Fig. 1. Launching and receiving devices of orthogonally invisible structured light

Fig. 2. Synchronous phase-shifting model of receiving system

Fig. 3. Fringes contrast before and after frequency domain enhancement. (a) Fringes before frequency domain enhancement; (b) fringes after frequency domain enhancement; (c) 3D frequency spectrogram before frequency domain enhancement; (d) 3D frequency spectrogram after frequency domain enhancement

Fig. 4. Fringes contrast before and after filtering. (a) Fringes before filtering; (b) fringes after filtering

Fig. 5. Physical map of spherical cap

Fig. 6. Simultaneously acquired four-step phase shifting fringe image

Fig. 7. Wrapped phase image

Fig. 8. Unwrapped continuous phase image

Fig. 9. 3D reconstruction result of spherical cap. (a) 3D map; (b) 3D contour map

Fig. 10. Effective elimination of dynamic background light. (a) Four-step phase shifting fringes under dynamic background light interference; (b) elimination of dynamic background light after image subtraction

Fig. 11. Improvement of complex domain image before and after frequency domain processing. (a) Fringes before frequency domain processing; (b) fringes after frequency domain processing; (c) 3D frequency spectrogram before frequency domain processing; (d) 3D frequency spectrogram after frequency domain processing

Fig. 12. Dynamic background light intensity map acquired by camera

Fig. 13. 3D reconstruction results in dynamic background light environment. (a)(b) Physical map in both time; (c)(d) four-step phase-shifting fringes in both time; (e)(f) 3D contour map in both time