Detection of water amount on the surface of glass fibers using the transient leakage current of static electricity. - Keiichiro Kagawa; Yutaka Sugino; Katsuhiko Kagami; Masahiro Ueda (IEEE Trans. Instrum. Meas., 1999)

Architecture Description and Prototype Demonstration of Optoelectronic Parallel-Matching Architecture. - Keiichiro Kagawa; Kouichi Nitta; Yusuke Ogura; Jun Tanida; Yoshiki Ichioka (IPDPS Workshops, 2000)

An image-sensor-based optical receiver fabricated in a standard 0.35-µm CMOS technology for free-space optical communications. - Keiichiro Kagawa; Tomoaki Kawakami; Hiroaki Asazu; Takashi Ikeuchi; Akiko Fujiuchi; Jun Ohta; Masahiro Nunoshita (ASP-DAC, 2004)

A retinal prosthetic device using a pulse-frequency-modulation CMOS image sensor. - Jun Ohta; Tetsuo Furumiya; David C. Ng; Akihiro Uehara; Keiichiro Kagawa; Takashi Tokuda; Masahiro Nunoshita (ASP-DAC, 2004)

Improvement of saturation characteristics of a frequency-demodulation CMOS image sensor. - Jun Ohta; Keiichiro Kagawa; Koichi Yamamoto; Takashi Tokuda; Yu Oya; Masahiro Nunoshita (ASP-DAC, 2004)

A high-sensitive digital photosensor using MOS interface-trap charge pumping. - Akihiro Uehara; Keiichiro Kagawa; Takashi Tokuda; Jun Ohta; Masahiro Nunoshita (IEICE Electron. Express, 2004)

Retinal prosthesis device based on pulse-frequency-modulation vision chip. - Jun Ohta; Keiichiro Kagawa; Takashi Tokuda; Masahiro Nunoshita (ISCAS (3), 2005)

Pulse modulation CMOS image sensor for bio-fluorescence imaging applications. - Jun Ohta; Takahashi Tokuda; Keiichiro Kagawa; Masahiro Nunoshita; Sadao Shiosaka (ISCAS (4), 2005)

A multi-chip-architecture based flexible stimulation device for retinal prosthesis with a flip-chip packaging technique. - Takashi Tokuda; Masayuki Kawada; Sachie Sugitani; Mari Taniyama; Akihiro Uehara; Keiichiro Kagawa; Masahiro Nunoshita; Jun Ohta (EMBC, 2006)

Toward 1000-ch electrode array based on distributed microchip architecture for retinal prosthesis. - Jun Ohta; Takahashi Tokuda; Keiichiro Kagawa; Akihiro Uehara; Yasuo Terasawa; Kenzo Shodo; Takashi Fujikado; Yasuo Tano (ISCAS, 2006)

An optical and potential dual-image CMOS sensor for on-chip neural and DNA imaging applications. - Takahashi Tokuda; David C. Ng; Akio Yamamoto; Keiichiro Kagawa; Masahiro Nunoshita; Jun Ohta (ISCAS, 2006)

Pulse frequency modulation based CMOS image sensor for subretinal stimulation. - David C. Ng; Tetsuo Furumiya; Koichi Yasuoka; Akihiro Uehara; Keiichiro Kagawa; Takashi Tokuda; Masahiro Nunoshita; Jun Ohta (IEEE Trans. Circuits Syst. II Express Briefs, 2006)

A multi-microchip retinal stimulator for in vitro / in vivo experiments. - Jun Ohta; Takahashi Tokuda; Keiichiro Kagawa; Akihiro Uehara; Yasuo Terasawa; Kazuaki Nakauchi; Takashi Fujikado; Yasuo Tano (ISCAS, 2007)

A low-voltage PWM CMOS imager with small pixel size using an in-pixel gate-common comparator. - Keiichiro Kagawa; Sanshiro Shishido; Tatsuya Sasaki; Itsuki Nagahata; Masahiro Nunoshita; Jun Ohta (IEICE Electron. Express, 2007)

Preliminary Demonstration of 1.0 V CMOS Imager with Semi-Pixel-Level ADC Based on Pulse-Width-Modulation Pixel Readout. - Keiichiro Kagawa; Makoto Shouho; Kazuo Hashiguchi; Masahiro Nunoshita; Jun Ohta (IEICE Trans. Electron., 2007)

