PSNR vs SNR in image Processing

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Dani D
Dani D 2016-4-8
回答： John BG 2016-4-11
Hello, What is difference between PSNR and SNR in image processing? Thanks

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回答（2 个）

Image Analyst
Image Analyst 2016-4-10
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.
John BG
John BG 2016-4-11
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
If you find this answer of any help solving your question, please click on the thumbs-up vote link,
thanks in advance
John
jgb2012@sky.com

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