顾及地物类型重要度的城市倾斜摄影模型轻量化算法  

Lightweight algorithm for urban oblique photography models considering the importance of terrain object types

作　　者：张洪玮 申申 范虹[1] 阮文阳 ZHANG Hongwei;SHEN Shen;FAN Hong;RUAN Wenyang(School of Computer Science,Shaanxi Normal University,Xi′an 710119;Beijing Aerospace Institute for Metrology and Measurement Technology,Beijing 100076,China)

机构地区：[1]陕西师范大学计算机科学学院,陕西西安710119 [2]北京航天计量测试技术研究所,北京100076

出　　处：《地理与地理信息科学》2025年第2期10-16,46,共8页Geography and Geo-Information Science

基　　金：陕西省自然科学基金重点项目“基于视频行为识别的课堂教学行为分析及应用研究”(2022ZJ-39);法医遗传学公安部重点实验室开放课题“面向混合DNA图谱拆分的STR数据集建立研究”(2023FGKFKT01);北京市现场物证检验工程技术研究中心开放课题“混合STR图谱拆分理论研究”(2024CSEEKFKT06)。

摘　　要：近年来城市倾斜摄影模型已广泛应用于城市规划等领域,但因数据量巨大易造成模型应用困难,且现有简化方法面对具体应用需求尚不能针对不同地物灵活调整简化比例。该文提出顾及地物类型重要度的城市倾斜摄影模型网格简化算法,并以一个重点关注建筑物对象的城市场景为例,基于具有语义信息的城市倾斜摄影数据集,对该算法与Quadric Error Metrics(QEM)算法、结构感知网格简化算法(SAMD)、鲁棒的通用三维模型低多边形网格生成方法(RoloPM)开展对比实验。结果表明,当整体简化比例相同(70%和85%)时,该算法对重点地物的简化结果在视觉效果、几何相似性以及简化效率方面均优于对比算法,可以满足实际应用中灵活简化大场景城市倾斜摄影模型的需求。The existing urban oblique photography models cannot flexibly adjust the simplification ratio according to the specific simplification requirements of terrain objects with different importance.Therefore,designing an effective lightweight algorithm for the models has become a critical issue.This paper proposed a mesh simplification algorithm for urban oblique photography models considering the importance of terrain object types.Taking an urban scene focusing on buildings as an example,based on the urban oblique photography dataset with semantic information,the proposed algorithm was compared with the quadric error metrics(QEM)algorithm,the structure-aware mesh decimation(SAMD)algorithm,and the robust low-poly meshing for general 3D models(RoloPM).The results show that when the overall simplification ratio is the same(70%and 85%),the proposed algorithm outperforms the others in terms of visual quality,geometric similarity,and simplification efficiency for key features,which can meet the needs of flexible simplification of large-scene urban oblique photography models in practical applications.

关 键 词：城市倾斜摄影 模型轻量化 网格简化 地物类型 QEM算法 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] P208[自动化与计算机技术—计算机科学与技术]