Fig. 1. U-Net network structure

Fig. 2. Schematic of sub-pixel convolution upsampling

Fig. 3. DSSINet network structure

Fig. 4. USS-Net structure

Fig. 5. SSIF dataset examples

Fig. 6. ESIF dataset examples

Fig. 7. Schematic of phase recovery effect of SSIF dataset. (a) Simulated fringe image; (b) network output diagram; (c) true package phase value; (d) unfolding phase of network output diagram; (e) true unwrapping phase value

Fig. 8. Schematic of phase recovery effect of ESIF dataset. (a) Experimental fringe image; (b) network output diagram; (c) wrapped phase value obtained by four-step phase shifting method; (d) unfolding phase of network output diagram; (e) true unwrapping phase value

Fig. 9. Unfolded phase error analysis. (a)-(e) Phase error corresponding to the five experimental fringe patterns in Fig. 8 respectively