一种矢量地图无损数字水印技术

 在保证对数字矢量地图内容无损的前提下,提出一种基于编码压缩方案的高容量数字水印算法.根据数字矢量地图的文件组成结构,将水印信息隐藏于地图结点的属性数据块内.由于每个属性定义块都保留了冗余空间,在这些冗余空间内嵌入的水印信息不被任何地图编辑工具阅读或显示,水印标识因而具有很好的隐蔽性.实验表明在保持高容量和不可见性的前提下,算法对地图剪切,投影等几何变换,以及格式转换等操作都有很好的抵抗性能.

Lossless Digital Watermarking Technology for Vector Maps

In ensuring the content of digital vector maps lossless,a high-capacity digital watermarking algorithm is proposed based on encoding scheme.According to the structure of TAB file for digital vector maps,the watermark is hidden into the attribute blocks.As each vector object definition reserves redundant space,these information bits cannot be edited and displayed by any map editing tool,the watermark has good concealment.Experimental results show that the algorithm maintaining high capacity and good invisibi...