psnr

PURPOSE ^

Takes two 8-bit IMAGES and computes peak-to-peak signal to noise ratio:

SYNOPSIS ^

function [gamma] = psnr(x,y)

DESCRIPTION ^

 Takes two 8-bit IMAGES and computes peak-to-peak signal to noise ratio:
 gamma = 10 log (255^2/MSE)
 x and y must be the same dimension and may be 2D arrays or vectors.

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 
0002 % Takes two 8-bit IMAGES and computes peak-to-peak signal to noise ratio:
0003 % gamma = 10 log (255^2/MSE)
0004 % x and y must be the same dimension and may be 2D arrays or vectors.
0005 
0006 function [gamma] = psnr(x,y)
0007 
0008 x = double(x);
0009 y = double(y);
0010 
0011 sx = size(x);
0012 sy = size(y);
0013 
0014 if sx == sy
0015    dd = x(:) - y(:);
0016    gg = (dd' * dd)/prod(sx);
0017    if (gg==0)
0018       gamma = Inf;
0019    else
0020       rr = 255^2./gg;
0021       gamma = 10 * log10(rr);
0022    end
0023 else
0024    fprintf ('\n Input image dimensions not consistent.');
0025    gamma = NaN;
0026 end

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