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Article type: Cover
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Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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Article type: Index
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Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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Keishi HATTORI, Makoto IKEDA, Kunihiro ASADA
Article type: Article
Session ID: IST2011-17
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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This paper proposes a new mesh simplification algorithm based on edge decimation. It is suitable for hardware implementation that can work in realtime at a high speed.
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Shoji KAWAHITO, Zhuo LI, Keita YASUTOMI
Article type: Article
Session ID: IST2011-18
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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This article discusses pixel structure and time resolution of a time-resolved image sensor for fluorescence lifetime imaging. In time-resolved pixel structure using two-stage charge transfer, the time resolution of 160ps has been achieved in the lifetime measurements. This structure has a problem in creating potential barrier-less charge transfer structure which is necessary for high time resolution and weak signal detection. Trapping of signal electrons at the Si-SiO_2 interface in this structure causes a charge transfer delay. To solve these problems, a new time-resolved pixel structure using draining only modulation (DOM) is presented. A condition for getting high time resolution of less than 10ps is also discussed.
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Vu Truong Son DAO, Takeharu ETOH, Kohsei TAKEHARA, H. D. NGUYEN, Kenji ...
Article type: Article
Session ID: IST2011-19
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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A new ultra-high-speed image sensor "Hybrid CMOS/CCD ISAS" is presented. ISAS stands for "Image Signal Accumulation Sensor". A folded CCD is installed in each pixel, which serves as an in-situ memory for parallel recording at all pixels. The CCD is looped so that image signals captured at plural of capturing operations are automatically accumulated on the memory CCD. A CMOS readout circuitry is also installed in the pixel for fast and flexible signal readout. By directly reading out signals through the CMOS readout circuit without recording them in the in-pixel CCD memory, the sensor works as a conventional parallel and partial readout high-speed imager as well. A set of Z-shaped electrodes is proposed to fold the CCD and fabricate it with a standard CMOS process. Therefore, the sensor can be fabricated solely with a CIS process. Technical feasibility of the sensor is confirmed through simulations.
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Sousuke Shimoyama, Masayuki Ikebe, Masaki Igarashi, Akira Mizuno, Juni ...
Article type: Article
Session ID: IST2011-20
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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Local Histogram Equalization (LHE), which is efficient for High Dynamic Range (HDR) compression, requires a large amount of calculation and induces unnatural image quality. Using checker-wise histogram acquisition and line buffer, memory accessing for local histograms is processed in O(1) time. For improving image quality, we proposed approximation of LHE by compositing gamma functions. Moreover the control of local histogram is developed by introducing mean values of bins for suppression of stripe artifacts arising from small number of bins and halo effect. Using C++, we achieved two million pixels per 0.45sec operation.
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Tomohiro Ueda, Takehiro Niikura, Yoshihiro Watanabe, Takashi Komuro, M ...
Article type: Article
Session ID: IST2011-21
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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In interaction with virtual objects, there is a latency. Without compensating this, it is impossible to synchronize movements of body and the virtual object. The conventional method to compensate for latency is prediction by using a filter, and most research has focused on prediction filter algorithms. On the other hand, this study focuses on the camera's frame rate. By increasing it, the latency after image capturing is reduced, and also the tracking ability of the prediction filter is improved. As a result, we improved the ability to predict body movements, and realized synchronization accuracy.
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Hitoshi Matsuoka, Toshihiko Noda, Kiyotaka sasagawa, Takashi Tokuda, K ...
Article type: Article
Session ID: IST2011-22
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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Perfomance of polarization-analyzing CMOS image sensor was improved by using multiple polarization-analyzing pixel array sets. The accuracy of polarization analysis was improved to σ=0.0061deg. Using the present CMOS sensor, real-time chiral analysis of menthol solution was successfully measured.
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Tomoya IIDA, Kazuhiro SHIMONOMURA
Article type: Article
Session ID: IST2011-23
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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We describe silicon retina system that has robust color detection against changes in illumination color. Silicon retinas used have a logarithmic response and a function of a Laplacin-Gausian-lilae spntine filterimg. An input image is divided into red, green, and blue channels by color filters attached to camera lens. Then, opposite color responses, namely, red-green and yellow-blue awe calculated with output images from the silicon retinas, we enabled the color constancy of the system.
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Younwhan OH, Kazuhiro SHIMONOMURA
Article type: Article
Session ID: IST2011-24
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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We have built a foveated camera employing two cameras, a perspective camera and a omnidirectional camera. The omnicirectional camera is used to build a peripheral view field, which has wide view angle. The perspective camera is used to build a central view field (fovea), which has high resolution. This camera arrangement can make easy to compute the direction to the target in the peripheral view field.
