Feature Extraction from 3D Point Cloud Data Based on Discrete Curves

Figure 25

Extracting the discontinuous points from four groups of discrete curves. The blue, red, and green points indicate the 𝐶⁰, 𝐶¹, and 𝐶² discontinuous points, respectively.

(a) 3D point could data of a model

(b) Extracted discontinuous points

(c) Horizontal discontinuous points

(d) Vertical discontinuous points

(e) Down-sloping discontinuous points

(f) Up-sloping discontinuous points