negetive valu for PSNR after image enhancment in MATLAB

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fred bnm
fred bnm 2016-5-15
评论： Image Analyst 2016-5-19
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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Image Analyst
Image Analyst 2016-5-16
What is A??? And you forgot to attach img.tif and the "A" image, so I'm not going to do anything yet.
Since
PSNR=10log10(peakval^2/MSE)
and since you can't have negative values of PSNR unless MSE < peakValue^2, you must have A and ref on different scales, like you called im2double on one but not the other.
  2 个评论
Image Analyst
Image Analyst 2016-5-19
Yes, but im2double() scaled the data to between 0 and 1. Did you also do that for A? I'm thinking not otherwise the SNR would not be negative.

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