How does BM3D denoise color pictures?

[liu-yichang]

[pjsss]

http://www.ipol.im/pub/art/2012/l-bm3d/ Adapting the algorithm to color images is easy and can be done in the following steps:

1. First a transformation to a luminance-chrominance space from the RGB noisy image is applied. Y denotes the luminance channel and by U and V the chrominance channels;

2. For each step: 

Grouping is only performed with the Y channel; 

The 3D block built on Y is used for all three channels; 

Collaborative filtering is applied to each channel separately as well as the weighted aggregation.

3. Return to the RGB space by applying the inverse transformation.