Retinex Image Processing--Publications--NASA CR 198194
Conference
PROPERTIES OF A CENTER/SURROUND RETINEX PART ONE:
SIGNAL PROCESSING DESIGN
Zia-ur Rahman
Abstract
The 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.
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