基于DCT-DWT的FRFT数字水印算法  

Method of digital watermark in FRFT domain based on DCT-DWT

作　　者：华梦 王雷[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,江苏南京210094

出　　处：《南京理工大学学报》2015年第4期435-439,共5页Journal of Nanjing University of Science and Technology

摘　　要：为了提高数字水印的鲁棒性、不可见性和安全性,该文提出了基于离散余弦变换-离散小波变换(Discrete cosine transform-discrete wavelet transform,DCT-DWT)文中的分数阶傅里叶变换(Fractional Fourier transform,FRFT)数字水印算法。该方法利用离散余弦变换的聚焦性、离散小波变换的多分辨率特性、分数阶傅里叶变换的时频性,把水印信息很好地嵌入到载体图像中,提高了水印的鲁棒性和不可见性,同时利用Arnold变换对水印进行加密,提高了数字水印的安全性。MATLAB仿真表明:该算法具有很好的安全性、鲁棒性和不可见性。In order to improve the robustness,invisibility and security of digital watermark,this paper puts forward the fractional Fourier transform( FRFT) digital watermarking algorithm based on discrete cosine transform( DCT) and discrete wavelet transform( DWT). This method uses the focus of DCT,multiresolution of DWT and time-frequency of FRFT,the watermark information is embedded into the carrier image very well. At the same time,we use Arnold transform on the watermark encryption,security has been improved more. MATLAB simulation shows that the algorithm has good security,robustness and invisibility.

关 键 词：离散余弦变换 离散小波变换 分数阶傅里叶变换 数字水印 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]