A single and multi-scale SSIM implementation in C++
This source computes the PSNR and the SSIM index, a quality index defined by Wang, Bovik, Sheihk and Simoncelli that uses a top-down approach to image quality assessment, based on the following article of the above authors:
Image Quality Assessment: From Error Measuement to Structural Similarity, IEEE Transactions on Image Processing, Vol. 13, 2004.
The code was written by Felix Oum and Thomas Richter, and is based on the IMCO framework, developed by Thomas Richter for the image compression project of the TU Berlin. For legal restrictions, and the licence conditions, please check README.Legal.
Thomas Richter, January 2007