Fig. 1. Phase unwrapping

Fig. 2. Field of view of camera

Fig. 3. Phase unwrapping result of workpieces (left camera). (a) Grating stripe; (b) phase unwrapping

Fig. 4. Absolute phase values of the 315th line. (a) Phase value before correction; (b) phase value after correction

Fig. 5. System construction and data collection. (a) Structured light measurement system; (b) grating stripe

Fig. 6. Full-field continuous absolute phase at frequency of 1/64 (left camera). (a) Absolute phase before correction; (b) absolute phase corrected by monotonic method; (c) absolute phase corrected by proposed method; (d) absolute phaseheight before correction; (e) absolute phase height corrected by monotonic method; (f) absolute phase height corrected by proposed method

Fig. 7. Three-dimensional point cloud andtriangular plate model of five kinds of workpieces. (a) Grating projection; (b) absolute phase height before correction (left camera); (c) absolute phase height corrected by proposed method; (d) three-dimensional point cloud; (e) triangular plate model

Table 1. Standard deviation of triangular plate model of five kinds of workpieces

Table 2. Fitting results of diameter and height of cylindrical workpiecemm