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19th June 2008, 01:32 | #1 | Link |
Registered User
Join Date: Jun 2007
Posts: 3
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selective denoising
Apologies for a couple of noob questions:
1. I've been trying to find a way to apply a denoise filter to only the U-channel in YUV, (or R-channel in RGB) leaving the other 2 channels alone. Please can anyone suggest a filter or method for achieving this ? So far I've only come across Luma/Chroma filters - I need to get inside the Chroma ... 2. I was also admiring the hue-selector in Tweak ... I wondered if there is something similar for RGB/YUV levels somewhere ? Any pointers much appreciated. :J |
19th June 2008, 15:57 | #6 | Link |
Registered User
Join Date: Aug 2005
Location: Asylum
Posts: 46
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You could use Cnr2:
"Cnr2 is a chroma temporal smoother (it wont touch luma), mainly aimed at tv/analogue captures. It is quite fast and very good at removing the typical chroma artifacts that can be present in captures." Download at: http://web.missouri.edu/~kes25c/cnr2_v261.zip
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20th June 2008, 05:03 | #7 | Link |
Derek Prestegard IRL
Join Date: Nov 2003
Location: Los Angeles
Posts: 5,988
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Yeah, for chroma noise it's hard to beat fft3dfilter. It's VERY good.
I usually start with plane=3, and sigma=2, then do UtoY or VtoY, and check for banding. If it's present, I either reduce global sigma, or roll-off strength - like sigma=2, sigma2=1.6, sigma3=1.2, sigma4=.8.. Now with Psy-RDO x264, I can follow with Gradfun2db, and dither away any remaining banding. ~MiSfit
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