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. Author manuscript; available in PMC: 2009 Oct 1.
Published in final edited form as: Med Image Anal. 2008 Jun 20;12(5):616–625. doi: 10.1016/j.media.2008.06.008

Fig. 2.

Fig. 2

Simple points for multiple objects: a) the central point can be exchanged between 2 and 4, but not 1 and 2 or 2 and 3 since these latter two cases would allow 1 and 3 to touch, b) the central point can swap from 1 to 3, but not 2 or 4, c) the central point is non-simple for any change if the objects are 6-connected, but can move from 3 to 2 if the objects are 26-connected (note that the groups 2–3 and 1–4 intersect each other in the latter case).