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Real-time edge-enhanced optical correlatorEdge enhancement of an input image by four-wave mixing a first write beam with a second write beam in a photorefractive crystal, GaAs, was achieved for VanderLugt optical correlation with an edge enhanced reference image by optimizing the power ratio of a second write beam to the first write beam (70:1) and optimizing the power ratio of a read beam, which carries the reference image to the first write beam (100:701). Liquid crystal TV panels are employed as spatial light modulators to change the input and reference images in real time.
Document ID
19920023778
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Liu, Tsuen-Hsi (Jet Propulsion Lab. California Inst. of Tech., Pasadena., United States)
Cheng, Li-Jen (Jet Propulsion Lab. California Inst. of Tech., Pasadena., United States)
Date Acquired
August 15, 2013
Publication Date
September 22, 1992
Subject Category
Optics
Report/Patent Number
Patent Number: NASA-CASE-NPO-18379-1-CU
Patent Application Number: US-PATENT-APPL-SN-797569
Patent Number: US-PATENT-5,150,228
Accession Number
92N33022
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-CASE-NPO-18379-1-CU|US-PATENT-5,150,228
Patent Application
US-PATENT-APPL-SN-797569

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