Jie Li, Bin Chen, Xinyi Zeng, Shiqian Wu. Phase Unwrapping Algorithm for Structured Light Based on Fringe-Order Encoding and Modulation[J]. Acta Optica Sinica, 2022, 42(9): 0912005
- Acta Optica Sinica
- Vol. 42, Issue 9, 0912005 (2022)
Fig. 1. Flow diagram of temporal phase unwrapped algorithm. (a) Phase shifting image; (b) wrapped phase; (c) Gray-code image; (d) order of each period; (e) unwrapped phase
Fig. 2. Period-order coding sequence used in this paper
Fig. 3. Coding phase diagram
Fig. 4. Four-step phase shift fringe images corresponding to adjusted phase
Fig. 5. Phase error for different number of divided segments
Fig. 6. Decoding and phase unwrapping process
Fig. 7. Schematic diagram of influence of occlusion on decoding
Fig. 8. Continuous symbol matching
Fig. 9. Reconstruction process of facial mask. (a) Image of phase-level encoding; (b) wrapped phase obtained by four-step phase-shifting method; (c) absolute phase obtained by decoding algorithm proposed in this paper; (d) side view of reconstructed facial mask
Fig. 10. Analysis of workpiece occlusion. (a)(e) Workpieces placed in two positions; (b)(f) wrapped phase; (c)(g) wrapped phase after removing phase outliers; (d)(h) unwrapping phase
Fig. 11. Experiment of 3D object reconstruction. (a)--(c) Objects to be reconstructed, which can be divided into ceramic pot and workpieces placed in two different ways; (d)--(f) reconstruction results
Fig. 12. Results of 3D plate reconstructed by three methods. (a) Proposed method; (b) multi-frequency heterodyne method; (c) gray-code plus phase-shifting method
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Table 1. Comparison of results of three reconstruction methods
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