A Study for High Performance Character Extraction from Color Scene Images. - Keiichiro Shirai; Masanori Wakabayashi; Masayuki Okamoto; Hiroaki Yamamoto (Document Analysis Systems, 2008)

Embedding a Mathematical OCR Module into OCRopus. - Shinpei Yamazaki; Fumihiro Furukori; Qinzheng Zhao; Keiichiro Shirai; Masayuki Okamoto (ICDAR, 2011)

Noiseless no-flash photo creation by color transform of flash image. - Keiichiro Shirai; Masayuki Okamoto; Masaaki Ikehara (ICIP, 2011)

Local Covariance Filtering for Color Images. - Keiichiro Shirai; Masahiro Okuda; Takao Jinno; Masayuki Okamoto; Masaaki Ikehara (ACCV (4), 2012)

Flicker and black-streak artifact removal from images of display monitors taken by video cameras. - Kotaro Nakazawa; Keiichiro Shirai; Masayuki Okamoto; Toshio Koga (APSIPA, 2012)

Directional image decomposition using retargeting pyramid. - Yuichi Tanaka 001; Keiichiro Shirai (APSIPA, 2012)

Removal of Background Patterns and Signatures for Magnetic Ink Character Recognition of Checks. - Keiichiro Shirai; Masashi Akita; Masayuki Okamoto; Kazuya Tanikawa; Takaaki Akiyama; Tetsuji Sakaguchi (Document Analysis Systems, 2012)

Color-line vector field and local color component decomposition for smoothing and denoising of color images. - Keiichiro Shirai; Masahiro Okuda; Masaaki Ikehara (ICPR, 2012)

High dynamic range image acquisition using flash image. - Ryo Matsuoka; Tatsuya Baba; Masahiro Okuda; Keiichiro Shirai (ICASSP, 2013)

Scalable image representation using improved retargeting pyramid. - Yuichi Tanaka 001; Keiichiro Shirai (ICASSP, 2013)

An OCR System with OCRopus for Scientific Documents Containing Mathematical Formulas. - Fumihiro Furukori; Shinpei Yamazaki; T. Miyagishi; Keiichiro Shirai; Masayuki Okamoto (ICDAR, 2013)

O(1) transposed bilateral filtering for optimization. - Kenjiro Sugimoto; Keiichiro Shirai; Sei-ichiro Kamata (APSIPA, 2014)

Flash/no-flash image integration using convex optimization. - Tatsuya Baba; Ryo Matsuoka; Shunsuke Ono; Keiichiro Shirai; Masahiro Okuda (ICASSP, 2014)

Lossless/near-lossless color image coding by inverse demosaicing. - Ryo Kuroiwa 003; Ryo Matsuoka; Seisuke Kyochi; Keiichiro Shirai; Masahiro Okuda (ICASSP, 2014)

Retargeting pyramid using direct decimation. - Ryosuke Morita; Keiichiro Shirai; Yuichi Tanaka 001 (ICASSP, 2014)

FFT based solution for multivariable L2 equations using KKT system via FFT and efficient pixel-wise inverse calculation. - Keiichiro Shirai; Masahiro Okuda (ICASSP, 2014)

Color transform between image pair using covariance correspondences of local color distributions. - Yusuke Tatesumi; Keisuke Iwata; Keiichiro Shirai; Masahiro Okuda (ICASSP, 2014)

Data tracking and effect of frequency offset to simultaneous collecting method for wireless sensor networks. - Ryo Myoenzono; Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Sliiro Handa (ICTC, 2014)

An automatic yearbook style photo generation method using color grading and guide image filtering based facial skin color correction. - Tatsuya Baba; Masahiro Okuda; Paul Perrotin; Yusuke Tatesumi; Keiichiro Shirai (ACPR, 2015)

Performance analysis of retargeting pyramid and its applications. - Ryosuke Morita; Keiichiro Shirai; Yuichi Tanaka 001 (ICIP, 2015)

Non-local/local image filters using fast eigenvalue filtering. - Masaki Onuki; Shunsuke Ono; Keiichiro Shirai; Yuichi Tanaka 001 (ICIP, 2015)

A regularization approach for bayer reconstruction in lossy image coding by inverse demosaicing. - Masao Yamagishi; Seisuke Kyochi; Keiichiro Shirai; Masahiro Okuda (ICIP, 2015)

