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基于小波变换的图像自适应数字水印算法研究


摘 要:提出了一种基于小波变换的图像自适应数字水印算法。首先对水印图像作置乱处理;然后对原始图像进行小波分解,并根据人类视觉系统的特性,在小波分解的低频域中,采用邻域均值代替单个小波系数进行估计和量化的方法,将水印自适应地嵌入低频域小波系数中;最后对该算法进行了仿真实验。实验表明该算法对图像的各种常规处理都具有较好的鲁棒性,与邵亚非等人的水印算法相比,该算法在水印容量、不可见性、鲁棒性上有更大的协调性。
  关键词:数字水印; 小波变换; 人类视觉系统
  中图分类号:TP391 文献标志码:A
  文章编号:1001-3695(2010)03-1058-03
  doi:10.3969/j.issn.1001-3695.2010.03.070
  
  Research of image-adaptive watermarking algorithm
  based on wavelet transform
  
  LIU Tao1,2, XIAO Han2,3
  
  (1.College of Information Engineering, Zhengzhou University, Zhengzhou 450001, China; 2.Dept of Information Technology, Zhengzhou Teachers College, Zhengzhou 450044, China; 3.School of Remote Sensing & Information Engineering, Wuhan University, Wuhan 430079, China)
  
  Abstract:This paper proposed an image-adaptive watermarking algorithm based on wavelet transform. At first, scrambled a digital image used as watermark.Next,decomposed the original image by discrete wavelet transform,and in accordance with the characteristics of human visual system, wavelet decomposition in the low-frequency domain, used methods which average of adjacent domain instead of single wavelet decomposition coefficients to estimate and quantitative,adaptively embedded watermarking in wavelet coefficients of low-frequency domain. At last, the simulation experimental results show that the algorithm for a variety of conventional image processing has good robustness, compare with algorithm of Shao Ya-fei,et al,it has better coordination in watermarking capacity, invisibility, robustness. ......
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