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-   -   VirtualDub: NeatVideo noise reduction plugin (not freeware) (http://www.digitalfaq.com/archives/encode/14115-virtualdub-neatvideo-noise.html)

GFR 02-09-2006 10:24 AM

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 :)

Dialhot 02-09-2006 11:15 AM

Re: NeatVideo noise reduction plugin (not freeware)
 
Quote:

Originally Posted by GFR
I wonder if it's as slow as the original NeatImage :)

:rotf:

Boulder 02-10-2006 03:50 AM

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.

GFR 02-10-2006 05:54 AM

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?

Boulder 02-10-2006 06:13 AM

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.

GFR 02-13-2006 05:43 AM

Thanks. I think I'll try running FFT3D on the neat video test.avi to see how they compare :)

GFR 02-14-2006 06:01 AM

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.

danpos 02-14-2006 06:39 AM

@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,

GFR 02-16-2006 11:36 AM

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

Boulder 02-16-2006 11:46 AM

Not on topic, but have you tried motion compensated denoising?

GFR 02-17-2006 05:41 AM

Not yet.


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