ssim_index

This is an implementation of the algorithm for calculating the Structural SIMilarity (SSIM) index between two images. Please refer to the following paper: Z. Wang, A. C. Bovik, H. R. Sheikh, and E. P. Simoncelli, "Image quality assessment: From error measurement to structural similarity" IEEE Transactios on Image Processi ng, vol. 13, no. 4, Apr. 2004. ng, vol. 13, no. 4, Apr. 2004.