6. Noise filtering
All the above applies to both the useful signal and the noise, but it is the search for improved signal perception that has been the main motivation. Noise is also filtered, but its perception can nonetheless be enhanced, as mentioned above.
6.1 Anscombe transform
Let's focus on the case of an image whose noise is of quantum origin (electronic noise is neglected, which is legitimate most of the time): if N represents the signal per pixel (in number of primary quanta absorbed),
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Noise filtering
Addition and multiplication of images
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