NASA NTRS · 19930069035
An optical processor for zero-crossing edge detection
Abstract
An optical processor for zero-crossing edge detection is presented, which consists of two defocused imaging systems to perform the Gaussian convolutions and a VLSI, ferroelectric liquid crystal spatial light modulator (SLM) to determine the zero-crossings. The zero-crossing SLM is a 32 x 32 array of pixels located on 100 microns centers. Each pixels contains a phototransistor, an auto-scaling amplifier, a zero-crossing detection circuit, and a liquid crystal modulating pad. Electrical and optical characteristics of the zero-crossing SLM are presented along with experimental results of the system.
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Jared, David A., Johnson, Kristina M.. 1993-01-01. An optical processor for zero-crossing edge detection. https://ntrs.nasa.gov/citations/19930069035
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