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. 2014 Jan 23;13:4. doi: 10.1186/1475-925X-13-4

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Copyright © 2014 Ben Chaabane and Fnaiech; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Spatial relationship between the current pixel (x,y) and its neighbors in the blocsW_xy. (a) The neighborhood N(x,y) of the current pixel (x,y), (b) weight coefficients for calculating the (ES1, ES2, ES3, ES4, ES5, ES6, ES7 and ES8) edge strengths of potential edge patterns.