2001/07/16 by A. Nevado, A. Turiel, N. Parga
Physics and Astronomy · #cond-mat.stat-mech #cond-mat.dis-nn
published as NETWORK {\bf 11} 131-152 (2000) · 29 pages, 9 figures, LaTeX. Higher quality pictures can be requested from the authors
arxiv created 2001/07/16 · arxiv updated 2009/11/30
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 \citeNIPS97,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.