​​http://www.opencv.org.cn/opencvdoc/2.3.2/html/doc/tutorials/highgui/video-input-psnr-ssim/video-input-psnr-ssim.html​​

​​https://www.w3cschool.cn/opencv/opencv-v4na2dr6.html​​

​​https://docs.opencv.org/master/d5/dc4/tutorial_video_input_psnr_ssim.html​​