摘要
几何攻击是一种简单、有效的数字水印攻击方法。本文根据Fourier-mellin变换方法的原理,提出了一种改进算法。在水印嵌入过程中,只进行一次全频Fourier变换,改第二次的全频Fourier变换为只对中频部分进行,并对变换过程进行改进。算法既降低了复杂度,又尽量避免了插值所导致的水印图像和水印信号的失真。实验结果表明该水印算法能抵抗RST攻击和JPEG压缩。
R ST attacks are simple and effective ways to attack watermark of digital image. In this paper, an algorithm based on the Fourier-mellin transform is proposed. In the embedding procedure, single full Fourier transform is applied, while the second Fourier transform is done on the middle band instead of all bands with some improvements in the transform. The algorithm efficiently reduces the complexity and avoids the image distortion induced by the interpolation. The experiment results show the method is robust against RST attacks and JPEG compression.
出处
《计算机与现代化》
2009年第9期99-102,共4页
Computer and Modernization
基金
福建省教育厅科技资助项目(JB05047)
福州大学科技发展基金资助项目(2005-XQ-15)
