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PSNR for RGB images

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PSNR for RGB images

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01 Aug 2012 (Updated )

PSNR for 2 RGB signals, (Peak Signal to Noise Ratio ) evaluated in dB.

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Description

The function, PSNR_RGB( X,Y) computes the PSNR for two RGB images using the formula :
                    
MSE(X,Y)=SUM(1,n)SUM(1,m)SUM(1,p) [X(i,j,k)-Y(i,j,k)]²
                    
d= max(max(X),max(Y))|

PSNR(X,Y)=10.log( d.^2 / MSE)

with p=3, as three channels red, green and blue,

The code can be altered for gray scale image sequences , or Volume of pixels M(n,m,p) ( p > 3 ) .
 
Some results are in the pdf file " PSNR_RGB.pdf " for discussion .

Acknowledgements

Psnr and Tspsa inspired this file.

MATLAB release MATLAB 7.4 (R2007a)
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Comments and Ratings (2)
11 Jul 2014 vu

sorry log or log10?

20 Mar 2014 chen

??? Function 'log' is not defined for values of class 'uint8'.

add double
y=10*log(double(d.^2)./sigma);

Updates
28 Aug 2012

Screenshot added.

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