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cszn / FFDNet

FFDNet: Toward a Fast and Flexible Solution for CNN based Image Denoising (TIP, 2018)
https://ieeexplore.ieee.org/abstract/document/8365806/
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Elements in noise level map #24

Closed JacksonZyy closed 4 years ago

JacksonZyy commented 4 years ago

Hi,

For AWGN images, you mention in the paper that the noise level map should take uniform element \sigma. May I know why the noise level map is set in this way for AWGN? And is it ok to denoise AWGN image with non-uniform noise level map?

Thanks, Yuyi

cszn commented 4 years ago

Absolutely, non-uniform noise level map is a better choice. You may read the paper again.

JacksonZyy commented 4 years ago

Absolutely, non-uniform noise level map is a better choice. You may read the paper again.

Hi,

Thanks for replying. It is indeed mentioned in the paper that a non-uniform map is used for spatially VARIANT noise. But if non-uniform map is always the best choice like you said, why don't you use it also for spatially INVARIANT noise like AWGN?

Thanks, Yuyi

cszn commented 4 years ago

I mean non-uniform noise level map is a better choice for images with real AWGN.