Mean-shift for image segmentation
Useful to take into account spatial information
•instead of (R, G, B), run in (R, G, B, x, y) space
•D. Comaniciu, P. Meer, Mean shift analysis and applications, 7th International Conference on Computer Vision, Kerkyra, Greece, September 1999, 1197-1203.
–http://www.caip.rutgers.edu/riul/research/papers/pdf/spatmsft.pdf 
More Examples:  http://www.caip.rutgers.edu/~comanici/segm_images.html