摘要
目前,在某一数字产品中仅仅嵌入一种水印已经不能满足人们的要求,在很多情况下,人们需要的是多重水印或多功能水印。本文基于混沌动力系统良好的随机性和初值敏感性,提出了一种空域和DCT域相结合的针对彩色图像的多功能数字水印算法,该算法在彩色图像的蓝色分量中基于混沌随机密钥和LSB技术重复分块嵌入了一幅半脆弱水印,以实现完整性认证及篡改检测,同时分别在红色分量DCT直流系数(DC)中和绿色分量DCT中频系数中各由混沌密钥控制随机嵌入一幅鲁棒水印,这些水印完成版权认证、附加信息检测等。实验结果表明,该算法较好地实现了多功能水印技术。
Nowdays embedding only one kind of watermark in digital products can not satisfy people＇s demand any more,and the multiple or muhifunctional watermarks are required in many situations. A space and the DCT field combined watermarking algorithm for color images based on the good randomicity and the initial value sensitivity of chaotic dynamical systems is proposed in this paper. In the algorithm, a fragile watermark based on chaotic random keys and the LSB tech- nique is repeatedly embedded in the blue layer of the color image, which is used for integrality authentication and sophistication detection. At the same time, two robust watermarks are respectively embedded in the red layer＇s direct current （DC） coefficients and in the green layer＇s intermediate frequency coefficients of the image＇s DCT field. These watermarks are used for the copyright authentication and appended information detection, etc. The experimental results show that the algorithm can well realize the multifunctional watermarking method.
出处
《计算机工程与科学》
CSCD
北大核心
2009年第12期44-48,共5页
Computer Engineering & Science
关键词
混沌
置换群
多功能水印
多重水印
鲁棒水印
脆弱水印
chaos
permutation group
multifunctional watermarking
mulriple watermarking
robust watermark
fragile watermarking
