基于自嵌入鲁棒双水印的图像认证算法

通过构造鲁棒零水印并鲁棒的嵌入到图像自身来实现完全盲检测的鲁棒水印方案,从而完成数字图像的全盲版权认证。首先利用整数小波变换构造鲁棒零水印:将原始图像进行三级整数小波变换,并将变换后获取的第三级低频子带(LL3)系数二值化来构造鲁棒零水印。然后利用一种基于奇异值分解(SVD,singular value decomposition)的鲁棒水印方案,将构造的鲁棒零水印嵌入到图像小波变换域低频子带(LL1)的分块奇异值分解的U矩阵的系数中。利用超混沌系统设计了随机置乱和加密方案。在鲁棒嵌入之前,先将二值零水印进行置乱分散并加密,增强了方案的鲁棒性和构造水印安的全性。实验结果证明了所提出的方案的有效性。

Self-embedding robust dual watermarking scheme for image authentication

A robust zero watermark is designed according to the original image and self-embedded into the original image to realize the blind authentication of digital images.The robust zero watermark is constructed with the coefficients after multi-level integer discrete wavelet transform(int-DWT for short)on the original image:Impose three level int-DWT on the original image to get the low frequency sub-band(LL3);then,transform coefficients of LL3 into a binary image as the zero watermark.After that,a robust watermarking scheme based on singular value decomposition(SVD for short)is proposed to embed the constructed zero watermark into the coefficients of U in the SVD on the low frequency sub-band(LL1).To improve the robustness and security of the whole scheme,the constructed zero watermark is permutated and encrypted thoroughly with a chaotic permutation and encryption that are designed with a hyper-chaotic system.Experimental results have demonstrated the validity and efficiency of the scheme.