロイ挿入可能性の評価

    伊東 燦, 上野 嶺, 本間 尚文, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2017 63-63 2017

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2017.0_63  

  56. 数論変換に基づく秘匿計算向け暗号の高効率実装

    遠藤 空, ヴィッレ ウリマウル, 本間 尚文, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2017 86-86 2017

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2017.0_86  

  57. プローブ・カメラシステムを用いた3次元超音波像の再構成に関する検討

    淀川 滉也, 伊藤 康一, 青木 孝文, 大宮 淳, 近藤 敏志

    電気関係学会東北支部連合大会講演論文集 2017 221-221 2017

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2017.0_221  

  58. 顔認証システムのための深層学習を用いた生体検知手法に関する検討

    岡野 健久, 伊藤 康一, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2017 169-169 2017

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2017.0_169  

  59. 脳局所特徴量を用いた年齢推定とその高精度化に関する検討 (メディア工学) -- (サマーセミナー2016 : 世界を視る・世界を創るビジョン技術)

    藤本 竜一, 伊藤 康一, 呉 凱, 佐藤 和則, 瀧 靖之, 福田 寛, 青木 孝文

    映像情報メディア学会技術報告 = ITE technical report 40 (28) 31-34 2016/08

    Publisher: 映像情報メディア学会

    ISSN: 1342-6893

  60. シングルパスSAR強度画像を用いた3次元計測手法とその精度評価 (メディア工学) -- (サマーセミナー2016 : 世界を視る・世界を創るビジョン技術)

    菱沼 将太, 伊藤 康一, 青木 孝文, 上本 純平, 浦塚 清峰

    映像情報メディア学会技術報告 = ITE technical report 40 (28) 41-44 2016/08

    Publisher: 映像情報メディア学会

    ISSN: 1342-6893

  61. A Study of an Efficient Method of Selecting Effective Brain Local Features for Age Estimation

    116 (160) 13-18 2016/07/25

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  62. Evaluation of an OpenCL-Based FPGA Accelerator for Phase-Only Correlation

    116 (53) 103-108 2016/05/19

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  63. A Study of 3D Ultrasound Image Reconstruction Using Ultrasound Probe Localization

    116 (38) 129-134 2016/05/19

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  64. A Study of 3D Reconstruction and Color Reproduction from Multi-Band and Multi-View Images

    29 324-329 2016/05/12

    Publisher: [電子情報通信学会]

  65. A-7-12 A Multiple Fault Injection Attack against Software on Cortex-M0+ Processors and a Countermeasure

    Nashimoto Shoei, Homma Naofumi, Hayashi Yu-ichi, Takahashi Junko, Fuji Hitoshi, Aoki Takafumi

    Proceedings of the IEICE Engineering Sciences Society/NOLTA Society Conference 2016 98-98 2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 2189-700X

  66. 脳局所特徴量を用いた年齢推定手法の高精度化に関する検討

    藤本 竜一, 伊藤 康一, 呉 凱, 佐藤 和則, 瀧 靖之, 福田 寛, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2016 200-200 2016

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2016.0_200  

  67. シングルパスSAR強度画像を用いた3次元計測手法に関する検討

    菱沼 将太, 伊藤 康一, 青木 孝文, 上本 純平, 浦塚 清峰

    電気関係学会東北支部連合大会講演論文集 2016 201-201 2016

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2016.0_201  

  68. OpenCL-Based Design of an FPGA Accelerator for Phase-Only Correlation

    28 377-382 2015/08/03

    Publisher: [電子情報通信学会]

  69. 多視点マルチバンド画像を用いた高精度3次元復元手法とその評価 (メディア工学) -- (サマーセミナー2015 : 実用分野を切り拓き、価値を生み出すビジョン技術)

    伊藤 秀哉, 伊藤 康一, 青木 孝文, 土田 勝

    映像情報メディア学会技術報告 = ITE technical report 39 (30) 29-32 2015/08

    Publisher: 一般社団法人映像情報メディア学会

    ISSN: 1342-6893

    More details Close

    本稿では,複数視点から撮影されたマルチバンド画像を用いて物体の3次元形状を復元する手法を提案する.提案手法では,位相限定相関法を用いた多視点画像からの3次元復元手法と,マルチバンド画像を用いた高精度画像対応付け手法とを組み合わせることで,高精度に3次元点群を復元する.実験を通して,従来手法よりも高精度に3次元復元が可能であることを示す.

  70. 多視点ステレオのためのPatchMatch Stereoの拡張と性能評価 (メディア工学) -- (サマーセミナー2015 : 実用分野を切り拓き、価値を生み出すビジョン技術)

    平舘 睦基, 伊藤 康一, 青木 孝文, 渡邉 隆史, 運天 弘樹

    映像情報メディア学会技術報告 = ITE technical report 39 (30) 65-68 2015/08

    Publisher: 一般社団法人映像情報メディア学会

    ISSN: 1342-6893

    More details Close

    PatchMatch Stereoは,2眼ステレオ画像から視差マップを生成する手法である.多視点3次元復元への応用も行われているが,2眼ステレオを基本とするため,多視点画像の特徴を十分に利用できていない.本稿では,多視点画像の特徴を活かしたPatchMatch Stereoの拡張を行う.性能評価実験を通し,提案手法が多視点画像からのデプスマップ生成に有効であることを示す.

  71. Hardware Security for Mobile Devices in Public Spaces (情報通信システムセキュリティ)

    林 優一, 本間 尚文, 青木 孝文

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 115 (81) 69-74 2015/06/11

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  72. Hardware Security for Mobile Devices in Public Spaces (インターネットアーキテクチャ)

    林 優一, 本間 尚文, 青木 孝文

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 115 (80) 69-74 2015/06/11

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  73. Techniques for Human Identification Used in the Great East Japan Earthquake : How were victims identified? What are future research challenges?

    AOKI Takafumi, ITO Koichi

    Technical Committee on Biometrics 114 (520) 47-52 2015/03/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

    More details Close

    This paper presents basic methods of victim identification applied in the Great East Japan Earthquake and Tsunami on March 11, 2011. It was proved in this Earthquake/Tsunami disaster that dental identification is very effective compared with other biometric identification methods such as fingerprint/palmprint identification and DNA-based identification. Our group designed and implemented a workflow of large-scale dental identification in cooperation with Miyagi Prefectural Police and Miyagi Dental Association. This paper also discusses the potential of image-based forensic human identification techniques using medical image data such as radiographs, CTs and other modalities.

  74. 脳MRI画像の局所特徴量に基づく年齢推定手法と縦断データベースを用いた性能評価

    近藤, 千裕, 伊藤, 康一, 呉, 凱, 佐藤, 和則, 瀧, 靖之, 福田, 寛, 青木, 孝文

    第77回全国大会講演論文集 2015 (1) 359-360 2015/03/17

    More details Close

    大規模な脳 MRI 画像データベースを用いた統計解析を通して,加齢に伴って脳組織が萎縮することが知られている.この結果を利用することで,正常加齢に伴う脳の形態変化から年齢を推定することができる.推定された年齢と実年齢を比較することで,脳疾患の早期発見や診断支援を行うことが可能となる.そこで,本稿では,解剖学的意味を持つ 90 領域に分割した脳組織の体積を特徴量として脳 MRI 画像から年齢を推定する手法を提案する.脳形態に個人差があるため,正確に実年齢を推定することが難しい.これに対して,本稿では,縦断データを用いた年齢推定実験を通して,実際の撮像間隔と推定された撮像間隔を比較することで,提案手法の有効性を示す.

  75. How were victims identified in the Great East Japan Earthquake?

    IPSJ SIG Notes. CVIM 2015 (3) 1-2 2015/02/27

    Publisher: Information Processing Society of Japan (IPSJ)

    ISSN: 0919-6072

  76. A Multiple-fault Injection Attack Against Cryptographic Software on Cortex-M0 Processor

    IPSJ SIG Notes 2015 (15) 1-8 2015/02/26

    Publisher: Information Processing Society of Japan (IPSJ)

    More details Close

    This paper presents a multiple-fault injection attack against the cryptographic software running on Cortex-M0 processor core. Multiple-fault injection attacks have been a problem on software running on embedded microcontroller equipped with countermeasures based on recalculation. The attacks can circumvent the countermeasure through an adaptive fault injection even when cryptographic program is unknown to the attackers. However, the possibility of the attack described above is unknown on the microcontrollers which have instructions with different execution cycles because the attackers cannot identify the execution timing of branch instruction. This paper shows a scanning method against the cryptographic software, which can be applied to the microcontroller described above. Validity of proposed attack is demonstrated through the experiment using AES program running on the Cortex-M0 core, which have been widely used for cryptographic modules.

  77. 脳MRI画像の局所特徴量に基づく年齢推定手法と縦断データベースを用いた性能評価

    近藤千裕, 伊藤康一, WU Kai, 佐藤和則, 瀧靖之, 福田寛, 青木孝文

    情報処理学会全国大会講演論文集 77th (2) 2015

  78. Performance Evaluation of an Age Estimation Method Using Longitudinal Brain MRI Database

    近藤千裕, 伊藤康一, WU Kai, 佐藤和則, 瀧靖之, 福田寛, 青木孝文

    電子情報通信学会技術研究報告 114 (482(MI2014 53-118)) 2015

    ISSN: 0913-5685

  79. An Age Estimation Method Using Local Features of Brain MRI Images and Its Performance Evaluation Using the ADNI Database

    近藤千裕, 伊藤康一, WU Kai, 佐藤和則, 瀧靖之, 福田寛, 青木孝文

    電子情報通信学会技術研究報告 115 (139(MI2015 32-47)) 2015

    ISSN: 0913-5685

  80. A Study of an Analysis of Structural Brain Network of the ADNI Database

    近藤千裕, 伊藤康一, WU Kai, 佐藤和則, 瀧靖之, 福田寛, 青木孝文

    電子情報通信学会技術研究報告 115 (301(MI2015 57-72)) 2015

    ISSN: 0913-5685

  81. 暗号LSIへの実装攻撃に対する反応型対策の高精度化に関する検討

    石幡 大輔, 本間 尚文, 林 優一, 三浦 典之, 藤本 大介, 永田 真, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2015 129-129 2015

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2015.0_129  

  82. 多視点マルチバンド画像からの3次元復元手法に関する検討

    伊藤 秀哉, 伊藤 康一, 青木 孝文, 土田 勝

    電気関係学会東北支部連合大会講演論文集 2015 110-110 2015

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2015.0_110  

  83. ストリーム暗号ソフトウェアに対する能動的物理攻撃の評価

    河井 航, 本間 尚文, 福島 和英, 清本 晋作, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2015 89-89 2015

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2015.0_89  

  84. An Age Estimation Method Using Local Features of Brain MRI Images and Its Evaluation

    KONDO Chihiro, ITO Koichi, WU Kai, SATO Kazunori, TAKI Yasuyuki, FUKUDA Hiroshi, AOKl Takafumi

    IEICE technical report. 114 (311) 11-16 2014/11/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    It is well known that brain tissues have age-related morphological changes through a set of statistical analysis using large-scale brain MRI image databases. This fact allows us to estimate the age of a subject from brain MRI images by evaluating brain morphological changes with healthy aging. This paper proposes an age estimation method using local features extracted from T1-weighted MRI images. The brain local features are defined by volumes of brain tissues separated into 90 local regions denned by the Automated Anatomical Labeling atlas. We evaluate performance of the proposed method using 1,146 T1-weighted MRI images from the Aoba Brain Imaging Project and the Tsurugaya Project. We also analyze effectiveness of each local region for age estimation and discuss its medical implication.

  85. Effect of Precisely Timed Intentional Electromagnetic Interference on Internal Operation in Cryptographic Device

    KOBAYASHI Mizuki, HAYASHI Yu-ichi, HOMMA Naofumi, MIZUKI Takaaki, AOKI Takafumi, SONE Hideaki

    114 (268) 11-15 2014/10/23

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a new intentional electromagnetic interference (IEMI) fault-injection method that can inject transient faults timely at a distance from cryptographic operations. Such IEMI fault injection could pose severe threats to many cryptographic devices assumed that attackers cannot access them directly since it can be used for performing fault analysis. The proposed IEMI fault-injection method injects a block (i.e., period) of continuous sinusoidal waves via cables attached to cryptographic devices instead of immediate electromagnetic pulse used in the conventional methods. The injected EM waves have a temporary impact in the cryptographic module, but not in other components on the device. Another important feature of the proposed method is to employ EM information leaked from the cryptographic operations for the trigger signal of the fault injection. In this paper, we demonstrate that the proposed method can inject faults timely into the final round of an AES hardware through an experiment.

  86. A Study on Palmprint Extraction Method for Contactless Palmprint Recognition

    SATO Takuto, AOYAMA Shoichiro, SAKAI Shuji, YUSA Shusaku, ITO Koichi, AOKI Takafumi

    Technical Committee on Biometrics 114 (251) 37-41 2014/10/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Palmprint region extraction is one of the most important procedures for palmprint recognition, since the accuracy of palmprint region has a significant impact on recognition performance. Especially, in a contactless recognition system, a palmprint region has to be extracted from a palm image with taking into consideration a variety of hand pose. Most of conventional methods of palmprint region extraction assume that all the fingers are spread and a palm faces to a camera. This assumption forces users to locate his/her hand with limited pose and position, resulting in impairing the flexibility of the contactless palmprint recognition system. Addressing the above problem, this paper proposes a novel palmprint region extraction method robust against hand pose. Through a set of experiments using our database which contains palm images with different hand pose, we demonstrate effectiveness of the proposed method.

  87. A Study of a Score Calculation Method Using Correspondence of Feature Points for Biometric Authentication

    ITO Koichi, AOYAMA Shoichiro, AOKI Takafumi

    Technical Committee on Biometrics 114 (251) 43-48 2014/10/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In the field of computer vision, a lot of feature-based correspondence matching methods have been proposed. These methods are also effective for biometric recognition. In general, in the case of feature-based matching methods, the matching score is defined as a ratio between the number of feature points and corresponding points. These methods are also used to correct image deformation by fitting an image transformation model to images according to the correspondence between images. Then, the matching score is calculated from the corrected images so as to take into consideration image deformation. On the other hand, this paper proposes a score calculation method which directly calculates a matching score from the correspondence obtained by the feature-based matching method. The proposed method does not need any deformation model defined for each biometric trait to handle image deformation. The combination of the matching scores calculated by the proposed method and the conventional method improves the performance of biometric recognition algorithms, since these scores play a complementary role in decision. Through a set of experiments using a palmprint image database, we demonstrate that the proposed method exhibits efficient performance for biometric recognition.

  88. Implementation and Evaluation of KCipher-2 Software for Smart Cards

    2014 (2) 64-71 2014/10/15

  89. 脳局所特徴量に基づく年齢推定手法と脳MRI画像データベースを用いた性能評価 (メディア工学 サマーセミナー2014 : 未来を拓くビジョン技術)

    近藤 千裕, 伊藤 康一, 呉 凱, 佐藤 和則, 瀧 靖之, 福田 寛, 青木 孝文

    映像情報メディア学会技術報告 = ITE technical report 38 (32) 15-18 2014/08

    Publisher: 一般社団法人映像情報メディア学会

    ISSN: 1342-6893

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    正常加齢に伴う脳の形態的変化を利用することで,脳MRI画像から年齢を推定することができる.従来手法では,推定に用いる特徴量が多かったり,評価に用いられているデータが数百程度しかなかったりといった問題がある.これに対して,本稿では,解剖学的意味を持つ90領域に分割した脳組織の体積を特徴量として脳年齢を推定する手法を提案する.また,大規模データベースを用いて提案手法の有効性を実証する.

  90. ドアレバーのための指関節紋認証システムの高性能化 (メディア工学 サマーセミナー2014 : 未来を拓くビジョン技術)

    草薙 大地, 青山 章一郎, 伊藤 康一, 青木 孝文

    映像情報メディア学会技術報告 = ITE technical report 38 (32) 5-8 2014/08

    Publisher: 一般社団法人映像情報メディア学会

    ISSN: 1342-6893

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    指の第二関節の外側のパターンである指関節紋は,手を握った状態でも認証可能である.この特徴を活かし,ドアレバーのための個人認証システムに指関節紋が応用されている.このシステムでは,1枚の静止画像を用いて,人差指,中指,薬指,小指の指関節紋を照合するが,安定して関心領域(Region Of Interest: ROI)を抽出することが難しい.そこで,本稿では,動画像を用いた指関節紋認証システムを提案する.動画像を用いることで安定したROI抽出を可能とする.また,提案システムのROI抽出性能と認証性能を評価し,提案システムの有効性を示す.

  91. SAR強度画像間の対応付けに基づく地表面の3次元計測手法の検討 (メディア工学 サマーセミナー2014 : 未来を拓くビジョン技術)

    丸木 大樹, 酒井 修二, 伊藤 康一, 青木 孝文, 上本 純平, 浦塚 清峰

    映像情報メディア学会技術報告 = ITE technical report 38 (32) 43-46 2014/08

    Publisher: 一般社団法人映像情報メディア学会

    ISSN: 1342-6893

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    本稿では,SARの投影モデルを新たに定義し,航路が異なる2枚のSAR強度画像から地表面の3次元計測を行う手法を提案する.提案手法は,バンドル調整をSAR画像に適用することで,地上基準点を用いずに計測精度を向上させることが可能である.精度評価実験により,従来手法と比べ,提案手法が制限の少ない条件下で,高精度な3次元計測が可能であることを示す.

  92. Feasibility of Fault-injected Timing Identification for Actual Cryptographic Devices Using Side-channel Information

    NAKAMURA Ko, HAYASHI Yu-ichi, MIZUKI Takaaki, HOMMA Naofumi, AOKI Takafumi, SONE Hideaki

    IEICE technical report. Electromagnetic compatibility 114 (129) 37-42 2014/07/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    The intentional electromagnetic interference (IEMI) fault-injection method using continuous sine waves causes random-bytes faults in the cryptographic devices. Therefore, it was difficult to obtain faulty ciphertext available for conventional analysis methods which assumes the specific byte errors in ciphertext. In this paper, in order to identify the number of fault-injected bytes, we describe an identification technique using side-channel information. The feasibility of the proposal method is verified by observation of voltage waveforms between a power line and ground plane of cryptographic module in time domain with time resolution by 1 ns. In our experiment, we employ a real cryptographic device with Advanced Encryption Standard (AES) implemented and a clock glitch generator which can be adjusted by 0.17 ns steps. Through this experiment, we identified that the change of side-channel waveforms correspond to the number of faulty bytes. Moreover, on the basis of this result, we showed that it is possible to extract available faulty ciphertext for the conventional analysis methods.

  93. Identification Method of Fault-injected Timing on Cryptographic Devices Using Side-channel Information

    NAKAMURA Ko, HAYASHI Yu-ichi, MIZUKI Takaaki, HOMMA Naofumi, AOKI Takafumi, SONE Hideaki

    IEICE technical report. Electromagnetic compatibility 114 (93) 7-12 2014/06/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper describes a new technique to choose faulty ciphertexts available for Differential Fault Analysis (DFA) from those obtained by randomly executing the intentional electromagnetic interference (IEMI) fault-injection method. This technique employs side-channel information as an identifier in order to choose faulty ciphertexts to be suitable for DFA. For a fundamental study, we monitor transient voltage as side-channel information on a cryptographic device in our experiment. As a result, the amplitude of the waveform increased at the timing of fault-injection. This implies that we can choose suitable faulty ciphertexts using such a change of side-channel information in time domain.

