中国激光, 2020, 47 (6): 0604004, 网络出版: 2020-06-03
光栅结构光系统测量误差与拟合精度研究 下载: 1091次
Measurement Error and Fitting Accuracy of Fringe Structured Light System
测量 光栅结构光 测量误差 概率分布 模型拟合 最小二乘法 measurement fringe structured light measurement error probability distribution model fitting least squares method
摘要
针对光栅结构光系统测量误差对拟合结果的影响,提出了一种基于测量环境的误差确定方法。统计不同光源环境及测量距离下的高度测量误差,利用参数或非参数拟合获取其概率密度函数,将上述误差连同平面测量误差一起添加至理想平面模型,通过最小二乘法仿真计算出模型的法向量及定点坐标。实验结果表明:该方法得到的模型参数与根据真实测量数据计算得到的数值基本一致,法向及定点误差分别低于0.001 rad和0.233 mm;所提方法能有效解决光栅结构光系统在不同环境下测量结果精确度不高的问题,此外还能应对实际点云因数据缺失等因素而难以实现高精度拟合的情况,为后续误差校正提供依据。
Abstract
Aiming at the influence of fringe structured light system on the fitting result from the measurement error, an error determination method based on measurement circumstance is proposed in this study. First, the height measurement error under different lighting conditions and measurement distances is counted. Then, the probability density function is obtained using parametric or non-parametric fitting. The abovementioned error combined with the plane measurement error is added to the ideal plane model. Finally, the normal vector and fixed point coordinates are calculated using the least square method. Experiment results show that the model parameters calculated using the proposed method are consistent with those from the actual measurement. The vector and coordinate errors are less than 0.001 rad and 0.233 mm, respectively. The proposed method can effectively solve the low accuracy problem of the measurement results of the fringe projection structured light system in different environments. In addition, it can cope with situations wherein it is difficult for an actual point cloud to achieve high-precision fitting owing to data loss, which provides a basis for subsequent error corrections.
王潇, 刘育梁, 李丽艳. 光栅结构光系统测量误差与拟合精度研究[J]. 中国激光, 2020, 47(6): 0604004. Wang Xiao, Liu Yuliang, Li Liyan. Measurement Error and Fitting Accuracy of Fringe Structured Light System[J]. Chinese Journal of Lasers, 2020, 47(6): 0604004.