结构光测量系统的误差传递分析

Error propagation analysis of structured light system

针对基于交比不变原理的结构光光平面标定方法,利用误差分析理论和矩阵扰动原理分别对系统的测量误差和光平面标定误差进行分析,提出了结构光测量系统的误差传递模型。给出了满足在1 000 mm的测量距离上获得±0.5mm的测量精度情况下,各标定参数所需要的精度要求,以及标定样本提取的精度要求。通过实测实验结果,验证了误差分析的有效性。该误差分析为提高结构光系统的测量精度提供了理论依据。

To study the calibration accuracy of stuctured light system based on cross ratio invariant, measuring error and light-plane calibration error of system are analyzed, and an error propagation model is established by employing theories of error and matrix disturbance. According to the error propagation model, the precision demands of calibration parameters and samples under a special condition in measuring distance of 1 000 mm and measuring accuracy of ±0.5 mm is presented. The error propagation model is validated through experiments, experimental results show that proposed model can provide theory basis for improving measuring accuracy of structured light system.