Hello,

Which programming language are you using?

You can use MATLAB built in function graycomatrix and graycoprops if your are using MATLAB as your implementation language.

Details can be found in the following link:

http://www.mathworks.com/help/images/ref/graycomatrix.html

http://www.mathworks.com/help/images/ref/graycoprops.html

If you are using python, you can first install scipy, numpy, and skimage and then use skimage.feature.greycomatrix and skimage.feature.greycoprops.  

You can also try LBP features, which are rotation invariant and illumination invariant. 

Let me know if you have any specific question about the detailed implementation. 

Thanks.