Demonstration of Wide-angle Beam Steering Optics in Wavelength-division-multiplexing Indoor Optical Wireless LAN with Dedicated CMOS Imager. - Keiichiro Kagawa; Jun Tanida (BIONETICS, 2008)

Ambient Suite: enhancing communication among multiple participants. - Kazuyuki Fujita; Yuichi Itoh; Hiroyuki Ohsaki; Naoaki Ono; Keiichiro Kagawa; Kazuki Takashima; Sho Tsugawa; Kosuke Nakajima; Yusuke Hayashi; Fumio Kishino (Advances in Computer Entertainment Technology, 2011)

Quasi-realtime social network construction with heterogeneous sensors in ambient environment. - Sho Tsugawa; Hiroyuki Ohsaki; Yuichi Itoh; Naoaki Ono; Keiichiro Kagawa; Kazuki Takashima; Makoto Imase (Advances in Computer Entertainment Technology, 2011)

A CMOS imager using focal-plane pinhole effect for confocal multibeam scanning microscopy. - Min-Woong Seo; An Wang; Zhuo Li; Keita Yasutomi; Keiichiro Kagawa; Shoji Kawahito (Sensors, Cameras, and Systems for Industrial and Scientific Applications, 2012)

Variable field-of-view visible and near-infrared polarization compound-eye endoscope. - Keiichiro Kagawa; Rui Shogenji; Eiji Tanaka; Kenji Yamada; Shoji Kawahito; Jun Tanida (EMBC, 2012)

Ambient Suite: Room-shaped information environment for interpersonal communication. - Kazuyuki Fujita; Yuichi Itoh; Hiroyuki Ohsaki; Naoaki Ono; Keiichiro Kagawa; Kazuki Takashima; Sho Tsugawa; Kosuke Nakajima; Yusuke Hayashi; Fumio Kishino (VR, 2012)

Toward large-scale and dynamic social network analysis with heterogeneous sensors in ambient environment. - Sho Tsugawa; Hiroyuki Ohsaki; Yuichi Itoh; Naoaki Ono; Keiichiro Kagawa; Kazuki Takashima; Makoto Imase (VR, 2012)

A distributed ramp signal generator of column-parallel single-slope ADCs for CMOS image sensors. - Kaita Imai; Keita Yasutomi; Keiichiro Kagawa; Shoji Kawahito (IEICE Electron. Express, 2012)

A custom CMOS imager for multi-beam laser scanning microscopy and an improvement of scanning speed. - Min-Woong Seo; Keiichiro Kagawa; Keita Yasutomi; Shoji Kawahito (Sensors, Cameras, and Systems for Industrial and Scientific Applications, 2013)

RTS noise reduction of CMOS image sensors using amplifier-selection pixels. - Mohd Amrallah Mustafa; Min-Woong Seo; Shoji Kawahito; Keita Yasutomi; Keiichiro Kagawa (IEICE Electron. Express, 2013)

Design of a Digitally Error-Corrected Pipeline ADC Using Incomplete Settling of Pre-Charged Residue Amplifiers. - Sung-Wook Jun; Lianghua Miao; Keita Yasutomi; Keiichiro Kagawa; Shoji Kawahito (IEICE Trans. Electron., 2013)

Realization of Secure Ambient Wireless Network System Based on Spatially Distributed Ciphering Function. - Masashi Okada; Masahide Hatanaka; Keiichiro Kagawa; Shinichi Miyamoto (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013)

A CMOS time-of-flight range image sensor using draining only modulation structure. - Sang-Man Han; Keita Yasutomi; Keiichiro Kagawa; Shoji Kawahito (IMSE, 2014)

A stimulated Raman scattering imager using high-speed lateral electric field modulator and lock-in pixels amplifiers. - Kamel Mars; Beak Guseul; Sang-Man Han; Taishi Takasawa; Keita Yasutomi; Keiichiro Kagawa; Mamoru Hashimoto; Shoji Kawahito (IMSE, 2014)

A high fill-factor low dark leakage CMOS image sensor with shared-pixel design. - Min-Woong Seo; Keita Yasutomi; Keiichiro Kagawa; Shoji Kawahito (IMSE, 2014)

