Fig. 1. Diagram of experimental principle

Fig. 2. Diagram of the experimental platform

Fig. 3. Result comparison of phase calculation method before and after improvement. (a) Object to be measured; (b) result of traditional phase calculation method; (c) result of improved method

Fig. 4. Three-dimensional shape restored by improved phase calculation method. (a) Actual image; (b) depth map of phase unwrapping; (c) depth map of phase difference; (d) three-dimensional structured map

Fig. 5. Test results for whiteboard. (a) Scene; (b) phase measurement profilometry; (c) time defocus analysis method; (d) proposed method; (e) value in 100th column in Fig. 5 (b); (f) value in 100th column in Fig.5 (c); (g) value in 100th column in Fig.5 (d)

Fig. 6. Experimental results of the proposed method