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  1. (1. 西安电子科技大学 计算机网络与信息安全教育部重点实验室, 陕西 西安 710071;
    2. 西安电子科技大学 电子工程学院, 陕西 西安 710071)

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2004-10-20 发布日期:2004-10-20

Copyright protection of the vector map using the digital watermark

LI Yuan-yuan1;XU Lu-ping1,2


  1. (1. Ministry of Education Key Lab. of Computer Network and Information Security, Xidian Univ., Xi'an 710071, China;
    2. School of Electronic Engineering, Xidian Univ., Xi'an 710071, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2004-10-20 Published:2004-10-20

摘要: 提出一种在矢量地图中嵌入水印的算法,对地图按坐标平均分块,根据每块顶点密度的分类对水印的强度进行自适应调制,然后在地图的精度允许范围内,采用改变顶点坐标值的方法将二值水印图像重复嵌入到地图中,并且通过双门限联合检测提取水印.该算法能够在保证地图的精度的同时,有效地增强水印的强度.实验证明该算法具有良好的鲁棒性.

关键词: 数字水印, 矢量地图, 地理信息系统(GIS), 版权保护, 双门限联合检测

Abstract: An algorithm for watermarking of the vector map is presented. We lay a rectangular grid over the map; according to the classification of density of vertices in each block we modulate the intensity of watermark adaptively, in the tolerance of the coordinates, and a two-value watermark image is embedded repeatedly by displacing the coordinates of vertices. When extracting the watermarks double-threshold combinative detection is used, the proposed algorithm can enhance the intensity of watermarks and ensure the precision and usability of the map. Experimental results show that this algorithm is robust to some processing.

Key words: digital watermarking, vector map, GIS, copyright protection, double-threshold combinative detection


  • TP309