利用非抽样Contourlet变换的抗旋转攻击水印算法  

A digital watermarking method against rotation attack based on nonsubsampled Contourlet transform

作　　者：赵杰[1] 杨滨峰[1] 肖斌[2] 

机构地区：[1]商洛学院物理与电子信息工程系,陕西商洛726000 [2]西安电子科技大学计算机学院,西安710071

出　　处：《中国科技论文》2012年第7期523-528,共6页China Sciencepaper

基　　金：商洛学院科研基金资助项目(09SKY032;09SKY033)

摘　　要：对原始图像进行非抽样Contourlet变换得到不同尺度方向上的子带,利用该变换的多方向性和冗余性在特定子带上嵌入水印信息。为了平衡水印的不可感知性和稳健性之间的矛盾,依据人类视觉的感知特性自适应地嵌入水印。检测时使用基于相关的盲检测。为了提高变换域水印算法抵抗旋转攻击的能力,利用Radon变换和双谱分析来进行角度校正。实验结果表明,该算法在满足不可见性条件下对旋转、加噪、剪切和JPEG压缩等常见处理有较强的鲁棒性。The subbands in different scales and directions are obtained by image decomposition using the nonsubsampled Contourlet transfonn （NSCT）. The multidirectional and redundancy of NSCT is employed to embed the watermark in the special subbands. In order to eliminate the contradiction between imperceptibility and robustness, the watermark is adaptively embedded according to the human visual system. The blind detection is used based on correlation measurement. The ability against rotation attack is promoted by Radon Wansform and bispectral analysis. Experimental results show that the scheme is effective and has high robustness against common attacks such as rotation, adding noise, filtering, cropping and JPEG compression.

关 键 词：数字水印 非抽样CONTOURLET变换 自适应 角度校正 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]