A $160{\times}120$ Light-Adaptive CMOS Vision Chip for Edge Detection Based on a Retinal Structure Using a Saturating Resistive Network

  • Kong, Jae-Sung (Department of Electronics, Kyungpook National University) ;
  • Kim, Sang-Heon (Department of Electronics, Kyungpook National University) ;
  • Sung, Dong-Kyu (Department of Electronics, Kyungpook National University) ;
  • Shin, Jang-Kyoo (Department of Electronics, Kyungpook National University)
  • Received : 2006.04.25
  • Published : 2007.02.28

Abstract

We designed and fabricated a vision chip for edge detection with a $160{\times}120$ pixel array by using 0.35 ${\mu}m$ standard complementary metal-oxide-semiconductor (CMOS) technology. The designed vision chip is based on a retinal structure with a resistive network to improve the speed of operation. To improve the quality of final edge images, we applied a saturating resistive circuit to the resistive network. The light-adaptation mechanism of the edge detection circuit was quantitatively analyzed using a simple model of the saturating resistive element. To verify improvement, we compared the simulation results of the proposed circuit to the results of previous circuits.