摘要
隧道中轴线可以反映隧道的整体走势,而中轴线的准确性影响着隧道点云数据的后续处理。对此,该文提出一种自动提取中轴线的方法,将点云数据投影后利用单位圆极坐标相邻角度差来确定边界点,根据RanSAC算法对不同参数模型进行统计,对直线段、缓和曲线及曲线的曲段进行区分,然后利用RanSAC算法对不同区段拟合,提取各区段的中轴线,对各区段中轴线进行加权整体最小二乘法拟合,最终得到整段中轴线。该文采用上海隧道点云数据进行了中轴线自动提取实验。实验证明了该方法能有效提取中轴线。
The tunnel central axis can reflect the overall trend of the tunnel,and its accuracy affects the processing of the tunnel point cloud data. In this paper, the automatic extraction method for central axis is presented, with which the boundary points can be determined. Different sections are fitted by Ran SAC algorithm,and the central axis can be obtained through that of each section. The automatic extraction experiment is done with the point cloud data of Shanghai tunnel, and it shows that this method is proven to be effective.
出处
《重庆建筑》
2016年第1期56-60,共5页
Chongqing Architecture
