一种基于离散小波变换的信息隐藏算法的实现

为了进一步改进信息隐藏算法,提出了一种能实现数字图像在变换域中内嵌水印的改进算法。由于数字图像在进行离散小波变换（Discrete Wavelet Transform,DWT）后其系数是相互关联的,如果再对这些系数进行离散余弦变换（Discrete Cosine Transform,DCT）进而内嵌数字水印,那么这种算法就同时具备了两种变换的特性。实验证明该算法不仅保证了水印的隐蔽性,也对图像处理操作具有良好的鲁棒性。

The Realization of An Information Hiding Algorithm Based on DCT Domain

To improve information hiding algorithm,an improved algorithm realizing digital image watermark embedding in the transform domain is presented.On the basis of deeply understanding that the coefficient of a digital image after Discrete wavelet transform has correlation,it carries out DCT transform of the transformed digital image coefficient and then embeds digital watermarks,which makes the algorithm have the characteristics of the two transforms.Experiments show that this algorithm not only ensures the invisibility of watermark but also has good robustness.