• 제목/요약/키워드: vision chip

검색결과 81건 처리시간 0.027초

Light-Adaptive Vision System for Remote Surveillance Using an Edge Detection Vision Chip

  • Choi, Kyung-Hwa;Jo, Sung-Hyun;Seo, Sang-Ho;Shin, Jang-Kyoo
    • 센서학회지
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    • 제20권3호
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    • pp.162-167
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    • 2011
  • In this paper, we propose a vision system using a field programmable gate array(FPGA) and a smart vision chip. The output of the vision chip is varied by illumination conditions. This chip is suitable as a surveillance system in a dynamic environment. However, because the output swing of a smart vision chip is too small to definitely confirm the warning signal with the FPGA, a modification was needed for a reliable signal. The proposed system is based on a transmission control protocol/internet protocol(TCP/IP) that enables monitoring from a remote place. The warning signal indicates that some objects are too near.

단위 픽셀 회로의 간소화를 통해서 해상도를 향상시킨 이차원 윤곽 검출용 시각칩 (Vision chip for edge detection with resolution improvement through simplification of unit-pixel circuit)

  • 성동규;공재성;현효영;신장규
    • 센서학회지
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    • 제17권1호
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    • pp.15-22
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    • 2008
  • When designing image sensors including a CMOS vision chip for edge detection, resolution is a significant factor to evaluate the performance. It is hard to improve the resolution of a bio-inspired CMOS vision using a resistive network because the vision chip contains many circuits such as a resistive network and several signal processing circuits as well as photocircuits of general image sensors such as CMOS image sensor (CIS). Low resolution restricts the use of the application systems. In this paper, we improve the resolution through layout and circuit optimization. Furthermore, we have designed a printed circuit board using FPGA which controls the vision chip. The vision chip for edge detection has been designed and fabricated by using $0.35{\mu}m$ double-poly four-metal CMOS technology, and its output characteristics have been investigated.

Retina-Motivated CMOS Vision Chip Based on Column Parallel Architecture and Switch-Selective Resistive Network

  • Kong, Jae-Sung;Hyun, Hyo-Young;Seo, Sang-Ho;Shin, Jang-Kyoo
    • ETRI Journal
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    • 제30권6호
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    • pp.783-789
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    • 2008
  • A bio-inspired vision chip for edge detection was fabricated using 0.35 ${\mu}m$ double-poly four-metal complementary metal-oxide-semiconductor technology. It mimics the edge detection mechanism of a biological retina. This type of vision chip offer several advantages including compact size, high speed, and dense system integration. Low resolution and relatively high power consumption are common limitations of these chips because of their complex circuit structure. We have tried to overcome these problems by rearranging and simplifying their circuits. A vision chip of $160{\times}120$ pixels has been fabricated in $5{\times}5\;mm^2$ silicon die. It shows less than 10 mW of power consumption.

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출력옵셋의 제거기능을 가지는 윤곽 및 움직임 검출용 시각칩 (Vision Chip for Edge and Motion Detection with a Function of Output Offset Cancellation)

  • 박종호;김정환;서성호;신장규;이민호
    • 센서학회지
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    • 제13권3호
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    • pp.188-194
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    • 2004
  • With a remarkable advance in CMOS (complimentary metal-oxide-semiconductor) process technology, a variety of vision sensors with signal processing circuits for complicated functions are actively being developed. Especially, as the principles of signal processing in human retina have been revealed, a series of vision chips imitating human retina have been reported. Human retina is able to detect the edge and motion of an object effectively. The edge detection among the several functions of the retina is accomplished by the cells called photoreceptor, horizontal cell and bipolar cell. We designed a CMOS vision chip by modeling cells of the retina as hardwares involved in edge and motion detection. The designed vision chip was fabricated using $0.6{\mu}m$ CMOS process and the characteristics were measured. Having reliable output characteristics, this chip can be used at the input stage for many applications, like targe tracking system, fingerprint recognition system, human-friendly robot system and etc.

A Low Power Analog CMOS Vision Chip for Edge Detection Using Electronic Switches

  • Kim, Jung-Hwan;Kong, Jae-Sung;Suh, Sung-Ho;Lee, Min-Ho;Shin, Jang-Kyoo;Park, Hong-Bae;Choi, Chang-Auck
    • ETRI Journal
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    • 제27권5호
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    • pp.539-544
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    • 2005
  • An analog CMOS vision chip for edge detection with power consumption below 20mW was designed by adopting electronic switches. An electronic switch separates the edge detection circuit into two parts; one is a logarithmic compression photocircuit, the other is a signal processing circuit for edge detection. The electronic switch controls the connection between the two circuits. When the electronic switch is OFF, it can intercept the current flow through the signal processing circuit and restrict the magnitude of the current flow below several hundred nA. The estimated power consumption of the chip, with $128{\times}128$ pixels, was below 20mW. The vision chip was designed using $0.25{\mu}m$ 1-poly 5-metal standard full custom CMOS process technology.

