Hi everyone As part of this year's GSoC, Vighnesh is working on a graph region representation. He made several test implementations so far, outlined here: http://vcansimplify.wordpress.com/2014/06/04/gsoc-graph-data-structures-comp... If you are interested in following along, please join us on the skimage-gsoc group [0]. Stéfan [0] https://groups.google.com/group/skimage-gsoc