[OPTICAL REVIEW Vol. 8, No. 5 (2001) 336-342]
Signal Formation of Image-Edge Motion Based on Biological Retinal Networks and Implementation into an Analog Metal-Oxide-Silicon Circuit
Hitoshi YAMADA1,*, Takashige MIYASHITA1,2, Masahiro OHTANI1, Kimihiro NISHIO1, Hiroo YONEZU1 and Yuzo FURUKAWA1
1Department of Electrical and Electronic Engineering, Toyohashi University of Technology, 1-1, Tempaku-cho, Toyohashi, 441-8580 Japan
(Received April 27, 2001; Accepted July 9, 2001)
A simplified model was proposed for the formation of edge signals and generation of motion signals of a target based on the information processing mechanisms of outer and inner retinas of a vertebrate. Analog metal-oxide-silicon (MOS) integrated circuits were designed based on the model. Simulation program with integrated circuit emphasis (SPICE) simulation results showed the performance of local adaptation over a wide dynamic range in the outer retinal circuit and generation of the velocity signal of a moving edge in the inner retinal circuit. Preliminary experimental results showed local adaptation in a given input range in the outer retinal circuit and the generation of motion pulsed signals in the inner retinal circuit.
Key words : motion detection, edge detection, local adaptation, inner retina, outer retina, analog MOS circuit