基于SVD-DWT域数字图像水印算法

在一类基于奇异值分解(SVD)的数字水印算法中,提取过程要使用原始图像奇异值分解的正交矩阵;若用其它图像的正交矩阵来代替,则可以重构出任意期望的水印图像,表明算法具有非常高的虚警率.为了消除算法的不确定性,提出了一种改进的基于SVD-DWT域的数字图像水印算法,将SVD分解的正交矩阵U作为控制参数嵌入载体图像小波分解的细节子带中.实验结果表明,该算法既保持了原有算法的鲁棒性和不可见性,同时也消除丁提取结果的不确定性.因此可以将算法应用于版权保护.

A Digital Image Watermarking Algorithm Based on SVD-DWT

In some singular value decomposition(SVD)-based methods,the watermark is constructed by using original singular vectors.If the singular vectors of another image rather than the original watermark are used,another image is constructed instead of the embedded watermark,which will cause the false position probability.In order to remove this ambiguity,the paper proposes an improved digital image watermarking algorithm based on SVD-DWT by embedding the singular vectors of the watermark image into the subbands of...