Failure of Luminance-Redness Correlation for Illuminant Estimation
Ciurea, F, and Funt, B. "Failure of Redness-luminance Correlation for Illuminant Estimation" In Proceedings 12th Color Imaging Conference, Scottsdale, pp 42-46 (2004)
Abstract:
We investigate the hypothesis, recently published in Nature,
that the human visual system may use some sort of
luminance-redness correlation2 together with the scene
average for illuminant estimation. We found this idea
interesting but not thoroughly tested. In particular, tests on
real images were limited to scenes made up artificially from
hyperspectral data,4 spectral power distributions of various
daylight illuminants, and the human cone sensitivity
functions. The Ruderman database4 of hyperspectral images
is also quite peculiar because it consists of a small number
of images of mostly foliage. Our experiments show that for
scenes composed from a more diversified hyperspectral
database combined with real illuminant spectra, the
predicted correlation turns out to be very weak. For actual
digital camera images, the luminance-redness correlation
fails completely.
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