  94. 3D 基線長変化にロバストな高精度ステレオ画像間対応付け手法

    酒井 修二, 伊藤 康一, 青木 孝文

    画像ラボ 25 (6) 47-53 2014/06

    Publisher: 日本工業出版

    ISSN: 0915-6755

  95. A Study of an Ultrasound Contrast Agent Detection Method with Motion Estimation

    NORO Kazumasa, ITO Koichi, YAMAGISAWA Yukari, SAKAMOTO Maya, MORI Shiro, SHIGA Kiyoto, KODAMA Tetsuya, AOKI Takafumi

    IEICE technical report. Signal processing 114 (39) 15-20 2014/05/22

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a high-accuracy microbubble detection method for diagnostic ultrasound imaging systems. The proposed method detects ultrasound contrast agents using spatio-temporal analysis of the pixel intensity variation over several frames, where we take into account the motion of the target issue. Through a set of experiments using mice and clinical data, we demonstrate that the proposed method exhibits efficient performance compared with conventional methods.

  96. ステレオビジョンに基づくSAR強度画像からの3次元計測

    丸木大樹, 酒井修二, 伊藤康一, 青木孝文, 上本純平, 浦塚清峰

    研究報告コンピュータビジョンとイメージメディア(CVIM) 2014 (6) 1-8 2014/05/08

    Publisher: 一般社団法人情報処理学会

    ISSN: 0919-6072

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    本稿では,2 枚の合成開口レーダ (Synthetic Aperture Radar: SAR) 強度画像から地表面の 3 次元計測を行う手法を提案する.SAR の性質を利用して SAR 画像から 3 次元計測を行う手法がリモートセンシングの分野で提案されているが,航路が限定されたり,高精度化のために地上基準点を必要としたりする.一方で,コンピュータビジョンの分野では,複数枚のカメラ画像を用いて 3 次元復元を行う手法が数多く提案されている.SAR 画像をカメラ画像と同等に扱うことができれば,コンピュータビジョンの原理に基づいて複数の航路で取得された SAR 画像から 3 次元計測を行うことができる.具体的には,SAR の計測モデルから導出されるレーダ画像投影モデルを用いることで,SAR 画像間のステレオマッチング,三角測量に基づく 3 次元計測,そして,バンドル調整による最適化を行う.また,提案手法により求めた 3 次元点と航空レーザ測量により取得した数値標高モデル (Digital Elevation Model: DEM) との比較を行い,提案手法の精度を評価する.

  97. カメラの移動撮影に基づく簡便なオンライン3次元計測システムの検討

    山尾創輔, 三浦衛, 酒井修二, 伊藤康一, 青木孝文

    研究報告コンピュータビジョンとイメージメディア(CVIM) 2014 (2) 1-8 2014/05/08

    Publisher: 一般社団法人情報処理学会

    ISSN: 0919-6072

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    本稿では,カメラで静止画像を撮影しながら,高精度かつ密な 3 次元点群を逐次的に計測する簡便なオンライン 3 次元計測システムを提案する.これまでに提案されている密な 3 次元計測手法は,一般的に入力画像が全て揃ってから計測処理を行う.これらの手法は,画像が追加されるたびに最初から処理をやり直す必要があるため,撮影しながら 3 次元形状を計測することができない.一方で,提案システムは,撮影のたびに,(i)Structure from Motion によるカメラパラメータ推定と,(ii) 位相限定相関法に基づく密な対応付けを実行する.これらの処理は数秒しかかからないので,非同期かつ並列に処理を実行することで,撮影するたびに物体の 3 次元形状を逐次的に計測することが可能となる.性能評価実験を通して,従来手法に匹敵する精度でオンライン 3 次元計測が可能であることを示す.

  98. 認識・検出 携帯電話向け非接触掌紋認証 : アルゴリズムの提案からAndroid端末向けアプリの開発まで

    青山 章一郎, 伊藤 康一, 青木 孝文

    画像ラボ 25 (5) 16-22 2014/05

    Publisher: 日本工業出版

    ISSN: 0915-6755

  99. 位相限定相関法に基づく動画像からの高精度 3 次元復元とその性能評価

    山尾創輔, 酒井修二, 伊藤康一, 青木孝文

    第76回全国大会講演論文集 2014 (1) 213-214 2014/03/11

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    本稿では,位相限定相関法に基づく動画像からの3次元復元手法を提案する.対象物体を撮影した動画像を用いることで,オクルージョンの発生を抑えるとともに,3次元復元に用いる画像の選択肢が多くなるという利点がある.一方で,3次元復元に用いるフレームを適切に選択しないと,ステレオマッチングや3次元復元の精度が低下してしまう.これに対して,提案手法は,カメラの運動推定の際に生成される粗な物体形状とカメラ位置から,局所領域ごとに,3次元復元に適切なフレームを選択する.そして,画像間の変形を正規化し,位相限定相関法を用いて高精度かつ密な3次元点群を復元する.手持ちのカメラで撮影した動画像を用いた実験を通して,従来手法との比較を行う.

  100. A Study on Correlation Electromagnetic Analysis against KCipher-2 Implemented on a Microcontroller for ZigBee Device

    UNO Hajime, ENDO Sho, HOMMA Naofumi, AOKI Takafumi, NAKANO Yuto, KIYOMOTO Shinsaku, MIYAKE Yutaka

    IEICE technical report. WBS, Wideband System 113 (485) 35-40 2014/03/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a correlation electromagnetic analysis against the stream cipher KCipher-2 software. Side-channel attacks are often applied to stream ciphers, if attacker can observe or choose initial vectors. There is a report that we can reveal a part of secret keys in the initialization process of KCipher-2 by a chosen-vector attack. In this paper, we discuss the potential of the correlation electromagnetic analysis against a KCipher-2 software implemented on a microcontroller for ZigBee device.

  101. 脳MRI画像の局所特徴量に基づく年齢推定手法の検討

    近藤千裕, 伊藤康一, 呉凱, 佐藤和則, 瀧靖之, 福田寛, 青木孝文

    電気関係学会東北支部連合大会講演論文集(CD-ROM) 2014 2014

  102. 暗号モジュールから漏洩する情報を利用するサイドチャネル攻撃

    本間尚文, 青木孝文

    システム制御情報学会誌 57 (12) 504-509 2013/12

    DOI: 10.11509/isciesci.57.12_505  

  103. Fundamental Study on a Mechanism of Non-invasive Fault-injection at Arbitrary Timing of Cryptographic Processing

    Kobayashi Mizuki, Hayashi Yu-ichi, Homma Naofumi, Mizuki Takaaki, Aoki Takafumi, Sone Hideaki

    IEICE technical report. Microwaves 113 (260) 175-179 2013/10/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In this paper, we introduce a new type of intentional electromagnetic interference (IEMI) fault-injection method with timing control based on leaked information. We demonstrate the fault injection attack based on the above IEMI through experiments using an Advanced Encryption Standard (AES) module implemented on a standard evaluation board (SASEBO). The experimental results indicate that generating effective faults is feasible. This paper also investigates a mechanism of faulty outputs from cryptographic modules due to the proposal method. We show the mechanism of fault occurrence through experiments using faulty ciphertexts and a sinusoidal wave injection to the specific round. The experimental results indicate that faulty outputs from cryptographic modules are caused by the overclocking to the cryptographic module.

  104. Image Processing Technology and Open Innovation

    AOKI Takafumi, ITO Koichi

    The Journal of the Institute of Electronics, Information, and Communication Engineers 96 (10) 776-779 2013/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5693

  105. Non-invasive fault-injection at arbitrary timing of cryptographic processing using leaked EM information

    Kobayashi Mizuki, Hayashi Yu-ichi, Homma Naofumi, Mizuki Takaaki, Aoki Takafumi, Sone Hideaki

    Proceedings of the Society Conference of IEICE 2013 101-101 2013/09/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  106. A Study on User Interfaces of Touchless Palmprint Recognition Application

    Ota Haruki, Aoyama Shoichiro, Watanabe Ryu, Ito Koichi, Miyake Yutaka, Aoki Takafumi

    Proceedings of the Society Conference of IEICE 2013 "S-48"-"S-49" 2013/09/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  107. Implementation of a 3D auditory display with stereo-vision head tracking

    ITO Atsuro, SUZUKI Yoiti, SAKAI Shuji, ITO Koichi, OHUCHI Makoto, SAKAMOTO Shuichi, AOKI Takafumi, IWAYA Yukio

    Technical report of IEICE. EA 113 (177) 35-38 2013/08/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Virtual 3D Auditory Displays (VADs), systems capable of presenting rich 3D auditory space information, have received signifcant attention. Our interest focuses on VADs that re-create the sound pressures at the listener's ears using head-related transfer functions (HRTFs). Here, HRTFs should match the listener's head movement for a natural listening experience, requiring head tracking. Available solutions, however, call for sensors attached to the listener; a requirement we seek to overcome. We developed a new head tracking system based on stereo cameras using phase-only correlation and particle filtering. The proposed head tracking system was coupled with a VAD middleware called SiFASo.

  108. ステレオマッチングに最適な動画像のフレーム選択に基づく3次元復元手法の検討 (メディア工学 サマーセミナー2013 : 画像処理の理論と実際)

    山尾 創輔, 酒井 修二, 伊藤 康一, 青木 孝文

    映像情報メディア学会技術報告 = ITE technical report 37 (36) 19-22 2013/08

    Publisher: 一般社団法人映像情報メディア学会

    ISSN: 1342-6893

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    本稿では,動画像から物体の3次元形状を復元する手法を提案する.提案手法は,Structure from Motionを用いて推定した粗な物体形状とカメラ位置から,ステレオマッチングに適したフレームを選択する.そして,画像間の変形を正規化し,位相限定相関法を用いて高精度かつ密な3次元点群を復元する.実験により,従来手法よりも高精度に3次元復元が可能であることを示す.

  109. レーザ回折光に基づく簡便な3次元計測システムとその応用に関する検討 (メディア工学 サマーセミナー2013 : 画像処理の理論と実際)

    佐藤 拓杜, 酒井 修二, 青山 章一郎, 遊佐 秀作, 伊藤 康一, 青木 孝文

    映像情報メディア学会技術報告 = ITE technical report 37 (36) 31-34 2013/08

    Publisher: 一般社団法人映像情報メディア学会

    ISSN: 1342-6893

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    本稿では,レーザ回折光に基づく能動型3次元計測システムを提案するとともに,非接触掌紋認証へ応用する.提案システムは,回折格子を通してレーザ光を対象に照射し,カメラでパターンを観測することで対象の3次元計測を行う.提案システムを用いることで,非接触掌紋認証で必須となる手のひらの幾何補正を簡便かつ高精度に行うことができる.性能評価実験を通して,手のひらの傾きにロバストな認証が可能であることを実証する.

  110. Face Recognition Frameworks Using Occluded-Region Detection and its Performance Evaluation

    26 530-535 2013/07/29

    Publisher: [電子情報通信学会]

  111. プロジェクタ・カメラシステムを用いた環境適応型ディスプレイ (特集 光技術と画像処理技術の融合 : なにができるのか)

    伊藤 康一, 青木 孝文

    光アライアンス 24 (7) 21-25 2013/07

    Publisher: 日本工業出版

    ISSN: 0917-026X

  112. 動画像からの高精度・高密度な3次元点群の復元に関する検討

    山尾創輔, 酒井修二, 伊藤康一, 青木孝文

    研究報告コンピュータビジョンとイメージメディア(CVIM) 2013 (17) 1-8 2013/05/23

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    本稿では,動画像から高精度・高密度な 3 次元点群を復元する手法を提案する.動画像を用いることで,限られた枚数の多視点画像ではオクルージョンとなる領域を復元することが可能である.一方で,動画像のすべてのフレームでマッチングをすると膨大な計算時間がかかるため,3 次元復元に適したフレームを選択する必要がある.提案手法は,まず,Structure from Motion を用いて対象の粗い 3 次元メッシュを求める.次に,メッシュとカメラの幾何関係からステレオマッチングに適したフレームを選択する.そして,選択されたフレームから対応する局所領域を抽出し,位相限定相関法を用いて高精度かつ密な 3 次元点群を得る.提案手法を用いることで,計算量を抑えつつ,高精度・高密度な 3 次元復元が可能である.実験により,復元誤差 1mm 以下の精度で密な 3 次元点群を復元できることを示す.

  113. 多視点ステレオのための位相限定相関法に基づく画像マッチングの高精度化

    酒井修二, 伊藤康一, 青木孝文, 増田智仁, 運天弘樹

    研究報告コンピュータビジョンとイメージメディア(CVIM) 2013 (22) 1-8 2013/03/07

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    多視点ステレオアルゴリズムにおいて,3次元点を推定するための画像マッチング手法は,アルゴリズムの精度,ロバスト性,計算コストに大きく影響する重要な要素である.これまでに,筆者らは,位相限定相関法(Phase-Only Correlation: POC)を多視点画像間のマッチングに用いることで,従来の正規化相互相関(Normalized Cross-Correlation: NCC)と比べて,少ない計算コストで高精度な3次元復元が実現できることを示した.本稿では,POCに基づく画像マッチング手法を高精度化するために,対象物体の形状を考慮したマッチングを適用し,ステレオ画像間の変形を軽減する手法を提案する.実験を通して,基線長が長い場合などのようにステレオ画像間の変形が大きい場合に3次元復元精度が向上することを示す.

  114. ガロア体上の乗算器モジュールジェネレータの構築

    岡本広太郎, 本間尚文, 青木孝文

    第75回全国大会講演論文集 2013 (1) 135-136 2013/03/06

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    本稿では,ガロア体上の算術演算回路を自動生成可能なシステムを提案する.提案するシステムは,任意の既約多項式(次数2~256)を入力すると,ガロア体上の乗算器の最適な構成の1つであるMastrovito乗算器のHDL記述を生成する.同システムは,その内部にガロア体算術演算回路グラフ(Galois-Field Arithmetic Circuit Graph: GF-ACG)と呼ばれるグラフ表現に基づく設計手法を用いることで,生成する乗算器の機能を形式的に検証することができる.本稿では,まず,GF-ACGによるMastrovito乗算器の記述について述べ,構築したシステムの構成を概説する.その上で,代表的な次数の既約多項式を用いた生成実験を通して,機能が完全に検証された乗算器が短時間で生成されることを示す.

  115. 災害時の情報収集のための単眼カメラを用いた入力システムの検討

    三浦衛, 本間尚文, 畑雅之, 片桐寛, 青木孝文

    第75回全国大会講演論文集 2013 (1) 531-532 2013/03/06

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    本稿では,災害時の情報収集に適した入力システムを提案する.提案するシステムは,単眼カメラと透明なパネルを組み合わせた簡便な構成で実現可能であり,災害時にも動作するネットワークノードなどに搭載することを想定する.また,カメラを用いた画像の取得だけでなく,パネルを指でなぞることでタッチパネルのようなポインティングデバイスとしても機能する.本稿では,同機能の実現に向けて,パネル越しに人物の手を撮影した画像から指先の領域を検出するアルゴリズム,および指先とパネルとの接触を判定するアルゴリズムについて検討する.

  116. ステレオ動画像のための画像対応付けに基づく高精度な視差マップ生成手法の検討

    佐々木満春, 伊藤康一, 青木孝文, 石上智英, 西村明夫

    第75回全国大会講演論文集 2013 (1) 553-554 2013/03/06

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    裸眼式3次元ディスプレイでステレオ動画像を立体視するためには,高精度な視差マップに基づいて擬似的な多視点動画像を生成する必要がある.1フレームのステレオ動画像から正確な視差マップを生成する手法としてGraph Cutを用いた手法が知られているが,処理時間と処理結果の安定性に問題がある.これに対して,本稿では,画像対応付けに基づく高精度な視差マップ生成手法の提案をする.提案手法では,位相限定相関法を用いてフレーム間の動きを求め,画像対応付けと画像セグメンテーションとを組み合わせることで,小領域ごとの視差を推定する.そして,信頼性の高い視差のみを用いた最適化により視差マップを生成する.ステレオ動画像を用いた性能評価実験により,提案手法の有用性を示す.

  117. 位相限定相関法に基づくステレオビジョンによる高精度頭部運動追従法

    伊藤敦郎, 酒井修二, 伊藤康一, 青木孝文, 鈴木陽一, 坂本修一

    第75回全国大会講演論文集 2013 (1) 549-550 2013/03/06

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    近年,聴取者の頭部運動に合わせて適切な伝達関数を音源信号に畳み込むことで聴取者に3次元音空間情報を提示する伝達関数合成型の3次元聴覚ディスプレイが注目されている.より自然な聴取を行うためには,頭部に位置センサを装着せず,ワイヤレスで頭部運動をセンシングする必要がある.本稿では,位相限定相関法とパーティクルフィルタを用いて,動画像から高精度に聴取者の頭部運動を追従するシステムを提案する.パーティクルフィルタにおける運動モデルを位相限定相関法を用いて前後フレームの対応関係から定義し,時間軸方向の局所的なモデルを生成することで,聴取者の突発的な頭部運動に対しても高精度な追従を可能としている.

  118. 局所位相特徴に基づく顔認証アルゴリズムの検討

    青山章一郎, 伊藤康一, 青木孝文

    第75回全国大会講演論文集 2013 (1) 51-52 2013/03/06

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    バイオメトリクスの分野において,汎用的な局所特徴である Local Binary Patterns (LBP) を基本とした照合手法が数多く提案されている.しかし,これらの手法は,生体特徴ごとに最適化が必要であるため汎用性が低いこと,画像間のひずみに対応していないため生体特徴に特化した手法と比べて性能が低いことが問題である.これに対して,局所位相特徴に基づく手法は,画像間の変形に対してロバストな照合が可能である.本稿では,バイオメトリクス認証への適用例として,局所位相特徴を用いた顔認証アルゴリズムを提案する.一般に公開されている顔画像データベース用いた性能評価実験を通して,提案手法が高い認証性能を有することを実証する.

  119. 多視点ステレオのための位相限定相関法に基づく画像マッチング手法とその性能評価

    酒井修二, 伊藤康一, 青木孝文, 増田智仁, 運天弘樹

    第75回全国大会講演論文集 2013 (1) 23-24 2013/03/06

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    多視点ステレオは,異なる視点から撮影された複数枚の画像から物体の3次元形状を復元する技術である.従来の多視点ステレオでは,3次元点の座標を離散的に変化させながら繰り返し画像マッチングを行い,最もマッチングスコアの高くなる3次元座標を復元点とする.高精度な3次元復元のためには,非常に細かい刻み幅で座標を変化させる必要があり,計算コストが膨大になるという問題がある.これに対して,本稿では,多視点ステレオのための位相限定相関法に基づく画像マッチング手法を提案する.提案手法では,1回の画像マッチングにより得られる相関関数から直接3次元座標を推定するため,少ない計算コストで高精度な3次元復元が可能である.また,公開データセットを用いた実験により,提案手法の性能評価を行う.

  120. 基線長の短い車載ステレオカメラを用いた障害物検出手法の検討

    和泉圭祐, 三浦衛, 伊藤康一, 青木孝文

    全国大会講演論文集 2013 (1) 175-177 2013/03/06

    Publisher: 一般社団法人情報処理学会

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    基線長の短いステレオカメラは,基線長の長いステレオカメラと比較して,距離計測の精度が低いが,小型のユニットで実現できるため利便性が高い.また,これまでに提案されている車載ステレオカメラを用いた障害物検出手法は,基線長の長いステレオカメラを基本としているため,基線長の短いステレオカメラを用いると十分な性能が出ない場合が多い.そこで,本稿では,精度と利便性の高い障害物検出を実現するために,基線長の短いステレオカメラで撮影した画像から位相限定相関法を用いて高精度に視差画像を生成し,等視差領域のクラスタリングを用いて高精度に障害物を検出する手法を提案する.

