RMSE and PSNR

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MSE (mean squared error)

RMSE (root mean squared error)

PSNR (peak signal-to-noise ratio)

The unit of PSNR is dB (decibel). It takes from 0 to infinity. If the value is high, the image quality is high.

Suppose that the original image is S_original, and the damaged image is S_noisy, then these value would be as follows.

In case of 8bit image, MAX=255.

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