Method of locating the mirror center of laser tracker target ball

Q4 Physics and Astronomy

光学技术 Pub Date : 2014-01-01 DOI:10.3788/GXJS20144004.0362

姜吉祥 Jiang Ji-xiang, 屈玉福 Qu Yu-fu, 邓湘金 Deng Xiangjin, 郑燕红 Zheng Yanhong

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引用次数: 2

Abstract

When using laser tracker to conduct global calibration of multi-sensor 3Dvision measuring system,to accurately locate the mirror center of target ball is a challenge due to the complexity of calibration field environment since the spot appearance of target ball is heavily influenced by environment light intensity,visual observation angle of measuring system and projection angle of laser.A method of locating the mirror center of laser tracker target ball is presented,which is free to illumination changes,no requirement of laser spot shape or the distribution of light intensity.First,the image segmentation algorithm is used to accurately locate the target ball area and obtain a located area.The located area is then filtered to reduce the image noise as well as enhance the visibility of the target ball and its background.After that,a mirror area of target ball is obtained by segmenting the target ball,removing strong reflective area and using morphological image processing in sequence.Finally,a mirror center position coordinates of target ball are calculated by performing the statistics of the pixel coordinates of the mirror area.Experiments on 2048×2048pixel complex spot images are carried out.Experimental results show that the correctly positioned rate is 91.2%,and the average position RMS errors is no more than 0.74pixel,which indicates that the proposed method can basically satisfy the requirements of the mirror positioning accuracy in global calibration.

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激光跟踪靶球反射镜中心定位方法

在利用激光跟踪器对多传感器三维视觉测量系统进行全局标定时，由于标定场环境的复杂性，目标球的光斑外观受环境光强、测量系统的视觉观测角度和激光投影角度的影响很大，因此准确定位目标球的镜面中心是一个挑战。提出了一种不受光照变化、不受光斑形状和光强分布要求的激光跟踪器靶球镜心定位方法。首先，利用图像分割算法对目标球区域进行精确定位，得到定位区域;然后对定位区域进行滤波，以减少图像噪声，并增强目标球及其背景的可见性。然后依次对目标球进行分割、去除强反射区域、形态学图像处理，得到目标球的镜像区域。最后，通过统计镜像区域的像素坐标，计算出目标球的镜像中心位置坐标。在2048×2048pixel复杂光斑图像上进行了实验。实验结果表明，该方法的定位正确率为91.2%，平均位置均方根误差不大于0.74像素，基本满足全局定标中对反射镜定位精度的要求。

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来源期刊

光学技术 Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

0.60

自引率

0.00%

发文量

6699

期刊介绍： The predecessor of Optical Technology was Optical Technology, which was founded in 1975. At that time, the Fifth Ministry of Machine Building entrusted the School of Optoelectronics of Beijing Institute of Technology to publish the journal, and it was officially approved by the State Administration of Press, Publication, Radio, Film and Television for external distribution. From 1975 to 1979, the magazine was named Optical Technology, a quarterly with 4 issues per year; from 1980 to the present, the magazine is named Optical Technology, a bimonthly with 6 issues per year, published on the 20th of odd months. The publication policy is: to serve the national economic construction, implement the development of the national economy, serve production and scientific research, and implement the publication policy of "letting a hundred flowers bloom and a hundred schools of thought contend".