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24 October 2005 Retinex software or diffractive-optical correlator hardware: the basis of human color vision?
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Edwin Land--based on photometric data--tried to explain through a retinex (retina + cortex) model calculating scaled integrated reflectances, how human color vision determines the perceived hues of colored Mondrian patches by relating illuminants and 'energies at the eye' and including calculation over the whole image. An alternative--purely optical--model, the diffractive-optical correlator hardware in aperture and image space of the human eye, relating 'local' data onto 'global' data in color vision, becomes illustrated. Based on Edwin Land's experimental data it is shown how the perceived hues result from diffractive-optical transformations and cross-correlations between object space and reciprocal space (RGB space), from matrix multiplications and divisions in vector space. Optical pre-processing causes that our eyes do not see what (physically) is real, but what they optically have calculated. This same diffractive-optical mechanism has also lead to an explanation of the phenomenon of paradoxically colored shadows, shortly re-presented in the introduction.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
N. Lauinger "Retinex software or diffractive-optical correlator hardware: the basis of human color vision?", Proc. SPIE 6006, Intelligent Robots and Computer Vision XXIII: Algorithms, Techniques, and Active Vision, 600604 (24 October 2005);

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