Fig. 1. Projected fringe patterns. (a) High-frequency fringes; (b) low-frequency fringes; (c) low-frequency fringe obtained by proposed method

Fig. 2. Fringe order diagrams. (a) Fringe order affected by noise; (b) a line of Fig. 2(a); (c) processed fringe order by proposed method

Fig. 3. Regional gray-code map

Fig. 4. Simulation results. (a)(d)(g) Simulation results of dual-frequency method when adding Gaussian white noise of 20 dB, 25 dB, and 30 dB; (b)(e)(h) simulation results of three-frequency method when adding Gaussian white noise of 20 dB, 25 dB, and 30 dB; (c)(f)(i) simulation results of proposed method when adding Gaussian white noise of 20 dB, 25 dB, and 30 dB

Fig. 5. Captured pictures. (a) High-frequency image; (b) low-frequency image; (c) regional quantization map

Fig. 6. Absolute phase diagrams. (a) Traditional dual-frequency method; (b) traditional three-frequency method; (c) proposed method