Use mean as denoiser #57
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Reference: Benjamin_Loison/Robust_image_source_identification_on_modern_smartphones#57
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RAISE flat field:
Modified brightness and contrast:
Being able to explain why this method leads to an estimated PRNU with more color gradients as the original image.
Current issue is that in theory extracting noise by substracting the average image removes the PRNU, but as shown above we still observe patterns looking like unique artifacts. To avoid removing the PRNU as the image are quite smooth enough we will apply a Gaussian kernel to blur the image to remove the PRNU from the average image.
The good question is what
sigmavalue is appropriate? Once will have mathematical metrics could benchmark.Does not seem as precise as bilateral denoiser.
Mean denoiser:
Bilateral denoiser:
Source: issues/49#issuecomment-1693