Introduction - If you have any usage issues, please Google them yourself
the equivalent of Zhou Wang s SSIM matlab code
//with K1 = 0.01, K2 = 0.03 and windows = ones(8) since this enables a fast implementation using summed area tables.
//the measure is described in "Image quality assessment: From error measurement to structural similarity"
//was originally adapted from the matlab code for the universal image quality index