PSNR MSE R RMSE NRMSE MAPE Calculating

finding PSNR MSE R RMSE NRMSE MAPE

% INPUT
% Refernce M x N
% Test M x N
% Output
% Result-struct
% 1.MSE (Mean Squared Error)
% 2.PSNR (Peak signal-to-noise ratio)
% 3.R Value
% 4.RMSE (Root-mean-square deviation)
% 5.NRMSE (Normalized Root-mean-square deviation)
% 6.MAPE (Mean Absolute Percentage Error)