An indirect time-of-flight measurement technique for sub-mm range resolution using impulse photocurrent response. - Takahiro Usui; Keita Yasutomi; Sang-Man Han; Taishi Takasawa; Keiichiro Kagawa; Shoji Kawahito (IMSE, 2014)

A time-resolved image sensor for tubeless streak cameras. - Keita Yasutomi; Sang-Man Han; Min-Woong Seo; Taishi Takasawa; Keiichiro Kagawa; Shoji Kawahito (IMSE, 2014)

7.4 A 413×240-pixel sub-centimeter resolution Time-of-Flight CMOS image sensor with in-pixel background canceling using lateral-electric-field charge modulators. - Sang-Man Han; Taishi Takasawa; Tomoyuki Akahori; Keita Yasutomi; Keiichiro Kagawa; Shoji Kawahito (ISSCC, 2014)

7.5 A 0.3mm-resolution Time-of-Flight CMOS range imager with column-gating clock-skew calibration. - Keita Yasutomi; Takahiro Usui; Sang-Man Han; Taishi Takasawa; Keiichiro Kagawa; Shoji Kawahito (ISSCC, 2014)

Lock-in pixels readout circuit using a high speed lateral electric field modulator with differential charge accumulation for stimulated Raman scattering imager. - Kamel Mars; Ken Egawa; Xing Lioe De; Sang-Man Han; Taishi Takasawa; Keita Yasutomi; Keiichiro Kagawa; Mamoru Hashimoto; Shoji Kawahito (NEWCAS, 2014)

Image-sensor-based visible light communication for automotive applications. - Takaya Yamazato; Isamu Takai; Hiraku Okada; Toshiaki Fujii; Tomohiro Yendo; Shintaro Arai; Michinori Andoh; Tomohisa Harada; Keita Yasutomi; Keiichiro Kagawa; Shoji Kawahito (IEEE Commun. Mag., 2014)

RTS Noise and Dark Current White Defects Reduction Using Selective Averaging Based on a Multi-Aperture System. - Bo Zhang; Keiichiro Kagawa; Taishi Takasawa; Min-Woong Seo; Keita Yasutomi; Shoji Kawahito (Sensors, 2014)

A high-sensitivity 2x2 multi-aperture color camera based on selective averaging. - Bo Zhang; Keiichiro Kagawa; Taishi Takasawa; Min-Woong Seo; Keita Yasutomi; Shoji Kawahito (IMSE, 2015)

Spectral study of metabolism-based autofluorescence and white-light reflectance for endoscopic tumor imaging. - Masashi Ozaki; Keiichiro Kagawa; Hidenobu Arimoto; Yoko Kominami; Yoji Sanomura; Shigeto Yoshida; Min-Woong Seo; Shoji Kawahito; Shinji Tanaka (EMBC, 2015)

6.4 Single-shot 200Mfps 5×3-aperture compressive CMOS imager. - Futa Mochizuki; Keiichiro Kagawa; Shin-ichiro Okihara; Min-Woong Seo; Bo Zhang; Taishi Takasawa; Keita Yasutomi; Shoji Kawahito (ISSCC, 2015)

11.2 A 10.8ps-time-resolution 256×512 image sensor with 2-Tap true-CDS lock-in pixels for fluorescence lifetime imaging. - Min-Woong Seo; Keiichiro Kagawa; Keita Yasutomi; Taishi Takasawa; Yoshimasa Kawata; Nobukazu Teranishi; Zhuo Li; Izhal Abdul Halin; Shoji Kawahito (ISSCC, 2015)

A high time-resolution two-tap CMOS lock-in pixel image sensor for time-resolved measurements and its applications. - Min-Woong Seo; Yuya Shirakawa; Keiichiro Kagawa; Keita Yasutomi; Yoshimasa Kawata; Nobukazu Teranishi; Shoji Kawahito (BioCAS, 2016)

A Time-of-Flight CMOS Range Image Sensor Using 4-Tap Output Pixels with Lateral-Electric-Field Control. - Taichi Kasigao; Sang-Man Han; Hanh Trang; Taishi Takasawa; Satoshi Aoyama; Keita Yasutomi; Keiichiro Kagawa; Shoji Kawahito (IMSE, 2016)

