Da Liu, Zhenkun Lei, Hao Jiang, Ruixiang Bai. Anti-Noise Phase-Shift Coding Unwrapping Method in Fringe Projection Profilometry[J]. Acta Optica Sinica, 2020, 40(23): 2312002
- Acta Optica Sinica
- Vol. 40, Issue 23, 2312002 (2020)
Fig. 1. Optical path used in projection fringe method
Fig. 2. t and k when T=10 and p=30 pixel
Fig. 3. Effect of special point on coding unwrapping method. (a) Incorrect decoding when T=10; (b) correct decoding when T=31/3
Fig. 4. Effect of noise on coding unwrapping method. (a) Distribution of k; (b) distributions of σlim and I'N+1
Fig. 5. Simulation results. (a) Decoding results of conventional method and proposed method; (b) anti-noise effects of three discrimination methods
Fig. 6. Decoding results by proposed method in case of large noise. (a) Error decoding position and corresponding NTI index; (b) neighborhood correction result
Fig. 7. Test experiment. (a) Experimental setup; (b) measured objects
Fig. 8. Flow chart of improved phase-shift coding method
Fig. 9. Experimental process and results. (a) Fringe projecting to measured object; (b) wrapped phase of measured object; (c) distribution of k; (d) unwrapping phase; (e) 2D distribution of phase difference; (f) result by proposed decoding method; (g) result by decoding method in Ref. [14]
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