how can i get the PSNR for an multibanded image?

Hi, I have an image which is [307,280,191] and i added some noise to it and i want to get the PSNR between the 2 images (original and noisy)

Thanks

Answer 1

[Youssef Khmou]

hi,

Take a look at my submission : http://www.mathworks.com/matlabcentral/fileexchange/37691-psnr-for-rgb-images

In the PDF file "PSNR_RGB.pdf" you will find how to implement the PSNR for 3D array .

 function y=PSNR_RGB(X,Y)

 % Y= PSNR_RGB(X,Y)
 % Computes the Peak Signal to Noise Ratio for two RGB images
 % Class input : double [0,1] ,
 % july ,25, 2012
 % KHMOU Youssef

 if size(X)~=size(Y)
    error('The images must have the same size');
 end

 %if ~isa(X,'double') 
 %   X=double(X)./255.00;
 %end
 %if  ~isa(Y,'double')
 %    Y=double(Y)./255.00;
 %end

 % begin
 d1=max(X(:));
 d2=max(Y(:));
 d=max(d1,d2);
 sigma=mean2((X-Y).^2);

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

Start testing with this function... BUT i think that this function works well , example :

 I=randn(100,100,100);
 J=I*0.9;
 PSNR_RGB(I,J);       %  76 Decibels
 J=imnoise(I,'Gaussian',0,0.6);
 PSNR_RGB(I,J);       % 30 Decibels

[Rawan hamdi]

Thank u so much but does this work for an image of size [280,307,191]?

[Youssef Khmou]

look at the example above, i think it works, otherwise try as i said to download the submission, the psnr for multidimensional array is explained .