how to calculate PSNR value ?

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

[Wayne King]

Can you say if you're using a lifting transform, why the reconstructed image approximation is not 512x512?

[Sivakrishna]

if the source image is m*n

then the super resolution reconstructed image is 2m-1*2n-1

Answer 1

[Image Analyst]

What if you just used imresize() on one of them? And then did the usual PSRN formula. Would that work for your purposes?

[Sivakrishna]

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]

Make your reference image bigger to match the size of your super resolution image.

Answer 2

[sandra viaña borja]

Sivakrishna Did you find how to calculate PSNR between an original image and the super resolution constructed one?

[Image Analyst]

After 6 years, I imagine so. But since then, lucky for you, they've introduced the psnr() function into the Image Processing Toolbox so you can just simply use that, after using imresize() of course to make the image sizes match.

[Anu Sri]

hey can anyone suggest me how to find the psnr value for RGB image?

[Image Analyst]

Try this:

p = psnr(rgbImage, refImage);

[Anu Sri]

it worked,thankyou!!