隧道三维点云孔洞修复方法

摘要

Due to the hole in tunnel 3D laser scanning point cloud ,this paper designs a hole-filling method based on cross-sections .Tunnel is narrow and the cross-sections are similar ,so the nearby intact cross-sections can be used to repair the hole .First of all ,this paper changes 3D laser scanning point cloud into 2D by cylindrical projections and then comes up with a method to recognize the hole after constructing the Delaunay triangles .Finally ,because the nearby cross-sections are similar ,the hole is repaired with the nearby cross-sections .This method can not only repair the hole effectively ,but also keep tunnel detail structure without destroyed .The effectiveness and reliability of this method are verified with the scanning data form a real tunnel .%针对隧道三维激光扫描点云中的孔洞,设计一种基于断面轮廓的孔洞修复方法.隧道具有深长性与截面恒定性两大特征,文中基于这两大特征,利用间邻稳定轮廓拟合完整隧道修复孔洞.该方法能够对三维激光扫描点云进行圆柱投影,利用Delaunay三角构网,提出基于隧道表面三角网的孔洞识别方法,最后根据相邻隧道轮廓相似的特点,利用相邻的轮廓对孔洞进行修复.该方法能很好的修复孔洞并保留隧道结构细节,并以真实的隧道扫描数据验证算法的有效性和可靠性.