how to calculate PSNR value ?

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Sivakrishna
Sivakrishna on 23 Sep 2012
Commented: Anu Sri on 28 Sep 2018
hi
i need help for calculating PSNR value for two different size images
original image = 256 * 256
output image = 511 * 511
can anyone suggest how to calculate PSNR value for above images
  2 Comments
Wayne King
Wayne King on 23 Sep 2012
Can you say if you're using a lifting transform, why the reconstructed image approximation is not 512x512?
Sivakrishna
Sivakrishna on 23 Sep 2012
if the source image is m*n
then the super resolution reconstructed image is 2m-1*2n-1

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Answers (2)

Image Analyst
Image Analyst on 23 Sep 2012
What if you just used imresize() on one of them? And then did the usual PSRN formula. Would that work for your purposes?
  2 Comments
Sivakrishna
Sivakrishna on 23 Sep 2012
Edited: Sivakrishna on 23 Sep 2012
hi image analyst,
if i resize the image i will lost reconstructed image information?
suggest better way to find PSNR values for above images
Image Analyst
Image Analyst on 23 Sep 2012
Make your reference image bigger to match the size of your super resolution image.

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sandra viaña borja
sandra viaña borja on 8 Jul 2018
Edited: Image Analyst on 9 Jul 2018
Sivakrishna Did you find how to calculate PSNR between an original image and the super resolution constructed one?
  4 Comments
Image Analyst
Image Analyst on 28 Sep 2018
Try this:
p = psnr(rgbImage, refImage);
Anu  Sri
Anu Sri on 28 Sep 2018
it worked,thankyou!!

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