Fig. 1. Schematic diagram of sampling moire method at T=4

Fig. 2. Spreading results of different times iteration

Fig. 3. Flow chart of spatiotemporal phase-shifting method for interferograms of apertures with arbitrary shape

Fig. 4. Four simulated phase-shifting interferograms

Fig. 5. Relations between the number of critical iterations, the total number of pixels and proportion of effective regions

Fig. 6. Simulation results

Fig. 7. Spreading results of interferograms with different shape apertures

Fig. 8. Structure diagram of interferometer optical path

Fig. 9. Four interferograms collected in experiment

Fig. 10. Experimental results