Fig. 1. Grating stripes with different Gamma values

Fig. 2. Real and ideal phases

Fig. 3. Influence of N to phase error. (a) Phase error; (b) variation of phase error

Fig. 4. Standard white board

Fig. 5. Histogram distribution of grayscale

Fig. 6. Gamma values in different points

Fig. 7. Brightness transfer function in different points

Fig. 8. Maximum phase error

Fig. 9. Three dimensions measurement system

Fig. 10. Main phase and corresponding phase error

Fig. 11. Compensated phase errors for different levels

Fig. 12. Histogram of graysacle

Fig. 13. Results of an image projected on a standard whiteboard with smooth surface. (a) Regional division results; (b) histogram of regional division results; (c) partially sub-regional profile

Fig. 14. Phase errors with different methods

Fig. 15. Standard checkerboard corner points

Fig. 16. Coplanarity deviation distributions before and after correction. (a) Before correction; (b) after correction

Fig. 17. Wiener statues before and after correction. (a) Before correction; (b) after correction