基于DWT的DEM重点区域多分辨率伪装技术  

Research of DEM Multi-Scale Information Disguising Based on DWT

作　　者：陈令羽[1] 宋国民[1] 王乃科 徐齐[3] 

机构地区：[1]信息工程大学 [2]61206部队 [3]92117部队

出　　处：《测绘科学技术学报》2015年第2期202-206,共5页Journal of Geomatics Science and Technology

基　　金：国家自然科学基金项目(41101437;41371382)

摘　　要：在数据共享中,保护重要高程数据的信息安全十分重要,提出了一种针对DEM重点区域进行多分辨率伪装和分权限还原的信息保护方法。结合传统信息保护技术的特点,分析DEM数据重点区域多分辨率伪装的流程和特点,介绍了重点区域数据置乱以及原始数据高程漏洞填充等进行信息伪装的数据准备和预处理方法。结合DWT算法能够进行多分辨率分解的特点,实现了DEM重点区域的多分辨率信息伪装与还原。通过实验分析,证明了该方法的可行性,可以为不同权限的用户提供适当精度的高程数据,能够保证DEM数据特别是重点区域在存储和传输中的信息安全。In the process of data sharing, it is very important to make sure the information security of elevation data. A method was given for multi-scale information disguising and reduction for the key area of DEM. Analyzed the process and characteristics of DEM multi-scale information disguising, the data preprocessing was introduced including data scrambling and elevation hole filling. The method of multi-scale information disguising and reduction for the key area of DEM was realized based on the DWT according to its characteristic of multi-scale decomposition.This method was feasible through the experimental analysis, and could give appropriate precision data to different permissions users. This method was very effective, and could save the DEM information security in the process of storage and transmission.

关 键 词：数字高程模型 多分辨率伪装 数据置乱 漏洞填充 离散小波变换 

分 类 号：P208[天文地球—地图制图学与地理信息工程]