基于标准加权类分数傅里叶变换的水印算法

Watermarking Algorithm Based on the Standard Weighted Fractional Fourier Transformation

提出了一种基于标准加权类分数傅里叶变换的数字水印算法.该算法首先用Logistic映射生成混沌二进制序列对水印图像进行置乱处理,然后对载体图像进行标准加权分数傅里叶变换,选择适当的嵌入强度,将水印的近似和细节信息分别嵌入到分数傅里叶变换的实部和虚部中,最后的数值仿真表明该算法既能保持载体图像的质量,又使水印的细节部分可见,具有较好的鲁棒性和不可感知性,在信息安全中有一定的实用性.

Based on a standard class weighted fractional Fourier transformation a digital watermarking algorithm is proposed. The algorithm first chaotic binary sequences is generated by Logistic mapping to scrambling watermark image processing,then the carrier image standard weighted fractional Fourier transform,and select the appropriate embedding strength,to embed the watermark approximation and detail information respectively fractional Fourier transform of real part and imaginary part of the final numerical simulation show that the algorithm can not only keep the quality of the image,and the details of the watermark is visible,it has good robustness and perceptual,and a certain practicality.