Data Tracking and Effect of Frequency Offset to Simultaneous Collecting Method for Wireless Sensor Networks. - Ryo Myoenzono; Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Shiro Handa (Int. J. Distributed Sens. Networks, 2015)

Fundamental study of decomposition based on heterogeneous sensing data in physical conversion sensor networks. - Minato Oriuchi; Osamu Takyu; Keiichiro Shirai; Fumihito Sasamori; Shiro Handa; Mai Ohta; Takeo Fujii (APSIPA, 2016)

Vectorial total variation based on arranged structure tensor for multichannel image restoration. - Shunsuke Ono; Keiichiro Shirai; Masahiro Okuda (ICASSP, 2016)

Image colorization based on ADMM with fast singular value thresholding by Chebyshev polynomial approximation. - Masaki Onuki; Shunsuke Ono; Keiichiro Shirai; Yuichi Tanaka 001 (ICASSP, 2016)

Multi-target tracking based on features of sensing results and wireless parameters for physical wireless parameter conversion sensor networks. - Minato Oriuchi; Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Shiro Handa (RWS, 2016)

Performance evaluation of multi-target tracking for PhyC-SN. - Minato Oriuchi; Osamu Takyu; Keiichiro Shirai; Fumihito Sasamori; Shiro Handa; Takeo Fujii; Mai Ohta (WCNC Workshops, 2016)

Fast Supervised Discrete Hashing and its Analysis. - Gou Koutaki; Keiichiro Shirai; Mitsuru Ambai (CoRR, 2016)

Misaligned Image Integration With Local Linear Model. - Tatsuya Baba; Ryo Matsuoka; Keiichiro Shirai; Masahiro Okuda (IEEE Trans. Image Process., 2016)

Local Spectral Component Decomposition for Multi-Channel Image Denoising. - Mia Rizkinia; Tatsuya Baba; Keiichiro Shirai; Masahiro Okuda (IEEE Trans. Image Process., 2016)

Hyperspectral image restoration based on spatio-spectral structure tensor regularization. - Ryuji Kurihara; Shunsuke Ono; Keiichiro Shirai; Masahiro Okuda (EUSIPCO, 2017)

Frequency spectrum regularization for pattern noise removal based on image decomposition. - Keiichiro Shirai; Shunsuke Ono; Masahiro Okuda (EUSIPCO, 2017)

Interactive Image Search System Based on Multimodal Analogy. - Kosuke Ota; Keiichiro Shirai; Hidetoshi Miyao; Minoru Maruyama (HCI (30), 2017)

Principal noiseless color component extraction by linear color composition with optimal coefficients. - Takuya Sugimoto; Kazuhiro Fujimori; Keiichiro Shirai; Hidetoshi Miyao; Minoru Maruyama (ICIP, 2017)

Data Tracking Using Frequency Offset and SIC for Physical Wireless Conversion Sensor Networks. - Takehiro Sakai; Osamu Takyu; Keiichiro Shirai; Mai Ohta; Takeo Fujii; Fumihito Sasamori; Shiro Handa (WCNC Workshops, 2017)

Measurement Technique for Occupancy Ratio and Transition Ratio in Cognitive Radio System. - Hayato Soya; Osamu Takyu; Keiichiro Shirai; Mai Ohta; Takeo Fujii; Fumihito Sasamori; Shiro Handa (WCNC Workshops, 2017)

Fast Singular Value Shrinkage With Chebyshev Polynomial Approximation Based on Signal Sparsity. - Masaki Onuki; Shunsuke Ono; Keiichiro Shirai; Yuichi Tanaka 001 (IEEE Trans. Signal Process., 2017)

Data Separation Technique using Spatial Correlation of Sensing Results for Physical Wireless Parameter Conversion Sensor Networks. - Naoya Amano; Osamu Takyu; Keiichiro Shirai; Fumihito Sasamori; Shiro Handa (APSIPA, 2018)

A Signal Separation Method for Physical Wireless Parameter Conversion Sensor Networks Using K-Shortest Path. - Shuhei Yamasaki; Minato Oriuchi; Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Shiro Handa (APSIPA, 2018)

Color Affine Subspace Pursuit for Color Artifact Removal. - Kazuki Yamanaka; Seisuke Kyochi; Shunsuke Ono; Keiichiro Shirai (ICASSP, 2018)

