Fig. 1. Diagram of deflectometric measurement

Fig. 2. Camera lens layout

Fig. 3. Camera lens standard spot diagram

Fig. 4. Camera lens distortion

Fig. 5. Camera structure model diagram

Fig. 6. Calibration diagram of rays

Fig. 7. The calculating process of reflected rays and measured points

Fig. 8. Coordinates of off-axis aspheric surface

Fig. 9. Experimental setup

Fig. 10. Calibration of screen pixel coordinates

Fig. 11. Calibration of reflected light direction

Fig. 12. Reconstruction results

Fig. 13. Comparison of different measurement methods

Fig. 14. Comparison of reconstruction results of off-axis paraboloid