?? psnr.m
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function p = psnr(x,y, vmax)
% psnr - compute the Peack Signal to Noise Ratio, defined by :
% PSNR(x,y) = 10*log10( max(max(x),max(y))^2 / |x-y|^2 ).
%
% p = psnr(x,y);
%
% Copyright (c) 2004 Gabriel Peyr
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