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Compare the quality between two images using RMSE, SSIM, and PSNR.The values of the PSNR can be predicted from the SSIM and vice-versa. ThePSNR and the SSIM mainly differ on their degree of sensitivity to image degradations.

The executable file is under x64/Release/Compare.exe

Compare image_file_name_1 image_file_name_2 [--mask] [--block_size] 2

• The optional mask parameter will neglect the total white or black pixels in the image1.
• The optional block_size parameter determines the window size of SSIM.
• The smaller block_size is, the slower it runs.

If the compilation fails, please fix the following environment variables:

• OPENCV_INC: Directory to OpenCV include folder.
• OPENCV_LIB: Directory to OpenCV libraries.
• PATH: Addthe executable DLLs of OpenCV and GLUT into an arbitrary directory of PATH.

The square root of the mean squared error. More sensitive than SSIM and PSNR in values.Wiki:https://en.wikipedia.org/wiki/Root-mean-square_deviation

The SSIM index is calculated on various windows of an image.Wiki:https://en.wikipedia.org/wiki/Structural_similarity

PSNR is most often defined via 10 multiplies the log10 of the normalized mean squared error (MSE).Wiki:https://en.wikipedia.org/wiki/Peak_signal-to-noise_ratio