Rough Set Based Color Channel Selection
  Color channel selection is essential for accurate segmentation of sky and clouds in images obtained from ground-based sky cameras. Most prior works in cloud segmentation use threshold based methods on color channels selected in an ad-hoc manner. In this letter, we propose the use of rough sets for color channel selection in visible-light images. Our proposed approach assesses color channels with respect to their contribution for segmentation, and identifies the most effective ones. 
Soumyabrata Dev, Florian M. Savoy, Yee Hui Lee, Stefan Winkler
cs.CV