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Properties of a center/surround retinex. Part 1: Signal processing designThe last version of Edwin Land's retinex model for human vision's lightness and color constancy has been implemented. Previous research has established the mathematical foundations of Land's retinex but has not examined specific design issues and their effects on the properties of the retinex operation. Here we describe the signal processing design of the retinex. We find that the placement of the logarithmic function is important and produces best results when placed after the surround formation. We also find that best rendition is obtained for a 'canonical' gain-offset applied after the retinex operation.
Document ID
19960000854
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Rahaman, Zia-Ur (Science and Technology Corp. Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1995
Subject Category
Instrumentation And Photography
Report/Patent Number
NASA-CR-198194
NAS 1.26:198194
Accession Number
96N10854
Funding Number(s)
CONTRACT_GRANT: NAS1-19603
PROJECT: RTOP 233-01-03-20
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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