水印图像的混沌置乱算法

利用混合光学双稳混沌序列的伪随机性和初值敏感性,提出一种用于数字水印中的水印图像置乱算法.该算法针对水印图像,没有使用过多的额外技术,所以算法的复杂度较低;因为混合光学双稳混沌序列的伪随机特性,所以图像置乱的效果比较理想;混沌序列对初值具有敏感性,因此提高了置乱算法的安全性,使水印的安全依赖于密钥,且只需1个密钥,不同于logistic混沌序列需2个密钥.在数字水印技术中使用这种置乱技术,可以有效抵抗例如剪切等集中式攻击,使水印更具鲁棒性.

Watermarking image scrambling algorithm based on chaotic sequence

Using the sensitivity to the initial conditions and parameters of mixed-optical bistable chaotic sequence,we have a new scrambling algorithm about watermarking image.The algorithm have not extra technology and aim at watermarking image only,so it reduce the complexity of algorithm,and because of the random character of mixed-optical bistable chaotic sequence,the effect of scrambling is well.Chaotic sequence sensitive to the initial parameters,so algorithm is safe.The algorithm has only one key,so it is different to the algorithm based on logistic chaotic sequence.Using the scrambling technology in the watermarking,the algorithm can resist concentrated attack such as shearing,so it improves the robustness of watermarking.