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. Author manuscript; available in PMC: 2018 Apr 20.
Published in final edited form as: J Phys Chem B. 2017 Mar 2;121(15):3747–3756. doi: 10.1021/acs.jpcb.6b10732

Figure 1.

Figure 1

Density Map Segmentation. A. Binary maps, generated by application of a threshold to the density map (central Z-axis slice shown); threshold = 0 (left) is appropriate while threshold = 0.5 (right) is unsuited for segmentation. B. Distance Transform (DT) of the complementary binary map ~Mbin (central Z-axis slice shown). C. Same map as in (B) but showing central X-axis slice (top) and Y-axis slice (bottom). D. Inverted distance transform map DT ≔ − DT. E. Same map as in (D) but showing central X-axis slice (top) and Y-axis slice (bottom). F. Distance Transform map with voxels corresponding to the background voxels of Mbin, labeled as −infinity, so that the background voxels becomes inaccessible. G. Same map as in (F) but showing central X-axis slice (top) and Y-axis slice (bottom). H. Segmentation of the volume maps after applying the Watershed Transform with region merging. I. Same map as in (F) but showing central X-axis slice (top) and Y-axis slice (bottom).