摘要
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,实现了水印的自适应嵌入.实验表明,该方法对JPEG压缩、剪切和噪声攻击有一定的抵抗力,具有较好的鲁棒性和安全性.
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.
出处
《河南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第3期157-161,共5页
Journal of Henan Normal University(Natural Science Edition)
基金
河南省教育厅自然科学研究指导计划项目(2008B510010)
关键词
数字水印
混沌序列
离散小波变换
鲁棒性
digital watermark
chaotic sequences
discrete wavelet transform
robustness
