基于混沌置乱和分形维数的数字水印算法

Digital Watermark Algorithm Based on Chaotic Scrambling and Fractal Dimensions

把分形维数理论应用到数字水印中,提出了基于混沌置乱和分形维数的DCT域数字图像水印算法。首先将载体图像分块,计算每个小块的分形维数,根据分形维数调节嵌入强度系数,将经过混沌置乱的水印图片嵌入到载体图像的DCT域直流分量中。MATLAB实验结果表明,该算法具有较好的不可见性,对常见的图像处理攻击具有较好的鲁棒性。

In tbis paper, fractal dimensions theory is applied to digital watermark technology, an algorithm based on chaotic scrambling and fractal dimensions is proposed. Firstly, the original image was split into non-overlapping blocks, the fraetal dimensions of each blocks was computed. Secondly, the watermark embedding factor is adjusted by fractal dimensions, and the binary watermark image with chaos scrambling is adaptively embedded into the original image＇s Direct Current（IX2） block of IX2T domain. Experimental result using MATLAB shows that the algorithm is invisible and has good robustness for some common image processinlz operations.