Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Resolution improvement of a CMOS vision chip for edge detection by separating photo-sensing and edge detection circuits

수광 회로와 윤곽 검출 회로의 분리를 통한 윤곽 검출용 시각칩의 해상도 향상

  • Kong, Jae-Sung (Department of Electronics, Kyungpook National University) ;
  • Suh, Sung-Ho (System LSI Division, Samsung Electronics Co., Ltd.) ;
  • Kim, Sang-Heon (Department of Electronics, Kyungpook National University) ;
  • Shin, Jang-Kyoo (Department of Electronics, Kyungpook National University) ;
  • Lee, Min-Ho (Department of Electronics, Kyungpook National University)
  • Published : 2006.03.31
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Abstract

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.

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