Zonghua Zhang, Yanling Li, Feng Gao, Nan Gao, Zhaozong Meng, Xiangqian Jiang. Phase unwrapping technology for structured light three-dimensional measurement: A review (invited)[J]. Infrared and Laser Engineering, 2023, 52(8): 20230126
- Infrared and Laser Engineering
- Vol. 52, Issue 8, 20230126 (2023)
Fig. 1. Gray code encoding and decoding process
Fig. 2. Schematic diagram of the optimal three-frequency selection. (a) Wrapped phase with fringe frequency of 9; (b) Wrapped phase with fringe frequency of 8; (c) Wrapped phase with fringe frequency of 6; (d) Unwrapped phase
![Example of phase unwrapping based on directional parallel mapping[73]](/Images/icon/loading.gif){kind=icon}
Fig. 3. Example of phase unwrapping based on directional parallel mapping[73]
Fig. 4. The diagram of the proposed method by Yin et al[104]
Fig. 5. (a) Flowchart of the proposed method in Ref. [107]; (b) Schematic of CNN1; (c) Schematic of CNN2
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Table 1. Comparison of typical phase unwrapping methods
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