基于超混沌和DCT理论的数字图像水印算法  

A Digital Image Watermarking Algorithm Based on Hyperchaos and DCT Theory

作　　者：毕洪波[1] 张玉波[1] 王秀芳[1] 

机构地区：[1]大庆石油学院电气信息工程学院,黑龙江大庆163318

出　　处：《计算机仿真》2008年第10期161-163,共3页Computer Simulation

摘　　要：基于超混沌和离散余弦变换(DCT)理论,结合Arnold置乱方法,提出了新型的数字图像水印算法。采用双重加密策略,利用Arnold方法减弱水印图像像素之间的相关性,并采取srossler系统生成超混沌密钥序列,进行二次加密,大大增强了水印的安全性。同时,根据人类视觉系统(HVS)的特点,对原始图像进行分块处理,将加密后的水印分别以不同的强度嵌入并提取,给出了改进的嵌入提取方案。实验结果表明,提高了水印图像的不可见性和鲁棒性,具有极强的抗攻击性。Based on the hyperchaos and Discrete Cosine Transform （DCT） algorithm, and combined with the Arnold scrambling method, a novel digital image watermarking algorithm is proposed in this paper. The method adopts double encryption strategy, which makes use of Arnold method to weaken the correlation among the pixes of the watermark and adopts srossler system to generate the hyperchaotic key sequence to undertake the second eneryption for strengthening the security of the watermarking. At the same time, according to the characteristics of human vision system （ HVS）, the original image is splitted into blocks, and the watermarking encrypted is embedded and extracted with different strength, the improved imbedding and extraction scheme is presented. The experiment results show that the scheme improves the invisibility and robustness, and possesses strong anti -attack capability,

关 键 词：超混沌 离散余弦变换 图像水印 人类视觉系统 置乱 

分 类 号：TN911.73[电子电信—通信与信息系统]