Figure 3. Seed points chosen from candidate points in a 3D synthesized binary image stack.

The stack is volume-rendered with the color-map's alpha values of 0.2. The three touching cells are named TC₁, TC₂ and TC₃, and the light green points, Ĉ₁ and Ĉ₂, are the clustering centers of each class of concave points. (A) The reddish purple points are the 26 cubic neighbor points of the first CPCC point, Ĉ₁. (B) The red points are the seed points chosen from the reddish purple points from (A) under some restricted conditions. (C) The reddish purple points are the 26 cubic neighbor points of the second CPCC point, Ĉ₂. (D) The red points are seed points chosen from the reddish purple points of (C) under some restricted conditions. (E) The total seed points of (B) and (D). (F) The merge of all the seed points in (E) under some restricted conditions.