21 Topological characteristic of points in 3D For a 3D (26, 6) digital image a point p is: An interior point Tb(p) = 0 A isolated pointT(p) = 0 A border point T(p) = 1 and Tb(p) = 1 A curve pointT(p) = 2 and Tb(p) = 1 A curves junctionT(p) > 2 and Tb(p) = 1 A surface pointT(p) = 1 and Tb(p) = 2 A surface-curve(s) junctionT(p) 2and Tb(p) = 1 A surfaces junctionT(p) = 1 and Tb(p) > 2 A surfaces-curve(s) junctionT(p) 2and Tb(p) > 2 Junction between curves curve Border points Junction between surfaces surface Junction curve-surface [Malan 10]
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