圖像的評價指標之PSNR——峯值信噪比

以及Python的實現

參考：
https://blog.csdn.net/szfhy/article/details/49615833
https://blog.csdn.net/zjyruobing/article/details/49908979
https://blog.csdn.net/edogawachia/article/details/78756680
https://www.cnblogs.com/vincent2012/archive/2012/10/13/2723152.html
https://www.cnblogs.com/ranjiewen/p/6390846.html
https://blog.csdn.net/laoxuan2011/article/details/51519062
https://zhuanlan.zhihu.com/p/50757421