基于二维矢量地图属性特征的数字水印算法

摘要

针对空域和频域数字水印对矢量地图造成不同程度的精度损失以及抗压缩性能差的特点,提出了一种新的矢量地图数字水印算法.该算法利用矢量对象的属性特征构造水印信息,采用网格密度空间聚类方法选取特征结点,并通过对特征结点的二维坐标进行微调,将数字水印嵌入到地图属性文件中.实验和分析表明,该算法达到了矢量地图精度零损伤的目标,同时,提高了数字水印的鲁棒性和实用性.%Aiming at the problems that spatial domain watermarking and frequency domain watermarking of 2D vector maps cause precision losses and have the poor performance of anti-compression, this paper proposes a new digital watermarking algorithm for 2D vector maps. The algorithm uses the attribute-features of vector objects to construct watermarking information, selects characteristic nodes with the improved grid density clustering method, and embeds the watermark into the attribute files by tuning the coordinates of characteristic nodes. The experiments and analysis show that the algorithm can achieve the zero-loss goal in the precision of vector maps and enhance the robustness and availability of watermarking.