So, my question is pretty much the same as Adams. The paper/algorithm they use for segmentation can be found at http://ieeexplore.ieee.org/iel1/34/11961/0...6258&isnumber=11961 . and is interesting in and of itself. It seems to be like a watershed but with some notion of forces (I only halfheartedly read it unfortunately so I don't know too much about it). It seems more invariant because it basically does a multiscale method with intensity relativeness (per scale per region). That should provide both decent illumination and scale invariance. Any chance we could get a tiny little comparison between this and either the advanced segmentation paper we touched or a simple algorithm like watershedding?