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수광 회로와 윤곽 검출 회로의 분리를 통한 윤곽 검출용 시각칩의 해상도 향상 (Resolution improvement of a CMOS vision chip for edge detection by separating photo-sensing and edge detection circuits)

  • 공재성;서성호;김상헌;신장규;이민호
    • 센서학회지
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    • 제15권2호
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    • pp.112-119
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    • 2006
  • Resolution of an image sensor is very significant parameter to improve. It is hard to improve the resolution of the CMOS vision chip for edge detection based on a biological retina using a resistive network because the vision chip contains additional circuits such as a resistive network and some processing circuits comparing with general image sensors such as CMOS image sensor (CIS). In this paper, we proved the problem of low resolution by separating photo-sensing and signal processing circuits. This type of vision chips occurs a problem of low operation speed because the signal processing circuits should be commonly used in a row of the photo-sensors. The low speed problem of operation was proved by using a reset decoder. A vision chip for edge detection with $128{\times}128$ pixel array has been designed and fabricated by using $0.35{\mu}m$ 2-poly 4-metal CMOS technology. The fabricated chip was integrated with optical lens as a camera system and investigated with real image. By using this chip, we could achieved sufficient edge images for real application.

MOSFET의 부정합에 의한 출력옵셋 제거기능을 가진 윤곽검출용 시각칩의 설계 (Design of a Vision Chip for Edge Detection with an Elimination Function of Output Offset due to MOSFET Mismatch)

  • 박종호;김정환;이민호;신장규
    • 센서학회지
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    • 제11권5호
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    • pp.255-262
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    • 2002
  • 인간의 망막은 효율적으로 주어진 물체의 윤곽을 검출할 수 있다. 본 연구에서는 윤곽검출에 관여하는 망막 세포의 기능을 전자회로로 모델링하여 윤곽검출기능을 가지는 CMOS 시각칩을 설계하였다. CMOS 제조공정 중에는 여러 가지 요인에 의해 MOSFET의 특성이 변화할 수 있으며, 특히 어레이로 구성되어 각 픽셀의 신호를 출력하는 readout 회로에서의 특성변화는 출력옵셋으로 나타난다. 하드웨어로 입력영상의 윤곽을 검출하는 시각칩은 다른 응용시스템의 입력단에 사용되므로 이러한 옵셋은 전체 시스템의 성능을 결정하는 중요한 요소이다. 본 연구에서는 이와 같은 출력단의 옵셋을 제거하기 위해 CDS(Correlated Double Sampling) 회로를 이용한 윤곽 검출용 시각칩을 설계하였다. 설계된 시각칩은 CMOS 표준공정을 이용하여 다른 회로와 집적화가 가능하며, 기존의 시각칩보다 신뢰성 있는 출력특성을 나타냄으로써, 물체의 윤곽을 이용하는 물체추적, 지문인식, 인간 친화적 로봇시스템등의 다양한 응용 시스템의 입력단으로 적용될 수 있을 것이다.

다자유도 구동스테이지와 비전시스템을 이용한 플립칩 본더 개발 (Development of the Flip-Chip Bonder using multi-DOF Motion Stage and Vision System)

  • 황달연;전승진;김기범
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.1717-1722
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    • 2003
  • In this paper we developed flip-chip bonder using XY stage, liner-rotary actuator and vision system. We depicted the major parts of the developed flip-chip bonder. Then we discussed several problems and their solutions such as vision and motion control, pick-up module position accuracy, separation of chip from the blue taped hoop, etc. We used a post guide to improve the horizontal positional accuracy against the long arm. Also, we used an ejector module and synchronization technique for easy chip separation from the blue tape.

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비젼 피드백 제어를 이용한 광통신 Laser Diode Test Device 개발 (Development of Laser Diode Test Device using Feedback Control with Machine Vision)

  • 유철우;송문상;김재희;박상민;유범상
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.1663-1667
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    • 2003
  • This thesis is on tile development of LD(Laser Diode) chip tester and the control system based on graphical programming language(LabVIEW) to control the equipment. The LD chip tester is used to test the optic power and the optic spectrum of the LD Chip. The emitter size of LD chip and the diameter of the receiver(optic fiber) are very small. Therefore, in order to test each chip precisely, this tester needs high accuracy. However each motion part of the tester could not accomplish hish accuracy due to the limit of the mechanical performance. Hence. an image processing with machine vision was carried out in order to compensate for the error. and also a load test was carried out so as to reduce tile impact of load on chip while the probing motion device is working. The obtained results were within ${\pm}$5$\mu\textrm{m}$ error.

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픽셀의 고정 패턴 잡음을 감소시킨 윤곽 검출용 시각칩 (Vision chip for edge detection with a function of pixel FPN reduction)

  • 서성호;김정환;공재성;신장규
    • 센서학회지
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    • 제14권3호
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    • pp.191-197
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    • 2005
  • When fabricating a vision chip, we should consider the noise problem, such as the fixed pattern noise(FPN) due to the process variation. In this paper, we propose an edge-detection circuit based on biological retina using the offset-free column readout circuit to reduce the FPN occurring in the photo-detector. The offset-free column readout circuit consists of one source follower, one capacitor and five transmission gates. As a result, it is simpler and smaller than a general correlated double sampling(CDS) circuit. A vision chip for edge detection has been designed and fabricated using $0.35\;{\mu}m$ 2-poly 4-metal CMOS technology, and its output characteristics have been investigated.