Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
Volume 20, Issue 1, Pages 56-66Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAA.20.000056
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A mathematical framework that permits the factorization of a joint probability distribution into its localized components for a two-dimensional array of pixels is presented. The factorization was used to estimate the contribution to mutual information of two- (I-2) and three-pixel (I-3) luminance correlations for a large ensemble of natural images analyzed at various spatial scales and pixel depths b. It is shown that both 12 and I-3 saturate at b similar to 6 bits per pixel. Three-pixel correlations are shown to produce only a marginal increase of information redundancy (4%) over two-pixel correlations (50%). Implications for neural representation in visual cortex are discussed. (C) 2003 Optical Society of America.
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