摘要
为了实现数字图像的版权保护,设计了一种基于双树复小波变换的抗几何攻击的数字水印算法:对水印图像进行三级双树复小波变换,提取特征并插值为特征矩阵,并且定义了一种新的距离向量用于相似性度量,使用特征矩阵对遭受几何攻击的图像进行参数估计。实验结果表明,该算法可用于对图像遭受的对称缩放、非对称缩放、旋转等几何攻击进行校正,确保水印嵌入与检测的同步。
To achieve the copyright protection of digital image, an image watermarking scheme based on DT-CWT （dual tree complex wavelet transform） resisting geometrical attacks is proposed. The watermarking image is decomposed by three levels DT-CWT. An Eigenmatrix is formed by interleaving the two results of filtering by scaling level ofthe coefficients. A new distance vector is also defined to measure the similarity. The Eigenmatrix is used to recover the attacked image by estimating the parameter when detecting the watermarks. Experimental results show that the scheme can well withstand such geometrical attacks as rotation, scaling and geometric synchronization problem between the watermark embedding and detection is overcomed.
出处
《计算机工程与设计》
CSCD
北大核心
2009年第13期3240-3243,共4页
Computer Engineering and Design
