Hi, after image enhancement in frequency domain for assessment calculate psnr and value of psnr and snr is negative. class of input and output image is double.
ref = imread('img.tif'); ref=im2double(ref); %A = processing(ref);
%Calculate the PSNR.
[peaksnr, snr] = psnr(A, ref);
please guide me about valu of PSNR.
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