防止纹理扭曲的倾斜摄影模型轻量化算法  

Lightweight algorithm for preventing texture distortion in oblique photogrammetry model simplification

作　　者：王彦海[1] 张宇昊 李成 陈树平 李恩阳 WANG Yanhai;ZHANG Yuhao;LI Cheng;CHEN Shuping;LI Enyang(College of Electrical&New Energy,China Three Gorges University,Yichang 443000,China;China Southern Power Grid Extra High Voltage Power Transmission Company Wuzhou Branch,Wuzhou 543002,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443000 [2]中国南方电网超高压输电公司梧州局,广西梧州543002

出　　处：《重庆理工大学学报（自然科学）》2024年第11期164-172,共9页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金项目(U22A20600,52079070);防灾减灾湖北省重点实验室开放基金项目(2022KJZ07)。

摘　　要：针对倾斜摄影模型网格简化后出现纹理扭曲的问题,基于二次误差度量(quadric error metrics,QEM)算法,提出一种防止纹理扭曲的倾斜摄影模型轻量化算法。该算法依据模型中各顶点的拓扑连接关系对顶点进行分类,对不同类型的顶点制定相应的折叠策略,引入顶点起伏度因子、纹理形变因子和顶点一环领域内三角形平均面积对QEM算法中的边折叠代价进行改进。实验结果表明,改进算法可以在高简化率下避免出现纹理扭曲现象,有效保持了模型的几何特征和纹理特征,相较于传统QEM算法,改进算法处理的模型最大误差、平均误差和均方差均分别至少降低了43.55%、52.50%和21.61%;在90%简化率的情况下,相较于带纹理模型的简化算法,改进算法处理的模型最大误差、平均误差和均方差分别降低了34.90%、10.61%和12.31%。To address the texture distortion after mesh simplification in oblique photogrammetry models,we propose a lightweight algorithm based on the quadratic error metric(QEM)algorithm.It categorizes vertices based on their topological connectivity within the model,and then formulates appropriate folding strategies for different vertex types.It also introduces vertex fluctuation factor,texture deformation factor,and average triangle area within a one-ring neighborhood of each vertex to enhance the edge folding cost in the QEM algorithm.Our experimental results show the improved algorithm effectively avoids texture distortion at high simplification rates,preserving both the geometric and texture features of the model.Meanwhile,it reduces the maximum error,average error,and mean square error of the processed model by at least 43.55%,52.50%and 21.61%respectively compared to those of the QEM algorithm.At a simplification rate of 90%,the algorithm lowers the maximum error,average error,and mean square error of the processed model by 34.90%,10.61%and 12.31%respectively compared to those of simplification algorithm for textured models.

关 键 词：倾斜摄影模型 二次误差度量算法 网格简化 纹理扭曲 模型轻量化 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]