Fig. 1. Schematic of stereo phase measuring deflectometry system

Fig. 2. Camera matching principle of stereo phase measuring deflectometry

Fig. 3. Schematic of transformation relationships among different coordinate systems

Fig. 4. Coordinate calibration for retro-reflectors in screen coordinate system

Fig. 5. Schematic of posture calibration of screen and camera

Fig. 6. Experimental setup diagram of coordinate calibration of retro-reflectors

Fig. 7. Picture of system calibration

Fig. 8. Picture of measurement experiment

Fig. 9. Surface reconstruction results of gauge blocks

Fig. 10. Reconstruction flatness of gauge block surfaces

Fig. 11. Picture of mirror to be measured

Fig. 12. Measurement results of mirror. (a) Result of mirror surface reconstruction; (b) result of surface flatness error