Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion. Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules. |
27th June 2016, 14:03 | #1 | Link |
Registered User
Join Date: Mar 2013
Posts: 18
|
Post Yadif deinterlacing artifacts fixing
I got video that has been (unfortunately) deinterlaced with yadif only. So now on contours I have white dots. Does anyone know how they can be removed? This is the first time I'm working on already processed video with yadif so I don't know what can be done here.
6 second long sample. (look at hand) |
27th June 2016, 14:45 | #2 | Link |
Formerly davidh*****
Join Date: Jan 2004
Posts: 2,496
|
This seems a strange one to me. It's 720p. 720i isn't really a thing, so I would normally assume it came from 1080i, was deinterlaced and then resized.
But all the "good" lines (alternating rows) seem to be intact. And what's more, they are the same rows on subsequent frames, not alternating. I don't know how this came to be. Anyway, I would suggest: Code:
nnedi3(field=0) It gets rid of the dots and makes a better job of interpolating the lines. |
27th June 2016, 15:33 | #3 | Link | |
Guest
Posts: n/a
|
Quote:
Anyway, I echo the sentiments for nnedi3. If not, you could use QTGMC(InputType=2,ProgSADMask=2) but expect it to go slower than you'd like. I'd also recommend doing any decimation prior to these steps. It looks like the footage should be played back at 23.976fps. |
|
27th June 2016, 16:39 | #4 | Link | |
Registered User
Join Date: Mar 2013
Posts: 18
|
Thanks for response. Both of your suggestions are working. In some scenes better is nnedi3 and in other QTGMC. I will look a bit longer which plugin gives better overall results and choose one. Or maybe I will choose both at once? :P
Quote:
Edit: I better don't use both. Nnedi3 gives better overall results so I will stick with him. Thanks for help. Last edited by kostek00; 27th June 2016 at 16:59. |
|
27th June 2016, 19:47 | #5 | Link |
Registered User
Join Date: Dec 2015
Posts: 59
|
I hope one day someone will speed up post-yadif processing.
I believe it can be done with a superfast local motion-detector that only uses a window 4*4 or 4*8(horizontal) and seeks only 1 line up and 1 down. Then, it makes its guess and moves the block up half a line, and in the next frame, down the same amount (or vice versa). For these resulting blocks, there is a weighted average computed through perhaps 3 frames. The mechanism triggers only when there is a "bobbing" artifact, or a typical "running ant" pattern, and blends itself off for every other part of the picture. This will already remove the biggest part of what is annoying in yadif. It is fast because it seeks only for a move up or down of the typical bobbing distance, and thus also transparent to other motion-techniques in the signal chain. |
Tags |
post-deinterlacing, yadif |
Thread Tools | Search this Thread |
Display Modes | |
|
|