混沌加密和NSCT图像数字水印算法研究

以非抽样Contourlet变换（NSCT）为基础,提出了一种新的抗攻击的鲁棒数字水印算法。使用混沌置乱和混沌加密处理水印信息,增强数字水印的安全性,同时提升了水印抗剪切等攻击的能力。将水印按照规则嵌入NSCT的低频子带,水印的不可见性和鲁棒性得到了较好的平衡。实验结果表明,本文提出的方法具有较好的安全性、鲁棒性和不可见性,能够有效地抵抗JPEG压缩、滤波、剪切等攻击。

Research on Image Watermarking Algorithm Using Chaotic Encryption and NSCT

A new robustness image watermarking algorithm based on chaotic encryption and nonsubsampled contourlet transform（NSCT） is proposed.Scrambling and encrypting the watermarking information using chaos to enhance the security of digital watermarking,while the anti-attack ability of shear and other attacks is improved.The watermarking embedded in low-frequency subband of NSCT by the rules,and the invisibility and robustness of watermarking embedded was good balance.The experimental results show that the algorithm proposed in this paper has good security,robustness and invisibility,and it can effectively resist the JPEG compression,filtering,cropping and other attacks.