摘要
数字水印是解决数字产品版权问题的一个有效手段,不可见性和鲁棒性是数字水印的关键。为了平衡数字水印的不可见性和鲁棒性,提出了一种基于二维经验模式分解和离散余弦变换的图像数字水印算法。对原图像做BEMD分解,获得其相应的若干固有模态函数(IMF)和一个余项(Residue),对分解的最后一个固有模态函数进行离散余弦变换,将水印信息嵌入到图像在DCT域的中频分量。实验结果表明,该算法具有较好的不可见性和抗攻击的鲁棒性。
Digital watermark is an efficient method to solve the copyright issue of digital products. The key points of the digital watermark are the invisibility and robustness. An image digital watermark algorithm based on bidimensional empirical mode decomposition （BEMD） and discrete cosine transform （DCT） is proposed to balance the invisibility and robustness. The BEMD of the original image was performed to obtain the corresponding intrinsic mode function （IMF） and a residue. The last one of FMFs given in the first step is transformed according to DCT, and the watermark information is embedded into the intermediate frequency component in DCT domain. The experimental results show that the algorithm has better invisibility and robustness against attacks.
出处
《现代电子技术》
2013年第17期59-61,64,共4页
Modern Electronics Technique
