Fig. 1. Flow chart of three-dimensional (3D) reconstruction

Fig. 2. Flow chart of multi-exposure fringe sequence synthesis

Fig. 3. Image capture process of structured light system

Fig. 4. Experimental platform. (a) Schematic of hardware system; (b) physical photo

Fig. 5. Absolute phase difference value

Fig. 6. Experimental sample. (a) Physical photo of PCB; (b) multiple exposure image sequences of PCB

Fig. 7. Fringe images of PCB using different methods. (a) Projection grating phase method; (b) method of Ref. [20]; (c) method of Ref. [21]; (d) proposed method

Fig. 8. 3D reconstruction results. (a) Projection grating phase method; (b) method of Ref. [20]; (c) method of Ref. [21]; (d) proposed method

Fig. 9. Measurement results of standard ball. (a) Point cloud; (b) fitting sphere; (c) fitting error distribution

Fig. 10. Single point error of PCB surface. (a) PCB1; (b) PCB2