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Figure 6
Texture transformation on an image. Images were generated from a gray-level co-occurance matrix with isotropic direction and a pixel size d of six pixels; pij is the probability that a pixel at position ij will have the same value as one a distance d pixels away. (a) Original untransformed image; (b) entropy, [- \textstyle \sum_{i} \sum_{j} p_{ij} \log p_{ij} (x_{ij} - x_{\rm mean})^{2}/N]; (c) homogeneity, [\textstyle \sum_{i} \sum_{j} p_{ij}/ ( 1 + |i - j|)]; (d) energy, [\textstyle \sum_{i} \sum_{j}p_{ij}^{2}]; (e) contrast, [\textstyle \sum_{i} \sum_{j} |i - j|p_{ij}]; (f) root-mean-square deviation (r.m.s.d), [\textstyle \sum_{i} \sum_{j}].

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 58| Part 11| October 2002| Pages 1915-1923
doi:10.1107/S0907444902016840
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