摘要
平面标靶在中长距离三维激光扫描仪的检校、数据采集、单点测量等环节中发挥着重要作用,而平面标靶的高精度、自动化识别是在其使用中面临的一个关键问题。在分析扫描数据特点的基础上,提出一种基于回光强度的平面标靶自动识别方法。具体的步骤为:改正回光强度以消除距离的影响;基于回光强度进行阈值分割以得到平面标靶点云;提出一种基于扫描线的聚类算法,将平面标靶点云聚集在一起;采用形状检测技术排除非标靶对象;采用回光强度加权法计算平面标靶中心的三维坐标。通过对Riegl公司的三维激光扫描仪LMS Z620获取的实测数据进行实验,结果表明:此方法能完成标靶的快速、全自动识别,点位精度优于2 mm,能够满足测量任务的需要。
Planar target plays an important role in the calibration, data collection and single point measurement of 3D laser scanner of middle and long range. The high precision and automatic recognition of planar targets is a key problem in application of laser scanner. A new recognizing method was put forward by using return light intensity based on analyzing the character of scan data. The steps are as follows： the return light intensity was corrected to eliminate the effects of distance. The point cloud of planar target was obtained by threshold segmenting based on return light intensity. A cluster method was proposed to gather the point cloud of planar target. The area detection was adopted to eliminate those objects which were not real target. 3D coordinate of planar target center was computed by adopting return light intensity weighting method. Experimental results obtained by using Riegl＇s LMS Z620 show that this method can realize the full automatic recognition quickly with the accuracy of point position better than 2 mm and meet the needs of survey task.
出处
《红外与激光工程》
EI
CSCD
北大核心
2011年第10期1910-1913,共4页
Infrared and Laser Engineering
基金
矿山空间信息技术国家测绘局重点实验室(河南理工大学
河南省测绘局)开放基金(KLM201109)
关键词
目标识别
平面标靶
回光强度
聚类分析
标靶定位
target recognition
planar target
return light intensity
cluster analysis
target centering
作者简介
王力（1984-），男，博士生，主要从事精密工程测量方法与仪器方面的研究。Email：wanglihong88521@sina．com
导师：李广云（1965-），男，教授，主要从事精密工程测量、精密工业测量方面的研究。Email：guanyun_li@sina．com
