#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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