Fig. 1. Overall flow chart of proposed method

Fig. 2. B-spline curve drawn by CAD software

Fig. 3. Projection graph feature regional division. (a) Theoretical model of projection curve; (b) non-feature point set; (c) feature point set

Fig. 4. Distance d from the point to be diluted to the corresponding straight line

Fig. 5. Data point dilution process based on the spatial resolution of the human eye

Fig. 6. Projection experimental device. (a) Projection experiment board; (b) self-developed laser scanning projection system

Fig. 7. Optimization and projection results of M1 curve. (a) Theory digital model of M1 curve; (b) simulation result of the proposed optimization method; (c) simulation result of chord height compression algorithm; (d) projection result of the proposed optimization method; (e)(f) detailed drawings of the frames in Fig. 7(b)

Fig. 8. Optimization and projection results of M2 curve. (a) Theory digital model of M2 curve; (b) simulation result of the proposed optimization method; (c) simulation result of chord height compression algorithm; (d) projection result of the proposed optimization method; (e)(f) detailed drawings of the frames in Fig. 8(b)

Fig. 9. Optimization and projection results of M3 curve. (a) Theory digital model of M3 curve; (b) simulation result of the proposed optimization method; (c) simulation result of chord height compression algorithm; (d) projection result of the proposed optimization method; (e)(f) detailed drawings of the frames in Fig. 9(b)

Fig. 10. Optimization and projection results of M4 curve. (a) Theory digital model of M4 curve; (b) simulation result of the proposed optimization method; (c) simulation result of chord height compression algorithm; (d) projection result of the proposed optimization method; (e)(f) detailed drawings of the frames in Fig. 10(b)

Fig. 11. Projection effects of complex curves by different methods. (a) Chord height compression algorithm; (b) proposed method

Fig. 12. Projection effects before and after the optimization of the FARO projection system by the proposed method. (a) FARO laser projector; (b) optimized projection; (c) unoptimized projection

Fig. 13. Curved surface projection effects of 3D graphics using the self-developed scanning projection system. (a) Theoretical model; (b) physical map; (c) front view of projection; (d) side view of projection

Fig. 14. Plane projection effects of 3D graphics using the self-developed scanning projection system. (a) Theoretical model; (b) physical map; (c) front view of projection; (d) side view of projection