一种自适应的数字栅格地图可见水印算法  

Adaptive Visible Watermarking Algorithm for Digital Raster Map

作　　者：朱长青[1,2] 符浩军[2,3] 缪剑 王玉海 

机构地区：[1]南京师范大学虚拟地理环境教育部重点实验室 [2]信息工程大学地理空间信息学院 [3]61363部队

出　　处：《测绘学报》2013年第2期304-309,316,共7页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(41071245)

摘　　要：基于数字栅格地图的数据特性,运用小波变换工具,结合人类视觉系统特征,提出一种自适应的数字栅格地图可见水印算法。首先,对可见水印信息进行扩展等预处理;然后通过计算数字栅格地图的视觉重要区域来选择水印嵌入位置,水印嵌入位置由人类视觉系统特征和地图数据特性共同决定;最后,将可见水印自适应地嵌入地图所选择嵌入区域的小波域中。对提出的水印算法进行了试验分析,结果表明,该算法不仅具有良好的抗差性,同时还较好地保持了可见水印和原地图的视觉特征,以一种更积极有效的方式保护了数字栅格地图的版权。A new adaptive visible watermarking algorithm for digital raster map is proposed based on wavelet transformation.The features of digital raster map and the characteristics of Human Visual System（HVS） are considered in the algorithm.Firstly,it is finished that the pretreatment of the watermark information such as extension.Then,the watermark embedding positions are selected,which are determined by both features of digital raster map and characteristics of HVS,by computing the visual significant region in digital raster maps.Finally,it is that the visible watermark is embedded into the wavelet domain of the chosen positions adaptively.Experiments are done to analysis the proposed algorithm and the results show that the algorithm not only has good robustness but also maintains the visible watermarks and keeps the visual characteristics of original map well.Therefore,the digital raster maps can receive more positive and effective protection in copyright.

关 键 词：数字栅格地图 可见水印 嵌入位置 小波变换 人类视觉系统 

分 类 号：P208[天文地球—地图制图学与地理信息工程]