Fig. 1. Laser scanning projection system

Fig. 2. Integral sampling circuit

Fig. 3. Simulation circuit

Fig. 4. Timing and output simulation of sampling circuit

Fig. 5. Correlation double sampling detection prototype module

Fig. 6. Laser converges on the reflective target

Fig. 7. Ambient light simulation experiment

Fig. 8. Scanning results of avalanche photodiodes under different ambient light intensities. (a) Ambient light generated current is 100 μA; (b) ambient light generated current is 600 μA ; (c) ambient light generated current is 1000 μA

Fig. 9. Correlation double sampling detection module

Fig. 10. Scanning process. (a) Scanning diagram; (b) scan flowchart

Fig. 11. Schematic diagram of dot matrix scanning.(a) Main view angle; (b) side view angle

Fig. 12. Discontinuous scanning path based on bisection principle

Fig. 13. Discontinuous scanning process based on bisection principle

Fig. 14. Perspective projection model of target

Fig. 15. Laser scanning projection system

Fig. 16. Grid scanning path

Fig. 17. Boundary extraction using Canny operator

Fig. 18. Gray-scale maps of raster scanning results

Fig. 19. Results of the two methods for the centering of these targets

Fig. 20. Measurement points obtained by proposed method