摘要
数字相移测量的主要误差来源于由数字投影机引入的Gamma(γ)畸变。投影范围内的γ非一致性使得基于单一γ的校正技术和相位误差补偿技术存在较大残余误差。在分析γ非均匀分布的基础上,提出了基于像素的相位误差查找表补偿方法。该方法根据像素自身的γ,动态地建立相应的相位误差查找表,进行相位误差补偿,有效提高了补偿精度。对实际测量结果做了分析并与基于单一γ的方法进行了比较,证明了基于像素的相位误差查找表补偿方法能够获得更高的精度。
The Gamma （γ） distortion caused by digital video projector contributes most for phase error in digital fringe projection profilometry. The residue phase error is still non- negligible after ？, correction and phase error compensation based on single γ value. By analyzing the non-uniform distribution of γ, a novel phase error compensation technique, which dynamically constructs the phase error look-up-table （LUT） regarding to the y value of the specific pixel, is introduced and it effectively improves the accuracy of phase error compensation. The measured results are analyzed and compared and it shows that higher accuracy could be achieved with this method.
出处
《光学仪器》
2013年第1期6-11,17,共7页
Optical Instruments
基金
国家973重点基础研究项目(2011CB706804)
上海市基础研究重点项目(10JC1408000)
关键词
相移
γ标定
相位误差
phase shifting
γ calibration
phase error
