Fig. 1. "S" type error diffusion coding

Fig. 2. Binary coding. (a) Sinusoidal fringes; (b) encoding result; (c) filtered fringes

Fig. 3. Simulation results. (a) Four-step phase shift of sinusoidal fringes; (b) four-step phase shift of sinusoidal fringes encoded by "S" type paths; (c) intensity distribution at line 20 of four-step phase shift of sinusoidal fringes; (d) intensity distribution of sinusoidal bar with four-step phase shift at line 20 of "S" type path encoding; (e) phase error distribution between "S" type coded sinusoidal Fig. (b) and standard sinusoidal Fig. (a)

Fig. 4. Experimental setup

Fig. 5. Sinusoidal fringes. (a)(b)(c) Three-step phase shift fringes; (d)(e)(f) 1^st, 2^nd, and 3^rd step phase shift fringes in 20-step phase shift

Fig. 6. Phase error distribution of three-step and 20-step phase shifts

Table 1. Phase errors of different encoding methods