基于圆柱多段拟合的隧道中轴线提取方法研究

摘要

In order to get accurate 3D geometric information of the tunnel,the extraction of the central axis of the tunnel plays a key role.Firstly,the data of the tunnel point cloud are pretreated and divided into different sections according to the direction of the tunnel.Then,the less accurate central axes are extracted according to the vertical relationship between the axes and normal line of the surface point cloud.Finally,the more accurate axis is extracted by using cylindrical multi-segment fitting.The experimental results show that the proposed method has good applicability to straight and curved circular tunnels,and the algorithm is reliable and accurate.%提出基于圆柱多段拟合的隧道中轴线提取方法.首先对隧道点云数据进行预处理,并将点云按隧道走向分成不同区段;然后对各区段依据轴线与表面点云法线垂直关系,提取精度较低的中轴线;最后对各区段利用圆柱多段拟合,提取精度较高的中轴线.实验表明,隧道中轴线的提取在一定的采样区间具有较高的稳定性,对直线和弯曲的圆形隧道有良好的适用性,算法可靠,精度较高.