基于混沌系统的数字水印加密算法研究

J4 ›› 2013, Vol. 35 ›› Issue (12): 126-133.

基于混沌系统的数字水印加密算法研究

吴静，景凤宣，齐富民

（贵州师范大学贵州省信息与计算科学重点实验室，贵州贵阳 550001）

收稿日期:2013-08-07 修回日期:2013-10-11 出版日期:2013-12-25 发布日期:2013-12-25
基金资助:
贵州省科学技术基金资助项目（黔科合J字LKS［2010］37号])；贵州师范大学2012年度自然科学类学生科研基金重点项目(201318)

Digital watermarking encryption
algorithm based on chaotic system

WU Jing,JING Fengxuan,QI Fumin

(Key Laboratory of Information and Computation Science,Guizhou Normal University,Guiyang 550001,China)

Received:2013-08-07 Revised:2013-10-11 Online:2013-12-25 Published:2013-12-25

摘要/Abstract

摘要：

针对目前大多数图像数字水印鲁棒性不强以及安全性较弱等问题，提出了基于多因子加密和Contourlet变换的图像数字水印算法。利用Chebyshev映射良好的伪随机性、数学统计特性及生成序列简单快捷等优点产生三个混沌序列，其中两个用于对水印图像加密，另外一个作为水印嵌入的密钥；利用Contourlet变换提取出原始载体和加密后水印的子带系数，再将水印的系数嵌入原始载体的系数中，完成水印嵌入。将提出的水印算法与其他文献中的方法进行鲁棒性和安全性比较，结果表明，提出的算法在具有较强的鲁棒性和安全性的同时，数字水印的不可见性也得到较好的均衡。

关键词: 数字水印, 混沌加密, Chebyshev映射, Contourlet变换

Abstract:

Aiming at the issues that robustness and security of most image watermarking are not strong，a digital watermarking algorithm based on multifactor encryption and Contourlet transform is proposed. Using the good pseudo randomness and mathematical statistical characteristics and the advantages of simple and quickly generated sequences of Chebyshev map, three chaotic sequences are produced. Two of them are used to encrypt the watermarking image, the left one is used as watermarking embedded keys; The Contourlet Transform is used to extract the subband coefficients of the original carrier and the encrypted watermark, then the coefficients of the watermark is embedded into the coefficients of the original carrier, thus accomplishing the watermark embedding process. The method is implemented and experiments are performed to compare the proposed method with other methods in literatures. The result shows that the algorithm owns better effect on robustness, security and invisibility.

Key words: digital watermark;chaotic encryption;Chebyshev mapping;Contourlet transform

吴静，景凤宣，齐富民. 基于混沌系统的数字水印加密算法研究[J]. J4, 2013, 35(12): 126-133.

WU Jing,JING Fengxuan,QI Fumin. Digital watermarking encryption
algorithm based on chaotic system [J]. J4, 2013, 35(12): 126-133.

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