[FFmpeg-trac] #11019(avfilter:new): Full-Image Averaging (Favg) denoise

[FFmpeg]

#11019: Full-Image Averaging (Favg) denoise
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             Reporter:               |                    Owner:  (none)
  MasterQuestionable                 |
                 Type:  enhancement  |                   Status:  new
             Priority:  important    |                Component:  avfilter
              Version:  unspecified  |               Resolution:
             Keywords:  denoise      |               Blocked By:
  nlmeans                            |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by MasterQuestionable):

 ͏    Another interesting property of the algorithm seems to be
 idempotence:
 ͏    I.e. repeatedly applying which with equal or less strength seems to
 keep output identical.

 ͏    E.g.
 ͏    19, 20 * n, 25, 30 * n
 ͏    ; where " * n" means countless many.
 ͏    .
 ͏    Possible outcomes:
 ͏    (given threshold of 5)
 ͏    |1| ~ 20 * n, ~ 30 * n
 ͏    |2| ~ 20 * n, 30 * n
 ͏    |3| 19, ~ 25 * n

 ͏    Making which a perfect substitute of JPEG alike compression schemes.
 ͏    (no further re-encoding loss)
 \\
 \\
 ͏    Per above observation, it's likely also beneficial to make the
 averaging process:
 ͏    Start from the most frequently appearing values (per
 component/channel).

 ͏    Such shall give more reasonable averaging outcome.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11019#comment:4>
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