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. 2016 Aug 1;11(8):e0159898. doi: 10.1371/journal.pone.0159898

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© 2016 Del Viva et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 6 — The gray histogram represents the probability distribution, in natural log scale, of the 2²⁷ possible 3x3 patterns, extracted from the dataset of RGB images used in this study [16]. The green curve is the model selection function with N = 500, W = 0.08. The green histogram is the probability distribution of corresponding selected patterns. The red histogram is the probability distribution of equiluminant patterns.