基于M进制小波的视点相关多分辨率地形模型的简化  

Simplification of View-dependent Multi-resolution Terrain Model by M-band Wavelet

作　　者：张立强[1] 杨崇俊[2] 刘冬林[2] 

机构地区：[1]北京师范大学遥感科学国家重点实验室,北京100101 [2]中国科学院遥感应用研究所,北京100101

出　　处：《系统仿真学报》2004年第9期1970-1973,1977,共5页Journal of System Simulation

基　　金：中欧水灾决策支持系统(ANFAS);国家自然科学基金(40071065)

摘　　要：在地形可视化领域,DEM和正射影像是主要的数据来源,它们都可看作是表示地形信息的二维信号。多进制小波是直接对标准二进制小波的综合,广泛应用于信号处理和影像压缩处理等领域。本文首先论述了多进制小波分析的原理,提出了在不同的视线高度下,利用不同进制的小波对DEM和影像实时压缩,构建与视点相关的动态多分辨率地形模型。结果表明,该算法具有压缩比高,压缩速度快,保真性好等优点,并且解决了不同尺度地形子块间的“裂缝”问题,满足了大规模DEM和影像实时无缝漫游的要求。In the field of terrain visualization, DEM and orthography are the main data source, and Regular Grid Digital Elevation Model and orthophotograph may be seen as the terrain’s 2-dimension signal. The M-band wavelet decomposition, a direct generalization of the standard 2-band wavelet decomposition has been applied to the problems of processing signals and compressing images. In this paper, the principles M-band wavelet analysis is discussed,Experimental results show that the algorithm has such good qualities as high compression ratio, high compression speed and less error value,etc.It also covers the ‘crack’ caused by the neighboring different resolution terrain blocks and can obtain fast, seamless visualization and animation of massive DEM, image data set in real time.

关 键 词：多进制小波 多分辨率地形模型 视相关 裂缝 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]