  121. LED暗号ハードウェアに対する相関電力解析とその対策

    ヴィッレウリマウル, 遠藤翔, 本間尚文, 青木孝文

    全国大会講演論文集 2013 (1) 533-535 2013/03/06

    Publisher: 一般社団法人情報処理学会

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    近年,従来のブロック暗号アルゴリズムより小さな面積で実装可能な軽量暗号アルゴリズムとしてLED暗号が提案されており,RFIDやセンサーネットワークなどへの応用が期待されている.一方,暗号ハードウェアの消費電力,電磁波,演算時間などを解析し秘密情報を抽出するサイドチャネル攻撃が問題となっており,従来のブロック暗号ハードウェアに対する攻撃が成功していることから,LED暗号においてもサイドチャネル攻撃の可能性が考えられる.本稿では,LED暗号への相関電力解析の適用について述べ,シミュレーション及び実験を通して,その手法により鍵推定が可能であることを示すとともに,本攻撃への対策法を提案する.

  122. A six-band stereoscopic video camera system for accurate color reproduction

    TSUCHIDA Masaru, SAKAI Shuji, MIURA Mamoru, ITO Koichi, KAWANISHI Takahito, KASHINO Kunio, YAMATO Junji, AOKI Takafumi

    Technical report of IEICE. PRMU 112 (385) 211-215 2013/01/23

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In order to accurate color reproduction, a novel six-band stereoscopic video acquisition and visualization system using multi-spectral and stereo imaging has been proposed. The proposed system consists of two consumer-model digital cameras and an interference filter whose spectral transmittance is comb shaped. In the process of generating a six-band image, the Phase-Only Correlation (POC) is used to find accurate corresponding points between the stereo image pair, and projective transformation whose parameters are estimated from the correspondence is used to correct geometric relationship between the images. The Wiener estimation method is used for color reproduction. The all image processing steps after image capture is implemented on GPUs and the frame rate of the system is 30 fps is achieved when image size is XGA.

  123. A six-band stereoscopic video camera system for accurate color reproduction

    TSUCHIDA Masaru, SAKAI Shuji, MIURA Mamoru, ITO Koichi, KAWANISHI Takahito, KASHINO Kunio, YAMATO Junji, AOKI Takafumi

    Technical report of IEICE. Multimedia and virtual environment 112 (386) 211-215 2013/01/23

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In order to accurate color reproduction, a novel six-band stereoscopic video acquisition and visualization system using multi-spectral and stereo imaging has been proposed. The proposed system consists of two consumer-model digital cameras and an interference filter whose spectral transmittance is comb shaped. In the process of generating a six-band image, the Phase-Only Correlation (POC) is used to find accurate corresponding points between the stereo image pair, and projective transformation whose parameters are estimated from the correspondence is used to correct geometric relationship between the images. The Wiener estimation method is used for color reproduction. The all image processing steps after image capture is implemented on GPUs and the frame rate of the system is 30 fps is achieved when image size is XGA.

  124. A six-band stereoscopic video camera system for accurate color reproduction

    2013 (33) 1-5 2013/01/16

  125. Side-channel Attacks Exploiting Leaked Information from Cryptographic Modules

    HOMMA Naofumi, AOKI Takafumi

    Systems, control and information 57 (12) 505-510 2013

    Publisher: Institute of Systems, Control and Information Engineers

    ISSN: 0916-1600

  126. A Study of a Disparity Map Generation Method Combining Motion Estimation and Image Correspondence Matching for Stereo Video

    27 35-40 2012/11/28

    Publisher: [電子情報通信学会信号処理研究専門委員会]

    ISSN: 1881-4654

  127. A countermeasure against power analysis attacks on KCipher-2 and its evaluation

    2012 (3) 749-756 2012/10/23

  128. The Available Telecommunications Services at Serious Disaster

    SHOJI Sadao, AOKI Takafumi, ITO Akinori, OMACHI Shinichiro, ITO Koichi

    IEICE technical report 112 (208) 71-72 2012/09/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    Hitachi East Japan Solutions, Ltd. And Tohoku University study the Available Telecommunications Services and Security and Information Sharing in case of Overcrowding of Mobile Communications Network at Serious Disaster.

  129. 車載ステレオカメラを用いた障害物検出のための性能評価手法の検討

    和泉 圭祐, 三浦 衛, 伊藤 康一, 青木 孝文

    映像情報メディア学会技術報告 36 (34) 43-46 2012/08/27

    Publisher: 一般社団法人映像情報メディア学会

    ISSN: 1342-6893

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    車載ステレオカメラを用いた障害物検出は,さまざまなアルゴリズムが提案されている.一方で,性能評価には検出率のみが用いられ,現在までに,定量的な検出精度の評価が行われていない.これに対して本稿では,障害物の真値領域とアルゴリズムによって障害物として検出された領域との関係に着目する定量的な評価指標を提案するとともに,網羅的な性能評価実験を通して,障害物検出アルゴリズムの詳細な性能分析を行う.

  130. 投影面の時間的変化に対応したプロジェクタ・カメラシステムとその性能評価

    山中 佑人, 酒井 修二, 伊藤 康一, 青木 孝文

    映像情報メディア学会技術報告 36 (34) 19-22 2012/08/27

    Publisher: 一般社団法人映像情報メディア学会

    ISSN: 1342-6893

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    本稿では,投影面の時間的変化に対応したプロジェクタ・カメラシステムを提案する.提案システムでは,ステレオカメラを用いて投影面の3次元形状を計測し,計測結果に基づいて幾何補正を行うことで,映像コンテンツを投影しながらに投影画像の幾何補正が可能である.また,性能評価実験を通して,投影画像を高精度に幾何補正できることを示す.

  131. A Study of a Disparity Map Generation Method Combining Image Segmentation and Image Correspondence Matching for Stereo Video

    25 361-366 2012/07/30

    Publisher: [電子情報通信学会]

  132. A Study of Image Registration Method Using High-Accuracy Correspondence Matching for Medical Images : From X-Ray Images to Volume Data

    ITO Koichi, TAJIMA Yuichiro, AOYAMA Shoichiro, AOKI Takafumi

    IEICE technical report. 112 (142) 91-96 2012/07/12

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a registration method using high-accuracy correspondence matching for medical images. The phase information obtained by discrete Fourier transform of images allows us to estimate accurate transnational displacement and evaluate reliable similarity between images. In this paper, we demonstrate the effectiveness of our method through a set of experiments for aligning dental X-ray images, CT and MRI.

  133. Image-Based Biometric Authentication : Toward a Unified Biometrics Technique Applicable to Different Modalities

    18 (7) 57-62 2012/07

    Publisher: テクノタイムズ社

    ISSN: 1341-3961

  134. An Investigation of a Mechanism of Intentional Electromagnetic Interference to a Cryptographic Module

    HAYASHI Yu-ichi, HOMMA Naofumi, MIZUKI Takaaki, AOKI Takafumi, SONE Hideaki

    2012 (6) 23-27 2012/06/22

  135. A Study on Non-Rigid Volume Registration Using 3D Phase-Only Correlation

    TAJIMA Yuichiro, ITO Koichi, AOKI Takafumi

    IEICE technical report. Image engineering 112 (36) 107-112 2012/05/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Volume registration is an essential technology for comparing medical volume data acquired in different days and for combining different types of volume data from various imaging devices. For accurate comparison, it is necessary to correct non-rigid deformation between volume data, since the complex deformation between medical volume data is observed even if they are taken from the same regions of the subject. This paper proposes a novel non-rigid registration method using 3D Phase-Only Correlation (POC). The proposed method achieves accurate and fast volume registration by employing POC-based block matching (with small volume blocks), which can find the voxel correspondence with sub-voxel accuracy between two volume data. The proposed method exhibits higher accuracy and shorter computation time compared with the conventional method, and is effective even for multimodality cases such as CT-MRI registration.

  136. ガロア体上の算術演算回路の自動生成システムの構築

    岡本 広太郎, 本間 尚文, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2012 232-232 2012

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2012.0_232  

  137. 投影面の時間的変化に対応したプロジェクタ・カメラシステムの検討

    山中 佑人, 酒井 修二, 伊藤 康一, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2012 63-63 2012

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2012.0_63  

  138. 車載ステレオカメラを用いた障害物検出手法の正確さに関する評価指標

    和泉 圭祐, 三浦 衛, 伊藤 康一, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2012 62-62 2012

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2012.0_62  

  139. D-16-7 A Fast Correspondence Matching Method for Medical Volume Data Based on GPU Computing

    Fudano Kinya, Tajima Yuichiro, Ito Koichi, Aoki Takafumi

    Proceedings of the IEICE General Conference 2 203-203 2012

    Publisher: The Institute of Electronics, Information and Communication Engineers

  140. Toward Machine Vision Technology Overcoming the Pixel Resolution Limit -From 3D Vision to Biometric Authentication-

    2011 (1) 1-6 2011/10/17

  141. Improved Side Channel Attack using Multivariate RegressionAnalysis

    2009 1-6 2011/10/12

  142. A study of a Palmprint Authentication Algorithm for Mobile Phones

    24 128-133 2011/08/01

    Publisher: [電子情報通信学会]

  143. ステレオ式ワンショット型6バンド画像撮影システムによる3D物体の正確な色再現

    土田勝, 酒井修二, 伊藤康一, 川西隆仁, 柏野邦夫, 大和淳司, 青木孝文

    画像の認識・理解シンポジウム(MIRU2011)論文集 2011 1066-1071 2011/07/20

  144. 位相限定相関法に基づく多視点画像からのデプスマップ生成の検討

    酒井修二, 伊藤康一, 青木孝文, 運天弘樹

    画像の認識・理解シンポジウム(MIRU2011)論文集 2011 1347-1354 2011/07/20

  145. 汎用デジタルカメラを用いた2視点からの3次元復元システム

    三浦衛, 酒井修二, 石井純平, 伊藤康一, 青木孝文

    画像の認識・理解シンポジウム(MIRU2011)論文集 2011 1707-1708 2011/07/20

  146. 3D Reconstruction from Two Views Using Consumer Digital Camera

    2011 (4) 1-8 2011/03/10

    Publisher: 情報処理学会

    ISSN: 2186-2583

  147. Performance Evaluation of Real-Time Stereo Correspondence on GPU

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan 2011 31-31 2011

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI: 10.11528/tsjc.2011.0_31  

  148. ステレオ動画像の動き推定とグラフカットを用いた視差マップ生成手法の検討

    佐々木 満春, 伊藤 康一, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2011 117-117 2011

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2011.0_117  

  149. ストリーム暗号KCipher-2のハードウェア実装評価

    響 崇史, 齋藤 和也, 本間 尚文, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2011 115-115 2011

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2011.0_115  

  150. SIFTとPOCを用いた高精度3次元復元の検討

    石井 純平, 酒井 修二, 伊藤 康一, 青木 孝文

    電気関係学会東北支部連合大会講演論文集 2011 118-118 2011

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2011.0_118  

  151. Efficient countermeasure against fault injection attacks on modular exponentiation algorithms

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan 2011 3-3 2011

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI: 10.11528/tsjc.2011.0_3  

  152. A Study of a Contactless Palmprint Recognition Algorithm for Mobile Phones

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan 2011 27-27 2011

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI: 10.11528/tsjc.2011.0_27  

  153. SIFTとPOCを用いた高精度3次元復元とその応用(若葉研究者の集い1,サマーセミナー2011(若葉研究者の集い))

    石井 純平, 酒井 修二, 伊藤 康一, 青木 孝文

    映像情報メディア学会技術報告 35 17-20 2011

    Publisher: 一般社団法人 映像情報メディア学会

    DOI: 10.11485/itetr.35.33.0_17  

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    本稿では,SIFT(Scale-Invariant Feature Transform)と位相限定相関法(Phase-Only Correlation:POC)とを組み合わせることで,ステレオ画像間の変形に対してロバストで高精度かつ密な対応付けが可能な手法を提案する.基線長が長いステレオカメラを用いた場合,3次元復元の精度が向上する一方で,画像変形が大きくなり密な対応付けが困難になる.提案手法を用いることで,変形が大きいステレオ画像間においても密な対応付けを行い,高精度な3次元復元を実現する.

  154. 位相限定相関法に基づく動き推定とグラフカットを用いたステレオ動画像の視差マップ生成手法の検討(若葉研究者の集い2,サマーセミナー2011(若葉研究者の集い))

    佐々木 満春, 伊藤 康一, 青木 孝文

    映像情報メディア学会技術報告 35 35-38 2011

    Publisher: 一般社団法人 映像情報メディア学会

    DOI: 10.11485/itetr.35.33.0_35  

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    本稿では、位相限定相関法(Phase-Only Correlation:POC)に基づく動き推定とグラフカットを用いたステレオ動画像の視差マップ生成手法を提案する.グラフカットを用いたステレオ動画像の視差マップ生成手法は,時間軸方向で結果が安定せず,処理時間が長いという問題がある.提案手法では,動画像の動きを考慮することで,視差マップ生成の安定性の向上と処理時間の削減を実現する.

  155. 1-6 A Content-Based Correspondence Algorithm for Volume Data Using 3D POC

    TAJIMA Yuichiro, ITO Koichi, AOKI Takafumi

    PROCEEDINGS OF THE ITE ANNUAL CONVENTION 2011 1-6-1-_1-6-2_ 2011

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/iteac.2011.0_1-6-1  

    ISSN: 1343-1846

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    In this paper, we propose a novel correspondence search technique for volume data based on 3D Phase-Only Correlation (POC), and discuss a personal identfication method using volume data. The proposed approach provides high accuracy correspondence breaking the limit of over voxel resolution and exhibits high performance for personal identification.

  156. 高精度画像マッチングとその応用 ピクセル分解能の壁を越えるビジョンシステムを目指して

    青木孝文

    日立TO技報 16 2-5 2010/10

  157. 個人識別における歯科X線画像の活用 Invited

    小菅栄子, 青木孝文

    法医病理 16 (2) 109-115 2010/10

  158. B-18-4 Proposal of a Remote Authentication System Using Touchless Palmprint Recognition

    Ota Haruki, Watanabe Ryu, Ito Koichi, Tanaka Toshiaki, Aoki Takafumi

    Proceedings of the Society Conference of IEICE 2010 (2) 384-384 2010/08/31

    Publisher: The Institute of Electronics, Information and Communication Engineers

  159. Realtime 3D Morphable Model Fitting Method by Project Space Coordinate Model

    HOSOI Tomoki, KOBAYASHI Koji, ITO Koichi, AOKI Takafumi

    IEICE technical report 110 (97) 25-30 2010/06/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    3D Morphable Model (3DMM) fitting is an excellent method for detecting 3D shape of an object from a 2D image. But, it takes a few minutes or seconds at one 3DMM fitting and this drawback prevents its use from real-time applications. In this paper, we propose a novel 3DMM fitting method. In proposed method, the model which is constructed from the project space data set is used, and the fitting method is developed by using AAM fitting method extended to 3D space. From the results of experiments, it has been shown that the proposed method successfully reproduced a photo-realistic 3D shape from a single 2D image at a real-time speed of 100ms.

  160. BT-4-4 Image Matching Based on Phase Information and Its Application to Biometric Authentication

    Ito Koichi, Aoki Takafumi

    Proceedings of the IEICE General Conference 2010 (2) "SS-47"-"SS-48" 2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  161. 位相限定相関法による高精度画像マッチング--人体の画像計測および医用画像処理への適用を例として

    宮澤 一之, 伊藤 康一, 青木 孝文

    画像ラボ 21 (3) 2-7 2010/03

    Publisher: 日本工業出版

    ISSN: 0915-6755

  162. 楕円曲線暗号ハードウェアの電力解析による安全性評価

    齋藤和也, 菅原健, 本間尚文, 青木孝文, 佐藤証

    電気関係学会東北支部連合大会講演論文集 2010 2010

  163. ハッシュ関数Luffaのハードウェア実装

    佐藤証, 片下敏宏, 菅原健, 本間尚文, 青木孝文

    情報処理学会シンポジウムシリーズ(CD-ROM) 2010 (1) 2010

    ISSN: 1882-0840

  164. 大規模災害のための歯科X線画像認識システムと性能評価(若葉研究者の集い2,サマーセミナー(若葉研究者の集い))

    青山 章一郎, 伊藤 康一, 青木 孝文, 小菅 栄子, 篠原 瑞男

    映像情報メディア学会技術報告 34 27-30 2010

    Publisher: 一般社団法人 映像情報メディア学会

    DOI: 10.11485/itetr.34.34.0_27  

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    歯科X線画像は,大規模災害時の身元確認のように,一般的な個人識別に有用とされる身体的特徴を用いることのできない状況においても,個人識別の手段として有用である.本稿では,複数入力・複数登録の歯科X線画像照合システムを提案するとともに,実際の歯科医院で診療に使われた約5年分の歯科X線画像を用いた性能評価実験を通して有効性を実証する.

  165. 位相限定相関法を用いた3次元計測の高精度化と性能評価(若葉研究者の集い3,サマーセミナー(若葉研究者の集い))

    酒井 修二, 高橋 徹, 伊藤 康一, 青木 孝文

    映像情報メディア学会技術報告 34 43-46 2010

    Publisher: 一般社団法人 映像情報メディア学会

    DOI: 10.11485/itetr.34.34.0_43  

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    本稿では,位相限定相関法(Phase-Only Correlation:POC)とScaled Window Matchingを組み合わせたScaled Window-POCに基づく画像変形にロバストなステレオ画像の対応付け手法を提案する.基線長が長いステレオカメラを用いた場合,3次元計測の精度が向上する一方で,画像変形が大きくなることで対応付けが困難になるという問題がある.提案手法を用いることで,変形が大きいステレオ画像間においても高精度な対応付けを行い,基線長の拡大による3次元計測の高精度化を実現する.

  166. 位相限定相関法に基づく画像マッチングのGPU実装とその応用(若葉研究者の集い4,サマーセミナー(若葉研究者の集い))

    三浦 衛, 高橋 徹, 伊藤 康一, 青木 孝文

    映像情報メディア学会技術報告 34 63-66 2010

    Publisher: 一般社団法人 映像情報メディア学会

    DOI: 10.11485/itetr.34.34.0_63  

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    本稿では,位相限定相関法(Phase-Only Correlation:POC)に基づく画像マッチングをGPUに実装するとともに,それを用いて実時間で動作する3次元計測システムを提案する.ステレオビジョンに基づく3次元計測では,POCに基づく画像マッチングを用いることで高精度な計測が可能であるが,計算コストが実用上の問題であった.そこで,ステレオ画像の対応付けが基準点毎に並列であることを利用して,GPU実装による高速化を図る.また,人物の顔の3次元形状を実時間で計測するシステムを構築し,GPU実装の有効性を実証する.

