矢量地图点数据的盲水印算法  

A blind watermarking algorithm for point layer of vector map

作　　者：曾端阳[1] 闫浩文[1] 张黎明 牛莉婷[1] 

机构地区：[1]兰州交通大学测绘与地理信息学院,兰州730070

出　　处：《测绘科学》2015年第3期123-126,25,共5页Science of Surveying and Mapping

基　　金：国家科技支撑计划项目(2013BAB05B01)

摘　　要：矢量地图点数据存储具有无序性。针对线数据的矢量地图水印算法不能直接应用于点数据的问题,该文提出了一种矢量地图点数据的盲水印算法。该算法将点数据的直角坐标转换为极坐标,自适应的划分扇形网格区域,并采用坐标映射与量化的方法嵌入水印信息。实验证明,该算法对裁剪、平移、删点、投影和坐标变换等操作,具有较好的鲁棒性,尤其是对裁剪操作,鲁棒性较强。The storage of the point layer of vector map is disorder,so algorithms for the line layer of vector map can not be directly applied to the point layer of vector map.A blind watermarking algorithm for point layer of vector map was proposed in the paper.Firstly the Cartesian coordinates of the point data were switched to polar coordinates,point layer was adaptively divided into sectorial grids,finally the watermark information was embedded by the coordinate mapping and quantitative methods.The experimental results showed that the algorithm would be robust on cropping graphic,translating data,deleting points,projection and coordinate transformation,etc.especially on cutting operation.

关 键 词：矢量地图 盲水印 极坐标 点数据 

分 类 号：P28[天文地球—地图制图学与地理信息工程]