[MEncoder-users] Noise reduction and interlacing: (hq)denoise3d vs. nr

[Pierre Catello]

2007/7/2, Ivo <ivop at euronet.nl>:

> IMHO tfields/tinterlace is prefered if you run a temporal denoiser. If you
> only (de)interleave as Nico suggested, the denoiser works with different
> data and will perform worse.
>
> For example: (F=frame, f=field)
>
> Input F1(f1,f2) F2(f3,f4) F3(f5,f6) etc...
>
> Fictional denoiser uses current frame, and the next two frames.
>
> If you use il=d and il=i:
>     F1 is denoised by using f1<-->f3<-->f5 and f2<-->f4<-->f6

IMHO, this is the right way, and I thought that
tfields=0,...,tinterlace was equivalent

> If you use tfields and tinterlace:
>     F1 is denoised by using f1<-->f2<-->f3 and f2<-->f3<-->f4

f1 and f2 or f2 and f3 do not belong to the same actual frame, so a
spatial filter will likely mess things if there is motion between F1
and F2.

P.