?? psnr.m.svn-base
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function p = psnr(x,y, vmax)
% psnr - compute the Peack Signal to Noise Ratio
%
% p = psnr(x,y,vmax);
%
% defined by :
% p = 10*log10( vmax^2 / |x-y|^2 )
% |x-y|^2 = mean( (x(:)-y(:)).^2 )
% if vmax is ommited, then
% vmax = max(max(x(:)),max(y(:)))
%
% Copyright (c) 2004 Gabriel Peyre
if nargin<3
m1 = max( abs(x(:)) );
m2 = max( abs(y(:)) );
vmax = max(m1,m2);
end
d = mean( (x(:)-y(:)).^2 );
p = 10*log10( vmax^2/d );
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