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Proceedings Paper

Orientation-Selective VLSI Retina
Author(s): Tim Allen; Carver Mead; Federico Faggin; Glenn Gribble
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Paper Abstract

In both biological and artificial pattern-recognition systems, the detection of oriented light-intensity edges is an important preprocessing step. We have constructed a silicon VLSI device containing an array of photoreceptors with additional hardware for computing center-surround (edge-enhanced) response as well as edge orientation at every point in the receptor lattice. Because computing the edge orientations in the array local to each photoreceptor would have made each pixel-computation unit too large (thereby reducing the resolution of the device), we devised a novel technique for computing the orientations outside of the array. All the transducers and computational elements are analog circuits made with a conventional CMOS process.

Paper Details

Date Published: 25 October 1988
PDF: 7 pages
Proc. SPIE 1001, Visual Communications and Image Processing '88: Third in a Series, (25 October 1988); doi: 10.1117/12.969056
Show Author Affiliations
Tim Allen, Synaptics, Inc. (United States)
Carver Mead, Synaptics, Inc. (United States)
Federico Faggin, Synaptics, Inc. (United States)
Glenn Gribble, Synaptics, Inc. (United States)


Published in SPIE Proceedings Vol. 1001:
Visual Communications and Image Processing '88: Third in a Series
T. Russell Hsing, Editor(s)

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