Fig. 1. Schematic diagram of stripe projection profilometry

Fig. 2. Example of I₀ histogram

Fig. 3. Complementary Gray code and four step phase shift graph

Fig. 4. Schematic diagram of complementary Gray code

Fig. 5. Example of image histogram at 18 ms

Fig. 6. Fringe patterns fused with different exposure times. (a) First group exposure; (b) Second group exposure; (c) Adaptive exposure

Fig. 7. Fringe image of U-card in different methods. (a) Projection phase method; (b) Methods of Ref.[11]; (c) Proposed method

Fig. 8. Fringe image of connection block in different methods. (a) Projection phase method; (b) Methods of Ref.[11]; (c) Proposed method

Fig. 9. Fringe image of disc in different methods. (a) Projection phase method; (b) Methods of Ref.[11]; (c) Proposed method

Fig. 10. Point cloud image of U-card in different methods. (a) Projection phase method; (b) Methods of Ref.[11]; (c) Proposed method

Fig. 11. Point cloud image of U-card in different methods. (a) Projection phase method; (b) Methods of Ref.[11]; (c) Proposed method

Fig. 12. Point cloud image of disc in different methods. (a) Projection phase method; (b) Methods of Ref.[11]; (c) Proposed method

Fig. 13. The number and reconstruction rate of 3D point clouds measured using different methods. (a) U-card; (b) Connection block; (c) Disc

Fig. 14. Standard block step height measurement. (a) Standard block ladder physical diagram; (b) Standard block ladder 3D point cloud encapsulation diagram; (c) Height difference measurement results