Fig. 1. Schematic of measurement

Fig. 2. Phase-shifting direction of projected fringe

Fig. 3. Experimental results of the expected phase plane. (a) One frame of projected fringe patterns; (b) expected phase plane; (c) nonlinear phase error distribution; (d) the 200th column of the nonlinear phase error distribution in Fig. 3(c)

Fig. 4. Experimental results of the plane at 6 mm and the reference plane. (a) the 300th column of the unwrapped phase distribution of the reference plane and the measured plane at 6 mm; (b) relationship between the unwrapped phase and the nonlinear phase error in the dashed rectangle of Fig. 4(a)

Fig. 5. Experimental results of plane at 5 mm. (a) Traditional PMP method; (b) Zhang's method; (c) proposed method; (d) the 200th column of phase distribution in Fig. 5(a), (b) and (c); (e) the reconstructed result of the plane at 5 mm by the proposed method

Fig. 6. Measuring results of “heart” object. (a) “heart” object; (b) one frame of captured deformed patterns; (c) wrapped phase

Fig. 7. Reconstructed results of “heart” object. (a) Traditional PMP method; (b) Zhang's method; (c) proposed method; (d) the 260th column cutaway view of Fig. 7(a); (e) the 260th column cutaway view of Fig. 7(b); (f) the 260th column cutaway view of Fig. 7(c)