"The Berkeley-Iowa Naked People Finder" describes one approach, which seems to first classify pixels as skin/not skin by color, then identifying "limbs" from th

"The Berkeley-Iowa Naked People Finder" describes one approach, which seems to first classify pixels as skin/not skin by color, then identifying "limbs" from the pixel regions. http://www.cs.hmc.edu/~fleck/naked.html http://www.cs.hmc.edu/~fleck/naked.html Some other people have worked on better skin classifiers: http://www.computer.org/portal/web/csdl/doi/10.1109/CVPR.1999.786951 http://www.computer.org/portal/web/csdl/doi/10.1109/CVPR.199... http://portal.acm.org/citation.cfm?id=1240564 http://portal.acm.org/citation.cfm?id=1240564 Looks like a hot topic. :)