  167. 歯科情報を有効活用した迅速な身元確認の実現 Peer-reviewed

    小菅栄子, 青木孝文

    デンタルトリビューン 20 2009/10

  168. 歯科情報データベースと身元確認支援システム Peer-reviewed

    小菅栄子, 青木孝文

    デンタルトリビューン 14 2009/09

  169. L-008 Template Attack on AES Hardware Implementations

    Kim Yongdae, Sugawara Takeshi, Homma Naofumi, Aoki Takafumi, Satoh Akashi

    8 (4) 139-146 2009/08/20

    Publisher: Forum on Information Technology

  170. I-049 A Study of Scale Estimation Algorithms Using Phase-Only Correlation for Electron Microscope Images

    Suzuki Ayako, Ito Koichi, Aoki Takafumi, Tsuneta Ruriko

    8 (3) 345-346 2009/08/20

    Publisher: Forum on Information Technology

  171. RG-002 A Study of a High-Accuracy Image Matching Algorithm Using Phase-Only Correlation for Dental Radiographs and Dental CT Data

    Hanzawa Yuki, Ito Koichi, Aoki Takafumi, Inagaki Masafumi, Kawamata Ryota, Kosuge Eiko

    8 (2) 103-108 2009/08/20

    Publisher: Forum on Information Technology

  172. C-039 High-Bandwidth Signal Measurement Using Bandwidth Interleaving Technique

    Pratama Fajar Mega, Miyazawa Kazuyuki, Homma Naofumi, Aoki Takafumi, Yamaguchi Takahiro J., Degawa Katsuhiko, Akita Takayuki

    8 (1) 527-534 2009/08/20

    Publisher: Forum on Information Technology

  173. A Countermeasure of Side Channel Attack on a Cryptographic LSI by Means of Magnetic Thin Film and Its Experimental Verification

    TORIZUKA Hideki, SANDEEP Dhungana, YAMAGUCHI Masahiro, SUGAWARA Takeshi, HOMMA Naofumi, AOKI Takafumi, SATOH Akashi

    2009 (76) 33-38 2009/08/07

  174. RFマイクロ磁界プローブによる暗号LSIへの差分電磁波解析とその抑制法

    鳥塚英樹, DHUNGANA S., 山口正洋, 菅原健, 本間尚文, 青木孝文, 佐藤証

    日本磁気学会学術講演概要集 33rd 2009

    ISSN: 1882-2959

  175. RSA暗号プロセッサジェネレータの設計と評価

    馬場祐一, 宮本篤志, 本間尚文, 青木孝文, 佐藤証

    情報科学技術フォーラム講演論文集 8th 2009

  176. 周波数領域での暗号モジュールの電力解析

    菅原健, 本間尚文, 林優一, 水木敬明, 青木孝文, 曽根秀昭, 佐藤証

    情報科学技術フォーラム講演論文集 8th 2009

  177. Magnetic Near Field Measurement of Cryptographic LSI using On-Chip Integrated Micro Magnetic Field Probe

    TORIZUKA Hideki, YAMAGUCHI Masahiro, SUGAWARA Takeshi, HOMMA Naofumi, SATOH Akashi, AOKI Takafumi

    ITE Technical Report 33 37-42 2009

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.33.15.0_37  

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    Increasingly a side channel attack which is to break a cryptographic key using the electromagnetic radiation and power consumption from the cryptographic module regard as a dangerous. In this paper, the magnetic near field of cryptographic LSI was measured using the on-chip integrated micro magnetic field probe with a shielded-loop coil. As a result, the high frequency current in cryptographic LSI was able to be shown as a distribution map. Moreover, when the cryptographic key was estimated by differential electromagnetic analysis, the time of the key presumption is earlier than a place away from the cryptographic IP core, and it has been found that the vulnerability of the cryptographic LSI is seen on the core. It was confirmed that the magnetic near field was able to be suppressed by putting a magnetic film on the cryptographic LSI, and it became a means to protect cryptographic LSI from side channel attack.

  178. 位相限定相関法に基づく虹彩認証アルゴリズムとその高性能化--低画質な虹彩画像に対してもロバストな認証を実現

    宮澤 一之, 伊藤 康一, 青木 孝文

    画像ラボ 19 (10) 5-10 2008/10

    Publisher: 日本工業出版

    ISSN: 0915-6755

  179. A Study of a Face Recognition Algorithm Using Phase-Only Correlation

    HAYASAKA Akihiro, ITO Koichi, AOKI Takafumi, NAKAJIMA Hiroshi, KOBAYASHI Koji

    IEICE technical report 108 (214) 47-52 2008/09/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper proposes a 2D face recognition algorithm using Phase-Only Correlation (POC). A major problem in face recognition is that the recognition performance is significantly influenced by the facial expression changes. The facial expression changes decrease the recognition performance in the both cases of using 2D facial images and 3D face data. Addressing this problem, we propose a 2D face recognition algorithm using Phase-Only Correlation for face images with expression change. Our proposed algorithm consists of two steps: (i) normalize rotation and scaling using feature points on face images and (ii) calculate the matching scores using the POC-based sub-pixel correspondence search. Experimental evaluation using the AR Face Database demonstrates efficient recognition performance of the proposed algorithm.

  180. A Study of a Face Recognition Algorithm Using Phase-Only Correlation

    HAYASAKA Akihiro, ITO Koichi, AOKI Takafumi, NAKAJIMA Hiroshi, KOBAYASHI Koji

    IEICE technical report 108 (213) 47-52 2008/09/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper proposes a 2D face recognition algorithm using Phase-Only Correlation (POC). A major problem in face recognition is that the recognition performance is significantly influenced by the facial expression changes. The facial expression changes decrease the recognition performance in the both cases of using 2D facial images and 3D face data. Addressing this problem, we propose a 2D face recognition algorithm using Phase-Only Correlation for face images with expression change. Our proposed algorithm consists of two steps: (i) normalize rotation and scaling using feature points on face images and (ii) calculate the matching scores using the POC-based sub-pixel correspondence search. Experimental evaluation using the AR Face Database demonstrates efficient recognition performance of the proposed algorithm.

  181. A Study of a Face Recognition Algorithm Using Phase-Only Correlation

    HAYASAKA Akihiro, ITO Koichi, AOKI Takafumi, NAKAJIMA Hiroshi, KOBAYASHI Koji

    IPSJ SIG Notes 2008 (92) 47-52 2008/09/18

    Publisher: Information Processing Society of Japan (IPSJ)

    ISSN: 0919-6072

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    This paper proposes a 2D face recognition algorithm using Phase-Only Correlation (POC).A major problem in face recognition is that the recognition performance is significantly influenced by the facial expression changes. The facial expression changes decrease the recognition performance in the both cases of using 2D facial images and 3D face data. Addressing this problem, we propose a 2D face recognition algorithm using Phase-Only Correlation for face images with expression change. Our proposed algorithm consists of two steps: (i) normalize rotation and scaling using feature points on face images and (ii) calculate the matching scores using the POC-based sub-pixel correspondence search. Experimental evaluation using the AR Face Database demonstrates efficient recognition performance of the proposed algorithm.

  182. A Palmprint Recognition Algorithm Using Principal Component Analysis Based on Phase Information

    IITSUKA Satoshi, MIYAZAWA Kazuyuki, ITO Koichi, AOKI Takafumi, KOBAYASHI Koji, NAKAJIMA Hiroshi

    IPSJ SIG Notes. CVIM 2008 (82) 201-206 2008/08/29

    Publisher: Information Processing Society of Japan (IPSJ)

    ISSN: 0919-6072

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    Phase information in 2D Discrete Fourier Transforms (DFTs) of images has significant role in image matching. So far, we have proposed image matching technique called Phase-Only Correlation (POC) which uses only phase information of images, and have shown its effectiveness in various applications such as biometrics authentication. However, in biometrics authentication, high computational cost due to numerous calculations of 2D DFTs can be a drawback of POC-based method when we identify input data from huge database. Addressing the problem, we take palmprint recognition as an example, and propose a recognition algorithm which performs principal component analysis on the phase information of the palmprint images. Through a set of experiments, we demonstrate that the proposed method can significantly reduce computational cost without sacrificing recognition performance compared with the conventional POC-based algorithm.

  183. A Palmprint Recognition Algorithm Using Principal Component Analysis Based on Phase Information

    IITSUKA Satoshi, MIYAZAWA Kazuyuki, ITO Koichi, AOKI Takafumi, KOBAYASHI Koji, NAKAJIMA Hiroshi

    IEICE technical report 108 (199) 199-204 2008/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Phase information in 2D Discrete Fourier Transforms (DFTs) of images has significant role in image matching. So far, we have proposed image matching technique called Phase-Only Correlation (POC) which uses only phase information of images, and have shown its effectiveness in various applications such as biometrics authentication. However, in biometrics authentication, high computational cost due to numerous calculations of 2D DFTs can be a drawback of POC-based method when we identify input data from huge database. Addressing the problem, we take palmprint recognition as an example, and propose a recognition algorithm which performs principal component analysis on the phase information of the palmprint images. Through a set of experiments, we demonstrate that the proposed method can significantly reduce computational cost without sacrificing recognition performance compared with the conventional POC-based algorithm.

  184. RI-006 Performance Evaluation of a Feature-Based Geometric Correction Method for Projected Images

    Takahashi Toru, Numa Norihito, Aoki Takafumi, Kondo Satoshi

    7 (3) 21-23 2008/08/20

    Publisher: Forum on Information Technology

  185. A palmprint recognition algorithm using phase-only correlation and its performance improvement

    21 177-182 2008/04/21

    Publisher: [電子情報通信学会]

  186. A study of a robust 3D face recognition algorithm under varying facial expression

    21 459-464 2008/04/21

    Publisher: [電子情報通信学会]

  187. 高基数モンゴメリ乗算に基づくRSA暗号の高性能ハードウェア実装

    馬場祐一, 宮本篤志, 本間尚文, 青木孝文, 佐藤証

    電気関係学会東北支部連合大会講演論文集 2008 2008

  188. High-performance Error Detection Hardware Architecture for Block Cipher AES

    佐藤証, 菅原健, 本間尚文, 青木孝文

    情報処理学会シンポジウムシリーズ(CD-ROM) 2008 (1) 2008

    ISSN: 1882-0840

  189. High-performance Hardware Architectures for the Hash Function Whirlpool Based on Shift-register Architecture

    菅原健, 本間尚文, 青木孝文, 佐藤証

    情報処理学会シンポジウムシリーズ(CD-ROM) 2008 (1) 2008

    ISSN: 1882-0840

  190. Differential Power Analysis Experiments using an ASIC on a Standard Evaluation Board

    菅原健, 本間尚文, 青木孝文, 佐藤証

    情報処理学会シンポジウム論文集 2008 (8) 2008

    ISSN: 1344-0640

  191. Enhanced CPA using Key Screening Techniques

    片下敏宏, 佐藤証, 菅原健, 本間尚文, 青木孝文

    情報処理学会シンポジウム論文集 2008 (8) 2008

    ISSN: 1344-0640

  192. Side-channel Attack by Using Leakage Information on Power Cables

    林優一, 菅原健, 本間尚文, 水木敬明, 青木孝文, 曽根秀昭, 佐藤証

    情報処理学会シンポジウム論文集 2008 (8) 2008

    ISSN: 1344-0640

  193. Experimental evaluation of chosen-message power analysis attacks against RSA implementations

    宮本篤志, 本間尚文, 青木孝文, 佐藤証

    情報処理学会シンポジウムシリーズ(CD-ROM) 2008 (1) 2008

    ISSN: 1882-0840

  194. B-18-1 FPGA Implementation of a Fingerprint Recognition Algorithm Using Phase-Only Correlation

    Sakuma Ken, Iino Toru, Ito Koichi, Aoki Takafumi

    Proceedings of the IEICE General Conference 503 503-503 2008

    Publisher: The Institute of Electronics, Information and Communication Engineers

  195. Phase-Only Correlation and Its Application to Biometric Authentication(Tutorial Lecture)

    ITO Koichi, AOKI Takafumi, NAKAJIMA Hiroshi, KOBAYASHI Koji

    ITE Technical Report 32 17-24 2008

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.32.58.0_17  

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    This paper summarizes a high-accuracy image matching technique called Phase-Only Correlation (POC). The Phase-Only Correlation is an image matching technique using the phase components in 2D Discrete Fourier Transforms (DFTs) of given images. This technique has been successfully applied to a wide range of applications, such as industrial image recognition, passive 3D measurement, biometric authentication, video signal processing, etc. In this paper, we present applications of POC to fingerprint, iris, palmprint, face and dental radiograph recognition.

  196. An Experimental Study of Sub-Pixel Motion Estimation

    NUMA Norihito, AOKI Takafumi

    IEICE technical report 107 (288) 31-36 2007/10/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In this paper, we present an experimental study of sub-pixel motion estimation techniques for video sequences. Motion estimation is indispensable for many applications such as video coding, super-resolution imaging, and computer vision, etc. We evaluate the accuracy of sub-pixel motion estimation techniques using three block matching algorithms : Sum of Absolute Differences (SAD), Sum of Squared Differences (SSD), and Phase-Only Correlation (POC). For the evaluation, we use mesh-based motion compensation. From the experimental result, we confirmed that the three matching algorithms are able to achieve the same level of sub-pixel accuracy motion estimation.

  197. A Passive 3D Face Recognition System and Its Performance Evaluation

    HAYASAKA Akihiro, SHIBAHARA Takuma, ITO Koichi, AOKI Takafumi, NAKAJIMA Hiroshi, KOBAYASHI Koji

    IEICE technical report 107 (288) 37-42 2007/10/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper proposes a three-dimensional (3D) face recognition system using passive stereo vision. So far, the reported 3D face recognition techniques have used active 3D measurement methods to capture high-quality 3D facial information. However, active methods employ structured illumination (structure projection, phase shift, moire topography, etc.) or laser scanning, which is not desirable in many human recognition applications. Addressing this problem, we propose a face recognition system that uses (i) passive stereo vision to capture 3D facial information and (ii) 3D matching using an ICP (Iterative Closest Point) algorithm. Experimental evaluation demonstrates efficient recognition performance of the proposed system which is comparable with that of an active 3D face recognition system.

  198. Arithmetic Module Generation Using Optimized Parallel Prefix Adders

    WATANABE Yuki, HOMMA Naofumi, AOKI Takafumi, HIGUCHI Tatsuo

    IEICE technical report 107 (103) 49-54 2007/06/15

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents an arithmetic module generator using parallel prefix adders. In the proposed system, parallel prefix adders in a generated module can be optimized using the signal arrival profile of input signals. The proposed generator first generates an arithmetic module according to the design specification, and then evaluates the performance of the generated module in terms of the internal signal delay. Using the evaluation result, the system re-generates the parallel prefix adder block so as to optimize the circuit delay. In this paper, we demonstrate that we can improve the total performance of multipliers, constant-coefficient multipliers and multiply-accumulators using the re-generated prefix adders.

  199. High-accuracy rotation estimation algorithm based on 1D phase-only correlation and its evaluation

    20 173-178 2007/04/23

    Publisher: [電子情報通信学会]

  200. A palmprint recognition algorithm using phase-only correlation and its performance evaluation

    The 20th Workshop on Circuits and Systems in Karuizawa, April 23-24, 2007 20 625-630 2007/04/23

    Publisher: [電子情報通信学会]

  201. Optimal design of multiple-valued arithmetic circuits using counter tree diagrams

    20 361-366 2007/04/23

    Publisher: [電子情報通信学会]

  202. Performance Comparison of the ISO Standard Block Ciphers in ASICs

    SUGAWARA Takeshi, HOMMA Naofumi, AOKI Takafumi, SATOH Akashi

    IEICE technical report 106 (595) 111-118 2007/03/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents performance comparison of the ISO/IEC18033 standard block ciphers (AES, Camellia, SEED, TDEA, MISTY1, and CAST-128) in ASICs. Each algorithm was implemented with a loop architecture where one round function block is iteratively used. In some designs, we finely divided the round operation into a few stages to reduce the hardware resource. These designs were synthesized by using a 0.18-μm CMOS standard cell library, and performances in size and speed were evaluated.

  203. Simple Power Analysis Using Steady Value Inputs against RSA Hardware Implementation

    宮本篤志, 本間尚文, 青木孝文, 佐藤証

    情報処理学会シンポジウムシリーズ(CD-ROM) 2007 (1) 2007

    ISSN: 1882-0840

  204. Enhanced Power Analysis on Cryptographic Modules Using Waveform Filtering

    長嶋聖, 本間尚文, 菅原健, 青木孝文, 佐藤証

    情報処理学会シンポジウムシリーズ(CD-ROM) 2007 (1) 2007

    ISSN: 1882-0840

  205. Experimental evaluation of chosen-message SPA attacks against RSA implementations

    宮本篤志, 本間尚文, 青木孝文, 佐藤証

    情報処理学会シンポジウム論文集 2007 (10) 2007

    ISSN: 1344-0640

  206. Power analysis experiments against cryptographic hardware on a side-channel attack standard evaluation FPGA board

    菅原健, 本間尚文, 青木孝文, 佐藤証

    情報処理学会シンポジウムシリーズ(CD-ROM) 2007 (1) 2007

    ISSN: 1882-0840

  207. Formal Verification Method for Arithmetic Circuits and Its Evaluation

    WATANABE Yuki, HOMMA Naofumi, AOKI Takafumi, HIGUCHI Tatsuo

    IEICE technical report 106 (387) 17-22 2006/11/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents the formal design of arithmetic circuits based on arithmetic description language called ARITH. By using ARITH, we can describe a wide variety of arithmetic algorithms including those using unconventional number systems. The functionality of arithmetic algorithms in ARITH can be formally verified using formula manipulation methods. In this paper, we compare the proposed formula-based method with the conventional *BMD-based method, and demonstrate that the combination of the two methods enables to verify arithmetic circuits in an efficient way.

  208. Phase-Only Correlation and Its Applications : From 3D Vision to Biometrics

    AOKI Takafumi

    IEICE technical report 106 (374) 31-38 2006/11/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper summarizes recent advancements and possible applications of the Phase-Only Correlation (POC) technique---a high-accuracy image matching technique using phase information of discrete Fourier transform. Since 1990s, our research group has developed a technique of high-accuracy phase-based image matching for biometric authentication and achieved commercial application of fingerprint verification units. The same technique was also successfully applied to image recognition systems for industrial applications. Recently, our group has proposed an efficient correspondence search algorithm using POC, which can find pairs of corresponding points between the given images with sub-pixel accuracy. This makes possible to apply the POC technique to a variety of computer vision applications. Potential application examples include 3D vision, video signal processing, super resolution, microscope image analysis and image-based biometrics using iris, palmprint, dental radiograph and 3D face.

  209. LVQ-Based Video Object Extraction and Its Performance Improvement

    SUMPENO Surya, MOCHAMAD Hariadi, ITO Koichi, AOKI Takafumi

    IEICE technical report 106 (374) 51-56 2006/11/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a semi-automatic algorithm for video object extraction. The proposed algorithm assumes the use of multiple key video frames in which a semantic object of interest is denned in advance with human assistance. For video frames between every two key frames, the specified video object is tracked and segmented automatically using Learning Vector Quantization (LVQ). Each pixel of a video frame is represented by a 5-dimensional feature vector integrating spatial and color information. This paper also presents a technique for improving extraction performance of the proposed algorithm. Experimental evaluation using MPEG standard test video sequences demonstrates that the proposed algorithm can extract the video object with 1% average error.

  210. A Study on Implementation-Oriented Iris Recognition Algorithm Based on Phase-Only Correlation

    MIYAZAWA Kazuyuki, ITO Koichi, AOKI Takafumi, KOBAYASHI Koji, NAKAJIMA Hiroshi

    IEICE technical report 106 (374) 45-50 2006/11/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a modification of iris recognition algorithm using Phase-Only Correlation (POC) dedicated to system implementation. In order to reduce the size of registration iris data and to prevent the visibility of iris images, we introduce the idea of 2D Fourier Phase Code (2D FPC) for representing iris information. 2D FPC corresponds to the quantized version of phase-spectrum of an iris image, which is essential for phase-based iris recognition. By the use of 2D FPC, while keeping a sufficient level of performance, the size of iris data can be reduced to below one-quarter compared to using iris image directly as the registration data. By changing the degree of quantization in 2D FPC, we can optimize the trade-off between iris data size and recognition performance flexibly.

