一种扇区投影和滑窗连线的特征提取方法  

A feature extraction method for sector projection and sliding window connection

作　　者：张兴岩 李琦 梁栋 蒲洁 ZHANG Xing-yan;LI Qi;LIANG Dong;PU Jie(School of Electronic Information Engineering,Hebei University of Technology,Tianjin 300401;School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401)

机构地区：[1]河北工业大学电子信息工程学院,天津300401 [2]河北工业大学土木与交通学院,天津300401

出　　处：《激光与红外》2023年第6期954-962,共9页Laser & Infrared

基　　金：国家自然科学基金(No.51978236);天津市交通运输委员会科技发展计划项目(No.201906)资助。

摘　　要：针对点云特征线提取中不均匀点、不明显特征点和特征线断裂的问题,提出了一种扇区投影和滑窗连线的特征提取方法。该方法首先对点云进行全局密度分析,计算平均点间距,然后采用扇区投影法统计扇区内邻近点的分布情况,由分布情况确定点云模型边界点,进而计算局部三角形法线,根据法线突变情况判断尖锐折边点,在扇区投影的基础上延伸局部探线,根据不同的探线类型制定判断非尖锐折边点的相关策略,最后基于滑窗连线的方法,将无序特征点有序连接,得到光滑特征线。实验证明,该方法可以较完整地提取模型的特征线,同时具有一定的抗噪能力。对比其他两种方法,本文方法对模型中的弱特征更敏感,提取效果相对较好。Aiming at the problems of uneven points,indistinct feature points and broken feature lines in point cloud feature line extraction,a feature extraction method based on sector projection and sliding window connection is proposed.Firstly,the global density of the point cloud is analyzed and the average point spacing is calculated;then,the sector projection method is used to count the distribution of adjacent points in the sector,and the boundary points of the point cloud model is determined from the distribution;in turn,the local triangle normal is calculated,sharp edge point is judged according to the normal mutation,the local probe line is extended on the basis of the sector projection,and the relevant strategy for judging the non-sharp edge point is formulated according to different probe line types;finally,based on the sliding window connection method,the unordered feature points are connected in an orderly manner to obtain smooth feature line.The experiments show that the method can extract the characteristic lines of the model relatively completely,and has a certain anti noise ability at the same time.Compared with the other two methods,the method in this paper is more sensitive to the weak features in the model and the extraction effect is relatively better.

关 键 词：特征线提取 平均点间距 扇区投影 局部探线 滑窗连线 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TN958.98[自动化与计算机技术—计算机科学与技术]