PSNR vs SNR in image Processing

Hello, What is difference between PSNR and SNR in image processing? Thanks

[Dani D]

No anyone here?

Answer 1

[Image Analyst]

SNR is the signal to noise ratio. PSNR is probably a bad name since it's not necessarily comparing the signal to the noise. It really compares one image to another. It's main use had been in comparing reconstructed images from an image that has undergone a roundtrip compression and decompression. It is a measure of how bad the compression artifacts are. There is a function psnr() in the Image Processing Toolbox.

Answer 2

[John BG]

Hi Dani

MAXi is the maximum possible pixel value, 2^B-1 where B is the amount of bit used to quantize.

Wikipedia has some useful links you may want to have a look at:

https://en.wikipedia.org/wiki/Peak_signal-to-noise_ratio

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thanks in advance

John

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