  211. A Scale Estimation Algorithm Based on Phase-Only Correlation for Electron Microscope Images and Its Performance Improvement

    NAGASHIMA Sei, AOKI Takafumi, TSUNETA Ruriko

    ITE technical report 30 (33) 41-44 2006/06/27

    Publisher: 映像情報メディア学会

    ISSN: 1342-6893

  212. High-Accuracy Image Matching beyond the Limit of Pixel Resolution : From 3D Machine Vision to Biometrics

    AOKI Takafumi

    ITE technical report 30 (33) 21-28 2006/06/27

    Publisher: 映像情報メディア学会

    ISSN: 1342-6893

  213. An Iris Recognition Algorithm Based on Phase-Only Correlation

    MIYAZAWA Kazuyuki, ITO Koichi, AOKI Takafumi, KOBAYASHI Koji, NAKAJIMA Hiroshi

    ITE technical report 30 (33) 45-48 2006/06/27

    Publisher: 映像情報メディア学会

    ISSN: 1342-6893

  214. A Study on a 3D Face Recognition System Using Passive Stereo Vision

    HAYASAKA Akihiro, SHIBAHARA Takuma, ITO Koichi, AOKI Takafumi, NAKAJIMA Hiroshi, KOBAYASHI Koji

    ITE technical report 30 (32) 5-8 2006/06/26

    Publisher: 映像情報メディア学会

    ISSN: 1342-6893

  215. A High-Resolution Waveform Analysis Based on Phase-Only Correlation and Its Application to Side-Channel Attacks

    IMAI Yuichi, HOMMA Naofumi, NAGASHIMA Sei, AOKI Takafumi, SATOH Akashi

    IEICE technical report 105 (665) 97-103 2006/03/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a high-resolution waveform alignment method using a Phase-Only Correlation (POC) technique and its application to side-channel attacks against cryptosystems. In general, power analysis attacks, such as SPA and DPA, require a statistical analysis of power waveforms to reduce noise and to retrieve secret information. However, the waveform data often include displacement errors in the measurement. The use of phase components in discrete Fourier transforms of waveforms makes it possible to estimate the displacements between signal waveforms with higher resolution than the sampling resolution. The effectiveness of power analysis attacks can be enhanced using the super-resolution alignment method. In this paper, we demonstrate the potential of the enhanced attacks through a set of experimental DPAs against DES software implementation on a Z80 processor.

  216. D-12-58 Implementation of a High-Accuracy Passive 3D Measurement System Based on Phase-Only Correlation

    Ota Shinichi, Shibahara Takuma, Uchida Naohide, Numa Norihito, Oshino Takayuki, Aoki Takafumi

    Proceedings of the IEICE General Conference 2006 (2) 190-190 2006/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  217. High-Resolution Differential Power Analysis Using Waveform Matching Based on Phase-Only Correlation

    今井裕一, 本間尚文, 長嶋聖, 青木孝文, 佐藤証

    情報処理学会シンポジウム論文集 2006 (11) 2006

    ISSN: 1344-0640

  218. A Compact ASIC Implementation of the 64-bit Block Cipher CAST-128

    菅原健, 本間尚文, 青木孝文, 佐藤証

    情報処理学会シンポジウム論文集 2006 (11) 2006

    ISSN: 1344-0640

  219. Experimental Evaluation of RSA Circuit against SPA on an FPGA Platform

    宮本篤志, 本間尚文, 青木孝文, 佐藤証

    情報処理学会シンポジウム論文集 2006 (11) 2006

    ISSN: 1344-0640

  220. High-Resolution Differential Power Analysis Using Waveform Matching Based on Phase-Only Correlation

    今井裕一, 本間尚文, 長嶋聖, 青木孝文, 佐藤証

    情報処理学会シンポジウム論文集 2006

    ISSN: 1344-0640

  221. A Compact ASIC Implementation of the 64-bit Block Cipher CAST-128

    菅原健, 本間尚文, 青木孝文, 佐藤証

    情報処理学会シンポジウム論文集 2006

    ISSN: 1344-0640

  222. 漏洩電磁波による共通鍵暗号処理ハードウェアの動作解析

    菅原健, 本間尚文, 青木孝文, 佐藤証

    電気関係学会東北支部連合大会講演論文集 2006 2006

  223. Experimental Evaluation of RSA Circuit against SPA on an FPGA Platform

    宮本篤志, 本間尚文, 青木孝文, 佐藤証

    情報処理学会シンポジウム論文集 2006

    ISSN: 1344-0640

  224. テクノトレンド 位相情報に基づく画像マッチングとその応用--マシンビジョンからバイオメトリクス認証まで

    青木 孝文

    自動認識 18 (14) 38-42 2005/12

    Publisher: 日本工業出版

  225. High-Quality Background Sprite Generation Based on Phase-Only Correlation

    NUMA Norihito, AOKI Takafumi, KONDO Satoshi

    IEICE technical report. Signal processing 105 (349) 49-54 2005/10/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A background sprite is an image composed of pixels belonging to a video object visible throughout a video segment. This paper proposes a high-quality background sprite generation method using phase-based image matching. The key issues in creating a high-quality background sprite are accurate global motion estimation and foreground object removal. Our proposed method employs (i) a phase-based sub-pixel motion estimation technique using the Phase-Only Correlation (POC) function, and (ii) a foreground object masking technique using the peak value of the POC function as a reliability measure for motion estimation. Experimental observation shows that the proposed method can generate high-quality background sprites for many practical video sequences, where the image quality is evalutaed by the PSNR between the reconstracted background image and the original one.

  226. I-022 A Fingerprint Matching Algorithm Based on the Combination of Phase-Only Correlation and Minutiae Matching

    Morita Ayumi, Ito Koichi, Aoki Takafumi, Nakajima Hiroshi, Kobayashi Koji, Higuchi Tatsuo

    4 (3) 51-54 2005/08/22

    Publisher: Forum on Information Technology

  227. Formal Design of Arithmetic Circuits with Arithmetic Description Language: ARITH

    WATANABE Yuuki, HOMMA Nofumi, AOKI Takahumi, HIGUCHI Tatsuo

    Technical report of IEICE. VLD 105 (148) 37-42 2005/06/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a design of parallel multipliers based on arithmetic description language called ARITH. The multiplication algorithms in ARITH can be verified formally by formula manipulations. In this paper, we also present an application of ARITH to a multiplier module generator. The proposed system generates 352 types of parallel multipliers including those using unconventional number systems such as redundant number systems.

  228. A Scale Estimation Algorithm Based on Phase-Only Correlation for Electron Microscope Images

    NAGASHIMA Sei, AOKI Takafumi, TSUNETA Ruriko

    Technical report of IEICE. VLD 105 (148) 19-24 2005/06/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a scale estimation algorithm based on Phase-Only Correlation (POC) for electron microscope images. The proposed method can estimate the scale factor and translational displacements between a reference image and an input image with high-accuracy. Significant improvement in scale estimation performance can be achieved by extracting a common region between the reference image and input image. Experimental evaluation using the Mandelbrot picture as a precisely scale-controlled image shows that the proposed method can estimate the scale factor in approximately 0.2[%]-scale accuracy, where the image size is 401×401[pixel], the scale factor is about 1000 and the scale is estimated with 16 stages (thus, the scale factor of each stage is about 1.54). This paper also describes an application of the proposed algorithm to magnification calibration for electron microscope images.

  229. Optimal Design of Fast Adders Based on Redundant Number Systems

    HOMMA Naofumi, AOKI Takahumi, HIGUCHI Tatsuo

    Technical report of IEICE. VLD 105 (148) 31-36 2005/06/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a unified representation of fast addition algorithms called Counter Tree Diagrams (CTDs) and its application to the optimal design of redundant arithmetic adders. By using CTDs, we can obtain possible constant-time redundant adders in a systematic way without using specific knowledge about underlying addition algorithms. The potential of the proposed approach is demonstrated through an experimental design of the optimal RB adders. The result shows that the obtained RB adder achieves about 30-40% higher performance in terms of power-delay product compared with the conventional designs.

  230. High-Accuracy Motion Estimation for Video Sequences Based on Phase-Only Correlation

    NUMA Norihito, LOY Hui Chien, AOKI Takafumi, KONDO Satoshi

    Technical report of IEICE. VLD 105 (148) 7-12 2005/06/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In this paper, we present a high-accuracy Phase-Only Correlation (POC)-based motion estimation method for video sequences. Robust motion estimation is indispensable for many applications such as mesh-based video coding, stereo vision, and super-resolution imaging. In our proposed method, the motion vector of a point in a video frame is adaptively switched between motion vectors obtained by two motion estimation methods: (i) POC-based hierarchical search and (ii) POC-based full search. This approach can reliably detect both global and local motion in video sequences. We evaluate the robustness of our proposed method in mesh-based motion compensation. Experimental results show that our proposed method performs significantly better than conventional full search using Sum of Absolute Differences (SAD).

  231. A Fingerprint Matching Algorithm Based on Phase-Only Correlation and Its Evaluation

    ITO Koichi, MORITA Ayumi, AOKI Takafumi, HIGUCHI Tatsuo, NAKAJIMA Hiroshi, KOBAYASHI Koji

    Technical report of IEICE. VLD 105 (147) 61-66 2005/06/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A major approach for fingerprint recognition today is to extract minutiae from fingerprint images and to perform fingerprint matching based on the number of corresponding minutiae pairings. One of the most difficult problems in fingerprint recognition has been that the recognition performance is significantly influenced by fingertip surface condition, which may vary depending on environmental or personal causes. Addressing this problem, this paper presents a fingerprint recognition algorithm using Phase-Only Correlation (POC). The use of phase components in two-dimensional discrete Fourier transforms of fingerprint images makes possible to achieve highly robust fingerprint recognition for low-quality fingerprints. Experimental evaluation using a set of fingerprint images captured from fingertips with difficult conditions (e.g., dry fingertips, rough fingertips, allergic-skin fingertips) demonstrates an efficient recognition performance of the proposed algorithm compared with a typical minutiae-based algorithm.

  232. High-Accuracy Stereo Vision System Based on Phase-Only Correlation and Its Application to Metal Component Inspection

    SHIBAHARA Takuma, AOKI Takafumi, YAMAGE Yoshihiro, ONO Masakazu

    Technical report of IEICE. VLD 105 (147) 73-78 2005/06/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper proposes a high-accuracy stereo vision system for measuring geometric parameters of through-holes in metal components. A measurement procedure in our system consists of the following steps: feature-based measurement, area-based measurement and model fitting measurement. The feature-based measurement reconstructs edge points of a through-hole using epipolar-geometry-based stereo correspondence. The area-based measurement reconstructs inner walls of the through-hole using a sub-pixel stereo image matching technique based on Phase-Only Correlation (POC). The cylinder model fitting measurement fits a geometric model of a cylinder to 3D data of the edge points and inner walls in order to measure position, radius and direction of the through-hole.

  233. High-Accuracy Stereo Vision System Based on Phase-Only Correlation and Its Application to 3D Face Matching

    UCHIDA Naohide, SHIBAHARA Takuma, AOKI Takafumi, NAKAJIMA Hiroshi, KOBAYASHI Koji

    Technical report of IEICE. VLD 105 (147) 67-71 2005/06/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper proposes a face recognition system using passive stereo vision to capture three-dimensional (3D) facial information. So far, the reported 3D face recognition techniques assume the use of active 3D measurement for 3D facial capture. However, active methods employ structured illumination or laser scanning, which is not desirable in many human recognition applications. A major problem of using passive stereo vision system for 3D measurement is its low accuracy. Addressing this problem, we have newly developed a high-accuracy 3D measurement system based on passive stereo vision, where Phase-Only Correlation (POC) is employed for sub-pixel disparity estimation. This paper presents the first attempt to create a practical 3D face recognition system on the basis of a passive 3D measurement technique.

  234. AS-2-4 Phase-Based Image Matching and Its Applications : Toward Image Processing Technology beyond the Limit of Pixel Resolution

    Aoki Takafumi

    Proceedings of the Society Conference of IEICE "S-27"-"S-28" 2005

    Publisher: The Institute of Electronics, Information and Communication Engineers

  235. RC-003 Design and Evaluation of RSA Processor Generator

    Baba Yuichi, Miyamoto Atsushi, Homma Naofumi, Aoki Takafumi, Satoh Akashi

    8 (1) 129-135 2005

    Publisher: Forum on Information Technology

  236. Development of a Multiplier Module Generator Using Arithmetic Description Language

    ISHIDA Kazuya, HOMMA Naofumi, AOKI Takafumi, HIGUCHI Tatsuo

    2004 (122) 239-244 2004/12/02

    Publisher: Information Processing Society of Japan (IPSJ)

    ISSN: 0919-6072

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    This paper presents a design method for arithmetic circuits using an arithmetic description language: ARITH. The use of ARITH makes possible (i) formal description of arithmetic algorithms, (ii) formal verification of described arithmetic algorithms, and (iii) translation of arithmetic algorithms to equivalent HDL codes. This paper also presents an application of ARITH to a multiplier module generator. The developed generator can handle over 250 types of multiplication algorithms, and produce the multiplier modules whose functions are. completely verified at the algorithmic level.

  237. Development of a Multiplier Module Generator Using Arithmetic Description Language

    ISHIDA Kazuya, HOMMA Naofumi, AOKI Takafumi, HIGUCHI Tatsuo

    IEICE technical report. Dependable computing 103 (482) 169-174 2004/12/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a design method for arithmetic circuits using an arithmetic description language: ARITH. The use of ARITH makes possible (i) formal description of arithmetic algorithms, (ii) formal verification of described arithmetic, algorithms, and (iii) translation of arithmetic algorithms to equivalent HDL codes. This paper also presents an application of ARITH to a multiplier module generator. The developed generator can handle over 250 types of multiplication algorithms, and produce the multiplier modules whose functions are completely verified at the algorithmic level.

  238. SC-11-14 Performance Evaluation of Programmable Digital Filter LSIs Based on Multiple-Valued Current-Mode Logic

    Degawa Katsuhiko, Aoki Takafumi, Higuchi Tatsuo

    Proceedings of the IEICE General Conference 2004 (2) "S-77"-"S-78" 2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  239. A-3-10 Design of Redundant Binary Adders Using Counter Tree Diagrams

    Wakamatsu Taihei, Homma Naofumi, Sakiyama Jun, Aoki Takafumi, Higuchi Tatsuo

    Proceedings of the IEICE General Conference 2004 77-77 2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  240. Shortest Path Search Using Excitable Digital Reaction-Diffusion System

    Ito Koichi, Nagata Satoru, Aoki Takafumi, Higuchi Tatsuo

    Proceedings of the IEICE General Conference 2003 41-41 2003/03/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  241. Parallel Octave for Cluster Computers

    FUJIWARA Hayato, AOKI Takafumi, HIGUCHI Tatsuo

    Technical report of IEICE. DSP 102 (168) 55-60 2002/06/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a high-level design and prototyping environment for parallel signal processing algorithms using GNU Octave. Octave is (i) a high-level interactive language, primarily intended for numerical computations, (ii) a free computation tool based on GPL, and is (iii) mostly compatible with MATLAB. In this paper, we extend Octave to parallel language, called "parallel Octave", and its pefformance is evaluated on an experimental 16-node PC cluster system. Parallel Octave supports an easy way for the design and implementation of parallel-distributed signal processing algorithms.

  242. Design of VLSI-Oriented Redundant Addition Algorithms Using CTDs

    SAKIYAMA Jun, AOKI Takafumi, HIGUCHI Tatsuo

    Technical report of IEICE. DSP 102 (167) 137-142 2002/06/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents Counter Tree Diagrams (CTDs) for designing redundant addition algorithms. By using CTDs, one can describe and analyze arbitrary adder architectures in a systematic way without using specific knowledge about underlying arithmetic algorithms. Examples of adder architectures considered in this paper include Redundant-Binary (RB) adders, Signed-Digit (SD) adders, Positive-Digit (PD) adders, parallel counters (e.g., 3-2 counters and 4-2 counters) and networks of such basic adders/counters. This paper also presents an application of CTDs to the design of fast adders with limited carry propagation.

  243. A Shortest Path Algorithm Using Excitable Dynamics

    NAGATA Satoru, AOKI Takafumi, HIGUCHI Tatsuo

    IEICE technical report. Nonlinear problems 102 (68) 13-18 2002/05/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Recently, model-based studies of morphogenesis employing computer simulations have begun to attract much attention in mathematical biology. Morphogenesis can be described and modeled mathematically by reaction-diffusion system. We proposed a Digital Reaction-Diffusion System (DRDS) a model of a discrete-time discrete-space reaction-diffusion system for non-linear signal processing tasks: typical examples include enhancement and restoration of fingerprint images as well as generation of biological textures for computer graphics applications. In this paper, we present the design of a special DRDS that emulates characteristic behavior of excitable dynamics, and demonstrate its application to a shortest path search problem. The proposed DRDS employs reaction kinetics used in FitzHugh-Nagumo system, and generates traveling waves, which are useful for finding the shortest paths in 2-D and 3-D spaces.

  244. High-Precision Image Registration Based on Phase-Only Correlation

    SASAKI Yoshifumi, TAKITA Kenji, AOKI Takafumi, HIGUCHI Tatsuo, KOBAYASHI Koji

    IEICE Tech. Rep. 102 (15) 49-54 2002/04/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    High-precision image registration is of fundamental importance in various computer vision and remote sensing algorithms. The authors have investigated high-precision image registration techniques based on phase-only correlation (POC), which make possible to detect image translation and rotation with sub-pixel accuracy and can be applied to various different target objects without modifying the basic algorithm. This paper presents the principle of high-precision image registration using POC for detecting image translation and rotation. Performance evaluation through basic experiments shows that the POC-based registration algorithm can detect image translation in about 1/100-pixel accuracy and image rotation in about 1/30-degree accuracy.

  245. Multi Camera Stereo Vision based on Phase-Only Correlation Technique

    TAKITA Kenji, AOKI Takafumi, HIGUCHI Tatsuo, KOBAYASHI Koji

    IEICE technical report. Image engineering 102 (15) 55-60 2002/04/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a new 3D measurement algorithm using passive stereo vision techniques. The key idea is to use Phase-Only Correlation (POC) for disparity estimation. POC is a image registration technique with subpixel accuracy and is useful for high-precision disparity estimation in stereo images. This paper describes a multi-camera stereo vision system with six CCD cameras. Experimental results show that the algorithm can achieve the accuracy of about 1 mm in 3D measurement when the distance between stereo cameras is 7 cm and the distance between the camera pair and the target object is 70 cm.

  246. A 3-D Measurement Algorithm Using a Variable-Window Phase-Only Correlation Technique and Its Evaluation

    TAKITA Kenji, AOKI Takafumi, HIGUCHI Tatsuo, KOBAYASHI Koji

    Proceedings of the Society Conference of IEICE 2001 156-156 2001/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

  247. Fingerprimt Image Processing Based on a Model of Biological Pattern Formation

    ITO Koichi, AOKI Takafumi, HIGUCHI Tatsuo

    Proceedings of the Society Conference of IEICE 2001 96-96 2001/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

  248. 学術の窓 ディジタル信号処理とコンピューティング(3)ディジタルモルフォジェネシス--生物の形態形成モデルに基づく信号処理アルゴリズム

    青木 孝文, 樋口 龍雄

    信号処理 5 (3) 173-182 2001/05

    Publisher: 〔信号処理学会〕

    ISSN: 1342-6230

  249. Implementation and Evaluation of Parallel Octave on a PC Cluster

    FUJIWARA Hayato, AOKI Takafumi, HIGUCHI Tatsuo

    Proceedings of the IEICE General Conference 2001 150-150 2001/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  250. Evaluation of a Fault-Tolerant FPGA with Self-Repair Capability

    Abe Shigeki, Aoki Takafumi, Higuchi Tatsuo, Kanomata Akio

    Proceedings of the IEICE General Conference 2001 (1) 169-169 2001/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  251. Restoration of Fingerprint Images Using Digital Reaction-Diffusion System and Its Evaluation

    ITO Koichi, AOKI Takafumi, HIGUCHI Tatsuo

    IEICE technical report. Nonlinear problems 100 (518) 19-26 2000/12/14

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a Digital Reaction-Diffusion System(DRDS)-a model of discrete-time descrete-space reaction-diffusion dynamical systems-for intelligent signal processing applications. The original idea is based on the Turing's model of pattern formation which is widely known in mathematical biology. We first show that the Turing's morphogenesis can be understood by the pattern forming property of the digital reaction-diffusion system and that the system's behavior can be analyzed within the framework of multidimensional digital signal processing theory. This paper also presents an application of DRDS to fingerprint restoration. We design an adaptive DRDS having the capability of restoring incomplete fingerprint images and evaluate its performance.

