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Autocorrelation function
Autocorrelation function can detect
repetitive paterns of texels
Also defines fineness/coarseness of the
texture
Compare the dot product (energy) of non
shifted image with a shifted
image 
Autocorrelation function can detect
repetitive paterns of texels
Also defines fineness/coarseness of the
texture
Compare the dot product (energy) of non
shifted image with a shifted
image