All issues
Predecessor
26.42
Displaying 1-19 of 19 articles from this issue
- |<
- <
- 1
- >
- >|
-
Article type: Cover
Pages Cover1-
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (12K) -
Article type: Index
Pages Toc1-
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (75K) -
Shigeru Yanaka, Takayuki Kimura, Hiromitsu ShirakiArticle type: Article
Session ID: IPU2002-34
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSLogarithmic conversions of photo current to voltage have been tried to increase dynamic range of image sensors. The conversion had succeeded only when sub threshold region V_G-I_D characteristics of MOS transistor was used. It was clarified in this paper that various γ characteristics (the slope of logarithmic photo current to gate voltage) can be achieved in MOS transistors with non-uniform substrate impurity concentrations and various buried channel transistors.View full abstractDownload PDF (491K) -
Koji YAMAMOTO, Keiichiro KAGAWA, Jun OHTA, Masahiro NUNOSHITA, Yasushi ...Article type: Article
Session ID: IPU2002-35
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe image sensor for detecting modulated light is proposed. The pixel has two floating diffusion regions to store charges. By operating the circuit synchronously to the blink of modulated light and subtracting two outputs, we can obtain signals only by modulated light. In this paper, we show the experimental results of the image sensor with 64 × 64 pixels. We demonstrate that this image sensor can capture the image only by modulated light under any static background light. The problems caused by the parasitic n^+ diffusion layer and diffusion carriers are improved.View full abstractDownload PDF (531K) -
Shoji KAWAHITO, Nobuhiro KAWAI, Hajime TAKASHIMAArticle type: Article
Session ID: IPU2002-36
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, we propose a signal processing technique to reduce the noise level of CMOS image sensors. The proposed method uses high-speed non-destructive readout mode of active pixel CMOS image sensors, noise feedback column amplification, and least square noise estimation. The input-referred noise can be reduced to less than 3 electrons.View full abstractDownload PDF (525K) -
Kazuaki SAWADA, Takahiro OHSHINA, Hidekuni TAKAO, Makoto ISHIDAArticle type: Article
Session ID: IPU2002-37
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA novel chemical sensor array is proposed and the prototype one was successively fabricated. On the proposed sensor, a photo sensor and a chemical potential sensor are fused in a same pixel of the sensor arrays to measure a fluorescence and a chemical potential information on the same time, and the sensing part of the photo sensor coincides with that of the chemical potential sensor exactly. The prototype one is fabricated using a CCD process. The principle of the device is based on the charge transfer techniques. The fabricated fused image sensor was able to detect the light power and the chemical potential with one sensing part, and was measured each information without mutual interference.View full abstractDownload PDF (552K) -
Tetsuya ASAI, Yoshihito AMEMIYAArticle type: Article
Session ID: IPU2002-38
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe propose analog CMOS circuits that implement Wilson-Cowan (WC) oscillators. The WC circuits collectively produce various dissipative patterns (e.g., Turing patterns and spiral ones) on the chip. The chip consists of i) reaction circuits that emulate elementary interactions between neurons (or chemical substances) and ii) diffusion devices that imitate synapses (or chemical diffusion of the substances). Utilizing the dissipative properties of the chip, we developed novel image-processing systems. In this report, we show that the chip produces a stable fingerprint pattern without noises and unnatural discontinuities of wrinkles, when a real fingerprint image was given to the chip as initial states. These results imply future potentialities of RD chips in engineering applications.View full abstractDownload PDF (487K) -
Junichi AKITA, Misako TAKAYASU, Hideki TAKAYASU, Amane KOIZUMIArticle type: Article
Session ID: IPU2002-39
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe integration of signal processing circuit in imase sensor, so called 'Vision Chip' is widely studied, but most of them don't aim at extracting image's meaning, which is often useful for the application of robot vision. In this paper, we propose a novel architecture for image sensor detecting the speed and the direction of moving point on focal plain. This architecture has an possibility to solve the direction dependency problem derived from matrix placement of pixels, and we consider a basic architecture for arbitrarily directional motion detection.View full abstractDownload PDF (587K) -
Seiji KAMEDA, Tetsuya YAGIArticle type: Article
Session ID: IPU2002-40
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA silicon retina was fabricated to emulate two fundamental types of response in the vertebrate retinal circuit, i.e. the sustained response and the transient response. The outputs of the silicon retina emulating the sustained response exhibit a Laplacian-Gaussian- like receptive field and therefore carry out a smoothing and a contrast enhancement on input images. The outputs emulating the transient response were obtained by subtracting subsequent images that were smoothed by a resistive network and therefore are sensitive to moving object. The chip was applied for a real time image processing in indoor illumination.View full abstractDownload PDF (1124K) -
Kazuhiro SHIMONOMURA, Keisuke INOUE, Seiji KAMEDA, Tetsuya YAGIArticle type: Article
Session ID: IPU200-41
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA vision system that is consisted of a silicon retina and a FPGA (Field Programmable Gate Array) was presented. A silicon retina is an intelligent CMOS imager which emulates real-time image processing funcion of the vertebrate retina. With the ability of effective preprocessing and specific applicable circuit, this system can perform robust image processing in natural scenes. A compact hardware and low power consamption allow this vision system to be embedded in small robots or devices.View full abstractDownload PDF (712K) -