  252. Evolutionary Graph Generation Technique Using Terminal Color Constraint

    NATSUI Masanori, AOKI Takafumi, HIGUCHI Tatsuo

    Proceedings of the Society Conference of IEICE 2000 5-5 2000/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  253. Design of an Adaptive Digital Reaction Diffusion System

    ITO Koichi, AOKI Takafumi, HIGUCHI Tatsuo

    Proceedings of the Society Conference of IEICE 2000 61-61 2000/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  254. A Field-Programmable Gate Array Architecture with Fault Detection and Recovery Capability

    ABE Shigeki, AOKI Takafumi, HIGUCHI Tatsuo, KANOMATA Akio

    FTS2000-1 100 (30) 1-8 2000/04/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Due to the exponential growth of the density and capacity of VLSI technology, it becomes increasingly difficult to achieve higher performance while keeping a high level of system reliability.In order to construct highly reliable systems with next-generation VLSI technology, not only the improvements in fabrication technology, but also active measures are required to deal with temporary/permanent hardware faults in integrated components.This paper investigates the potential of Field-Programmable Gate Arrays(FPGAs)to realize reliable systems with self-repair capability.We propose a new FPGA architecture that can detect hardware faults during operation, and can recover the correct function by reconfiguring its structure.

  255. Design of High-Radix Parallel VLSI Dividers

    NAKAZAWA Kimihiko, AOKI Takafumi, HIGUCHI Tatsuo

    Proceedings of the IEICE General Conference 2000 86-86 2000/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  256. Design of a Field-Programmable Digital Filter IC Using Multiple-Valued Current-Mode Circuits

    ENDO Masakatsu, AOKI Takafumi, HIGUCHI Tatsuo

    Technical report of IEICE. VLD 99 (262) 15-22 1999/08/27

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a Field Programmable Digital Filter (FPDF)IC -a special-purpose FPGA for high-speed FIR filtering- using binary SD (redundant binary) arithmetic algorithms and multiple-valued current-mode circuit technology. Recently, field-programmable integrated circuits, such as FPGAs, have attracted much attention in signal processing community due to their rapid prototyping capability. However, it is very difficult to obtain high-speed, compact and low-power implementations because of the overhead associated with programmable interconnections. Addrassing this problem, this paper pressents an FPDF architecture that employs carry-propagation-free redundant arithmetic algorithmsfor faster computation and multiple-valued current-mode circuit technology for high-density low-power implementation. The prototype FPDF fabrication with 0.6μm CMOS technology demonstrates that the chip area and power consumption can be reduced to 41% and 50%, respectively, compared with the standard binary logic implementation.

  257. Design of Digital Signal Processing FPGA Architecture Using New Redundant Number Representation

    SAWADA Yoshiki, AOKI Takafumi, HIGUCHI Tatsuo

    Technical report of IEICE. VLD 98 (446) 61-68 1998/12/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    This paper presents "Signed-Weight Number System (SW Number System)", which is useful for designing high-speed multiply-add modules for digital signal processing applications. The SW number system makes possible the unified representation of positive and negative numbers by adjusting the signs of individual digit positions. Compared with the conventional two's complement representation, the SW nymber representation, the SW number representation makes possible the constuction of highly regular arithmetic circuits without introducing irregular arithmetic operations, such as sign extension and LSB compensation. This paper also presents the design of a Field Programmable Digital Filter (FPDF) IC-a special-purpose FPGA for high-speed FIR filtering-based on the proposed SW arithmetic. The result of the experimental fabrication of test circuits is also described.

  258. Design of Digital Reaction-Diffusion System for Fingerprint Image Processing

    FUJITA Wataru, AOKI Takafumi, HIGUCHI Tatsuo

    IEICE technical report. Nonlinear problems 98 (406) 9-16 1998/11/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    This paper presents a digital reaction-diffusion system-a model of discrete-time discrete-space reaction-diffusion dynamical systems-for intelligent signal processing applications. The original idea is based on the Turing's model of pattern formation which is widely known in mathematical biology. We first show that the Turing's morphogenesis can be understood by the pattern forming property of the digital reaction-diffusion system and that the system's behavior can be analyzed within the framework of multidimensional digital signal processing theory. This paper also describes a design of an adaptive digital reaction-diffusion system for image processing tasks, such as enhancement and restoration of fingerprint images.

  259. A Hardware Algorithm of a Variable-Radix CORDIC Processor

    57 24-25 1998/10/05

  260. Rotation Measurements using Rotation Invariant Phase Only Correlation

    SASAKI Hiroshi, KOBAYASHI Koji, AOKI Takafumi, KAWAMATA Masayuki, HIGUCHI Tatsuo

    ITE Technical Report 22 (45) 55-60 1998/09/14

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.22.45.0_55  

    ISSN: 1342-6893

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    Rotation Invariant Phase Only Correlation (RIPOC) is one of the applications of Phase Only Correlation (POC). RIPOC can correlate two images even though there is rotation between two images. It is also able to measure the rotation angle between two images. Like POC, RIPOC processes images macroscopically so it can correlate the images of which characteristic points are difficult to be extracted. We present the experimental results of the ability to detect the rotation angle by RIPOC.

  261. Evolutionary Generation of Arithmetic Circuit Structures

    HOMMA Naofumi, AOKI Takafumi, HIGUCHI Tatsuo

    Technical report of IEICE. DSP 98 (144) 61-68 1998/06/26

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a new approach to designing arithmetic circuits by using a graph-based evolutionary optimization technique called Evolutionary Graph Generation (EGG).The key idea of the proposed method is to introduce a higher level of abstraction for arithmetic algorithms, in which arithmetic circuit structures are modeled as data-flow graphs associated with specific number representation systems.When evaluating a data-flow graph, an edge and a node are interpreted as a set of active digits and a set of digit operations under the specified number system.The EGG system employs evolutionary operations to transform the structure of the graphs directly, which makes it possible to generate the optimum structure in the search space efficiently.The potential capability of EGG is demonstrated through an experiment of generating constant-coefficient multipliers.

  262. Redundant Complex Number System and Its Application

    HOSHI Kenichi, AOKI Takafumi, HIGUCHI Tatsuo

    Technical report of IEICE. VLD 97 (577) 111-118 1998/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    This paper presents a class of complex number representations called Redundant Complex Number Systems, which are useful for designing VLSI signal processors with complex arithmetic capability.A redundant complex number system(RCNS)is defined as a positional number system that has a complex radix rj, where r is an integer that is not less than 2 and j denotes the imaginary unit(i.e., j^2=-1).This system employs a redundant integer digit set{-α, …, 0, …, α}, where&lceil;r^2/2&rceil;&le;α&le;r^2-1.The use of the imaginary radix rj with the redundant digit set makes possible the construction of high-speed complex arithmetic circuits exhibiting highly regular structure.This paper discusses elementary arithmetic algorithms of RCNSs and their implementations:examples include a complex-number parallel adder with no carry propagation, and a complex-number multiplier using fast binary-tree addition structure.

  263. Design of Arithmetic Algorithms Based on Evolutionary Graph Generation System

    HOMMA Naofumi, AOKI Takafumi, HIGUCHI Tatsuo

    Proceedings of the IEICE General Conference 1998 101-101 1998/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  264. Filtering on Phase Only Correlation Domain and its Applications

    ITE Technical Report 21 (42) 31-36 1997/07/22

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.21.42.0_31  

    ISSN: 1342-6893

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    Phase Only Correlation is a pattern matching algorithm which replaces magnitude components of two input images with a constant in the process of calculating ordinary correlation. POC is known to have good discrimination characteristics producing intense peak on correlation domain if two images have common components. For images in which phase components are dominant, manipulation in correlation domain such as inclusion or exclusion of a peak have an filtering effect on spatial images, such as enhancement of spatial signals or noises. New filtering algorithm named Correlation Domain Filtering is proposed.

  265. Design of Reconfigurable Arithmetic Circuits Using Redundant Complex Number Systems

    AMADA Hiroaki, AOKI Takafumi, HIGUCHI Tatsuo

    IPSJ SIG Notes 1996 (67) 9-16 1996/07/24

    Publisher: Information Processing Society of Japan (IPSJ)

    ISSN: 0919-6072

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    This paper presents a hardware algorithm for a real/complex reconfigurable arithmetic unit, which can change it's structure for three arithmetic modes in real time. The three modes realize (i) a single precision complex-number multiplication, (ii) a double precision real-number multiplication, and (iii) a pair of single precision real-number four-input multiply additions, respectively. We discuss the reconfiguration of the hardware structure and its efficiency on the basis of algebraic similarity among number systems used in the three arithmetic modes. This paper also discusses the design of the proposed arithmetic unit using standard binary logic circuits.

  266. A Consideration on High - Radix CORDIC Algorithms

    NOGI Hitoshi, AOKI Takafumi, HIGUCHI Tatsuo

    IPSJ SIG Notes 1996 (67) 1-8 1996/07/24

    Publisher: Information Processing Society of Japan (IPSJ)

    ISSN: 0919-6072

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    One of the problems of the CORDIC algorithm is that its convergence speed is proportional to the bit-length of the arithmetic unit. This paper proposes a new redundant CORDIC algorithm that employs a higher radix r(&le;2) in microrotation. The use of higher radices makes possible the reduction of number of iterations. The major drawback of the high-radix CORDIC algorithms is the increased complexity in digit selection process for microrotatiorn. In this algorithm, by converting the representation of each angular remainder into partially non-redundant representation, the digit for microrotation can be obtained directly from the integer part of the angular remainder. Also, using the proposed algorithm, we can control the trade-off between processing latency and circuit complexity by changing radix value r(r&ge;2) and digit set D according to design specifications.

  267. Principles of Phase Only Correlation and Its Applications

    KOBAYASHI Koji, NAKAJIMA Hiroshi, AOKI Takafumi, KAWAMATA Masayuki, HIGUCHI Tatsuo

    ITEJ Technical Report 20 (41) 1-6 1996/07/16

    Publisher: The Institute of Image Information and Television Engineers

    ISSN: 0386-4227

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    A new pattern matching algorithm named Phase Only Correlation (POC) is proposed. POC is defined as modified correlation such that the magnitude components of the Fourier transformed images are replaced with a constant. Discrimination capability of POC is far superior to that of correlation in that the autocorrelation of POC becomes Dirac's delta function. POC is easily integrated into an LSI, and will be popular in various application areas because of its superb characteristics and wide range of applicability.

  268. A High-Radix Division Algorithm without Quotient Digit Selection Tables

    Tokoyo Hiroshi, Aoki Takafumi, Higuchi Tatsuo

    Proceedings of the IEICE General Conference 1996 (2) 155-155 1996/03/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

  269. New Computing Paradigm Based on Multiplexing of Signals

    AOKI Takafumi, HIGUCHI Tatsuo

    Proceedings of the Society Conference of IEICE 1995 (2) 293-294 1995/09/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  270. Fingerprint Verification Algorithm Using Phase Factor of Fourier Transform

    Nakajima Hiroshi, Kobayashi Koji, Aoki Takafumi, Kawamata Masayuki, Higuchi Tatsuo

    Proceedings of the Society Conference of IEICE D-206 1995

    Publisher: The Institute of Electronics, Information and Communication Engineers

  271. Wave-Parallel Computing Based on Multi-Carrier Coherent Detection and Its Application

    YUMINAKA Yasushi, AOKI Takafumi, HIGUCHI Tatsuo

    1994 (2) 181-181 1994/09/26

    Publisher: The Institute of Electronics, Information and Communication Engineers

  272. Design and evalution of optical multiplex Computing systems based on a multiwave OEIC model

    Watanabe Yukio, Aoki Takafumi, Higuchi Tatsuo

    IEICE technical report. Computer systems 94 (14) 81-88 1994/04/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    A new computing architecture based on multiwavelength opto- electronic integrated circuits(multiwave OEICs)is proposed to overcome the communication bottleneck in highly,parallel systems. In this paper,we present a possible model of multiwave OEICs to evaluate areas of multiwave computing circuits as a function of the number of available wavelength components and other key parameters.Also,the systematic multiplexing scheme of shuffle- network-based parallel processing structures is discussed to analyze the impact of multiwave computing on the design of highly parallel systems.We also discuss near-future applications of multiwave computing concept.

  273. バイオ素子モデルに基づく集合論理演算システムに関する研究

    青木 孝文

    東北大学電通談話会記録 61 (2) p270-274 1993/03

    Publisher: 東北大学電気通信研究所工学研究会

    ISSN: 0385-7719

  274. Post-Binary VLSI System : Interconnection-Free Computing System

    KAMEYAMA Michitaka, AOKI Takafumi, HIGUCHI Tatsuo

    The Journal of the Institute of Electronics,Information and Communication Engineers 75 (4) 400-406 1992/04/25

    Publisher: 電子情報通信学会

    ISSN: 0913-5693

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Research Projects 37

  1. 学習表現に基づく安全なバイオメトリクス技術の体系化

    伊藤 康一, 青木 孝文, 大木 哲史, 西垣 正勝

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(A)

    Institution: 東北大学

    2023/04/01 - 2027/03/31

  2. プランクトンAI画像判別計数システムによる湖沼・ダム湖生態系監視手法の確立と展開

    占部 城太郎, KASS Jamie, 藤原 直樹, 一瀬 諭, 安達 孝実, 辻 彰洋, 牧野 渡, 伊藤 康一, 青木 孝文, 樋村 正雄, 杉島 英樹, 堀江 啓史, 吉成 暁, 阿部 真己, 高橋 巧

    Offer Organization: 独立行政法人環境再生保全機構

    System: 環境研究総合推進費

    2024/04 - 2027/03

  3. 画像に基づくバイオ・人工物メトリクスの統合的フレームワークの確立

    青木 孝文, 伊藤 康一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 東北大学

    2021/04/01 - 2024/03/31

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    本年度は,以下の2項目について研究を実施した. 1. 画像に含まれるID情報の抽出・識別・分類・加工・保護・転写などの基本操作を検討した.具体的には,(A) 画像中に含まれる生体/人工物が有する対象固有の特徴量を抽出する「ID情報の抽出」アルゴリズムとして,画像の位相情報および畳み込みニューラルネットワークから抽出された画像特徴量との組み合わせを検討した.(B) ID情報に基づいた識別・分類を行う「ID情報の識別・分類」アルゴリズムとして,(A)で得られた特徴量に対する類似度評価アルゴリズムを検討した.(C) ID情報の圧縮,符号化,暗号化,ハッシュ化などの「ID情報の加工・保護」アルゴリズムとして,ステガノグラフィとの組み合わせによる新しい保護アルゴリズムを検討した.(D) 人物画像から抽出したID情報を転写・保持する「ID情報の転写(埋め込み)」アルゴリズムについて,その基本アイディアに関する基礎実験を行った. 2. 項目1で検討する基本操作に基づいて,①手や顔を対象とするバイオメトリクス,②なりすまし攻撃の検知,③テンプレート保護,④医用画像解析,⑤法医学的個人識別,⑥物体指紋技術(人工物メトリクス),⑦認証可能アバターに関する実証研究を検討した.その中で特に,①について,非接触掌紋認証のための位置姿勢推定手法を提案した.②について,Vision Transformerを用いた高精度な検知手法を提案した.④について,ドメインの異なるデータに対する高精度なアルツハイマー病の鑑別手法を提案した.これらの成果について,学術雑誌論文への論文掲載,国際会議および国内会議で発表を行った.

  4. A Study of High-Performance Biometric Recognition Using Local Phase Features

    Ito Koichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2019/04/01 - 2022/03/31

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    Based on the knowledge obtained from our previous research on the "Phase-Only Correlation," which is a high-accuracy image matching technique that utilizes the phase information of images, we investigated local phase features dedicated to biometric recognition in this research project. We developed a set of basic algorithms for similarity evaluation based on multi-resolution local phase features, and studied various high-performance algorithms required for biometric recognition systems to meet the requirements of "anytime, anywhere, anyone, easily, and securely". In addition, we applied local phase features to contactless palmprint/vein recognition, neonate fingerprint recognition, iris recognition, and face recognition in order to demonstrated their effectiveness.

  5. Development and Applications of Extremely Accurate Correspondence Techniques for Multidimensional Signals Based on Phase Information

    Aoki Takafumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2018/04/01 - 2021/03/31

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    In this study, we developed a set of general-purpose image correspondence algorithms based on "high-accuracy correspondence of multidimensional signals based on local phase features represented in multiple resolutions." Through strategic application researches on biometrics, multi-view stereo 3D reconstruction, radar grammetry, and medical image analysis, we have demonstrated the effectiveness of phase-based image correspondence algorithms.

  6. Development of High-Accuracy Image Matching Techniques Using Feature Descriptors Based on Local Phase Array

    Aoki Takafumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2015/04/01 - 2018/03/31

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    This project developed a new feature descriptor called local phase array, which is defined by phase information of Fourier transform of given images, and its advanced techniques. We applied developed techniques to a wide range of applications such as robust matching of biometric images, multi-view stereo image measurement, fast and high-accuracy machine vision, image measurement for airborne SAR images and medical volume data analysis. We also implemented developed methods on GPUs and FPGAs. We demonstrated the effectiveness of local phase array through its practical applications.

  7. Development of Biological Image Matching Technology Supporting Forengic Odontology and Medicine

    Takafumi Aoki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2015/04/01 - 2017/03/31

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    In this project, we have developed automated matching technologies for 2D X-ray images such as dental radiographs, 3D images such as CT and MRI and 2D-3D heterogeneous images using Phase-Only Correlation (POC), which is a high-accuracy image matching technique using phase information of discrete Fourier transform. In addition, we have developed an individual search technology from multi-modal databases combined with dental charts and images. We have demonstrated effectiveness of the developed technologies through performance evaluation using a large-scale dataset.

  8. Development of early diagnosis and treatment for lymph node metastasis

    Kodama Tetsuya

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2014/04/01 - 2017/03/31

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    There are few pre-clinical studies of early diagnosis and treatment for lymph node (LNM). The reasons mainly are due to the lack of a noninvasive imaging system capable of monitoring metastasis over time in an appropriate animal model. We developed MXH10/Mo/lpr mice, which develop systemic swelling of LNs up to 10 mm in diameter. Here we show using MXH10/Mo/lpr mice that we developed an ultrasound/micro-CT system which consists of a high-frequency ultrasound system and a micro-CT system, and a lymphatic drug delivery system (LDDS) using acoustic liposomes (ALs) and ultrasound (US). Vascular distribution in the metastatic LNs can qualitatively expressed by the ultrasound/micro-CT system at the early stage of LNM. While, the LDDS using US and ALs delivered doxorubicin into metastatic LNs, resulting in an effective treatment for early metastatic LNs. We anticipate that our methodology could be applied clinically for early metastatic LNs.

  9. Development of formal design methodology for VLSI datapaths based on Galois-field arithmetic operations

    Homma Naofumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2013/04/01 - 2017/03/31

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    This research project developed a formal design methodology for VLSI datapaths consisting of arithmetic operations on Galois fields. First, we provided (1) a formal description for Galois-field arithmetic circuits based on polynomial basis and normal basis which are frequently used for cryptography and error-correction code, and then developed (2) a formal verification method, which is applicable to the circuit description, using computer algebra. In addition, (3) we applied the design and verification methods to a cryptographic processor. More precisely, we designed a processor datapath for AES, which is one of the ISO/IEC international standard block ciphers, by the developed method. Furthermore, we developed an automatic generator for generating a variety of Galois-field arithmetic circuits depending on various design specification.

