Xinyi Zeng, Shiqian Wu, Bin Chen. Hybrid-Coded Phase-Shifting Profilometry for Structured Light Measurement[J]. Laser & Optoelectronics Progress, 2022, 59(13): 1312002
- Laser & Optoelectronics Progress
- Vol. 59, Issue 13, 1312002 (2022)
Fig. 1. Correspondence among wrapped phase, unwrapped phase, and phase order
Fig. 2. Correspondence between Gray code and phase
Fig. 3. Wrapped phase and intensity of sinusoidal stripe after amplitude modulation. (a) Wrapped phase; (b) corresponding intensity of sinusoidal stripe
Fig. 4. Mean error of the unwrapped phase in different periods
Fig. 5. Correspondence between the number of phase periods and De Bruijn sequence
Fig. 6. Four computer generated projection patterns
Fig. 7. Flowchart of unwrapping phase
Fig. 8. Incomplete period case. (a) Occluding falling edge, only left rising edge; (b) occluding rising edge, only left falling edge
Fig. 9. Symbol judgment error caused by the maximum value being blocked
Fig. 10. A mask. (a) Object to be tested; (b) fringe image captured by camera; (c) wrapped phase; (d) unwrapped phase
Fig. 11. 3D point cloud results. (a) Frontal result; (b) profile result
Fig. 12. Two water pipes placed front and back. (a) Object to be tested; (b) wrapped phase
Fig. 13. Phase unwrapping. (a) Wrapped phase; (b) phase order; (c) unwrapped phase
Fig. 14. Comparison of the reconstruction results between Gray code combined with phase-shifting method and the proposed method
Fig. 15. Reconstruction results of flat plate. (a) Reconstruction result of Gray code combined with phase-shifting method; (b) reconstruction results of multi-frequency heterodyne; (c) reconstruction results of proposed method
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Table 1. Comparison of phase coding methods
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Table 2. Accuracy comparisons between Grey code + phase-shifting method, multi-frequency heterodyne, and proposed method
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