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answered 2013-08-14 17:13:54 -0600
grabcut: http://docs.opencv.org/modules/imgproc/doc/miscellaneous_transformations.html?highlight=watershed#grabcut.
meanshift: http://docs.opencv.org/modules/imgproc/doc/filtering.html?highlight=pyrmeanshift#pyrmeanshiftfiltering
updated 2013-08-14 17:14:53 -0600
Btw: A small search in this forum could have given you exactly this answer...