一种顾及地形特征的规则格网DEM数字水印算法  

A Watermarking Algorithm of Grid DEM Considering Terrain Features

作　　者：王志伟 朱长青[2] 任娜[2] 

机构地区：[1]78131部队,四川成都610031 [2]南京师范大学地理科学学院虚拟地理环境教育部重点实验室,江苏南京210097

出　　处：《测绘科学与工程》2017年第6期69-73,共5页Geomatics Science and Engineering

摘　　要：提出了一种顾及地形特征的规则格网DEM数字水印算法。该算法充分考虑了规则格网DEM数据特点，通过地形特征因子的分析概括，在水印嵌入方案中，采用映射机制和量化调制机制，提出了具有针对性的水印嵌入策略和顾及坡度坡向特征的水印嵌入约束条件，并实现了相应的水印算法。实验结果表明，该算法能够有效减小DEM数据的坡度和坡向误差，能够以极小的误差代价获得较优的鲁棒性。A watermarking algorithm of grid DEM considering terrain features is proposed in this paper. Based on a full con- sideration of the characteristics of grid DEM data and the analysis and summarization of terrain feature factors, the mapping mech- anism and quantitative modulation mechanism are adopted in watermarking embedding scheme, specific strategy and constraints considering the features of slope aspect are proposed, and the corresponding watermarking algorithm is realized. Experiment re- suits show that the algorithm can effectively reduce the slope and slope error of DEM data, and obtain better robustness with mini- mal error.

关 键 词：规则格网DEM 地形特征 盲水印 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]