Four-Color Theorem and Level Set Methods for Watershed Segmentation.

Erlend Hodneland Xue-Cheng Tai Hans-Hermann Gerdes Four-Color Theorem and Level Set Methods for Watershed Segmentation. 264-283 2009 82 International Journal of Computer Vision 3 http://dx.doi.org/10.1007/s11263-008-0199-4 db/journals/ijcv/ijcv82.html#HodnelandTG09