Title :
A silicon retina system that calculates direction of motion
Author :
Kameda, S. ; Yagi, T.
Author_Institution :
Osaka Univ., Japan
Abstract :
A silicon retina was fabricated to emulate two fundamental types of response in the vertebrate retinal circuit, namely the sustained and transient responses. The sustained response exhibits a Laplacian-Gaussian-like receptive field. The transient response is obtained by subtracting consecutive image frames. The outputs of the chip are offset-suppressed analog voltages since uncontrollable mismatches of transistor characteristics are compensated for with the aid of sample/hold circuits embedded in each pixel circuit. The chip was applied to extract direction of motion using FPGA in real-time under an indoor illumination.
Keywords :
computer vision; field programmable gate arrays; image motion analysis; sample and hold circuits; FPGA; Laplacian-Gaussian receptive field; Si; direction of motion; image processing; sample/hold circuit; silicon retina; sustained response; transient response; CMOS image sensors; Circuits; Data mining; Field programmable gate arrays; Lighting; Retina; Silicon; Transient response; Voltage; Yagi-Uda antennas;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1206316
