OptiTrack系统点位测量的精度测试

Precision Testing of OptiTrack System for Point Measurement

OptiTrack系统用于工业测量前需要先对其测量精度进行测试。利用平面测量点对OptiTrack系统分别进行了内符合精度和外符合精度测试实验,实验结果表明在3m范围内,OptiTrack系统三维坐标重复测量精度优于0.04mm,点位测量的均方根误差优于0.2mm,可满足中等精度工业测量需求。使用控制变量法分析了帧率、曝光时间、灰度阈值、红外LED亮度四个系统参数的取值与OptiTrack系统测量精度的关系,得出了实验环境下四个参数对测量精度的影响规律。

The measurement precision of the OptiTrack system needs to be tested before being used for industrial measurement.The plane measurement points are used to carry out the inside precision test and the outside precision test of the OptiTrack system.The test results show that in the range of 3 meters,the precision of 3D coordinate measurement of the OptiTrack system is better than 0.04 mm,and the root mean square error of point measurement is better than 0.2 mm,which can meet the needs of medium precision industrial measurement.The relationship between the four parameters of frame rate,exposure time,gray threshold,infrared LED illumination and the accuracy of the OptiTrack system is analyzed by using the control variable method.The effects of the four parameters on the measurement accuracy are summarized.