Design, implementation and evaluation of a TOF range image sensor using multi-tap lock-in pixels with cascaded charge draining and modulating gates. - Hanh Trang; Taichi Kasugai; Keigo Isobe; Sang-Man Han; Taichi Takasawa; Xing Lioe De; Keita Yasutomi; Keiichiro Kagawa; Shoji Kawahito (IMSE, 2016)

Dynamic photometric stereo method using multi-tap CMOS image sensor. - Takuya Yoda; Hajime Nagahara; Rin-Ichiro Taniguchi; Keiichiro Kagawa; Keita Yasutomi; Shoji Kawahito (ICPR, 2016)

A 10 ps Time-Resolution CMOS Image Sensor With Two-Tap True-CDS Lock-In Pixels for Fluorescence Lifetime Imaging. - Min-Woong Seo; Keiichiro Kagawa; Keita Yasutomi; Yoshimasa Kawata; Nobukazu Teranishi; Zhuo Li; Izhal Abdul Halin; Shoji Kawahito (IEEE J. Solid State Circuits, 2016)

A Stimulated Raman Scattering CMOS Pixel Using a High-Speed Charge Modulator and Lock-in Amplifier. - Xing Lioe De; Kamel Mars; Shoji Kawahito; Keita Yasutomi; Keiichiro Kagawa; Takahiro Yamada; Mamoru Hashimoto (Sensors, 2016)

RTS and photon shot noise reduction based on maximum likelihood estimate with multi-aperture optics and semi-photon-counting-level CMOS image sensors. - Haruki Ishida; Keiichiro Kagawa; Min-Woong Seo; Takashi Komuro; Bo Zhang; Taishi Takasawa; Keita Yasutomi; Shoji Kawahito (IMSE, 2017)

A Lateral Electric Field charge Modulator with Bipolar-gates for Time-resolved Imaging. - Yuki Morikawa; Keita Yasutomi; Shoma Imanishi; Taishi Takasawa; Keiichiro Kagawa; Nobukazu Teranishi; Shoji Kawahito (IMSE, 2017)

Two-Band Infrared Video-Based Measurement for Non-Contact Pulse Wave Detection on Face without Visible Lighting. - Ryota Mitsuhashi; Genki Okada; Koki Kurita; Keiichiro Kagawa; Shoji Kawahito; Chawan Koopipat; Norimichi Tsumura (CIC, 2017)

Noncontact heart rate measurement using high sensitivity camera in low light environment. - Genki Okada; Keiichiro Kagawa; Shoji Kawahito; Norimichi Tsumura (CIC, 2017)

4.3 A programmable sub-nanosecond time-gated 4-tap lock-in pixel CMOS image sensor for real-time fluorescence lifetime imaging microscopy. - Min-Woong Seo; Yuya Shirakawa; Yuriko Masuda; Yoshimasa Kawata; Keiichiro Kagawa; Keita Yasutomi; Shoji Kawahito (ISSCC, 2017)

A gaze-preserving group video conference system using screen-embedded cameras. - Kazuki Kobayashi; Takashi Komuro; Bo Zhang; Keiichiro Kagawa; Shoji Kawahito (VRST, 2017)

Label-Free Biomedical Imaging Using High-Speed Lock-In Pixel Sensor for Stimulated Raman Scattering. - Kamel Mars; Xing Lioe De; Shoji Kawahito; Keita Yasutomi; Keiichiro Kagawa; Takahiro Yamada; Mamoru Hashimoto (Sensors, 2017)

A Distance Measurement Method Using A Time-of-Flight CMOS Range Image Sensor with 4-Tap Output Pixels and Multiple Time-Windows. - Kohei Yamada; Komazawa Akihito; Taishi Takasawa; Keita Yasutomi; Keiichiro Kagawa; Shoji Kawahito (IMSE, 2018)

Dual-Band Infrared Video-Based Measurement Using Pulse Wave Maps to Analyze Heart Rate Variability. - Ryota Mitsuhashi; Keiichiro Kagawa; Shoji Kawahito; Chawan Koopipat; Norimichi Tsumura (CIC, 2018)

