用于矢量地图完整性验证的脆弱数字水印算法

分析了矢量地图内容完整性认证的常用方法及矢量地图数字水印研究现状，提出将矢量地图分块，以数据块为计算单位，将水印信息嵌入在矢量地图数据中，不仅能验证矢量地图的完整性，还能将篡改的定位能力精确到数据块，嵌入了水印信息的矢量地图仍有使用价值，在对数据精度要求极高的情况下，可以通过数据完整性验证提取出原始矢量地图数据，更好地满足一些特殊应用的需求。

Fragile digital watermark used to verify integrity of vector map

The method of integrity authentication for vector maps are described at fist,then digital watermarking for vector digital are introduced.Finally, a fragile watermarking algorithm for vector maps is proposed,which is based on that the vector map is divided into a series of smaller subareas,and watermarking information is embedded in this subareas.The extraction procedure not only verifies integrity of the watermarked vector map,but also locates modification.The watermarked vector map can be used for its data that has been modified slightly, and the original vector map can be restored by extraction procedure for special application.