摘要
设计了一个基于DCT的数字地图水印算法。算法首先提取地图数据的特征点,组成特征图像。然后对特征图像作离散余弦变换,把水印信息嵌入在中低频系数上。实验表明,所提算法是高效、安全、鲁棒的。
A digital map watermarking algorithm based on discrete cosine transform（DCT） is presented. First, character image were generated using characteristic points, which were took out from map data. Then DCT was implemented on character image, and the watermarking was embedded into the block middle-frequency and low-frequency DCT coefficients. The experimental resuhs show that the algorithm is fairly good in efficiency and security.
出处
《计算机应用与软件》
CSCD
北大核心
2007年第1期146-148,174,共4页
Computer Applications and Software
关键词
数字地图
特征图像
离散余弦变换
数字水印
Digital map Character image Discrete cosine transform Digital watermarking
