NeatVideo noise reduction plugin (not freeware)
Do you know the NeatImage app that does noise reduction by spectral subtraction (you make a "noise profile" for selectively removing the noise, like the audio noise reduction in CoolEdit/Audition)?
Now there's a NeatVideo software that uses the same technique. There's a limited demo (Virtualdub plugin) at http://www.neatvideo.com/index.html I wonder if it's as slow as the original NeatImage :) |
Re: NeatVideo noise reduction plugin (not freeware)
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If you're interested in stuff like this for Avisynth, FFT3DFilter has the parameters for x and y to choose the noise pattern manually from the video frame. I don't know how effective it is though.
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I tried it with the 3 seconds test avi from the site. It is SLOW. It really kills the noise. The details... well, some are kept intact some are blurred. Watching the cleaned clip, I noticed that the blurred parts are kind of "moving" like the moving backgrounds in some avi codecs. It seems it is only a spatial denoiser, no temporal denoising (well that would make it even slower :)).
My first impression is that it's not a denoiser for everyday use like backing up clean dvds or reasonably clean captures, but it can be handy if you've got a very problematic capture of something important enough to make the time you'll expend worth. Thanks Boulder, I'll look at the FFT3D filter. Does it have a way to automatically build the noise "profile"? Does the 3D in the name imply it filters in the time axis too? |
You can select the coordinates of the area where the filter will estimate the noise from. It needs to be a flat colored one (like a wall etc.) for it to work properly.
FFT3DFilter can be used as a spatial or a spatio-temporal filter. I recommend using bt=3 which uses the previous, the current and the next frame for analysis. I've noticed that FFT3DFilter is particularly effective against chroma noise :) If you have a decent video card, FFT3DGPU is one that you should try although I think that the noise profile thingie isn't implemented. It's a lot faster than FFT3DFilter. |
Thanks. I think I'll try running FFT3D on the neat video test.avi to see how they compare :)
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I've tested the FFT3DFilter with the "noise pattern" option. First, it did a very good job. It was lightning fast compared to NeatVideo :) It removed lots of noise without wiping to much details. But, even with psfactor=1.0 it was much more "gentle" than NeatVideo's most agressive setting. I'll post some snapshots.
BTW I was wrong, Neatvideo does temporal filtering too, you can configure how many frames. |
@GFR
Hi there! I'm very interested in your results (screenshots) and settings (AVS script) as well. I also tested NeatVideo VD plugin out and it's really slow (but the MCRN by Didée is much more than it :? ). Cheers, |
Original (SampleClip.avi from NeatVideo):
http://www.digitalfaq.com/archives/i.../2006/02/1.png FFT3DFilter (using "pattern mode" with psfactor=1.0, wintype=2,px=2,py=2) http://www.digitalfaq.com/archives/i.../2006/02/2.png NeatVideo (auto profile, remove all noise) http://www.digitalfaq.com/archives/error.gif |
Not on topic, but have you tried motion compensated denoising?
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Not yet.
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