基于超混沌和DCT理论的数字图像水印算法

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问的相关性,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.

A Digital Image Watermarking Algorithm Based on Hyperchaos and DCT Theory

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 encryption for strengthening the security of the watermarking. At the same time, according...