Hadamard Coded Discrete Cross Modal Hashing. - Koichi Eto; Gou Koutaki; Keiichiro Shirai (ICIP, 2018)

Modified rendezvous scheme with inferring access channel probability of slave by master. - Hayato Soya; Osamu Takyu; Keiichiro Shirai; Fumihito Sasamori; Shiro Handa; Mai Ohta; Takeo Fujii (ICOIN, 2018)

A Study on Pixel-wise Parallel Calculation for Depth from Focus Using Gray Level Variance. - Yoichi Matsubara; Yuya Ito; Keiichiro Shirai; Kiyoshi Tanaka (ISPACS, 2018)

Transmit control and data separation in physical wireless parameter conversion sensor networks with event driven sensors. - Kyosuke Fukuda; Osamu Takyu; Keiichiro Shirai; Mai Ohta; Takeo Fujii; Fumihito Sasamori; Shiro Handa (WiSNet, 2018)

Fast Rendezvous Scheme with a Few Control Signals for Multi-Channel Cognitive Radio. - Hayato Soya; Osamu Takyu; Keiichiro Shirai; Mai Ohta; Takeo Fujii; Fumihito Sasamori; Shiro Handa (IEICE Trans. Commun., 2018)

Hadamard Coding for Supervised Discrete Hashing. - Gou Koutaki; Keiichiro Shirai; Mitsuru Ambai (IEEE Trans. Image Process., 2018)

Data Separation Considering Smoothness of Sensing Data in Physical Wireless Parameter Conversion Sensor Networks. - Shuhei Yamasaki; Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Shiro Handa (ICOIN, 2019)

ISHIGAKI Retrieval through Combinatorial Optimization. - Sakino Ando; Gou Koutaki; Keiichiro Shirai (SUMAC @ ACM Multimedia, 2019)

Adaptive Transmission Control with Prediction of Sensing Results for PhyC-SN. - Kyosuke Fukuda; Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Sliiro Handa (RWS, 2019)

Adaptive Channel Assignment With Predictions of Sensor Results and Channel Occupancy Ratio in PhyC-SN. - Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta (IEEE Access, 2019)

ID Insertion and Data Tracking with Frequency Offset for Physical Wireless Parameter Conversion Sensor Networks. - Osamu Takyu; Keiichiro Shirai; Mai Ohta; Takeo Fujii (Sensors, 2019)

Reference-based local color distribution transformation method and its application to image integration. - Ryo Matsuoka; Keiichiro Shirai; Masahiro Okuda (Signal Process. Image Commun., 2019)

Multiplexing Display using Vector Error Propagation and Smooth Active Shutter. - Gou Koutaki; Keiichiro Shirai (SIGGRAPH Emerging Technologies, 2020)

Efficient Pixel-Wise SVD Required for Image Processing Using the Color Line Feature. - Keiichiro Shirai; Yuya Ito; Hidetoshi Miyao; Minoru Maruyama (IEEE Access, 2021)

Guided Facial Skin Color Correction. - Keiichiro Shirai; Tatsuya Baba; Shunsuke Ono; Masahiro Okuda; Yusuke Tatesumi; Paul Perrotin (CoRR, 2021)

Optimal Construction of Access Rate to Superior Channel in Rendezvous Channel Based on Channel-Occupancy Ratio. - Yuki Nishio; Osamu Takyu; Hayato Soya; Keiichiro Shirai; Mai Ohta; Takeo Fujii (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021)

Spatial Compression of Sensing Information for Exploiting the Vacant Frequency Resource Using Radio Sensors. - Kenichiro Yamamoto; Osamu Takyu; Keiichiro Shirai; Yasushi Fuwa (IEICE Trans. Commun., 2021)

ISHIGAKI Retrieval System Using 3D Shape Matching and Combinatorial Optimization. - Gou Koutaki; Sakino Ando; Keiichiro Shirai; Tsuyoshi Kishigami (Int. J. Comput. Vis., 2022)

Multimodal Analogy-Based Image Retrieval by Improving Semantic Embeddings. - Kosuke Ota; Keiichiro Shirai; Hidetoshi Miyao; Minoru Maruyama (J. Adv. Comput. Intell. Intell. Informatics, 2022)

Pixel-wise parallel calculation for depth from focus with adaptive focus measure. - Yoichi Matsubara; Keiichiro Shirai; Yuya Ito; Kiyoshi Tanaka (Multidimens. Syst. Signal Process., 2022)