复合NSCT分解DCT变换和SVD分解的多重变换水印  

Multiple transform domain watermarking algorithm based on NSCT decomposition DCT transform and SVD decomposition

作　　者：赵勇[1] 熊顺清[1] 袁莎[1] 夏薇[1] 周卫红[1] 

机构地区：[1]云南民族大学数学与计算机科学学院,昆明650504

出　　处：《计算机工程与应用》2013年第20期167-170,共4页Computer Engineering and Applications

基　　金：云南省教育厅科研基金资助项目(No.2011J049);云南民族大学青年基金项目(No.11QN08)

摘　　要：为了提高水印的抗旋转攻击鲁棒性,加大水印的嵌入量,提出了一种基于非采样Contourlet变换(NSCT)和离散余弦变换(DCT)结合的双重变换域水印算法。对图像进行NSCT变换,将低频系数进行DCT变换,对DCT域低频系数进行奇异值分解(SVD)。经仿真实验表明,该算法对常规滤波、旋转有很好的鲁棒性,特别面对旋转攻击时,算法仍能很好地提取出水印信息。This paper proposes a new algorithm based on Nonsampling Contourlet Transform （NSCT） and Discrete Cosine Transformation （DCT） to improve the watermarking＇ s anti-rotation attack robustness and the embedding quantity. It transforms the image with NSCT, then does the low-frequency coefficients with DCT, decomposes the low-frequency coefficients of DCT domain with Singular Value Decomposition（SVD）. Experimental results show that the algorithm has a good robustness in filter and rotation, and extracts the watermarking very well in rotation attack especially.

关 键 词：数字水印 奇异值分解 离散余弦变换 非采样CONTOURLET变换 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]