Fig. 1. Structural diagram of measurement system

Fig. 2. Schematic diagram of measurement

Fig. 3. Schematic of topological relation and triangulation

Fig. 4. Experimental platform

Fig. 5. Schematic of control principle of measurement system

Fig. 6. Flow chart of algorithm

Fig. 7. Original point cloud

Fig. 8. Point cloud after filtering

Fig. 9. Fitting effect (a) 3D view; (b) XY view; (c) XZ view; (d) YZ view

Fig. 10. Normal vector of point cloud. (a) Side view; (b) top view

Fig. 11. Normal vector map obtained from PCA algorithm

Fig. 12. (a) Simulation interface of processing path; (b) comparison between practical and theoretical paths