What does a negative PSNR value between am image and its filtered version indicate?

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Muhammad Ali

I suggest you follow https://au.mathworks.com/matlabcentral/answers/284335-negetive-valu-for-psnr-after-image-enhancment-in-matlab

https://www.researchgate.net/post/Can_anyone_explain_why_psnr_values_between_images_come_in_negative_values_and_snr_are_positive

Sushma T.V.

Thank you Muhammad.So it means PSNR cannot be negative. But I am not able to figure out why I am getting negative. Will check out.Thank you..

Abbas Cheddad

PSNR cannot be negative, probably you are calculating the correlation?