Why is cluster shade and information measure of correlation1 negative?

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Ann G
Ann G 2016-3-23
Hello...I have used the function http://www.mathworks.com/matlabcentral/fileexchange/22187-glcm-texture-features/content/GLCM_Features1.m in order to calculate the textural features..Cluster shade and information measure of correlation1 have negative values...Does anyone knows why is that happening?

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