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Recently I found "Conditional Temporal Median Filter".
Greate works! Thanks to Kevin Atkinson.
I tred to use it for my archive of old 8 mm kino-films (telecined with camcorder and tv-tuner).
These movies have many spots and scratches.
Before I tried similar filters for VirtualDub: "SpotRemover", "Pops", and "Random Noise Remover".
But CTmedian is the most advanced, it makes less artefactes (false detections) on moving parts. Also it removes spots more purely, completely (with outliers).
However, I have one question (proposition).
In many my (and similar) movies, almost all spots are black (from dust).
Sometimes, the CTmedian filter make false detections at transition from dark to light pixels.
Rarely, it transfers a dark spot from previous frame to current!
In contrast, there are another movies, captured from analog TV, with only white spots (snow).
I think, this filter would produce still less artefacts on similar movies, if it makes comparing of pixels not by absolute difference, but simple difference (as option).
For example, some new option may control filter's work as follows:
- detect and clear all transitions (default),
- detect and clear only black spots,
- detect and clear only white spots.
Is it possible in next version of the filter?
By the way, the POPS filter has similar control (tuned black and white spot detection levels).
P.S. I am not a real C-programmer.
P.P.S. Sorry my English.
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