基于超混沌和Slant变换的鲁棒水印算法

A robust watermarking algorithm based on hyper-chaotic and Slant transform

为进一步提高水印算法的安全性和抗攻击能力,结合超混沌和Slant变换的优点,提出一种基于超混沌和Slant变换的鲁棒水印算法。首先,在隐藏水印之前采用超混沌系统对水印图像进行加密,提高了待隐藏图像的安全性;其次,将原始载体图像划分成大小为8×8的不重叠分块并对各个分块分别进行Slant变换;最后,将加密后的水印图像隐藏到Slant变换后的直流系数和中频系数中。大量的仿真结果表明,本文算法具有较好的隐蔽性,对JPEG压缩、噪声、滤波、缩放、对比度调整等攻击具有较好的抗攻击能力。与相似算法相比,本文算法具有更好的鲁棒性能。

In order to improve the security and anti-attack ability of digital watermarking algorithm,combining the advantages of hyperchaos and Slant transform,a robust watermarking algorithm based on hyper-chaotic and Slant transform is proposed.Firstly,the watermarking image is encrypted by hyper-chaotic,which improves the security of the image to be embedded.Secondly,the original cover image is divided into non-overlapping blocks of size 8×8 and the Slant transform is performed on each block.Finally,the encrypted watermarking image is embedded into the DC coefficient and the middle frequency coefficient after Slant transform.A large number of simulation results show that the proposed algorithm has better transparency and robust performance for JPEG compression,noise,filtering,scaling,contrast adjustment and other attacks.Compared with the similar algorithms,the proposed algorithm has better robust performance.