A Two-Tap NIR Lock-in Pixel CMOS Image Sensor with Background Light Cancelling Capability for Non-Contact Heart Rate Detection. - Chen Cao; Yuya Shirakawa; Leyi Tan; Min-Woong Seo; Keiichiro Kagawa; Keita Yasutomi; Tomohiko Kosugi; Satoshi Aoyama; Nobukazu Teranishi; Norimichi Tsumura; Shoji Kawahito (VLSI Circuits, 2018)

Noncontact pulse wave detection by two-band infrared video-based measurement on face without visible lighting. - Ryota Mitsuhashi; Genki Okada; Koki Kurita; Keiichiro Kagawa; Shoji Kawahito; Chawan Koopipat; Norimichi Tsumura (Artif. Life Robotics, 2018)

A Time-Resolved Four-Tap Lock-In Pixel CMOS Image Sensor for Real-Time Fluorescence Lifetime Imaging Microscopy. - Min-Woong Seo; Yuya Shirakawa; Yoshimasa Kawata; Keiichiro Kagawa; Keita Yasutomi; Shoji Kawahito (IEEE J. Solid State Circuits, 2018)

Multi-Aperture-Based Probabilistic Noise Reduction of Random Telegraph Signal Noise and Photon Shot Noise in Semi-Photon-Counting Complementary-Metal-Oxide-Semiconductor Image Sensor. - Haruki Ishida; Keiichiro Kagawa; Takashi Komuro; Bo Zhang; Min-Woong Seo; Taishi Takasawa; Keita Yasutomi; Shoji Kawahito (Sensors, 2018)

A Silicon-on-Insulator-Based Dual-Gain Charge-Sensitive Pixel Detector for Low-Noise X-ray Imaging for Future Astronomical Satellite Missions. - Sumeet Shrestha; Shoji Kawahito; Hiroki Kamehama; Syunta Nakanishi; Keita Yasutomi; Keiichiro Kagawa; Nobukazu Teranishi; Ayaki Takeda; Takeshi Go Tsuru; Ikuo Kurachi; Yasuo Arai (Sensors, 2018)

Noncontact heart rate measurement using a high-sensitivity camera in a low-light environment. - Genki Okada; Ryota Mitsuhashi; Keiichiro Kagawa; Shoji Kawahito; Norimichi Tsumura (Artif. Life Robotics, 2019)

A Time-Resolved NIR Lock-In Pixel CMOS Image Sensor With Background Cancelling Capability for Remote Heart Rate Detection. - Chen Cao; Yuya Shirakawa; Leyi Tan; Min-Woong Seo; Keiichiro Kagawa; Keita Yasutomi; Sung-Wook Jun; Tomohiko Kosugi; Satoshi Aoyama; Nobukazu Teranishi; Norimichi Tsumura; Shoji Kawahito (IEEE J. Solid State Circuits, 2019)

A Sub-100 $ mu$ m-Range-Resolution Time-of-Flight Range Image Sensor With Three-Tap Lock-In Pixels, Non-Overlapping Gate Clock, and Reference Plane Sampling. - Keita Yasutomi; Yushi Okura; Keiichiro Kagawa; Shoji Kawahito (IEEE J. Solid State Circuits, 2019)

A Wide Dynamic Range CMOS Image Sensor with a Charge Splitting Gate and Two Storage Diodes. - Minho Lee 001; Min-Woong Seo; Juyeong Kim; Keita Yasutomi; Keiichiro Kagawa; Jang-Kyoo Shin; Shoji Kawahito (Sensors, 2019)

Plasmonic Color Filter Array with High Color Purity for CMOS Image Sensors. - Atsutaka Miyamichi; Atsushi Ono; Keiichiro Kagawa; Keita Yasutomi; Shoji Kawahito (Sensors, 2019)

Super Field-of-View Lensless Camera by Coded Image Sensors. - Tomoya Nakamura; Keiichiro Kagawa; Shiho Torashima; Masahiro Yamaguchi 002 (Sensors, 2019)

Palm-Controlled Pointing Interface Using a Dynamic Photometric Stereo Camera. - Yoshio Matsuda; Takashi Komuro; Takuya Yoda; Hajime Nagahara; Shoji Kawahito; Keiichiro Kagawa (HCI (48), 2020)

