[OPTICAL REVIEW Vol. 14, No. 3 (2007) 111-119]
© 2007 The Optical Society of Japan

Analog Vision Chip for Motion Detection of an Approaching Object against a Moving Background Based on the Insect Visual System

Kimihiro NISHIO*, Hiroo YONEZU, and Yuzo FURUKAWA

Department of Electrical and Electronic Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan

(Received November 16, 2006; Accepted February 15, 2007)

A network for motion detection of an approaching object without influence of the moving background was proposed based on the insect visual system. The two-dimensional array of the analog complementary metal oxide semiconductor (CMOS) circuits for extracting the edge signals of the approaching object without outputting those of the moving background was inserted at the first stage of the network. At the next stage, analog CMOS circuits for detection of approaching velocity and direction, which accept the extracted edge signals, were inserted based on the locust vision system. A chip of the proposed network was fabricated with the 1.2 μm CMOS process. It was clarified from the measured results and the simulation results with the simulation program with integrated circuit emphasis (SPICE) that the two-dimensional circuits of the first stage can only generate the signals of target edges. The measured results showed that the chip can detect the approaching velocity and direction of the target in the image which contains the moving background.

Key words: analog integrated circuit, motion detection, edge detection, vision chip

*Present affiliation: Department of Electrical and Computer Engineering, Yonago National College of Technology, 4448 Hikona-cho, Yonago, Tottori 683-8502, Japan. E-mail address: nishio@yonago-k.ac.jp