Takayuki HAMA


Sensor-Pattern-Noise Map Reconstruction in Source Camera Identification for Size-Reduced Images
Joji WATANABE Tadaaki HOSAKA Takayuki HAMAMOTO 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2013/08/01
Vol. E96-D  No. 8  pp. 1882-1885
Type of Manuscript:  LETTER
Category: Pattern Recognition
Keyword: 
digital forensicssource camera identificationsensor pattern noisesize-reduced imagereconstruction
 Summary | Full Text:PDF

High-Accuracy Motion Estimation by Variable Gradient Method Using High Frame-Rate Images
Hiroshi KATAYAMA Danya SUGAI Takayuki HAMAMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/08/01
Vol. E95-A  No. 8  pp. 1302-1305
Type of Manuscript:  Special Section LETTER (Special Section on Image Media Quality)
Category: Coding & Processing
Keyword: 
motion-estimationsub-pixelgradient-methodsuper-resolution
 Summary | Full Text:PDF

Image Quality Enhancement for Single-Image Super Resolution Based on Local Similarities and Support Vector Regression
Atsushi YAGUCHI Tadaaki HOSAKA Takayuki HAMAMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/02/01
Vol. E94-A  No. 2  pp. 552-554
Type of Manuscript:  Special Section LETTER (Special Section on Image Media Quality)
Category: Processing
Keyword: 
super resolutionlocal similaritysupport vector regression (SVR)total variation (TV)
 Summary | Full Text:PDF

A Dynamic Offset Control Technique for Comparator Design in Scaled CMOS Technology
Xiaolei ZHU Yanfei CHEN Masaya KIBUNE Yasumoto TOMITA Takayuki HAMADA Hirotaka TAMURA Sanroku TSUKAMOTO Tadahiro KURODA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/12/01
Vol. E93-A  No. 12  pp. 2456-2462
Type of Manuscript:  Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Device and Circuit Modeling and Analysis
Keyword: 
comparatorA/D converteroffset controlCMOS
 Summary | Full Text:PDF

Split Capacitor DAC Mismatch Calibration in Successive Approximation ADC
Yanfei CHEN Xiaolei ZHU Hirotaka TAMURA Masaya KIBUNE Yasumoto TOMITA Takayuki HAMADA Masato YOSHIOKA Kiyoshi ISHIKAWA Takeshi TAKAYAMA Junji OGAWA Sanroku TSUKAMOTO Tadahiro KURODA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/03/01
Vol. E93-C  No. 3  pp. 295-302
Type of Manuscript:  Special Section PAPER (Special Section on Circuits and Design Techniques for Advanced Large Scale Integration)
Category: 
Keyword: 
ADCsuccessive approximationsplit capacitor DACcomparatorcalibration
 Summary | Full Text:PDF

Objective Evaluation of Components of Colour Distortions due to Image Compression
Amal PUNCHIHEWA Jonathan ARMSTRONG Seiichiro HANGAI Takayuki HAMAMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/12/01
Vol. E92-A  No. 12  pp. 3307-3312
Type of Manuscript:  Special Section PAPER (Special Section on Image Media Quality)
Category: Evaluation
Keyword: 
colour blurcolour ringingimage compressioncolour distortionsobjective evaluation
 Summary | Full Text:PDF

Wide Dynamic Range Image Sensor with Polygonal-Line I/O Characteristic Adapted to Brightness Distribution of Objects
Satoko KAGAMI Fumitsugu SUZUKI Takayuki HAMAMOTO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2008/09/01
Vol. E91-C  No. 9  pp. 1402-1408
Type of Manuscript:  Special Section PAPER (Special Section on Advanced Processors Based on Novel Concepts in Computation)
Category: 
Keyword: 
smart image sensorwide dynamic range imagingdynamic range compressionvariable integration timecontrast enhancement
 Summary | Full Text:PDF

Wide View Imaging System Using Eight Random Access Image Sensors
Kenji IDE Ryusuke KAWAHARA Satoshi SHIMIZU Takayuki HAMAMOTO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/10/01
Vol. E90-C  No. 10  pp. 1884-1891
Type of Manuscript:  Special Section PAPER (Special Section on VLSI Technology toward Frontiers of New Market)
Category: Image Sensor/Vision Chip
Keyword: 
smart image sensorwide view imagingobject trackingFPGAbackground subtraction
 Summary | Full Text:PDF

TCP-Westwood Low-Priority for Overlay QoS Mechanism
Hideyuki SHIMONISHI Takayuki HAMA M.Y. SANADIDI Mario GERLA Tutomu MURASE 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/09/01
Vol. E89-B  No. 9  pp. 2414-2423
Type of Manuscript:  Special Section PAPER (Special Section on Networking Technologies for Overlay Networks)
Category: 
Keyword: 
overlayQoSpriorityTCPTCP-westwood
 Summary | Full Text:PDF

Image Acquisition by Pixel-Based Random-Access Image Sensor for a Real-Time IBR System
Ryutaro OI Takayuki HAMAMOTO Kiyoharu AIZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2002/03/01
Vol. E85-C  No. 3  pp. 505-510
Type of Manuscript:  Special Section PAPER (Special Issue on Signals, Systems and Electronics Technology)
Category: Signal Processing
Keyword: 
image based renderingCMOS image sensorlight-field renderingsmart sensorcamera array
 Summary | Full Text:PDF

A New Image Sensor with Space Variant Sampling Control on a Focal Plane
Yasuhiro OHTSUKA Takayuki HAMAMOTO Kiyoharu AIZAWA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2000/07/25
Vol. E83-D  No. 7  pp. 1331-1337
Type of Manuscript:  Special Section PAPER (Special Issue on Machine Vision Applications)
Category: 
Keyword: 
spatially variant samplingsampling position memoryimage sensorsmart scanning
 Summary | Full Text:PDF