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Shun KAWADA, Yasuyuki GODA, Rihito KURODA, Shigetoshi SUGAWA
Article type: Article
Session ID: IST2011-25
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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This paper reports improvement of color reproductivity with a new color matrix using the WRGB LOFIC CMOS image sensor which we had developed. A new signal which includes emerald green and yellow (EGY) ingredients is extracted from WRGB signals. And a linear matrix which is made up of the RGB and the EGY signals realizes high accurate color correction with a simple matrix calculation compared with a linear matrix made up only of the RGB signals.
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Yasuhisa Tochigi, Katsuhiko Hanzawa, Yuri Kato, Nana Akahane, Rihito K ...
Article type: Article
Session ID: IST2011-26
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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Aiming for the realization of the high-speed CMOS image sensor that achieves both burst image capturing at over-10M fps and continuous image capturing at 10K fps by a shingle chip, a prototype 72^H×32^V high-speed CMOS image sensor with 104 analog memories per pixel has been designed and fabricated. In this paper, we report the signal readout operations and trigger operations for both burst image capturing and continuous image capturing.
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Ayaka MIZUI, Akio KITAGAWA
Article type: Article
Session ID: IST2011-27
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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A spectrophotometric analysis helps us to know the characteristics of the materials. Digital cameras acquire color images by means of a sensor with a color filter array consists in red (R), green (G) and blue (B) filters. Therefore, digital cameras cannot restructure original spectrum of object due to measure only the light intensity of RGB. To restructure spectrum with higher quality, cameras need the function of spectrophotometry. In this work, we show using FDTD simulation that pinholes on the light-shielding metal selects wave of specific wavelength.
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Keisuke ANDO, Takuma KOBAYASHI, Toshihiko NODA, Kiyotaka SASAGAWA, Tak ...
Article type: Article
Session ID: IST2011-28
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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Implantation of a CMOS image sensor into the brain of a living animal can realize neural activity imaging in a deep brain with high spatio-temporal resolution. We have successfully demonstrated that employing a light guide array structure on a sensor improves a spatial resolution, even if without any optics such as a micro lens array. Fluorescence imaging of a mouse brain slice is demonstrated by using the fabricated sensor.
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Danya SUGAI, Takayuki HAMAMOTO
Article type: Article
Session ID: IST2011-29
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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We study the imaging system for reconstructing high-spatial resolution image using high-frame-rate images from an image sensor. Developing our proposed system, we designed a test circuit for the image sensor. The evaluation results show high speed response of our test circuit beyond 300 frames per second in the one pixel circuit, and real-time processing in 60 frames per second. In this paper, first we explain our proposed imaging system, second our test circuit for the image sensor, finally the evaluation results.
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Hironori YAMAGISHI, Keita SUZUKI, Takayuki HAMAMOTO
Article type: Article
Session ID: IST2011-30
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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In this paper, we propose the methods of depth estimation and free-viewpoint image synthesis using multiple cameras. The depth estimation method uses different block size at each pixel. And the depth information from the virtual camera is obtained by one real camera's depth information and interpolation processing. And, the method of free-viewpoint image synthesis uses ray vectors derived from the depth information. Then occlusion is distinguished by using them. The accuracy of free-viewpoint image synthesis is improved by selecting the camera without occlusion.
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Yoshiaki MIYAMOTO, Yoshihiro KAWASHIMA, Takayuki HAMAMOTO, Kazuya KODA ...
Article type: Article
Session ID: IST2011-31
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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In this paper, we propose a method of motion vector detection at a high frame rate on an image sensor and describe the design of the image sensor on which the method is implemented. In the proposed method, motion vector can be detected by 1×3 pixels matching with controlling the processing interval at a high frame rate. Additionally, the detection accuracy is much improved by restricting direction of the block and the search range using the direction of the edge pixels. The decimal-accuracy motion can be also detected by using movement information detected by the integer-accuracy matching. Thus, highly accurate motion vector detection is achieved.
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Isao Takayanagi
Article type: Article
Session ID: IST2011-32
Published: May 20, 2011
Released on J-STAGE: September 21, 2017
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The image quality of CMOS image sensors has been improved to the point that they can be used in high-end cameras such as digital still cameras and high-end video cameras. The overall performance improvement is due not only to pixel performance, but also to circuit technology, bringing FPN reduction, high-speed on-chip A/D conversion, high-speed/low power interface, etc. In this paper, technical issues for high-resolution and high-image quality image sensors will be discussed followed by an introduction of trends in CMOS image sensor circuits.
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Article type: Appendix
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Published: May 20, 2011
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Article type: Appendix
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Published: May 20, 2011
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Article type: Appendix
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Published: May 20, 2011
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