https://zh.wikipedia.org/wiki/%E7%B5%90%E6%A7%8B%E7%9B%B8%E4%BC%BC%E6%80%A7
https://ece.uwaterloo.ca/~z70wang/research/ssim/
The Structural SIMilarity (SSIM) index is a method for measuring the similarity between two images. The SSIM index can be viewed as a quality measure of one of the images being compared,provided the other image is regarded as of perfect quality. It is an improved version of the universal image quality index proposed before. Detailed description is given in the following paper:
1. Z. Wang, A. C. Bovik, H. R. Sheikh and E. P. Simoncelli,"Image quality assessment: From error visibility to structural similarity," IEEE Transactions on Image Processing, vol. 13,no. 4,pp. 600-612,Apr. 2004.
这篇论文引用15000多以上，在评价图像是否被改变上，非常重要的文章。
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