Tomoki MATSUBARA, Yuji OHKAWA, Kazunori MIYAKAWA, Siro SUZUKI, Tamotsu ...Article type: Article
Session ID: IPU2002-42
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWith the aim of developing an ultra-high-sensitivity, excellent-picture-quality and highly reliable HDTV camera, we investigated ways to suppress the occurrence of defects on 15μm-thick New-Super-HARP photoconductive film when the camera is shooting intense spot lights. We found defect occurrence can be suppressed by increasing the film's operating temperature to higher than the conventional 25℃. Optimizing the concentration of impurities doped in the film improved its heat-resistance, enabling it to be used at temperatures as high as 35℃, thereby suppressing defect occurrence. An ultra-high sensitivity HDTV handheld camera equipped with this improved New-Super-HARP film and featuring high reliability and mobility is applicable to medical and scientific studies, as well as broadcasting use such as in reporting breaking news at night.View full abstractDownload PDF (830K) -
Rui SHOGENJI, Yoshiro KITAMURA, Jun TANIDAArticle type: Article
Session ID: IPU2002-43
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA compact image capturing system called TOMBO (Thin observation module by bound optics) used proposed. The TOMBO system is an instance of opto-electronic hybrid system, in which a compound-eye imaging optics is utilized for very thin system configuration and digital processing of the captured multiple images is applied to retrieve the object image. Experimental results using the TOMBO prototype system are shown. Also a compact fingerprint capturing system using the TOMBO is described.View full abstractDownload PDF (866K) -
Keiji UMETANIArticle type: Article
Session ID: IPU2002-44
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSAt SPring-8, a microangiography system with spatial resolution down to 10μm was developed using an X-ray direct-conversion type detector incorporating an X-ray SATICON pickup tube for biomedical imaging. An X-ray image is directly converted into an electric signal in a photoconductive layer without image blur. Because of the large depth of field, the microangiography system using a nearly parallel synchrotron radiation beam has advantages over light microscopes for imaging of internal structures of centimeter-sized objects with resolution in the micrometer range. Rat tumor blood vessels with diameters of 20-30μm in a vascular network produced by angiogenesis were visualized after contrast material injection.View full abstractDownload PDF (1158K) -
Hodeo Kawai, Motoshi SHIBATA, Aasko BABA, Masaki YAMAMOTO, Yoshinori T ...Article type: Article
Session ID: IPU2002-45
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn a conventional image processing, information from the real world is received by the CCD, and subsequently has to be transformed into serial data. This parallel-serial transformation is a bottleneck in the conventional system, and it restricts processing speed. In order to alleviate this bottleneck, we developed an optical parallel processing system consisting of digital smart pixel arrays with the frame rate of <1ms/frame and free space optical interconnections. We have also developed a high-speed machine control system with this optical parallel processing system, in which two digital smart pixel arrays are optically connected. This system is the first actual working system that uses optical parallel processing.View full abstractDownload PDF (592K) -
Shingo KAGAMI, Takashi KOMURO, Masatoshi ISHIKAWAArticle type: Article
Session ID: IPU2002-46
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA pixel-level A-D conversion method suited for digital vision chips is described. In this method, both of photo-detector-reading timings and input reference voltages are controlled by software in order to improve the sensitivity and at the same time to suppress the noises. An adaptive image sensing algorithm that dynamically controls the intensity response using this method is also described.View full abstractDownload PDF (621K) -
Tetsuo FURUMIYA, Keiichi ISAKARI, Akihiro UEHARA, Keiichiro KAGAWA, Ju ...Article type: Article
Session ID: IPU2002-47
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe are developing a vision chip implanted in the eyeball. To introduce stimulus charges to the retinal tissues, we propose a new structure composed of a synchronous PFM photosensor, a digital pulse shaper, a stimulus amplifier, and an electrode. To demonstrate fundamental functions, we designed the PFM vision chip with 32×32 pixels. To realize variable photosensitivity in a digital manner, a PFM photosensor with a binary frequency divider is designed, and its function was verified by simulation.View full abstractDownload PDF (451K) -
N. INOKIHARA, T. WAKAMATSU, T. HAMAMOTO, K. AIZAWAArticle type: Article
Session ID: IPU2002-48
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe have been investigating a new technique of on-sensor analog to digital conversion. In this paper, we describe a new 64×32 pixels A/D conversion image sensor. In this sensor, small 1bit comparators detect each bit of pixel value by using non-destructive readout in column parallel, repeatedly. We have fabricated the second prototype by 2-poly 2-metal 0.8 μm CMOS process. We describe the processing scheme of our ADC, simulation results, and the circuits design of the second prototype. We show results of some experiments obtained by the prototype.View full abstractDownload PDF (639K) -
Article type: Appendix
Pages App1-
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (72K) -
Article type: Appendix
Pages App2-
Published: June 21, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (72K)
- |<
- <
- 1
- >
- >|