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xv
28th June 2010, 15:12
I got several DV sources that contain this chroma artifacts with yellow and blue spots. I attached an example, sometimes the spots are even more visible, thatīs average.
Is there any good method using VirtualDub and/or AviSynth filters to remove that artifacts?

2Bdecided
29th June 2010, 10:41
I think it's the remnants of the debayering in the camera itself. It becomes most visible in low light IME.

I've never managed to remove it satisfactorily - I tried taking a noise print in neat video, which in theory should target this quite well, but I needed stupidly high settings to get rid of it - by which time some genuine chroma details were also affected.

I'd be interested in a solution too.

I think this thread might be better in the AVIsynth forum - it's not necessarily DV specific (even though your source was DV).

Cheers,
David.

communist
29th June 2010, 20:23
FFT3DFilter on plane 3 (both chroma planes) with strong sigma values - I'm sure there are better ways but worked good enough for me yet :)
FFT3DFilter(sigma=25.0,plane=3)
or
FFT3DFilter(sigma=10,plane=3)

Wilbert
29th June 2010, 23:08
Try Cnr2 or GuavaComb.