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.

 

Go Back   Doom9's Forum > Capturing and Editing Video > VapourSynth

Reply
 
Thread Tools Search this Thread Display Modes
Old 22nd May 2020, 15:51   #1  |  Link
ACKR
Registered User
 
Join Date: Apr 2020
Posts: 42
Why is it recommended to denoise the luma plane only?

I have a bunch of anime blu rays i want to encode and all the guides say to only denoise the luma plane(Y) why is it? Should other frames be left as is?
ACKR is offline   Reply With Quote
Old 22nd May 2020, 17:56   #2  |  Link
amichaelt
Registered User
 
Join Date: Apr 2018
Posts: 95
Quote:
Originally Posted by ACKR View Post
I have a bunch of anime blu rays i want to encode and all the guides say to only denoise the luma plane(Y) why is it? Should other frames be left as is?
Why not ask the people writing the guides? Maybe it's for some sort of slight speed gain? What do these guides you are reading say specifically?

Last edited by amichaelt; 22nd May 2020 at 17:59.
amichaelt is offline   Reply With Quote
Old 22nd May 2020, 18:08   #3  |  Link
lansing
Registered User
 
Join Date: Sep 2006
Posts: 1,275
Usually you're not going to see any visual difference when denoising Cr and Cb plane unless there's a color noise.
lansing is offline   Reply With Quote
Old 22nd May 2020, 20:38   #4  |  Link
MysteryX
Soul Architect
 
MysteryX's Avatar
 
Join Date: Apr 2014
Posts: 2,208
There's the fact that in the standard YV12 format, there is 1 chroma pixel for every 4 lima pixels. The information is much more grossian and thus much less noise. It would in fact just blur it out further?
MysteryX is offline   Reply With Quote
Old 28th May 2020, 01:45   #5  |  Link
Asmodian
Registered User
 
Join Date: Feb 2002
Location: San Jose, California
Posts: 3,928
Quote:
Originally Posted by MysteryX View Post
The information is much more grossian and thus much less noise. It would in fact just blur it out further?
I think this is the most significant reason.

(You meant Gaussian I assume? It is not really Gaussian, that is a particular shape, but that is getting pedantic; you meant it is smooth and low detail, like video after a gaussian blur, which is true).

Then even if there is some noise humans are bad at noticing chroma noise.

Also performance considerations, all the above is true and then on top of that it takes a lot of CPU time to work on. All in all it is almost never worth it but weird sources always exist. For example, if over compressed there can be compression artifacts in the chroma planes, these are usually better handled by deblocking the chroma not denoising it, but there can still be reasons to do it.
__________________
madVR options explained
Asmodian is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 14:58.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.