Fig. 1. On-line 3D measurement system based on full-cycle equal phase-shift algorithm

Fig. 2. Dual-frequency fringe pattern

Fig. 3. Extracted modulation patterns in simulation. (a) Measured object; (b) first deformed fringe pattern; (c) spectral distribution of first deformed fringe pattern; (d) modulation pattern corresponding to first deformed fringe pattern

Fig. 4. Simulated reconstruction. (a) First deformed fringe pattern after pixel matching; (b) second deformed fringe pattern after pixel matching; (c) reconstructed object; (d) error distribution

Fig. 5. Simulated reconstruction obtained with different methods. (a) Spectrum of first deformed fringe pattern after pixel matching obtained with filtering method; (b) first low-frequency component fringe pattern obtained with filtering method; (c) reconstructed object obtained with filtering method; (d) error distribution obtained with filtering method; (e) reconstructed object obtained with the method in Ref.[14]; (f) error distribution obtained with the method in Ref.[14]

Fig. 6. Experimental setup

Fig. 7. Reconstruction experiment. (a) Measured object; (b) first deformed fringe pattern; (c) modulation pattern corresponded to first deformed fringe pattern; (d) first deformed fringe pattern after pixel matching; (e) reconstructed object; (f) cross section at y=320 pixel

Table 1. Reconstruction errors obtained with three methods

Table 2. Measurement errors of planes with height of 3 mm obtained with three methods