不对称分数傅立叶图象盲水印算法

结合空间域和变换域算法特点,利用不对称分数傅立叶变换的特性,提出了一种图象盲水印算法.对载体图像的行列方向分别实施不同级次的分数傅立叶变换,将原始水印图像用最低有效位算法嵌入到载体图像的级的分数域的低频幅值矩阵中,再进行逆变换得到水印图像.缓解了水印的不可见性与鲁棒性之间的矛盾,提高了水印安全性.实验结果表明,该水印具有良好的不可见性和抗噪声攻击能力.

A Blind Image Watermarking Algorithm Based on Dissymmetrical Fractional Fourier Transform

By utilizing the character of dissymmetrical fractional fourier transform and combine the algorithm advantage of space domain and frequency domain,it presents a blind image watermarking algorithm.Firstly the carrier image is dissymmetrical fractional fourier transformed with different order in the row and columns direction.Then with LSB algorithm,the original watermarking is embed in the lower "frequency" coefficient matrix of fractional fourier domain of order.The final watermarking image is obtained by inversely transforming the joint spectra.This algorithm mitigate the illogicality between the robustness and invisibility and enhance the watermarking security.Experiment results showed that this watermarking image has better performance of invisibility and anti-attack of noise.