Automatic Extraction Method of 3D Feature Guidelines for Complex Cultural Relic Surfaces Based on Point Cloud  

作　　者：GENG Yuxin ZHONG Ruofei HUANG Yuqin SUN Haili 

机构地区：[1]College of Resources Environment and Tourism,Capital Normal University,Beijing 100048,China [2]Key Laboratory of 3-Dimensional Information Acquisition and Application,Ministry of Education,Beijing 100048,China [3]Chinese Academy of Cultural Heritage,Beijing 100029,China

出　　处：《Journal of Geodesy and Geoinformation Science》2024年第1期16-41,共26页测绘学报（英文版）

基　　金：National Natural Science Foundation of China(Nos.42071444,42101444)。

摘　　要：Cultural relics line graphic serves as a crucial form of traditional artifact information documentation,which is a simple and intuitive product with low cost of displaying compared with 3D models.Dimensionality reduction is undoubtedly necessary for line drawings.However,most existing methods for artifact drawing rely on the principles of orthographic projection that always cannot avoid angle occlusion and data overlapping while the surface of cultural relics is complex.Therefore,conformal mapping was introduced as a dimensionality reduction way to compensate for the limitation of orthographic projection.Based on the given criteria for assessing surface complexity,this paper proposed a three-dimensional feature guideline extraction method for complex cultural relic surfaces.A 2D and 3D combined factor that measured the importance of points on describing surface features,vertex weight,was designed.Then the selection threshold for feature guideline extraction was determined based on the differences between vertex weight and shape index distributions.The feasibility and stability were verified through experiments conducted on real cultural relic surface data.Results demonstrated the ability of the method to address the challenges associated with the automatic generation of line drawings for complex surfaces.The extraction method and the obtained results will be useful for line graphic drawing,displaying and propaganda of cultural relics.

关 键 词：point cloud conformal parameterization vertex weight surface mesh cultural relics feature extraction 

分 类 号：P208[天文地球—地图制图学与地理信息工程]