基于正交小波及其球形波的三维地形绘制算法  

Rendering Algorithm of 3D Terrain Based on Orthogonal Wavelet Transformation and Globular Wave

作　　者：刘水强[1] 陈继业[1,2] 张颖[3,4] 李桂梅[5] 

机构地区：[1]邵阳学院网络信息中心,中国邵阳422000 [2]国防科技大学理学院,中国长沙410073 [3]湖南大学电气与信息学院,中国长沙410082 [4]长沙理工大学网络中心,中国长沙410076 [5]湖南商学院计算机与电子工程学院,中国长沙410205

出　　处：《湖南师范大学自然科学学报》2008年第4期52-57,共6页Journal of Natural Science of Hunan Normal University

基　　金：湖南省科技计划课题资助项目(06CK3047);湖南省教育厅重点资助项目(06A066)

摘　　要：根据地形高程模型(DEM)的数据结构的特点,阐述基于正交小波方法进行分析处理的可行性,并得到提取多尺度地形数据基本特征.通过小波系数来表达低频概貌和高频细节,生成多尺度地形数据的方法,区别其他阈值选择策略,首次以球形波物理模型得出阈值选择计算公式,设计了渐进重构不同细节的地形网格规则,通过实验验证了该方法解决多块不同分辨率模型的无缝拼接问题的高效性和可行性.Analyzied the feasibility of processing data by using the orthogonal wavelet transformation, according to the characteristics of the data structure of multidimensional terrain DEM（ digital elevation model） and we get the basic features of multiscale terrain data, then we get the method of extracting and analyzing the multiscale terrain data using the wavelet coefficient to show the LF（low-frequency） profile and HF details. Also, the globular wave model is used to obtain the algorithm of threshold choice for the fist time and this threshold choice strategy is lifferent from other＇s. Here, a kind of gradual remodeling rule is designed for differently-detailed terrain mesh. As the result demonstrated, in solving the spliced seamless problems which are based on a lot different mutiresolusion models, the continuous muhiscale analysis effect has been achieved and the requirement of real-time rendering has been met.

关 键 词：正交小波 连续多尺度分析 阈值 球形波 地形绘制算法 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TP309[自动化与计算机技术—计算机科学与技术]