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Good afternoon. Tell me, what are the clearly defined mathematical algorithms of noise/distortion to the images? Come to mind only Gaussian noise and different types of blur (e.g. median filtering).
And not gayowski noise? The noise distortion is necessary to achieve a specific goal?

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additive noise with a given distribution law (including possibly dependent on neighboring pixels)of the multiplicative noise for a given law of distribution (including possibly dependent on neighboring pixels)the permutation of the pixels in a given region at a particular sahnovaalena distortion (as with calculations,and only at the expense of permutations)translation two-dimensional areas in the frequency region, applying the changes to it (additive, multiplicative noise is a special case of filtering treble, bass, flat), return to normal space

+ consistent integration of the above algorithms