基于离散傅里叶变换的数字水印算法

Digital watermarking algorithm based on discrete Fourier transform

提出了一种基于二重加密和离散傅里叶变换的数字水印算法:为保证安全性,水印在嵌入载体图像前先进行基于Logical映射的混沌置乱,又通过Arnold变换进一步实行加密;嵌入时,根据水印位的值对DFT系数的相位进行设定.实验结果证明,该算法具有较好的不可见性和鲁棒性.

A digital watermarking algorithm based on double encryption and discrete Fourier transform（DFT） was proposed.To ensure security,the chaotic scrambling based on logical mapping is conducted before embedding carrier image,then the implementation of encryption by Arnold transform is furthered.Then according to the bit values of watermarking,it is to be embedded to modify the phase of DFT coefficients.Experimental results show that the algorithm has good invisibility and robustness.