基于DWT低频系数的自适应盲水印算法

提出了一种基于小波变换低频系数的自适应数字水印算法。通过小波变换将图像分解成不同空间与频率的系数,这些系数之间存在着一种树状结构关系。利用这种树状结构关系将低频系数分成两类,一类对应图像的强纹理区域,一类对应图像的弱纹理区域;针对分类的结果将不同强度的水印分量嵌入到对应的低频小波系数中。该算法具有很好的不可感知性,实验结果表明该算法有较好抗JPEG压缩、低通滤波、剪切等各种攻击的能力。

Adaptive blind detection watermarking algorithm based on wavelet low frequency coefficients

In this article,an adaptive digital watermarking algorithm based on low frequency coefficients of discrete wavelet transform(DWT) is proposed.With the wavelet transform,the image is decomposed into different spatial and frequency coefficients,among which a tree structure exists.Using the tree structure,the lowest approximation coefficients are classified into two groups,one corresponds to the stronger texture area,another corresponds to the weak texture area.The watermark is distributed embedded into the lo...