  10. Development of volume registration method for diagnosis of metastatic lymph node of head and neck cancer by ultrasound imaging

    Sakamoto Maya

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2013/04/01 - 2017/03/31

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    To detect lymph node micrometastasis, we developed a volume registration method for analyzing the vessel structure in the lymph node by using Scale-Invariant-Feature-Transform and Phase-Only Correlation methods. The algorithm developed here was for correcting images for evaluation of ultrasound images of the experimental metastatic lymph node, and also for calculating highly accurate information of blood vessel considering the dispersion value due to temporal change of luminance information and those before and after contrast agent administration. As a result, it was possible to eliminate misalignment and noise of the ultrasound images, and also extract the microstructure of the blood vessels in the metastatic lymph node.

  11. Infrastructures for accelerating the synergy effect of software-hardware co-design

    Hiroyuki Takizawa, Kobayashi Hiroaki, Aoki Takafumi, Sano Kentaro, Egawa Ryusuke, Tada Jube, Ito Koichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2013/04/01 - 2016/03/31

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    Assuming OpenCL as a standard environment for accelerator programming, we have pointed out some missing features for supporting more various accelerator architectures,and proposed OpenCL extensions. Although OpenCL has gradually become to be used for hardware description, OpenCL C is not necessarily appropriate for describing OpenCL kernels. Hence, we have designed and implemented high productivity languages for typical computations in the fields of image processing and high performance computing. In addition, we have proposed an automatic tuning method for performance parameters, which need to be adjusted for individual accelerators. The proposed method has been implemented for evaluating its performance impacts.

  12. Image Matching Using Local Phase Features and Its Application to Biometrics

    Koichi Ito, AOKI TAKAFUMI

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2013/04/01 - 2016/03/31

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    This project have defined a new image feature called "Local phase feature" to evaluate the similarity between images accurately and developed a variety of fundamental image matching algorithms using local phase features. We have applied local phase features to biometrics, which is required to accurate evaluation of the similarity between images. We have demonstrated the effectiveness of the image matching methods using local phase features on face, iris, plamprint and finger knuckle print recognition.

  13. Development of High-Accuracy Image Matching Technology Using Phase Information and Its Applications

    AOKI Takafumi, HOMMA Naofumi, ITO Koichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2012/04/01 - 2015/03/31

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    This project developed fundamental and advanced techniques of Phase-Only Correlation (POC), which is a high-accuracy image matching technique using phase information of Fourier Transform of given images. We applied the developed POC techniques to a wide range of applications, including 3D measurement, video/image processing, machine vision, biometrics and medical image analysis. We also considered the implementation of their algorithms using the state-of-the-art GPUs toward the practical use of the developed techniques. We demonstrated effectiveness of the developed techniques through their practical applications.

  14. Development of Image-Based Person Identification Technology Supporting Forengic Odontology and Medicine

    AOKI Takafumi, ITO Koichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2012/04/01 - 2014/03/31

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    In this project, we have developed automated identification technologies for 2D X-ray images such as dental radiographs, 3D images such as CT and MRI and 2D-3D heterogeneous images using Phase-Only Correlation (POC), which is a high-accuracy image matching technique using phase information of discrete Fourier transform. We have demonstrated effectiveness of the developed technologies through large-scale experiments for performance evaluation.

  15. Applications of High-Accuracy Image Matching Technology Breaking the Limit of Pixel Resolution

    AOKI Takafumi, HOMMA Naofumi, ITO Koichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2009 - 2011

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    In this project, we have developed fundamental techniques of Phase-Only Correlation (POC)-a technique for high-accuracy registration of 1D, 2D and 3D signals using phase information of discrete Fourier transform. We have also applied the POC techniques to a wide range of applications, including smart image sensors, microscope image analysis, passive 3D vision, automotive image processing, image-based human interface, biometrics authentication, and medical image analysis.

  16. 暗号モジュールに対する高精度電磁波解析技術の開拓

    青木 孝文, 本間 尚文, 伊藤 康一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 挑戦的萌芽研究

    Category: 挑戦的萌芽研究

    Institution: 東北大学

    2009 - 2010

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    本年度は,下記の2項目に関する研究開発を実施した. 1.マイクロ磁界プローブ・RFカレントプローブを用いた電磁波解析システムの構築 マイクロ磁界プローブ・RFカレントプローブ,ディジタルオシロスコープおよび解析用PCを基本としたシステムを開発した.一般に,EMI測定を目的としたマイクロ磁界プローブやRFカレントプローブは,スペクトラムアナライザと組み合わせて使用されることが多いが,開発するシステムにおいてはディジタルオシロスコープを使用した.これは,電磁波解析において,LSI動作時の時間波形が必要とされるためである.また,得られた放射電磁波の情報(電圧に変換)を適切に解析用PCに送信するインタフェースソフトウェアを開発した.ここではディジタルオシロスコープ専用のライブラリ関数とLabVIEW環境を用いて開発を行った. 2.位相限定相関法に基づく電磁波解析向け信号処理パッケージの開発 多次元信号の超高精度マッチング技術を応用した電磁波解析向け信号処理ソフトウェアを開発した.特に,マイクロ磁界プローブ・RFカレントプローブとディジタルオシロスコープにより取得された1次元の電磁界波形データの解析に位相限定相関法(POC)を適用し,測定系のサンプリングレートを越える分解能での信号マッチングを実現した.具体的には,LabVIEWおよびMATLAB&Simulink環境上で,(1)位相限定相関法に基づく超高精度波形マッチング・ジッタ解析ライブラリ,(2)高速フーリエ変換(FFT)および各種フィルタバンクによる取得波形のスペクトル分析用ライブラリ,(3)暗号の各種統計解析ライブラリを開発した.これにより,測定から解析までの一連の流れを,本解析システムで閉じた形で実現できる環境を構築した.

  17. 暗号ハードウェアの高精度サイドチャネル解析技術の開拓

    青木 孝文, 本間 尚文, 伊藤 康一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 萌芽研究

    Category: 萌芽研究

    Institution: 東北大学

    2007 - 2008

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    平成20年度は, 以下の2項目について研究・開発を実施した. 1. ソフトウェア実装された共通鍵暗号モジュールに対する解析精度を評価した. 特に, 位相限定相関法に基づく波形マッチング技術を用いることで, 波形取得のタイミング誤差を高精度に補正可能であることを実証した. 共通鍵暗号には現在のデファクトスタンダードであるDESを用い, 実験用の差分電力解析ソフトウェアには前年度に開発したソフトウェアと連動するため, MATLABを用いた. 解析を簡単化するため, DESのラウンド15の開始時にトリガ信号を発生させ, そのタイミングで波形取得を行った. 波形の取得は, サンプリング周波数100MHz〜1GHzで行い, 提案する波形マッチングよる解析精度を周波数ごとに評価した. また, マイクロ磁界プローブによる取得に加え, 従来の電圧プローブによる取得も行い, 取得されたサイドチャネル情報の精度を比較・評価した. 2. ハードウェア実装された公開鍵暗号モジュールに対する解析精度を評価した. 公開鍵暗号にはRSA暗号を用い, 実装するRSA暗号プロセッサには高基数モンゴメリ乗算器に基づくアーキテクチャを用いた. 波形の取得およびデータの解析には前年度開発したソフトウェアを利用した。本実験では, 演算器の自乗算と乗算時の消費電力の違いに着目し, さまざまな実装の安全性を評価した. また, FPGAに内蔵されるマクロ乗算器を利用した実装も合わせて評価した. マクロ乗算器の場合であっても単純電力解析が可能かどうか評価するとともに, FPGA上に安全に公開鍵暗号モジュールを実装するための対策方法を検討した.

  18. Development of Image Processing Technology Breaking the Limit of Pixel Resolution

    AOKI Takafumi, HOMMA Naofumi, ITO Koichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2006 - 2008

  19. System Integration of Beyond-Binary Computing

    HIGUCHI Tatsuo, AOKI Takafumi, HOMMA Naofumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku Institute of Technology

    2005 - 2007

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    The present-day VLSI systems are designed on the basis of binary (radix-2) arithmetic algorithms combined with binary logic devices. As the VLSI technology scales down to deep sub-micron geometry, performance bottlenecks caused by increased wiring complexity and delay are becoming significantly severe. In order to overcome the performance bottlenecks, this research project investigates system integration based on a novel computing paradigm called "Beyond-Binary Computing". Listed below are major results of this project : 1. A hardware description language called ARITH was developed for describing hardware algorithms in VLSI systems. By using ARUM, we developed an advanced library containing high-performance arithmetic algorithms using both binary and non-binary number systems. As an application, we used the proposed library to develop a practical module generator supporting various multiplier structures. The generator is available from our website, and is widely used all over the world. 2. A new high-level design method with ARITH was developed for designing high-performance beyond-binary arithmetic circuits. The ARITH description can be transformed into a technology-dependent netlist in binary/multiple-valued fused logic. For the prototype design, we used voltage-mode and current-mode CMOS technologies for binary logic and multiple-valued logic, respectively. The process of transforming the netlist into a physical layout pattern is automatically performed by an off-the-shelf place-and-route tool. The capability of the proposed method was investigated through some arithmetic circuit designs. 3. A content-addressable memory circuits based on Single-Electron Transistors (SETs) was developed and evaluated for studying next-generation low-power LSI circuits. Also, a redox microarray for wire-free circuit integration using artificial catalyst devices was investigated experimentally. A prototype of redox microarray was demonstrated through an excitable reaction-diffusion dynamics, which was implemented by chemical reaction(e.g. B-Z reaction)waves. The visualization of the chemical waves was also investigated.

  20. 2値・多値融合論理に基づくナノエレクトロニクスの開拓

    青木 孝文, 本間 尚文

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 萌芽研究

    Category: 萌芽研究

    Institution: 東北大学

    2005 - 2006

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    平成18年度は以下の2項目について研究を行った. 1.SET/CMOS混載回路による2値・多値融合論理システムの設計技術の開発(担当:青木および本間) 前年度に検討した方式により,SET/CMOS混載回路によって実現される2値・多値融合論理システムの設計技術を開発した.まず,本研究代表者らが提案するハードウェアアルゴリズム記述言語ARITHおよびハードウェアアルゴリズム合成用データ構造CTD (Counter Tree Diagram)を用いた上位設計フローを開発した.この設計フローでは,従来の2値論理ハードウェアアルゴリズムのみならず,多値論理に基づく新しいハードウェアアルゴリズムの記述と検証を可能にした.さらに,ここで記述された2値・多値融合論理ハードウェアアルゴリズムをSET/CMOS混載回路にマッピングすることを目的とした下位設計フローを開発した.SETの物理モデルをSmartSpiceあるいはHSPICEなどに組み込んだSET/CMOS混載回路シミュレーション手法を開発するとともに,これを用いた回路の詳細設計フローの実現を検討した.SET物理モデルの作成とパラメータのチューニングには,NTT物性科学基礎研究所の協力を得た. 2.各種応用システムの設計と総合的な性能評価(担当:青木) 前年度の主要機能モジュールの設計結果を踏まえ,比較的大規模な応用システムLSIの設計を試みた.具体的には,単電子連想メモリ(CAM)の設計を行った.ここではSETによる4値SRAMセルを使用し,時分割でマルチビット/セルのデータ読み出しを行うとともに,データの照合を多入力SET論理とCMOSプリチャージ論理で実現した.この他にも,ドントケア情報の保持・検索を可能とする単電子CAMを設計し,提案技術のインパクトを総合的に評価した.

  21. High-speed subpixel image sensing technique and its applications

    AOKI Takafumi, HONMA Naofumi, HIGUCHI Tatsuo

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2003 - 2005

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    1. A high-accuracy image matching technique using Phase-Only Correlation (POC) function was developed. The newly developed technique can improve matching performance by fitting the closed-form analytical model of the correlation peak to actual two-dimensional numerical data. This technique can also be extended to a spectrum weighting POC technique, where we modify cross-phase spectrum with some weighting functions to enhance registration accuracy. We provided systematic experimental analysis of the matching performance of the proposed technique by evaluating the errors in estimating the translational displacements, the rotation angle and the scale factor. 2. Some applications of the POC-based image matching/registration technique to (i) high-accuracy scale estimation for electron microscopes, (ii) high-accuracy measurement for metal component inspection, (iii) super-resolution processing for video sequences, (iv) high-quality background sprite generation, (v) video object segmentation, and (vi) fingerprint/3D face recognition were studied. 3. System implementation techniques were investigated for developing the above applications. We studied the implementation of the application (i) on a general-purpose processor since it handles only 2D still images. On the other hand, we studied the implementations of the applications (ii)-(vi) on a digital signal processor and specific hardware.

  22. 人工的反応拡散場に基づく超並列分子コンピューティング

    青木 孝文, 平塚 眞彦

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 萌芽研究

    Category: 萌芽研究

    Institution: 東北大学

    2003 - 2004

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    平成16年度は,集積回路工学および計算機科学の観点からの以下の研究を並行して行った. 【集積回路工学の観点からの取り組み】(担当:青木および平塚)各種の非線形結合振動子系を実現する人工触媒ネットワークを設計するとともに,平成15年度に試作した2次元人工触媒素子チップをプログラムすることにより,その動作を確認した.特に,FitzHugh-南雲方程式に代表される興奮場の反応拡散ダイナミクスをチップ上で再現し,BZ反応のような動的に伝搬する化学反応波の発生を確認した.さらに,人工触媒チップの最適な幾何学的配置などについて試作実験を通して総合的に検討した.また,チップ上で発生する化学反応波の可視化,これを用いた最適経路探索のデモンストレーションを行った. 【計算機科学の観点からの取り組み】(担当:青木)平成15年度に検討した応用のうち,(i)生物系テクスチャ画像の生成,(ii)指紋画像の復元,(iii)2次元経路探索について,そのアルゴリズムをディジタル反応拡散システム(DRDS:Digital Reaction Diffusion System)の枠組みに基づいて,科学技術計算ツールMATLABおよびGNU Octave上において実装し,総合的な評価を行った.一般に,ディジタル反応拡散システムは多次元の非線形ディジタルフィルタとしてモデル化されるため,その動作解析には膨大な計算量が要求される.そこで,GNU Octaveを並列言語拡張するとともにPCクラスタ上に実装し,大規模シミュレーションを可能にした.

  23. New Developments for Beyond-Binary Computing

    HIGUCHI Tatsuo, AOKI Takafumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    2002 - 2004

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    The present-day VLSI systems are designed on the basis of binary (radix-2) arithmetic algorithms combined with binary logic devices. As the VLSI technology scales down to deep sub-micron geometry, performance bottlenecks caused by increased wiring complexity and delay are becoming significantly severe. In order to overcome the performance bottlenecks, this research project investigates new developments based on a novel computing paradigm called "Beyond-Binary Computing". Listed below are major results of this project: 1.A prototype of Arithmetic Description Language ARITH was developed. We confirmed that the use of ARITH makes possible (i) formal description of arithmetic algorithms including those using unconventional number systems, (ii) formal verification of described arithmetic algorithms, and (iii) translation of arithmetic algorithms to equivalent HDL (Hardware Description Language) codes. Impacts of ARITH were demonstrated through the development of a multiplier module generator. Also, new CAD techniques based on Evolutionary Graph Generation system were developed for designing high-performance beyond-binary arithmetic algorithms. 2.Impacts of multiple-valued current-mode logic technology were demonstrated through the design of field-programmable digital filter ICs. Also, an experimental design environment for practical multiple-valued current -mode logic circuits was developed. 3.Some applications of beyond-binary computing to high-accuracy 2D/3D image measurement techniques were studied. 4.A redox microarray for wire-free circuit integration using artificial catalyst devices, such as enzyme transistors, was developed experimentally. The redox microarray was used to demonstrate some applications of molecular computing, including optimal path planning and image processing.

  24. A Study of Massively Parallel Molecular Computing - Creating IntBrconnection'Free Computers -

    AOKI Takafumi, HIRATUKA Masahiko

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2001 - 2002

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    The exponential growth of VLSI circuit complexity causes interconnection problems to become particularly severe. This research project is to investigate a possibility of interconnectionfree molecular computing from the viewpoint of integrated circuit technlogy as well as fundametal computer science. Listed below are major results of this project: 1. We proposed a basic model of artificial catalyst devices for molecular computing, and investigated some possible approaches to device implementation. We investigated a possibility of realizing massively parallel computation using reaction-diffusion dynamics induced by a collective behavior of artificial catalyst devices, which are fabricated on a 2D substrate. As a first step for demonstrating the proposed concept, we developed an experimental model of a redox microarray consisting of a two-dimensional array of platinum microelectrodes, each of which works as an artificial catalyst device. We confirmed that the redox microarray could control reversible redox reactions in a thin liquid layer on the surface of the array, and could realize artificial excitable reacton diffusion-dynamics. We successfully observed active chemical-wave propagation within the liquid layer. 2. We investigated a systematic way of designing artificial reactiondiffusion dynamics for performong specific image/pattern processing. We employed the framework of Digital Rraction Diffusion Systems (DRDSs) --- a special class of multidimensional digital filters having pattern/texture formation capability --- for theoretical discussion. Wedveloped a new restoration algorithm for texture images, such as fingerprint images, on the basis of DRDS. We also developed a shortest path search algorithm for arbitrary 2D/3D maps using excitable DRDSs. Further investigations on a systematic way of designing molecular computing systems are deing left as future research subjects.

  25. Development of a Cluster Computing System for Evolutionary Synthesis of Hardware Algorithms

    AOKI Takafumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2000 - 2002

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    This research project is to investigate a possibility of designing arithmetic circuits automatically by employing a new evolutionary optimization, technique called Evolutionary Graph Generation(EGG). Listed below are major results of this project : 1. A parallel EGG system based on the coarse-grained model of parallel processing was developed for synthesizing arithmetic circuits efficiently. 2. An experimental 11-node Linux PC cluster was built for implementing the parallel EGG system. 3. A new version of EGG system that can be used to synthesize heterogeneous networks of various different components such as analog/digital-mixed components was proposed. The new EGG system with terminal-color constraint was proved to be useful for reducing search space of possible circuit configurations. 4. The performance of the developed EGG system was evaluated through a set of experiments for synthesizing various arithmetic circuits including constant-coefficient multipliers, constant-coefficient multiply-adders, bit-serial adders, bit-serial constant-coefficient multipliers, bit-seril constant-coefficient multiply-adders and current-mode logic circuits. Our observation shows that EGG is suitable for circuit design problems that can be handled by circuit graphs with up to 50 nodes. 5. A new evolutionary operation called "transmigration" was investigated for accelerating EGG's evolution process. Further investigations on a general-purpose EGG framework for practical applications are being left as future research subjects.

