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.
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.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2004年第5期719-723,共5页
Journal of Xidian University
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
Algorithms
Classification (of information)
Computer simulation
Copyrights
Digital watermarking
Geographic information systems
Image processing
Vectors
