一种点云边界轮廓特征快速提取方法  

A method for fast extraction of point cloud boundary contour features

作　　者：蒲洁 雍正阳 李海凌 Pu Jie;Yong Zhengyang;Li Haiing(China Construction Eighth Engineering Bureau Limited Southwest Company,Chengdu 610051,China)

机构地区：[1]中国建筑第八工程局有限公司西南公司,成都610051

出　　处：《工程勘察》2024年第3期68-73,共6页Geotechnical Investigation & Surveying

摘　　要：边界轮廓线对建筑物快速建模和变形监测起着重要作用。针对三维点云边界轮廓特征提取不准确和时间复杂度高等问题,提出一种点云边界轮廓特征快速提取方法。首先,对点云数据进行改进体素化下采样;然后,八叉树体素化点云数据,以每个体素的外切球为单位,计算曲率描述子,对边界轮廓特征进行粗提取;最后,对粗提取的特征点计算每个点k邻域的最大主曲率,对边界轮廓信息进行精提取。对某桥大型拼装构件的试验结果表明,该方法不仅速度快,而且提取的边界轮廓线简洁、清晰、完整。Boundary contour lines play an important role in rapid building modeling and deformation monitoring.Aiming at the problems of inaccurate extraction of 3D point cloud boundary contour features and high time complexity,a fast method for extraction of point cloud boundary contour features is proposed.First,perform improved voxelization down-sampling on the point cloud data;then,build the octree point cloud data,use the circumscribed sphere of each voxel as a unit,calculate the curvature descriptor,and perform rough extraction of the boundary contour features;Finally,for the coarsely extracted feature points,the maximum principal curvature of the k neighborhood of each point is calculated,and the boundary contour information is extracted finely.The test results of a large-scale assembled component of a bridge show that the method is not only fast,but also the extracted boundary contour line is concise,clear and complete.

关 键 词：点云处理 特征提取 八叉树 曲率 下采样 

分 类 号：TN249[电子电信—物理电子学]