Finding my way in the denoisers jungle...

[pcat]

Hi everyone,

I need to do some analog capture that require strong filtering (noisy sources). Usually, I use hqdn3d with low parameters when I need to clear out some noise (I know it is not the best, but it is simple to use and at least I understand what I do with it ;) ). However, in the current situation hqdn3d requires too high temporal values to clear the noise, which ghosts and blurs too much.

I read tons of posts here trying to survey the current "state of the art" in denoisers, but it isn't that easy for an casual user like me.

Given all the filters (fft3d, mvdegrain, removegrainmc, frfun, dctfun, ...)
and all the higher level scripts such as deen it is quite confusing.

I'm not asking which one is the best, but to narrow things a bit, for noisy interlaced content (high details, many edges, almost no static area except skies) showing strong chroma noise and a bit less luma noise, which kind of denoising approach would you recommend?

Thank you very much

[check]

are you sure you need the content to be interlaced? Denoising is significantly more effective when you can apply it to progressive frames, because spatial filtering is far more useful.

Is this content live action or cartoon? In either case, I'd recommend fft3dfilter as one contender.

[pcat]

are you sure you need the content to be interlaced? Denoising is significantly more effective when you can apply it to progressive frames, because spatial filtering is far more useful.


Yes, the content is natively interlaced (each field is shot at a different time). From what I understand, it is still possible to do spatial filtering by separating fields, applying spatial filter on each field, and then re-interlacing them into a single frame :

SeparateFields()
here goes processing for even field
here goes processing for odd field
Weave()



Is this content live action or cartoon? In either case, I'd recommend fft3dfilter as one contender.

It is live action (sport)

thanks for the suggestion for fft3d. How do you regard it in comparaison to RemoveGrainMC ?
- is the latter worth the hassle (and longer computing times) ?

Thanks

[foxyshadis]

DVB capture, or air/cable capture? If the latter, you should always start off with fanfilter/defreq and tcomb, if the former, a deblocker.

If you have a strong graphics card, fft3dgpu is very fast and effective. Otherwise, it's something you have to ask yourself, not us. :p We can suggest filters, only you can decide what's too slow for your purposes. Others you might look at are: frfun7, fluxsmooth, and vaguedenoiser, all of which have strengths but aren't as versatile as fft3d.

[pcat]

DVB capture, or air/cable capture? If the latter, you should always start off with fanfilter/defreq and tcomb, if the former, a deblocker.


They are old PAL vhs (masters were PAL Hi8 but I don't have them). I capture from a panasonic svhs deck feeding a canopus ADVC 110.


If you have a strong graphics card, fft3dgpu is very fast and effective. Otherwise, it's something you have to ask yourself, not us. :p We can suggest filters, only you can decide what's too slow for your purposes. Others you might look at are: frfun7, fluxsmooth, and vaguedenoiser, all of which have strengths but aren't as versatile as fft3d.

My graphic board an old nvidia 6600GT with 128 MB, don't know how much it can off load the cpu regarding fft3d, I will test that.

About the other filters you mention, it's a bit difficult to figure out what are their specific strengths or to which situation they best fit, at least for non expert users like me. It is the very reason why I settled so long for hqdn3d.
Just to make things even more simple ;), some people even recommend using a combination of filters for them to work best, or two separate pass with differents parameters.

I have found a comprehensive review of denoisers here:
http://www.yuvsoft.com/pdf/Video_Denoiser_Comparison.pdf

but it does not address avisynth filters...

[adoniscik]

I too have a 6600GT with 128MB and I find fft3dgpu very fast and effective. You might be in for a pleasant surprise!