Fig. 1. Principle diagram of proposed method. (a) Optical path for vertical fringe projection;(b) optical path for horizontal fringe projection

Fig. 2. Principle of height mapping. (a) Modulation curves of two grating fringes; (b) distribution of parameter MR

Fig. 3. Principle diagram of system calibration

Fig. 4. Measured plots at several pixels: (a) Modulation cross curves;(b) MR curves inside the purple square area of Fig.4(a)

Fig. 5. Measurement results of testing plane. (a) Vertical phase-shifting fringe patterns of testing plane; (b) horizontal phase-shifting fringe patterns of testing plane; (c) 3D shape of reconstructed plane

Fig. 6. Measurement results of standard sphere. (a) Vertical phase-shifting fringe patterns of the standard sphere; (b) horizontal phase-shifting fringe patterns of standard sphere; (c) 3D shape of reconstructed sphere

Fig. 7. Measurement results of stepped object. (a) Vertical phase-shifting fringe patterns; (b) horizontal phase-shifting fringe patterns; (c) picture of object to be tested; (d) 3D shape of reconstructed object