分区域Gamma预编码校正的相位误差补偿

针对现有结构光视觉测量中普通投影仪亮度不均匀引起系统Gamma 非线性畸变值分布差异，从而导致相位误差问题，提出了一种自适应分区域Gamma 预编码校正方法。首先，介绍了结构光双目视觉测量原理以及标准N 步相移法。接着，分析了投影仪和相机的Gamma 非线性畸变对光栅正弦性的影响以及预编码校正方法。然后，在获取Gamma 值分布规律的基础上，根据Gamma 值的变化与相位误差的关系确定分区域阈值大小。最后，根据确定的阈值对测量视场进行区域划分，获取各区域Gamma 值，并对标准白板和汽车挡泥板进行了实际测量。实验结果表明：本文方法比相同条件下采用单一Gamma 值预编码校正方法在相位误差的补偿精度上提高了约30%，在三维数据的测量精度上提高了约15%。该方法能更好地减小相位误差，提高结构光视觉测量系统的精度。

Abstract

In structured light vision measurement, since non-uniformity of brightness of the common projector caused nonlinear distortion Gamma value distribution difference resulting in phase error problem, a self-adaptive subregional Gamma value pre-coding correction method was proposed. First, the principle of structured light stereo vision measurement and standard N step phase shifting method is introduced. Second, the projector and the camera's nonlinear distortion of sine grating and the Gamma value pre-coding correction method are analyzed. Then, on the basis of Gamma value distribution, according to the relationship between the change of Gamma value and the phase error, subregional threshold was calculated. Finally, according to the threshold, the measurement field was divided and subregional Gamma pre-coding correction method was implemented, and actual measurement was carried out on a standard white plate and a fender. Experimental results indicate, under the same conditions, compared with single Gamma pre-coding correction method, the proposed method can further improve phase error compensation about 30%, and the measurement accuracy increase by about 15% in the 3D data.

参考文献

[1] 陈锋，苏显渝，向立群. 结构光投影测量中物体不连续处误差分析 [J]. 光电工程，2011，38(7)：74-80.

CHEN Feng，SU Xianyu，XIANG Liqun. Analysis of Phase Error at Discontinuities in the Measurement Based on Structured Light Projection [J]. Opto-Electronic Engineering，2011，38(7)：74-80.

[2] 黄磊，苏显渝，向立群. 在PMP 中环境光强变化引入的误差与校正 [J]. 光电工程，2006，33(9)：80-84.

HUANG Lei，SU Xianyu，XIANG Liqun. Error caused by non-constant environmental light and rectification in PMP [J]. Opto-Electronic Engineering，2006，33(9)：80-84.

[3] ZHOU Ping，LIU Xinran，ZHU Tongjing. Analysis of the relationship between fringe angle and three-dimensional profilometry system sensitivity [J]. Applied Optics(S0003-6935)，2014，53(13)：2929-2935.

[4] HOANG Thang，PAN Bing，DUNG Nguyen，et al. Generic gamma correction for accuracy enhancement in fringe-projection profilometry [J]. Optics Letters(S0146-9592)，2010，35(12)：1992-1994.

[5] ZHANG Xu，ZHU Limin，LI Youfu，et al. Generic nonsinusoidal fringe model and gamma calibration in phase measuring profilometry [J]. Journal of the Optical Society of America(S0146-9592)，2012，29(6)：1047-1058.

[6] 肖焱山，曹益平，武迎春，等. 基于傅里叶频谱分析的相位测量轮廓术系统Gamma 非线性校正方法 [J]. 光学学报，2012， 32(12)：1212004.

XIAO Yanshan，CAO Yiping，WU Yingchun，et al. Gamma Nonlinearity Correction Based on Fourier Spectrum Analysis for Phase Measuring Profilometry [J]. Acta Optica Sinica，2012，32(12)：1212004.

[7] ZHENG Dongliang，DA Feipeng. Gamma correction for two step phase shifting fringe projection profilometry [J]. Optik(S0030-4026)，2013，124：1392-1397.

[8] ZHOU Ping，LIU Xinran，HE Yi，et al. Phase error analysis and compensation considering ambient light for phase measuring profilometry [J]. Optic and Lasers in Engineering(S0143-8166)，2014，55：99-104.

[9] ZHANG Song，YAU Shing-Tung. Generic nonsinusoidal phase error correction for three-dimensional shape measurement using a digital video projector [J]. Applied Optics(S1004-924X)，2007，46(1)：36-43.

[10] MA Shengjia，QUAN Chenggen，ZHU Rihong，et al. Investigation of phase error correction for digital sinusoidal phase-shifting fringe projection profilometry [J]. Optics and Lasers in Engineering(S0143-8166)，2012，50(8)：1107-1118.

[11] LIU Kai，WANG Yongchang，QI Hao，et al. Gamma model and its analysis for phase measuring profilometry [J]. Journal of the Optical Society of America(S0146-9592)，2010，27(3)：553-562.

林俊义, 黄剑清, 江开勇. 分区域Gamma预编码校正的相位误差补偿[J]. 光电工程, 2016, 43(9): 32. LIN Junyi, HUANG Jianqing, JIANG Kaiyong. Subregional Gamma Pre-coding Correction for Phase Error Compensation[J]. Opto-Electronic Engineering, 2016, 43(9): 32.

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