Single-Shot Real-Time Multiple-Path Time-of-Flight Depth Imaging for Multi-Aperture and Macro-Pixel Sensors. - Miguel Heredia Conde; Keiichiro Kagawa; Tomoya Kokado; Shoji Kawahito; Otmar Loffeld (ICASSP, 2020)

An 8-Tap CMOS Lock-In Pixel Image Sensor for Short-Pulse Time-of-Flight Measurements. - Yuya Shirakawa; Keita Yasutomi; Keiichiro Kagawa; Satoshi Aoyama; Shoji Kawahito (Sensors, 2020)

Transmission of correct gaze direction in video conferencing using screen-embedded cameras. - Kazuki Kobayashi; Takashi Komuro; Keiichiro Kagawa; Shoji Kawahito (Multim. Tools Appl., 2021)

Correction to: Transmission of correct gaze direction in video conferencing using screen-embedded cameras. - Kazuki Kobayashi; Takashi Komuro; Keiichiro Kagawa; Shoji Kawahito (Multim. Tools Appl., 2021)

High-Linearity High-Resolution Time-of-Flight Linear-Array Digital Image Sensor Using Time-Domain Feedback. - Juyeong Kim; Keita Yasutomi; Keiichiro Kagawa; Shoji Kawahito (Sensors, 2021)

A 38µm Range Precision Time-of-Flight CMOS Range Line Imager with Gating Driver Jitter Reduction Using Charge-Injection Pseudo Photocurrent Reference. - Keita Yasutomi; Tatsuki Furuhashi; Koki Sagawa; Taishi Takasawa; Keiichiro Kagawa; Shoji Kawahito (ISSCC, 2022)

Computational ultrafast CMOS image sensors. - Keiichiro Kagawa (OECC/PSC, 2022)

Resolving Multi-Path Interference in Compressive Time-of-Flight Depth Imaging with a Multi-Tap Macro-Pixel Computational CMOS Image Sensor. - Masaya Horio; Yu Feng; Tomoya Kokado; Taishi Takasawa; Keita Yasutomi; Shoji Kawahito; Takashi Komuro; Hajime Nagahara; Keiichiro Kagawa (Sensors, 2022)

A Dual-Mode 303-Megaframes-per-Second Charge-Domain Time-Compressive Computational CMOS Image Sensor. - Keiichiro Kagawa; Masaya Horio; Anh Ngoc Pham; Thoriq Ibrahim; Shin-ichiro Okihara; Tatsuki Furuhashi; Taishi Takasawa; Keita Yasutomi; Shoji Kawahito; Hajime Nagahara (Sensors, 2022)

Spatio-Temporal Super-Resolution for CS-Based ToF 3D Imaging. - Alvaro Lopez Paredes; Miguel Heredia Conde; Thoriq Ibrahim; Anh Ngoc Pham; Keiichiro Kagawa (EUSIPCO, 2023)

A Time-of-Flight Image Sensor Using 8-Tap P-N Junction Demodulator Pixels. - Ryosuke Miyazawa; Yuya Shirakawa; Kamel Mars; Keita Yasutomi; Keiichiro Kagawa; Satoshi Aoyama; Shoji Kawahito (Sensors, 2023)

Depth Quality Improvement with a 607 MHz Time-Compressive Computational Pseudo-dToF CMOS Image Sensor. - Anh Ngoc Pham; Thoriq Ibrahim; Keita Yasutomi; Shoji Kawahito; Hajime Nagahara; Keiichiro Kagawa (Sensors, 2023)

Simulation Methods for Lock-In Pixels Considering Gating Driver's Response. - Ryosuke Suzuki; Keita Yasutomi; Keiichiro Kagawa; Shoji Kawahito (IEEE SENSORS, 2024)

Single-Shot Efficient Depth Imaging Based on Time-Compressive CMOS Image Sensor. - Michitaka Yoshida; Daisuke Hayashi; De Xing Lioe; Keita Yasutomi; Shoji Kawahito; Keiichiro Kagawa; Hajime Nagahara (IEEE SENSORS, 2024)

Critical slowing down for relaxation in the Cahn-Hilliard equation with dynamic boundary conditions. - Keiichiro Kagawa; Yoshihiro Yamazaki (JSIAM Lett., 2024)