计算机工程与应用 ›› 2011, Vol. 47 ›› Issue (16): 201-203.

• 图形、图像、模式识别 • 上一篇    下一篇

非抽样Contourlet变换的低频数字水印

杨韫饴,王 玲   

  1. 湖南师范大学 物理与信息科学学院,长沙 410081
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-06-01 发布日期:2011-06-01

Low-frequency digital watermarking of nonsubsampled Contourlet transform

YANG Yunyi,WANG Ling   

  1. Physics and Information Science of Hunan Normal University,Changsha 410081,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-06-01 Published:2011-06-01

摘要: 非抽样Contourlet变换(NSCT)是一个平移不变、多尺度、多方向的变换,在图像处理中具有一定的优越性,提出一种基于非抽样Contourlet变换的数字水印算法,低频系数集中了图像的大部分能量,在低频嵌入水印可以提高鲁棒性,为了满足不可见性,对低频系数进行8×8的分块,根据每一块的能量以及人类视觉特性进行自适应的嵌入水印,实验结果表明算法具有很好的鲁棒性和不可见性,能够有效地抵抗JPEG、噪声等攻击。

关键词: 数字水印, 非抽样Contourlet变换, 平移不变, 鲁棒性

Abstract: The nonsubsampled Contourlet transform is a shift-invariant,multiscale,and multidirection transform,and has certain advantages in image processing.The watermarking algorithm is proposed based on the nonsubsampled Contourlet transform.The low-frequency coefficients concentrate the most energy of the image,embedding the watermarking in this area can increase the robustness.To meet the invisibility,it divides the low-frequency coefficients into 8×8 sub-blocks,adaptively embeds the watermarking according to the energy of each sub-blocks as well as human visual characteristic.Experimental results show that the algorithm has good robustness and invisibility,and effectively resists JPEG,noise attack.

Key words: digital watermarking, nonsubsampled Contourlet transform, shift-invariant, robustness