Neat Video community Forum Index
www.neatvideo.com
Neat Video community
support - help - questions and answers - sharing experience and opinions - feedback - suggestions - backup contact
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Flickering / unstable filtration

 
Post new topic   Reply to topic    Neat Video community Forum Index -> Bugs, issues
View previous topic :: View next topic  
Author Message
VHSobsessive



Joined: 31 Aug 2011
Posts: 16

PostPosted: Wed Jun 03, 2015 3:27 am    Post subject: Flickering / unstable filtration Reply with quote

There is a filtration issue I cannot get rid of in NV3 (and the NV4 demo). It involves areas of the image which lack texture or defined edges, e.g. out of focus background areas.

The temporal filter seems unable to realise that these background areas are entirely static, even with a temporal radius of 5, and increased threshold. I usually have the spatial filter switched off ... it does not help this issue when switched on.

Virtualdub, Win7-64.



Here is an XVID showing the problem (NV4, temp radius 2, thresh. max, spatial filter off] :

https://www.dropbox.com/s/dgvw3aifn3qt53j/PROBLEMCLIPS%20WITH%20NOISE%20FRAMES%20NV4%20SHORT%20XVID%20GOP1%20Q1.43.avi?dl=0

Clip 1 : upper left background; clip 2 : lower left wall; clip 3 : centre-right wall spotlight; clip 4 : centre-right yellow jacket reflection.

And a high-bitrate MJPEG of the unfiltered problem clips ... I have added a few extra frames to help profile building [click download, top right] :

https://www.dropbox.com/s/mldieiktonmtgl3/PROBLEMCLIPS%20WITH%20NOISE%20FRAMES%20MJPEG%20Q93.avi?dl=0

I don't think the profile is very relevant but here is what I have been using :

https://www.dropbox.com/s/d2kdd5jw0a3yntd/clip%20profile%20.dnp?dl=0

Are you able to reproduce this, and have you any suggestions on how to resolve this ?

Thank you for this otherwise excellent filter.
Back to top
View user's profile Send private message
NVTeam



Joined: 01 Sep 2005
Posts: 2237

PostPosted: Wed Jun 03, 2015 1:18 pm    Post subject: Reply with quote

Yes, I can see that flickering. It is not unstable filtration, the flickering is present in the original frames as well. Removing the noise just makes that flickering more visible.

Unfortunately, we do not currently have any dedicated means to address that specific problem of the source clip. That may be one of the directions of our future development.

Thank you,
Vlad
_________________
Neat Video team
noise reduction for video and photos
Back to top
View user's profile Send private message Visit poster's website
VHSobsessive



Joined: 31 Aug 2011
Posts: 16

PostPosted: Wed Jun 03, 2015 5:07 pm    Post subject: Reply with quote

Thank you. Please consider it. NV2 deals with these difficult areas perfectly. Hopefully something can be done.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Neat Video community Forum Index -> Bugs, issues All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group