Hitoshi YAMADA^*, Kimihiro NISHIO^†, Masahiro OHTANI^‡, Hiroo YONEZU and Yuzo FURUKAWA

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

(Received March 23, 2004; Accepted July 6, 2004)

Inspired by a mechanism of biological vision systems, a model and a network of analog metal oxide semiconductor (MOS) circuits are proposed which display an optical flow with local adaptation to the relative velocity of a background image. A function of displaying an optical flow successfully worked as a result of simulations using the simulation program with integrated circuit emphasis (SPICE). A function of varying an optical flow at a certain instant by local adaptation was also demonstrated. The proposed network is suitable for the realization of a large-scale integrated circuit (LSI), which displays an optical flow with local adaptation to the local velocity of a background.

Key words: motion detection, optical flow, adaptation, analog MOS circuit, vision chip

^*Present Affliation: Research Laboratories, DENSO Corporation, 500-1, Minamiyama, Komenogi-cho, Nisshin 470-0111, Japan. E-mail address: HITOSHI{_}YAMADA@denso.co.jp
^†Present Affliation: Department of Electrical and Computer Engineering, Yonago National College of Technology, 4448, Hikona-cho, Yonago 683-8502, Japan
^‡Present Affliation: Department of Electrical Engineering, Nara National College of Technology, 22, Yata-cho, Yamatokoriyama, Nara 639-1080, Japan
E-mail address: yonezu@eee.tut.ac.jp