计算机应用 ›› 2011, Vol. 31 ›› Issue (11): 3056-3059.DOI: 10.3724/SP.J.1087.2011.03056

• 图形图像技术 • 上一篇    下一篇

基于人类视觉系统和离散小波变换的彩色图像水印

张亮亮1,2,陈秀宏1   

  1. 1. 江南大学 数字媒体学院,江苏 无锡 214122
    2. 江南大学 物联网工程学院,江苏 无锡 214122
  • 收稿日期:2011-05-24 修回日期:2011-07-01 发布日期:2011-11-16 出版日期:2011-11-01
  • 通讯作者: 张亮亮
  • 作者简介:张亮亮(1988-)，男，安徽蒙城人，硕士研究生，主要研究方向：数字水印；
    陈秀宏(1964-)，男，江苏泰兴人，教授，博士，主要研究方向：优化理论与方法、模式识别。

Color image watermarking based on human visual system and discrete wavelet transform

ZHANG Liang-liang1,2,CHEN Xiu-hong1   

  1. 1. School of Digital Media, Jiangnan University,Wuxi Jiangsu 214122, China
    2. School of Internet of Things, Jiangnan University, Wuxi Jiangsu 214122, China
  • Received:2011-05-24 Revised:2011-07-01 Online:2011-11-16 Published:2011-11-01
  • Contact: ZHANG Liang-liang

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摘要： 为了扩大数字水印的适用范围，提出一种基于人类视觉系统（HVS）和离散小波变换(DWT)的彩色图像数字水印算法。首先利用混沌加密算法把一个有意义的二值图像加密成水印;然后将彩色图像从RGB色彩空间转换到YCbCr空间，提取Y分量，对Y分量进行一级离散小波变换；最后求出低频分量LL1的视觉掩蔽值，根据视觉掩蔽值，将水印嵌入到彩色图像的Y分量的低频小波系数域上。实验结果表明，该算法具有较好的不可见性和鲁棒性。与以往的基于YCbCr颜色空间的算法相比，该算法具有更好的不可见性和鲁棒性。

关键词: 数字水印, 混沌理论, 人类视觉系统, 离散小波变换, 加密

Abstract: In order to extend the range of applying of digital watermarks,this paper introduced a watermarking algorithm for color image based on Human Visual System (HVS) and Discrete Wavelet Transform (DWT). First, a meaningful binary image was encrypted by chaotic encryption algorithm to form watermark. Then the color image was converted from RGB color space to YCbCr space; the Y component was extracted and one level discrete wavelet transform was executed. Finally, the visual masking value of LL1 was got. According to the visual masking value, the watermark was embedded into the low-frequency wavelet coefficient domains of Y components of color image. Experimental results show that the proposed algorithm has better invisibility and robustness than the algorithm based on YCbCr color space.

Key words: digital watermarking, chaos theory, Human Visual System (HVS), Discrete Wavelet Transform (DWT), encryption

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