Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2001-07-16
NETWORK {\bf 11} 131-152 (2000)
Physics
Condensed Matter
Statistical Mechanics
29 pages, 9 figures, LaTeX. Higher quality pictures can be requested from the authors
Scientific paper
We report results on the scaling properties of changes in contrast of natural images in different visual environments. This study confirms the existence, in a vast class of images, of a multiplicative process relating the variations in contrast seen at two different scales, as was found in \cite{NIPS97,TuMaPaNa98}. But it also shows that the scaling exponents are not universal: Even if most images follow the same type of statistics, they do it with different values of the distribution parameters. Motivated by these results, we also present the analysis of a generative model of images that reproduces those properties and that has the correct power spectrum. Possible implications for visual processing are also discussed.
Nevado A.
Parga Nestor
Turiel Antonio
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