  26. A Study on Beyond-Binary Computing

    HIGUCHI Tatsuo, YUMINAKA Yasushi, AOKI Takafumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    1999 - 2001

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    The present-day VLSI systems are designed on the basis of binary (radix-2) arithmetic algorithms combined with binary logic devices. As the VLSI technology scales down to deep sub-micron geometry, performance bottlenecks caused by increased wiring complexity and delay are becoming significantly severe. This research project is to investigate a possibility of overcoming the performance bottlenecks by employing a new computing paradigm called "Beyond-Binary Computing". Listed below are major results of this project: 1. High-speed arithmetic algorithms using non-binary redundant number systems were developed and their performances were confirmed through experimental chip fabrications. Examples include (i) a radix-4 parallel divider chip, (ii) a radix-2-4-8 CORDIC processor chip, (iii) a configurable datapath chip using SW arithmetic, and (iv) a real/complex reconfigurable datapath chip using redundant complex arithmetic. Optimizing number representation for target applications makes possible drastic reduction in computation time, power consumption and wiring complexity. Impacts of multiple-valued logic IC technology combined with redundant arithmetic algorithms were demonstrated through the design of field-programmable digital filter ICs. Also, new CAD techniques for designing beyond-binary circuits and systems were proposed. 2. A prototype of set-valued logic system, which uses pseudo-random sequences as information carriers, was designed and fabricated. The underlying principle of the fabricated system was extended to intra-chip CDMA communication techniques, which will be useful for implementing highly parallel computing architectures with reduced wiring complexity. 3. Techniques for computer-based simulation and analysis for enzyme transistor circuits were developed. These techniques were used to demonstrate some applications of molecular computing, including optimal path planning and image processing. The principle of wire-free circuit integration using artificial catalyst devices, such as enzyme transistors, was confirmed experimentally.

  27. Development of Configurable Signal Processors Using Redundant Arithmetic Algorithms

    HIGUCHI Tatsuo, AOKI Takafumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    1999 - 2001

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    Application specific ICs (ASICs) play an important role in present-day DSP technology. However, the ASIC technology requires significant time and cost for development, and is lacking the flexibility in design modification. The FPGA (Field-Programmable Gate Array) technology, on the other hand, attracts much attention recently due to its rapid prototyping capability, but it is difficult to apply FPGAs to high-performance systems. This research project is to develop configurable signal processors --- DSP-oriented FPGA architectures employing redundant arithmetic alogorithms for achieving both high-performance and programmabiligy. Listed below are major results of this project: 1. A configurable signal processor IC, that can implement high-frequency FIR filters with 10--100 MHz sampling rate, was developed. The test chip integrates redundant SW adders and can implement FIR filters of order up to 11. Assuming the use of state-of-the-art CMOS technology, the proposed architecture could be applied to QAM modulators/demodulators and format converters for digital TV applications, for example. 2. A configurable signal processor IC (for FIR filtering) using current-mode multiple-valued logic technology was developed, where 5-level bi-directional current signals are used for intra-chip communication. The use of multiple-valued logic makes possible to reduce the chip area by 50% and power consumption by 4-40%. 3. Various redundant arithmetic algorithms for DSP applications are systematically investigated. Also, new CAD techniques were developed for designing/verifying/synthesizing signal processors using redundant arithmetic algorithms. 4. A new fault-tolerant FPGA architecture that can detect hardware faults and reconfigure its architecture to recover the correct function was proposed for use in mission-critical applications.

  28. Set-Valued-Logic VLSI Architecture for Highly Parallel Computation

    AOKI Takafumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    1998 - 2000

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    Interconnection problems have been recognized as basic limitations in present-day VLSI systems. This research project is to investigate a possibility of solving the interconnection problems by employing new VLSI architectures based on multiple-valued logic (MVL) and set-valued logic (SVL). Listed below are major results of this project : 1. The basic SVL gates employing binary m-sequences as information carriers were proposed. A systematic technique for synthesizing S VL circuits with the basic logic gates was investigated. 2. A highly reliable SVL system employing distributed signal representation with binary m-sequences was proposed. 3. A method of implementing SVL circuits using bi-directional current-mode CMOS technology was proposed. A 9x9-pixel template matching circuit for image processing was fabricated with 0.6um CMOS technology. It was shown that 30% reduction in chip area and 78% reduction in wire area could be achieved by SVL technology for 40x40-pixel template matching. 4. A new type of highly parallel neural network architecture employing m-sequences as signal carriers was proposed. 5. The concept of SVL was extended into a general framework of intra/inter-chip CDMA communication using orthogonal information carriers. A phase-offset-error-free CDMA technique based on multiple-valued m-sequences was investigated for efficient data transmission in VLSI systems. 6. Various hardware algorithms and VLSI architectures based on MVL were also investigated to compare fundamental properties of MVL and SVL.Our initial observation shows that SVL (or CDMA) is suitable for analog signal transmission/processing as well as large-scale inter-chip communication, while MVL is suitable for digital arithmetic computation with lower processing granularity. Further investigations on MVL/SVL-based VLSI architectures for large-scale applications are being left as future research subjects.

  29. Development of a Real-Time Reconfigurable Signal Processor for Image Recognition

    AOKI Takafumi, KOBAYASHI Koji

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: TOHOKU UNIVERSITY

    1997 - 1999

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    Recently, we have proposed a DSP-oriented image recognition algorithm based on Phase-Only Correlation (POC). For applying the proposed algorithm to practical image recognition tasks, high-speed computation of real/complex-mixed data is essential. In this research project, we investigated a signal processor architecture for POC-based image recognition. Non-binary data representations, such as redundant complex number systems and high-radix redundant number systems, are employed to perform fast real/complex-mixed computation. We have developed the key components for the signal processor as listed below: 1. A real/complex reconfigurable arithmetic unit, that can change its structure for three different operation modes, has been proposed and fabricated in 0.5um CMOS. The three modes realize complex-number multiplication, double-length real-number multiplication, and real-number multiply-add operation. The reconfiguration overhead is significantly low, which corresponds to only 8.9% increase of transistor count. 2. A redundant complex multiplier has been proposed and fabricated in 0.5um CMOS. The chip area, interconnect delay and power consumption are reduced to 33.7%, 16.9% and 18.4%, respectively, compared with a complex-number multiplier designed by a standard logic synthesis tool. 3. A configurable multiply-adder based on SW (Signed-Weight) arithmetic has been proposed and fabricated in 0.35um CMOS. The fabricated chip can perform FIR filtering with high sampling-rate around 10MHz-100MHz. 4. A parallel divider and a CORDIC vector rotator for 3D image processing have been proposed and fabricated. The use of high-radix redundant number systems makes possible low-latency implementations of iterative arithmetic operations. In addition to the above results, various applications of POC-based image recognition have been investigated. We developed a 3D (stereo) vision system using hierarchical phase-only matching, and clarified architectural requirements toward the implementation of a new signal processor for 3D measurement and object recognition.

  30. A Study of Highly Parallel Computing Based on Set-Valued Logic

    HIGUCHI Tatsuo, YUMINAKA Yasushi, AOKI Takafumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    1996 - 1998

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    In this project, we investigated a potential of "multiplex computing architectures" (listed below) to address interconnection problems in advanced VLSI systems. 1. [Multiple-Valued Logic System] New arithmetic computing architectures using non-binary/high-radix number systems, such as high-radix dividers, a high-radix CORDIC processor, a redundant complex multiplier and reconfigurable arithmetic datapaths, were developed to demonstrate advantages of improving processing latency, circuit complexity, gate count and power consumption. Also, the impact of multiple-valued integrated circuit technology was investigated through experimental fabrication. 2. [FDMA/CDMA-Based Computing Architectures] Set-valued logic architectures based on FDMA (Frequency-Division Multiple Access) and CDMA (Code-Division Multiple Access) were investigated. A test chip for ODMA-based set-valued logic was fabricated using current-mode CMOS to demonstrate significant reduction in wiring complexity. Also, flexible control of bit error rate in intra-chip data transmission is possible by controlling the length of M-sequence codes and the degree of multiplexing. This idea was also extended to the design of wire-efficient neural network architectures. 3. [Multiwavelength Optical Interconnection] A multiwavelength optical interconnection network for MCM-based parallel processing was proposed and its key device the "wavelength detector" was developed. It was shown that the wavelength detector can discriminate 8 16 wavelengths multiplexed within a waveguide and that this degree of multiplexing makes possible the reduction of network area complexity by the factor of 1/64 - 1/256 in comparison with a single wavelength implementation. 4. [Molecular Computing System] A molecular computing architecture using "enzyme transistors" was investigated. The basic function of an enzyme transistor was confirmed experimentally.

  31. Development of an Integrated Multiwavelength Optical Computing System

    HIGUCHI Tatsuo, AOKI Takafumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    1996 - 1998

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    In this project, we investigated the potential of an integrated multiwavelength optical computing system - a parallel computing system that employs optical wavelength components as multiplexable information carriers. We also developed an "adaptive wavelength selector" as a key component for multiwavelength optical computing. 1. The adaptive wavelength selector consists of a wavelength detector array and an adaptive computing circuit. We fabricated two different types of wavelength detector arrays employing (1) four distinct dielectric multilayer thin-film filters (integrated on a photodiode array) whose pass-bands are adjusted around 635nm, 690nm, 750nm and 830nm, respectively, and (2) a single wedge-shaped dielectric multilayer thin-film filter which is deposited on a photodiode array and is capable of separating multiple wavelength components ranging from 630nm to 850nm simultaneously. We confirmed that the type (2) array is more suitable for integrated multiwavelength optical computing, since it can be fabricated easily by a single stage of patterning and can discriminate 8 - 16 wavelength components using adaptive computing circuitry. 2. The impact of integrated multiwavelength optics on the design of highly parallel interconnection net-works was investigated. We proposed a multiwavelength optical hypercube and showed that the use of 8 - 16 wavelengths makes possible the reduction of network area complexity by the factor of 1/64 - 1/256 in comparison with a single wavelength implementation. We also proposed free-space multiwavelength optical interconnection architectures for point-to-point and broadcast communications, a multiwavelength optical computing system using set-valued logic, and an interconnection-free optical neural network. Also, these ideas are generalized to obtain a paradigm of "multiplex computing" using modulated electric signals for constructing wire-efficient VLSI computing architectures.

  32. 酵素トランジスタに関する基礎研究

    青木 孝文

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 萌芽的研究

    Category: 萌芽的研究

    Institution: 東北大学

    1996 - 1997

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    酵素トランジスタは,エフェクターによりその活性が制御される酵素の機能をモデルにした素子である.電気化学的手法に基づく酵素トランジスタは,エフェクター分子を検出する「ディテクタ」部とその結果に応じてある特定の酵素の活性を制御する「モジュレータ」部により構成される. 1.モジュレータ電極を電気化学的に実現した.具体的な酵素反応系としては,グルコースデヒドロゲナーゼ(酵素)とNAD(補酵素),ヒドロキノン(電子の授受を媒介するメディエータ)の系を用い,これを白金電極反応とカップルさせることにより,酵素活性の電気的制御系を実現した.本システムは,分子情報担体としてグルコース(基質)を想定した場合のモジュレータ電極として機能することが実験的に確認された.すなわち,白金電極に与える電位によって電子伝達効率が変調され,等価的にグルコースデヒドロゲナーゼ酵素反応全体の速度が変動することが確認された.ディテクタ電極として,グルコースオキシターゼ酵素電極を用い,溶液中のグルコース濃度をモニターしたところ,白金電極電位によるグルコース濃度の変調が観測された.これにより,原理的には酵素トランジスタの機能が実現可能であることが判明した. 2.前年度までに,均一系(溶液中の濃度分布に偏りのない系)で動作する酵素トランジスタ回路の解析および設計手法が確立されたが,この結果をもとに拡散過程を含む不均一な反応拡散場における酵素トランジスタのシミュレーション実験を行った.その結果,基質濃度の時空間パターンの形成・発展などの興味深い現象が発見され,これによる新しい信号処理の可能性が見いだされた.今後,酵素トランジスタによる反応拡散コンピューティングに関する新しい研究の展開が期待できる見通しを得た.

  33. 次世代集積化バイオコンピューティングのための酵素スイッチ素子に関する研究

    青木 孝文

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1995 - 1995

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    本研究では,無配線コンピューティングのための酵素スイッチ素子に関する基礎実験ならびに性能評価を行った. 1.酵素スイッチ素子は,液層中の特定の分子を「受信電極」で検出し,その結果に応じて「送信電極」上の酵素活性を制御し,特定の基質を対応する速度で生成物に変換する.まず,通常のイオン電極程度のマクロな大きさで,送信電極を実現した.これを実現する系として,グルコースデヒドロゲナーゼ,NAD,ヒドロキノンの系を取り上げ,酵素反応を有る程度電気化学的に制御できることを確認した.さらに,この系が十分な安定性および選択性を有することを実験的に確認した。 2.グルコースオキシターゼの酵素反応系を利用して受信電極を構成し,これを上記1で実現した送信電極とともに用いることにより,電極間での分子情報の直接伝達に成功した.ただし,この実験系の場合,電極と酵素の間の電子伝達を媒介すうために遊離したメディエータを用いるため,多種類の送信電極を用いる場合に信号のクロストークが問題になることが明らかになった.このため遊離したメディエータを使用しない送信電極の実現が,今後の研究課題として重要になること判明した. 3.また,酵素スイッチ素子を微細化した場合の動作を計算機上でシミュレートし,10μm程度に微細化された酵素スイッチ素子の応答時間が100μsec程度であることを明らかにした.さらに,多数の酵素スイッチ素子を集積化したシステムについてシミュレーションを行い,完全並列画像処理などのさまざまな情報処理が可能であることを新たに見い出した.今後,このような酵素スイッチ素子による配線に制限されない並列情報処理機構のモデルを構築することが必要であると考えられる.

  34. Development of Wavelength Detector ICs for Integrated Optical Multiplex Computing

    AOKI Takafumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Developmental Scientific Research (B)

    Category: Grant-in-Aid for Developmental Scientific Research (B)

    Institution: Tohoku University

    1994 - 1995

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    In this project, compact wavelength detectors for multiwavelength opto-electronic integrated circuits (multiwave OEICs) were developed. Performances of the proposed devices were evaluated to analyze the impact of wavelenght multiplexing for reducing communication subsystem complexity in parallel computing architectures. 1. A compact wavelength detector using a dielectric multilayr thin-film (DMF) filter deposited on a silicon pn photodiode was designed and fabricated. DMF filter areas were successfully defined on a silicon substrate by employing lift-off technique using an evaporated Al film as a lift-off stencil. Finally, a one-chip wavelength detector array was implemented, demonstrating successful discrimination of four wavelength components within 635-830nm range. 2. Fabrication of the proposed device structures will become increasingly difficult as the number of wavelengths in creases. To solve this problem, a new type of wavelength detector array employing a single DMF filter was proposed, and its performance was evaluated through computer simulation. 3. The physical limit on the number of wavelength components that can be used in multiwave OEICs was examined. For example, assuming the width of waveguides, the thickness of DMF filters and the total gain bandwidth of lasers to be 20mum, 8mum and 100nm, respectively, it is estimated that eight wavelength components are available in the system. This number offers the potential for reducing area complexity of hypercube-based interconnection networks by the factor of 1/64 on an average. This demonstrates the impact of wavelength multiplexing for reducing communication subsystem complexity in future computers.

  35. Development of Highly Parallel Optical Multiplex Computing Systems

    HIGUCHI Tatsuo, AOKI Takafumi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Developmental Scientific Research (B)

    Category: Grant-in-Aid for Developmental Scientific Research (B)

    Institution: Tohoku University

    1993 - 1995

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    In this project, we have investigated the potential of optical multiplex computing systems-parallel computing systems that employ optical wavelength components as multiplexable information carries-for overcoming interconnection problems in highly parallel computing architectures. 1.A systematic method for designing optical multiplex computing systems using set-valued logic gates was established. On the basis of the above result, an optical parallel adder using three wavelengths was designed and implemented with discrete opto-electronic components to demonstrate the possibility of wavelength-space parallel processing. 2.The impact of optical multiplex computing on the design of highly parallel interconnection networks was investigated. Optimal packing of interconnection topology into wavelength channels was studied for a wide class of interconnection networks defined by BPC permutations. It was shown that their average interconnection density can be reduced by the factor of 1/gamma using gamma wavelength components. To demonstrate the impact of the proposed method, an 8-input 4-wavelength optical bitonic sorting network was designed and successfully implemented. 3.As a key component for integrated optical multiplex computing, a one-chip wavelength detector employing dielectric multilayr thin-film filters was fabricated, demonstrating successful discrimination of four wavelength components within 635-830nm range. Through experimental study, it was estimated that 8-wavelength multiplexing is possible at the present state of technology. This number offers the potential for reducing area complexity of interconnection networks by the factor of 1/64 on an average.

  36. 無配線バイオコンピューティングのための酵素スイッチ素子に関する研究

    青木 孝文

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1994 - 1994

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    本研究では,無配線コンピューティングのためのバイオ素子に関する基礎実験ならびに性能評価を行った. 1.無配線コンピューティングのためのバイオ素子の機能は、溶液中の特定の基質分子を検出する「選択機能」と,その結果に応じてある特定の酵素反応を活性化させ,新たな生成物分子を溶液中に放出する「出力機能」に分けられる.まず,選択機能に関しては,グルコース酸化酵素,ガラクトース酸化酵素,アルコール酸化酵素を種々の割合で複合固定化したセンサを試作し,これらが十分な選択性と安定性を保有することを明らかにした. 2.一方,出力機能の実現に関しては,酸化還元酵素と電極の間の電子伝達を電気的に制御することにより,等価的に生成物の発生を調節することが考えられる.当初,グルコースを情報担体とし,グルコースオキシターゼおよび白金電極の系を利用して,その濃度の制御を試みる予定であった.しかしながら,グルコースの濃度変化を観測するための受信系が,上記の制御電極の影響を強く受けることが判明した.このため上記の系の代わりにグルコースデヒドロゲナーゼおよびNADによる酵素反応系を用い,これをキノンをメディエータとして白金電極とカップルさせることにより反応制御を実現することを試みた.現在までに,電極電位に応じて酵素反応をONとOFFの2状態にスイッチさせ,グルコース濃度を段階的に変動させることに成功している.今後,本システムの制御性について実験的評価を行う必要があると考えられる. 3.酵素反応過程および拡散過程の両者について計算機シミュレーションを実施し,10μm程度に集積化されたバイオ素子の応答時間が100μsec程度であることを明らかにした.今後は,配線によらないコンピューティングがシステム全体に及ぼす効果を定量的に評価していく必要があると考えられる.

  37. 無配線バイオコンピューティングシステムに関する基礎研究

    青木 孝文

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1993 - 1993

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    本研究では、無配線コンピューティングのためのバイオ素子に関する基礎実験ならびに性能評価を行った。 1.バイオ素子の機能は、溶液中の基質分子を識別する「並列選択機能」と分子情報を放出する「並列出力機能」に分けられる。まず、並列選択機能にかんしては、複数の酵素を表面に固定化した多酵素センサが要求される。本研究では、グルコース酸化酵素、ガラクトース酸化酵素およびアルコール酸化酵素をアルブミンとともに固定化した3酵素センサの試作に成功した。またその過程で、多酵素センサ自体が、溶液中の基質濃度ベクトルに対する重み付き線形加算特性を容易に実現できることが明かになった。今後は、このようなアナログ動作および分子の拡散・反応過程を反映したバイオ素子のモデル化が重要であると思われる。 2.一方、並列出力機能に関しては、電気信号により酵素反応の活性を調節し、目的とする物質の生成を制御することが必要になる。当初、このためには、酵素を固定化した特殊な導電性高分子膜が必要であると考ていた。しかしながら、酵素や過酸化水素などが第2の基質として関与する酵素反応系では、この第2の基質の濃度を通常の電極反応を利用して調節することにより、等価的に酵素反応を制御できることが判明した。このためグルコース酸化酵素を固定可した白金電極の系について、実験システムを構成し、予備実験を完了した。 3.上記の並列選択・出力機能を結合して、バイオ素子を構成した場合の動作を計算機上で模擬し、速度評価を行った。この結果、10mum程度に集積化されたバイオ素子によるリング・オシレータは、約30msの周期で発振することが明らかになった。今後は、配線によらない超並列演算が、全体のアーキテクチャに対してどの程度の効果を有するかということについて、定量的に評価していく必要があると考えられる。

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