Fig. 1. (a) Original wrapped phase pattern with noise; (b) fringe orientation map

Fig. 2. (a) Noise-free sin fringe pattern; (b) maps of different filtering windows

Fig. 3. Simulated phase fringe patterns and experimental results. (a) Noise-free phase fringe pattern; (b) simulated fringe pattern with Gaussian noise; results of Fig. 3(b) filtered for 5 times by using window sizes of (c) 3×3,(d) 3×5, (e) 3×7, (f) 5×3, (g) 7×3 and (h) the proposed method, respectively

Fig. 4. Standard deviation distributions of the difference between fringe patterns from two adjacent filterings and that between filtered fringe patterns and noise-free ones, respectively

Fig. 5. Speckle phase fringe patterns and experimental results. (a) Phase fringe pattern; results of Fig. 5(a) filtered for 10 times by using window sizes of (b) 3×3; (c) 3×5; (d) 5×3; (e) 7×3 and (f) the proposed method, respectively

Fig. 6. Phase distributions of cross-section A-A for different patterns. (a) Fig. 5(a); (b) Fig. 5(c); (c) Fig. 5(e); (d) Fig. 5(f)

Table 1. Set of filtering windows