顾及地物类别的倾斜摄影三维模型简化方法  

A simplification method for 3D model of oblique photography considering geographic categories

作　　者：兰峰 张帆[1,2] 高云龙 黄先锋[1,2] LAN Feng;ZHANG Fan;GAO Yunlong;HUANG Xianfeng(State Key Laboratory of Information Engineering Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China;Wuhan Daspatial Technology Co.,Ltd.,Wuhan 430223,China)

机构地区：[1]武汉大学测绘遥感信息工程国家重点实验室,湖北武汉430079 [2]武汉大势智慧科技有限公司,湖北武汉430223

出　　处：《测绘通报》2022年第4期44-50,共7页Bulletin of Surveying and Mapping

基　　金：国家重点研发计划(2020YFC1522703)。

摘　　要：基于倾斜摄影测量的三维建模已成为城市级实景三维建设的发展趋势。在城市三维模型中,由于植被表面不平整,需要用大量的三角面来刻画,但这并不是实景三维数据记录和表达的重点,并且大量的数据会给模型展示和应用带来很大的困难。因此,本文提出了一种顾及地物类别的倾斜摄影三维模型简化方法。首先,计算三维模型的纹理信息和几何信息,结合马尔可夫随机场(MRF)顾及空间一致性的优点提取植被;然后,采用二次误差测度(QEM)算法简化特定的植被区域;最后,对简化后的白膜模型进行纹理重映射。试验结果表明,本文方法能够准确提取并有效简化植被区域,纹理重映射的结果在外观上也与原始模型相差无几,取得了预期的良好效果。3D modeling based on oblique photogrammetry has become the development trend of 3D urban construction.The vegetations with uneven surface need a large number of triangles to depict in the urban model,but this is not the focus of 3D real scene data recording and expression,it is difficult to display and apply the model due to a large amount of data.So,this paper proposes a 3D model simplification method of oblique photography considering the types of ground objects.Firstly,vegetation area is extracted by using Markov random field(MRF)based on textural and geometric information.Then,the quadric error metrics(QEM)algorithm is used to simplify the vegetation area.Finally,the texture remap of the simplified white film model is performed.The experimental result shows that the method in this paper can extract and simplify the vegetation area effectively,the texture remap result is almost the same as the original model in appearance.The method proposed in this paper has achieved the desired result.

关 键 词：倾斜摄影测量 实景三维模型 植被提取 马尔可夫随机场 网格简化 

分 类 号：P23[天文地球—摄影测量与遥感]