Hi all,
I just couldn't wait any longer for the release of MJPEG Tools 0.7, so I finally decided to take the jump to the latest CVS version. Most of my shell scripts were still working perfectly, except for the denoising part.
I use MJPEG Tools to process my digital video camera recordings and translate them to MPEG2 streams. Especially in low light conditions (like inside my home) there is a *lot* of chroma noise in the recordings: On a 100% grey background you can see small patches of slightly red colored pixels that appear at random and never last longer than 1 frame. Especially in the shadows, the red colors are jumping up and down like crazy. Previously, I used 'yuvdenoise -f' in the processing pipeline, which did a very good job removing almost all of this noise without destroying details.
Although the -f switch of yuvdenoise is still documented as valid in CVS, it seems to be depricated. So, I tried using 'yuvdenoise -t 1' but it acted like a digital sledgehammer: The picture looks 100% noise free and blurry. Even 'yuvdenoise -t 0' is far, far too agressive.
So, I decided to try the new y4mdenoise. This utility did not seem to have a subtle bit noise remover either. I tried 'y4mdenoise -t 2 -T 6 -z 1 -Z 5' which seems to come close to what 'yuvdenoise -f' could do. These settings are quite agressive, but less agressive settings fail to remove the chroma noise.
What is the best way to attack this kind of noise in current CVS, and is there any good replacement for 'yuvdenoise -f' ?
Cheers,
Dik
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