Image Enhancement Factor (IEF)=MSE(Original Image, Noise Image) / MSE (Original Image, Restored Image)
I hope you can easily implement in Matlab, for detail you can check this leterature Or here it is, nore simply, you have three image, original_image, noisy_image and restored_image
MSE1=immse(original_image, noisy_image);
MSE2=immse(original_image, restored_image);
IEF=MSE1/MSE2;
fprintf('The Image Enhancement Factor is %.2f',IEF);
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