What method should I use to deinterlace this file?

[Filipon]

Good morning,

I find myself facing a problem correctly deinterlacing a video in Megui. I tried to have the video analyzed by Megui or my usual deinterlacing methods (notably Tdeint) but nothing helps, each time, I end up with ghost images and when I analyze the frames, we see that there is a sort of aliasing in each deinterlaced frame (see image below).

- https://i.imgur.com/rsWlwqo.png

Could anyone suggest the best way to do this?
I am attaching a short extract.

Thanks.

[jagabo]

It's telecined film that has been blend deinterlaced. You can fix it with a filter like ExBlend() in AviSynth.

LWLibavVideoSource("VTS_01_1.VOB") 

ExBlend(mode=0, pal=0, show=0) # unblend the blended frames
vInverse() # reduce residual combing (from compression artifacts)
TDecimate() # reduce 1 duplicate out of every 5 frames, restore original 23.976 film frame rate

SMDegrain(thsad=500, tr=2, PreFilter=4) # general noise reduction

[Alwyn]

Marvellous.

[Filipon]

Thank you for your help Jagabo, however, I notice there are still ghost images after your treatment, I guess there is nothing we can do to remove them?

Moreover, I noticed that there are sometimes artifacts that appear from time to time, always in frames that have been deinterlaced.

- https://i.imgur.com/nkhO1QU.png

But apart from that, I am very happy with the script that you offered me and I thank you again.

[lordsmurf]

Sometimes the goal of restoration (what you have here, starting with damaged video) is to make it better, not make it perfect. Try for perfection, just be willing to accept limitations (ie, don't make "better not perfect" an excuse to accept crap).

Jagabo is an Avisynth wiz.

[jagabo]

Thank you for your help Jagabo, however, I notice there are still ghost images after your treatment

Those problems are from compression artifacts in the source. The artifacts make in impossible to fully restore the frame original film frame.

I guess there is nothing we can do to remove them?

That's why I used the strong temporal noise reduction of SMDegrain. It cleans up most of those artifacts (as well as the other noise). Here's the same frame, before and after SMDegrain:


[Attachment 76057 - Click to enlarge]

[Selur]

Instead of SMDegrain using Vapoursynth with BasicVSR++ or some of the models that can be used through avs/vs-mlrt probably can clean up the source better adding some line darking would also help. (attached an example where I used BasicVSR++ adn some line darkening on jagabo firs output)
(sadly, there is no Exblend alternative for Vapoursynth )

Cu Selur