基于混沌序列的DWT数字水印算法

为保证数字水印的安全性,提出了一种基于混沌序列的DWT水印嵌入算法,在嵌入前用混沌序列对水印图像进行预处理,首先由密钥生成混沌序列,然后将其映射为相应的置换矩阵,并在DCT域完成对水印图像的加密;根据宿主图像小波变换后,高、低频分量的特点,由高频分量的系数控制水印的嵌入强度,在低频部分嵌入加密的水印信息,实现了水印的自...

A DWT Digital Watermarking Algorithm Based on Chaotic Sequences

In this paper,a DWT digital watermarking algorithm based on chaotic sequences is proposed.The watermark is encryped by chaotic sequences before embedded into the original image.First,the chaotic sequences is generated by the key value.Then it is mapped into the corresponding permutation matrix.Finally,the watermark is completed encryption in DCT domain.According to the different characteristics of the frequency components of the original image with DWT,the encrypted watermark is embedded in the low frequency components whose strength is self-adaptively controlled by the coefficient of the high frequency components.The experimental results indicate that the algorithm is capable of resisting some common attacks such as JPEG compression,noise and cropping,which is of better robustness and security.