一种基于平面分割的室内墙线提取方法  

An indoor wall line extraction method based on plane segmentation

作　　者：李琪琪 邹禄杰 蔡礼贤 Li Qiqi;Zou Lujie;Cai Lixian(Guangzhou Urban Planning&Design Survey Research Institute,Guangzhou 510060,China;Guangdong Enterprise Key Laboratory for Urban Sensing,Monitoring and Early Warning,Guangzhou 510060,China)

机构地区：[1]广州市城市规划勘测设计研究院,广州510060 [2]广东省城市感知与监测预警企业重点实验室,广州510060

出　　处：《工程勘察》2025年第4期66-71,共6页Geotechnical Investigation & Surveying

基　　金：广东省城市感知与监测预警企业重点实验室基金项目(2020B121202019)。

摘　　要：针对房间建模中的墙线提取问题,提出一种基于平面分割的室内墙线提取方法。首先将点云向竖直方向上投影并分层,利用点云高度数目直方图判断点云中存在的水平面个数;然后通过法向量约束的随机采样一致性方法有序且快速分割出天花板、地板等水平面以及墙面等竖直平面;接着根据平面参数获取直线并打断成固定长度的线段,作为备选墙线,将墙面点云向水平方向投影得到水平投影点云,根据水平投影点云和备选墙线的叠加筛选线段;最后经过交点处理、线段拼接和筛选即可得到最终的墙线。实验结果表明,添加法向量约束可以大大减少随机采样一致性方法分割平面的时间,相较基于图像霍夫变换的方法,本文方法具有更好的适用性,提取的墙线精度更高。Aiming at the problem of wall line extraction in room modeling,an indoor wall line extraction method based on plane segmentation is proposed.First projects the point cloud in the vertical direction and stratifies it,then it uses the point cloud height histogram to determine the number of horizontal planes in the point cloud;then it segments horizontal planes such as ceilings and floors,and vertical planes such as walls orderly and fast,through the RANSAC method constrained by the normal vector;then it obtains straight lines according to the plane parameters and breaks them into fixed-length line segments as alternative wall lines and projects the wall point cloud in the horizontal direction to obtain a horizontal projection point cloud.The line segments are filtered according to the superposition of the horizontal projection point cloud and the alternative wall line.Finally,the final wall line can be obtained after the intersection point processing,line segment splicing and screening.Experiments show that the addition of normal vector constraints can greatly reduce the time to segment planes by RANSAC method.Compared with the method based on the image Hough transform,the method proposed has better applicability and the accuracy of wall line extraction is higher.

关 键 词：室内点云 墙线提取 平面分割 法向量约束 随机采样一致性 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]