计算机工程与应用 ›› 2013, Vol. 49 ›› Issue (20): 167-170.

• 图形图像处理 • 上一篇    下一篇

复合NSCT分解DCT变换和SVD分解的多重变换水印

赵  勇,熊顺清,袁  莎,夏  薇,周卫红   

  1. 云南民族大学 数学与计算机科学学院,昆明 650504
  • 出版日期:2013-10-15 发布日期:2013-10-30

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

ZHAO Yong, XIONG Shunqing, YUAN Sha, XIA Wei, ZHOU Weihong   

  1. School of Mathematics & Computer Science, Yunnan University of Nationalities, Kunming 650504, China
  • Online:2013-10-15 Published:2013-10-30

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。

关键词: 数字水印, 奇异值分解, 离散余弦变换, 非采样Contourlet变换

Abstract: 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.

Key words: digital watermarking, singular value decomposition, discrete cosine transformation, nonsampling Contourlet transform