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An optical processor for zero-crossing edge detectionAn 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.
Document ID
19930069035
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jared, David A.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Johnson, Kristina M.
(Colorado Univ. Boulder, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: In: Visual information processing II; Proceedings of the Meeting, Orlando, FL, Apr. 14-16, 1993 (A93-53022 23-63)
Publisher: Society of Photo-Optical Instrumentation Engineers
Subject Category
Instrumentation And Photography
Accession Number
93A53032
Distribution Limits
Public
Copyright
Other

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