基于结构特征保持的QEM简化算法  

QEM simplification algorithm based on structural feature preservation

作　　者：李成林 贺鹏飞[1] 马建飞 张桐敬 聂荣[3] Li Chenglin;He Pengfei;Ma Jianfei;Zhang Tongjing;Nie Rong(School of Physics and Electronic Information,Yantai University,Yantai 264005,China;Huaneng Shandong Power Generation CO.LTD,Yantai Power Plant,Yantai 264002,China;School of Intelligent Engineering,Zhengzhou Aviation Industry Management College,Zhengzhou 450046,China)

机构地区：[1]烟台大学,物理与电子信息学院,山东烟台264005 [2]华能山东烟台发电有限公司烟台发电厂,山东烟台264002 [3]郑州航空工业管理学院,智能工程学院,郑州450046

出　　处：《工程勘察》2023年第11期47-51,68,共6页Geotechnical Investigation & Surveying

基　　金：烟台市2021年校地融合发展项目(1521001-WL21JY01);2022年河南省科技攻关项目(222102220048).

摘　　要：随着三维可视化城市的发展,场景中各个层次细节模型的简化要求越来越高。针对传统QEM三维模型简化算法不能保持复杂模型结构特征的问题,提出一种改进算法,该算法优先进行平面过滤和保结构收缩处理,对平面网格进行降噪的同时增强尖锐的边缘特征;通过顶点邻接的三角形面元围成的四面体体积的平方和确定最小收缩代价,并设置点对距离阈值优化简化效率。实验结果表明,该算法很好地保留了模型的细节结构特征和简化后模型的整体外观,在包含多元素的复杂场景简化中可得到有效应用。With the development of 3D visualization cities,the simplification of detailed models at various levels in the scene is increasingly required.An improved algorithm is proposed for the problem that the traditional QEM 3D model simplification algorithm cannot maintain the structural features of complex models.The algorithm prioritizes planar filtering and structure-preserving shrinkage processing,and enhances sharp edge features while noise reduction is performed on planar meshes;the minimum shrinkage cost is determined by the sum of squares of tetrahedral volumes enclosed by triangular face elements adjacent to vertices,and a point-to-distance threshold is set to optimize the simplification efficiency.The experimental results show that the algorithm well preserves the detailed structural features of the model and the overall appearance of the simplified model,and is effectively applied in the simplification of complex scenes containing multiple elements.

关 键 词：网格简化 平面过滤 保结构 三维可视化 

分 类 号：P234[天文地球—摄影测量与遥感]