摘要
由于DFRFT同时包含了频域与时域的信息,在水印的嵌入与提取算法中,根据所取DFRFT的幂次α的不同结果也不一样,增强了水印的保密性。在仿真实验的结果中表明用DFRFT实现的数字水印算法比用傅里叶变换及小波变换实现的数字算法具有更好的安全性。
Because of the DFRFT both contain the information in frequency and time domain, in the algorithm of watermark embeded and detection the watermark result should be different go with the power α of the DFRFT,it makes the watermark more security. Via the emulational experimentation of image proved that the digital watermark algorithm based on DFRFT is more security than that based on Fourier Transform and Wavelet Transform.
出处
《计算机应用研究》
CSCD
北大核心
2005年第2期229-230,254,共3页
Application Research of Computers
基金
国家自然科学基金资助项目(50079032)
关键词
数字水印
网络安全
离散分数傅里叶变换
检测门限
Digital Watermark
Network Security
Discrete Fractional Fourier Transform
Detection Dhreshold
