Tingting Pu, Zhoujie Wu, Qican Zhang. Dynamic Three-Dimensional Measurement Technology Based on Gray Code and Phase-Shifting Algorithm[J]. Acta Optica Sinica, 2021, 41(5): 0512001
- Acta Optica Sinica
- Vol. 41, Issue 5, 0512001 (2021)
Fig. 1. Distribution of Gray code words
Fig. 2. Composite fringe images based on shifting Gray code encoding
Fig. 3. Pattern sequences to be projected
Fig. 4. Binarization process
Fig. 5. Correspondence between Cj(x,y,m) and Bj(x,y,m)
Fig. 6. Correspondence between wrapped phase and two sets of fringe orders. (a) Fringe order obtained by traditional Gray code decoding; (b) wrapped phase; (c) fringe order obtained by shifting Gray code decoding
Fig. 7. Phase unwrapping process of extended 32-period fringe. (a) Wrapped phase; (b) 4 primary unwrapping phase of 8-period fringe and unwrapped phase of reference plane; (c) unwrapped phase of object to be tested
Fig. 8. STD distribution of absolute phase of standard plane corresponding to different P
Fig. 9. Binarization results of Gray code patterns corresponding to different P. (a) P=0.5; (b) P=0.6; (c) P=0.7; (d) P=0.8
Fig. 10. 3D measurement results of isolated objects. (a) One frame of composite deformed pattern; (b) white field pattern obtained by camera; (c) restored phase using traditional Gray code method; (d) restored phase using proposed method
Fig. 11. Measurement results of flower model with nonuniform surface reflectivity. (a) One frame of composite deformed pattern; (b) white field pattern obtained by camera; (c) restored phase using traditional Gray code method; (d) restored phase using proposed method
Fig. 12. Dynamic 3D measurement results of fan during rotation. (a) Six frames of composite fringe patterns obtained by high-speed camera; (b) white fields with object information; (c) restored phase results corresponding to Fig. 12 (a)
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Table 1. Correspondence between decimal number and fringe order
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