Getting rid of combing in a progressive clip

[ZetaStax]

The title might be a little misleading, but it's difficult to put the problem in few words. I am working with a PAL DVD who has progressive video stored interlaced, so no deinterlacing nor field matching required. However there is one scene that displays combing artifacts, but not due to interlaced video. It's a scene that was obviously shot on green screen, and I believe the video was not deinterlaced correctly during post-production. You can see the combing in the following frame.


[Attachment 49480 - Click to enlarge]

Is there any algorithm that can help me clean-up this scene? I've tried TFM, and QTGMC (with InputType=1 and InputType=2) without any success. Thank you.

[davexnet]

Vinverse() ?

[ZetaStax]

Vinverse() ?

Didn't know about this plugin. Tried it, but it had no visible effect.

[manono]

Vinverse should have done the trick if - IF - it hasn't been resized improperly somewhere along the way.

If you bob it with Yadif(Mode=1) or QTGMC and still see the interlacing, then it's already been resized and your choices become severely limited.

If bobbing it gets rid of the interlacing, then you might try:

QTGMC(FPSDivisor=2)

for just that section alone.

[hello_hello]

If it's been resized and it's interlaced and QTGMC doesn't do a good job, try blend de-interlacing instead.

Something like TDeint(Type=4) or even TFM(pp=2)

[ZetaStax]

Yes... it seems the clip was resized incorrectly. The combing artifacts are 2 px high. None of the proposed solutions work sadly. The only idea I have would be to select only half the lines and apply some deinterlacing on that... even though the resolution will suffer massively. Is that even possible?

[jagabo]

You'll have to upload a video sample (don't reencode).

[manono]

Yes, you bob it followed by SelectEven or SelectOdd, depending on which looks better, and deinterlace it only for that section. But I doubt it'll work.

hello_hello has one solution, although nothing will make it look good again. You could also try downsizing that section followed by upsizing it again.

[ZetaStax]

Here's a sample https://mega.nz/#!xwZwhIbR!aCcPCp2lSOFAjlv8xuzyikO4JTRiAqOOLZHqQp6zqoU

I will try resizing, but my best bet is probably to just leave it as is.

[jagabo]

This gets rid of most of it:

SeparateFields()
vInverse()
Weave()

Following with a temporal denoiser can get rid of the rest. To be safe I'd use the procedure only on the problematic shots.

[ZetaStax]

This gets rid of most of it:

SeparateFields()
vInverse()
Weave()

Following with a temporal denoiser can get rid of the rest. To be safe I'd use the procedure only on the problematic shots.

Yes, that's not too bad actually! Thanks.