Fig. 1. Simulated phase distribution and two phase shifted interferograms. (a) Theoretical phase distribution; (b) first and (c) second interferograms

Fig. 2. Phase distributions extracted by different phase shifting algorithms in three different situations

Fig. 3. Phase error distributions of different phase shifting algorithms in three different situations

Fig. 4. Iterative curves of different phase shifting algorithms in three different situations

Fig. 5. RMS phase errors and computational time of different algorithms in three different situations. (a) RMS phase errors; (b) computational time

Fig. 6. Simulation results of SD2&FLSA with different numbers of chosen pixels when size of interferogram is 401 pixel×401 pixel. (a) Number of iterations; (b) computational time; (c) RMS phase error; (c) phase shifting error

Fig. 7. Simulation results of SD2&FLSA with different numbers of chosen pixels when size of interferogram is 801 pixel×801 pixel. (a) Computational time; (b) RMS phase error

Fig. 8. RMS phase errors of SD2&FLSA with different phase shifts in six different situations

Fig. 9. Experimental phase shifted interferograms and phase distribution. (a) First and (b) second interferograms; (c) reference phase distribution extracted by four-step phase shifting algorithm

Fig. 10. Experimental results of different algorithms. (a)--(f) Phase distributions; (g)--(l) phase error distributions; (m)--(o) iterative curves