Fig. 1. The schematic of scanning PMP

Fig. 2. PDF distribution with different phase shift errors and their error curves. (a) The PDF of the wrapped phase calculated at different periods; (b) Comparison of the results of the period of calibration and the optimal period calculation; (c) RMSE distribution of calculation results at different periods; (d) RMSE between wrapped phase and static 12-steps phase-shift calculated at different periods

Fig. 3. Flowchart of the proposed method

Fig. 4. The experimental system and object

Fig. 5. The fringe and the white field are collected

Fig. 6. The measurement result of a coin. (a, h),(b, i),(c, j)3, 6, 12-step of classic phase shift; (d, k),(e, l),(f, m) Proposed method 3, 6, 12-step scanning phase shift

Fig. 7. Phase error of different scanning steps and static phase shift