MVDegrain5 to MDegrain5. Possible?

[Didée]

That's basically an Unsharp-Masking operation with very big radius, that does only +/-1 enhancement. It does affect all frequencies, both high and low. The HFs are not really a target at this point - they could be filtered out, but I sacrified that for speed and laziness. The intended effect merely is to enhance medium & low frequency features, so that a little more of them "survives" in difficult places.
It's also been used for the main MDegrain3 stage (2-fold, to achive a +/-2 enhancement), to get a little more deepness in the result.

[Vitaliy Gorbatenko]

Temporal part of fft3d filter very good!
fft3dGPU(bw=6, bh=6, ow=3, oh=3, bt=4, sigma=2, plane=4)
Don't have ghosts with sigma<=2. I'm think it better than use preprocessing with MC.

[Didée]

Yeah, fft3d makes a good universal weapon, that's nothing new.

However, when you're getting good results with just sigma=2, then you're probably dealing with: baby noise
;)

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In your scripts you used usually FFT3DFilter as denoiser to prefiltering. Why did you not ever use a temporal denoiser to prefiltering

a) Because FFT3DFilter is spatio-temporal.

b) Because FFT3DFilter is a good allrounder. Hence less danger people come whining "yoscriptdoesnogood4me".

It's all about "options". Sometimes [this] makes a better fit, sometimes [that], sometimes [sth else]. I'm mostly showing up options that can make sense to be used. Which is preferable when and why, that's a completely other ballgame.

(And same, that's why we usually get a purple face when newbies ask "which filter is DA BEST to use for ..." )

[SilaSurfer]

I'm all over it as soon as I catch some time, can't wait. Flux5FramesT's temporal threshold could be reduced for sources with lower temporal fluctuations? Well you can have "baby noise" but where compression used by the original encoder you can have high temporal fluctuations in that case Fft3dfilter(with higher sigma4 compared to other sigmas) would make sense in my opinion.

BTW
Nice hobby you got there.

[Vitaliy Gorbatenko]

And what do you do? There is a way to make quality time noise reduction without artifacts?

[SilaSurfer]

Well you cannot use temporal denoisers without the risk for artifacts like ghosting. Thats something that user needs to balance out, how much calming down you want at the expense of artifacts. But they do a better job IMHO for prefiltering then pure spatial ones.

[Vitaliy Gorbatenko]

You may not believe me but I know it. But it's better sometimes not completely filter out what to make of my artifacts in the video.