基于FRFT和纹理特征的数字水印算法  

Digital Watermarking Algorithm Based on Fractional Fourier Transform and Texture Character

作　　者：田沛[1] 张兆祥[1] 张雷[1] 杜荣华[1] 

机构地区：[1]华北电力大学控制科学与工程学院,河北保定071003

出　　处：《通信技术》2007年第12期232-234,共3页Communications Technology

摘　　要：文中提出了一种基于分数阶Fourier变换(FRFT)和纹理特征的数字水印算法,该算法首先将水印经Arnold变换进行置乱,然后分别对载体图象和所加水印进行不同阶次的分数阶Fourier变换。根据人眼对图像的纹理和边缘不敏感的视觉特性,在边缘检测后确定的区域中选择幅值大于阈值的系数嵌入水印。最后在噪声、滤波、JPEG压缩、旋转和剪切等攻击方式下,对算法进行了仿真,仿真实验结果表明该算法具有较好的鲁棒性和安全性。A digital image watermarking algorithm has been proposed based on fractional Fourier transform and texture character. The watermark image is first scrambled with Arnold transform , then the original image and the watermark are fractional Fourier transformed respectively with different order. According to the characteristics of HVS （Human Visual System） being insensitive to the image texture and edges, the coefficient of which magnitude is bigger than the threshold in determination region is chosen for embedding into the watermark after edge detection. The algorithm is simulatedand analyzed under different attacks such as noise, filter, JPEG, rotation, and crop compression. The results of simulation experiment indicate that this algorithm is of better robustness and security.

关 键 词：数字水印 分数阶FOURIER变换 边缘检测 鲁棒性 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]