摘要
针对矢量地图频率域水印无法兼顾不可见性与水印容量的问题,该文提出一种改进的离散傅里叶变换(DFT)和快速响应(QR)码的矢量地图数字水印算法。该算法利用QR码作为水印信息的载体,通过QR码高荷载的能力提升水印信息容量。在水印嵌入时,对顶点坐标进行DFT变换后获取幅度值序列,设计了一种奇偶性判断规则,在嵌入强度可控的情况下,将二值QR码信息嵌入至DFT的幅度值序列中。实验结果表明,所提水印算法对平移、旋转等几何攻击有很好的鲁棒性,以QR码为载体实现了在频率域水印算法中高荷载水印信息的嵌入,且基于奇偶性规则嵌入的方式不仅实现了水印盲提取,对数据的干扰程度也很小。
In view of the problem that frequency domain watermark cannot balance the invisibility and information loading of watermarking,a vector map watermarking algorithm based on improved discrete Fourier transform(DFT)and quick response(QR)code was proposed.Firstly,the QR code,which has the high loading feature,was used as the carrier of copyright information and transformed into a binary sequence as the watermark information sequence.Then,the DFT transformation of vertex coordinate values were performed to obtain the magnitude value sequence,and the geometric invariance of DFT coefficients was used as the theoretical basis for the robustness of the watermarking algorithm.Finally,the parity judgment rule was used to embed the binary watermark sequence into the magnitude value sequence,and the inverse DFT transformation was used to obtain the watermarked vector maps.Experimental results showed that the proposed algorithm had good robustness to geometric attacks such as translation and rotation,and the embedding of highly loaded watermark information in the frequency domain watermarking algorithm was achieved by using QR codes,and the embedding method based on parity rules not only achieved blind extraction of the watermark,but also had minimal interference with the data.
作者
奚旭
张新长
鲍建腾
张亚洲
XI Xu;ZHANG Xinchang;BAO Jianteng;ZHANG Yazhou(School of Geography Science and Geomatics Engineering,Suzhou University of Science and Technology,Suzhou,Jiangsu 215009,China;School of Geography and Remote Sensing,Guangzhou University,Guangzhou 510006,China;Department of Water Resources of Jiangsu Province,Nanjing 210001,China;Jiangsu Taihu Planning and Design Institute of Water Resources Co.,Ltd.,Suzhou,Jiangsu 215009,China)
出处
《测绘科学》
CSCD
北大核心
2022年第10期190-197,共8页
Science of Surveying and Mapping
基金
国家自然科学基金项目(42101420,4207144)
苏州科技大学科研项目(332114801)
作者简介
奚旭(1990—),男,江苏溧阳人,讲师,博士,主要研究方向为地理信息安全与防护。E-mail:xixu2013@163.com;通信作者:张新长,教授,E-mail:eeszxc@mail.sysu.edu.cn
