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Proceedings Paper

Real-time motion detection using an analog VLSI zero-crossing chip
Author(s): Wyeth Bair; Christof Koch
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Paper Abstract

The authors have designed and tested a one-dimensional 64 pixel, analog CMOS VLSI chip which localizes intensity edges in real-time. This device exploits on-chip photoreceptors and the natural filtering properties of resistive networks to implement a scheme similar to and motivated by the Difference of Gaussians (DOG) operator proposed by Marr and Hildreth (1980). The chip computes the zero-crossings associated with the difference of two exponential weighting functions and reports only those zero-crossings at which the derivative is above an adjustable threshold. A real-time motion detection system based on the zero- crossing chip and a conventional microprocessor provides linear velocity output over two orders of magnitude of light intensity and target velocity.

Paper Details

Date Published: 9 July 1991
PDF: 7 pages
Proc. SPIE 1473, Visual Information Processing: From Neurons to Chips, (9 July 1991); doi: 10.1117/12.45541
Show Author Affiliations
Wyeth Bair, California Institute of Technology and Hughes Artificial Intelligence Ctr. (United States)
Christof Koch, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 1473:
Visual Information Processing: From Neurons to Chips
Bimal P. Mathur; Christof Koch, Editor(s)

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