27 August 1993 Optical processor for zero-crossing edge detection
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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 micrometers 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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David A. Jared, David A. Jared, Kristina M. Johnson, Kristina M. Johnson, } "Optical processor for zero-crossing edge detection", Proc. SPIE 1961, Visual Information Processing II, (27 August 1993); doi: 10.1117/12.150950; https://doi.org/10.1117/12.150950

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