Figure 3.

Sample image (a) with its Gray-Level Co-occurrence Matrix for horizontal neighborhood (b). (a) Sample 4x3 image with pixels of 4 possible gray values (from 0 to 3); exemplary neighbors are marked; (b) Gray-Level Co-occurrence Matrix (GLCM) calculated for the sample image; numbers in the matrix denote numbers of specific pairs of neighbor pixels – row index corresponds to the value of left pixel in sample image, column index corresponds to the value of right pixel.