基于超混沌的图像零水印算法

Research on zero watermarking algorithm for hyper-chaos-based image

针对已有的零水印算法鲁棒性差、安全性低的问题进行了研究,提出了一种基于超混沌的图像零水印算法,首先利用Chen三维超混沌系统对水印信息进行加密预处理,通过解析各个位平面在分解后对图像的影响,将载体图像中的最低有效位初始化为零;采用块均值二值量化的方法进行特性提取;最后通过对加密水印与Anorld置乱后的特征矩阵进行异或处理得到零水印。仿真攻击实验及与以往零水印算法对比表明,该算法在保持鲁棒性良好的同时,能够抵御噪声、滤波、压缩、剪切等多种攻击。

Aiming at the low computation efficiency and poor security of the existing zero watermarking algorithm,this paper proposed a zero watermark algorithm based on hyperchaotic system.Firstly,the algorithm realized the encryption pretreatment of watermarking information taking advantage of the large key space and sensitivity of initial value of the Chen hyper-chaos system.And then it analyzed the influence of each bit plane on the image,it initialized least significant bit of the image carrier to zeros to extract the feature matrix using of block mean binary quantization method.Finally,it executed Arnold scrambled characteristics matrix and hyper-chaotic encrypted binary watermarking for xor operation to construct a zero watermarking.The si-mulation attack experiment and comparison with the precious zero watermark algorithm show that this algorithm can resist noise attack,filter attack,compression attack and shear attack while maintaining better robustness.