PSNR bsed comparisson of images

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Mangesh
Mangesh 2015-2-4
评论： Mangesh 2015-2-5
Sir, I have 4 images A,B,C,D and I have to compare image A using psnr, with respect to A,B,C and D. please suggest the code

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Image Analyst
Image Analyst 2015-2-4
There is a function psnr() in the Image Processing Toolbox. If you don't have that, you can do it manually yourself. See my attached program.
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Image Analyst
Image Analyst 2015-2-4
Why would there be an if/else block??? What would you be testing/checking/comparing in the if statement? Anyway I'm sure (or at least I'd like to think) that you know how to use an if/else statement
if someExpression
% Do something such as call psnr
elseif someOtherExpression
% Do something else
else
% When all else fails, do this
end
Mangesh
Mangesh 2015-2-5
Sir I have four images with same color but different contrast,with respective psnr values. Now I have to compare A with rest of the three that in how much percent it matches with rest of three.......please help

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