Fig. 1. Three-frequency optical heterodyne principle

Fig. 2. Jumping error. (a) Jumping error of Δn12; (b) error of Δn123; (c) flooring error of N1; (d) error of ?1

Fig. 3. Results of phase unwrapping with different errors. (a) φerror=π/13; (b)(c) φerror=π/15; (d) φerror=π/25

Fig. 4. Error distribution comparison. (a) Unwrapped by proposed algorithm; (b) unwrapped by existing method

Fig. 5. Experiment platform

Fig. 6. (a) Captured by camera; (b) wrapped phase

Fig. 7. Reconstruction results. (a)(b) Unwrapped by existing algorithm; (c)(d) unwrapped by proposed algorithm

Fig. 8. Plane fitting results. (a) Unwrapped by existing algorithm; (b) unwrapped by proposed algorithm