摘要
基于快速傅里叶变换提出了一种傅里叶谱域图像水印算法。对图像和水印图像分别进行傅里叶变换,将作为水印的32×32大小的图像的二维傅里叶谱降维为一维序列,叠加在图像傅里叶谱域中适当位置上,再经过快速傅里叶逆变换得到水印图像。选择的嵌入方案即适当的位置既不会使水印图像产生明显失真,又可以抵抗图像压缩和低通滤波。在JPEG压缩、图像旋转、高斯低通滤波的攻击方式下,对水印图像进行了鲁棒性分析,实验表明该算法具有良好的抗攻击性和安全性。
This paper presents a digital image watermarking in the Fourier transform domain. The original image and the watermark image are respectively transformed. The watermark image of 32 × 32 in the frequency domain is viewed as one dimensional sequence, and added to a proper place in the frequency domain of the original image. Then the original image in the frequency domain added with watermark is inversely transformed and the watermark image is obtained. The selection of a proper place can not only avoid obvious distortion of watermarked image, but also resist lossy image compression and lowpass filtering. The robustness of the watermark image under different attacks, such as jPEG compression, image rotation and Guassian lowpass filtering, has been analyzed. The results show that this algorithm has a better security and anti-attack performance.
出处
《北京石油化工学院学报》
2006年第1期1-4,共4页
Journal of Beijing Institute of Petrochemical Technology
关键词
数字水印
傅里叶变换
鲁棒性
digital watermarking
fourier transform
robustness
