| 基于DFT的自适应矢量地图水印算法 |
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| 引用本文： | 赵林,门朝光,曹刘娟.基于DFT的自适应矢量地图水印算法[J].应用科技,2009,36(7):47-50,65. |
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| 作者姓名： | 赵林 门朝光 曹刘娟 |
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| 作者单位： | 哈尔滨工程大学,高可信计算技术研究中心,黑龙江,哈尔滨,150001 |
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| 摘 要： | 提出一种在矢量地图中自适应嵌入水印算法．对地图按坐标分块，根据每块顶点密度和DFT（离散傅里叶变换）中频系数幅值大小对每个矩形块水印嵌入强度进行自适应调整，并在DFT变换中频系数幅值中嵌入水印信息．实验表明，该算法能够在保证矢量地图数据精度的同时，有效增强水印鲁棒性．
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| 关 键 词： | 版权保护 数字水印 矢量地图 DFT变换 |
DFT-based adaptive vector map watermarking algorithm |
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| ZHAO Lin,MEN Chao-guang,CAO Liu-juan.DFT-based adaptive vector map watermarking algorithm[J].Applied Science and Technology,2009,36(7):47-50,65. |
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| Authors: | ZHAO Lin MEN Chao-guang CAO Liu-juan |
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| Institution: | ( R＆D Center of High Dependability Computing Technology, Harbin Engineering University, Harbin 150001, China) |
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| Abstract: | An adaptive algorithm for a watermarking of a vector map is presented. By dividing the map into blocks, the intensity of watermark is modulated adaptively according to the density of vertices and the DFT （ discrete Fourier transformation） amplitude of middle frequency coefficients in each block, then the watermark is embedded in DFT middle frequency coefficients. Experimental results show that the algorithm can ensure the accuracy and enhance the robustness of the vector map. |
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| Keywords: | copyright protection digital watermarking vector map discrete Fourier transformation |
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