Fig. 1. Fringe pattern and profile of a line in corresponding wrapped phase pattern. (a)--(c) fringe pattern; (d)--(f) profile of a line in wrapped phase pattern

Fig. 2. Object to be measured in computer simulation

Fig. 3. Deformed fringe patterns without noise. (a)--(c) Deformed fringe patterns obtained by traditional three-frequency temporal phase unwrapping method when t=1,8,64; (d)--(f) deformed fringe patterns obtained by proposed method when t=4,16,64; (g)--(i) deformed fringe patterns obtained by proposed method when t=16,32,64

Fig. 4. Reconstruction results and reconstruction errors obtained by different methods in case of no noise. (a)(b) Traditional three-frequency temporal phase unwrapping method; (c)(d) proposed method with t=4,16,64; (e)(f) proposed method with t=16,32,64

Fig. 5. Deformed fringe patterns with noise. (a)--(c) Deformed fringe patterns obtained by traditional three-frequency temporal phase unwrapping method; (d)--(f) deformed fringe patterns obtained by proposed method with t=4,16,64

Fig. 6. Reconstruction results and reconstruction errors obtained by different methods in case of noise. (a)(b) Traditional three-frequency temporal phase unwrapping method; (c)(d) proposed method with t=4,16,64

Fig. 7. Standard deviation distribution of reconstruction errors of two methods under different noises

Fig. 8. Deformed fringe patterns obtained by different methods. (a)--(c) Traditional three-frequency temporal phase unwrapping method; (d)--(f) proposed method

Fig. 9. Reconstruction results obtained by different methods. (a) Traditional three-frequency temporal phase unwrapping method; (b) proposed method; (c) local magnification of Fig. 9(a); (d) local magnification of Fig. 9(b)

Table 1. Errors of reconstruction resultsunit:mm