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Dynamic-Range Compression For Infrared ImageryPhotorefractive crystals covering detectors prevent saturation. To make full use of information in image, desirable to compress dynamic range of input intensity to within region of approximately linear response of detector. Dynamic-range compression exhibited by measurements of attenuation in photorefractive GaAs. Effective dynamic-range-compressor plate, film, or coating reduces apparent contrast of scene imaged on detector plane to within dynamic range of detectors; original image contrast or intensity data recovered subsequently in electronic image processing because range-compression function and inverse known.
Document ID
19890000289
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Cheng, Li-Jen
(Caltech)
Liu, Hua-Kuang
(Caltech)
Date Acquired
August 14, 2013
Publication Date
June 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 6
ISSN: 0145-319X
Subject Category
Physical Sciences
Report/Patent Number
NPO-17140
Accession Number
89B10289
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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