Theoretical Study on Capability of Average Quantization Grating And Median Quantization Grating in Phase-shifting Profilometry
均值量化与中值量化光栅性能的理论研究

A new design and fabrication of digital sinusoidal grating called average quantization grating,which has some improvements for traditional median quantization grating in phase-shifting profilometry with projection grating method,is proposed in this paper.In practice,the capability of average quantization grating is superior to that of traditional median quantization grating in measurement error and high-order harmonic distortion.Some factors which can influence the performance for both quantization gratings,such as original phase,discrete levels and quantization levels,are particularly discussed theoretically contrast of standard deviation and frequency magnitude between average quantization grating and median quantization grating is shown.The result shows that average quantization grating is closer to ideal sinusoidal grating than median quantization grating.