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图学学报 ›› 2022, Vol. 43 ›› Issue (5): 849-857.DOI: 10.11996/JG.j.2095-302X.2022050849

• 图像处理与计算机视觉 • 上一篇    下一篇

基于 SHOT 特征描述子的自动提取球形标靶方法研究 

  

  1. 河海大学地球科学与工程学院,江苏 南京 210098
  • 出版日期:2022-10-31 发布日期:2022-10-28
  • 基金资助:
    国网新源控股(水电)有限公司科技项目(SGXYKJ-2020-079) 

Research on automatic extraction of spherical targets based on SHOT feature descriptor  

  1. School of Earth Sciences and Engineering, Hohai University, Nanjing Jiangsu 210098, China
  • Online:2022-10-31 Published:2022-10-28
  • Supported by:
    State Grid Xinyuan (Hydropower) Company Ltd. Technology Project (SGXYKJ-2020-079) 

摘要:

针对复杂场景下的三维激光点云球形标靶精确自动化提取问题,提出了一种基于 SHOT 特征的 自动精确提取球形标靶的方法。该方法设计了粗提取和精提取处理过程,粗提取过程首先采用 SHOT 特征描述 子提取场景内全部的球形标靶点云;其次,利用欧氏聚类分割球形标靶点云,并采用最小二乘方法计算球形标 靶的粗略参数。精提取过程依据迭代最小二乘方法和法向滤波剔除非球面点,得到球形标靶点云和精确的球形 标靶参数。设计了含有 4 个球形标靶的实验场景,使用德国 Z+F Image 5016 扫描仪进行场景数据采集,自动 提取得到实验场景中的球形标靶点云和球形标靶参数。结果表明,在 10 m 范围内,该方法自动提取的球形标 靶半径中误差为 0.25~0.33 mm,较人工提取球形标靶点云的半径中误差减小 0.02~0.06 mm,较基于微分方法减 少 0.01~0.09 mm;该方法能够得到较高的球形标靶定位精度和稳健地去除场景点云中的噪声,可在 30 s 内完 成百万级点云球形标靶的自动提取任务。

关键词: 球形标靶点云, SHOT 特征描述子, 迭代最小二乘, 欧氏距离聚类, 法向滤波

Abstract:

To achieve the accurate automatic extraction of spherical targets from 3D laser point clouds in complicated scenes, a method was proposed for the automatic and accurate extraction of spherical targets based on SHOT features. This method designed the processes of rough extraction and refined extraction. In the rough extraction process, SHOT feature descriptor was utilized to extract all spherical target point clouds in the scene; secondly, Euclidean clustering was used to segment spherical target point clouds, and rough spherical target parameters was calculated using the least square. The refined extraction process was based on the iterative least squares method and normal filtering to eliminate the aspherical points, and obtain the spherical target point cloud and accurate spherical target parameters. An experimental scene with 4 spherical targets was designed. The German Z+F Image 5016 scanner was employed to collect the scene data, and the spherical target point cloud and spherical target parameters in the experimental scene were automatically extracted. The results show that in the range of 10 meters, the error of the radius of the spherical target automatically extracted by this method was 0.25–0.33 mm, which was 0.02–0.06 mm less than that of the manually extracted spherical target point cloud, and 0.01–0.09 mm less than that based on the differential method. The proposed method can achieve high positioning accuracy for spherical targets and robustly eliminate noise in the scene point cloud, and can complete the automatic extraction of spherical targets with millions of point clouds within 30 seconds. 

Key words:  , spherical target point cloud, SHOT feature descriptor, iterative least squares, Euclidean distance clustering, normal filtering 

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