一种基于图像DC系数的多比特水印  

A Multi-bit Image Watermarking Based on DC Coefficients

作　　者：史谨璠[1] 王炎[1] 王建军[1] 张立明[1] 

机构地区：[1]复旦大学电子工程系图像与智能实验室,上海200433

出　　处：《信息与电子工程》2005年第2期86-90,共5页information and electronic engineering

基　　金：国家自然科学基金(NSF60171036);国家自然科学基金(NSF30370392)

摘　　要：提出了一种新的多比特水印算法。该算法把基于图像自身的水印信息嵌入到图像的DC系数中,通过视觉模型控制DC系数的改变程度,在保证水印不可见性的同时,提高了水印的鲁棒性。为实现水印的盲检测,采用Gold码序列对水印信息进行了扩频。在检测阶段,充分利用Gold序列良好的相关性恢复出水印。应用所提出算法,把水印信息嵌入到一幅512×512的灰度图像中。实验表明,该算法对常规信号处理攻击和几何攻击具有很强的鲁棒性。A new multi-bit watermarking algorithm is proposed in this paper. In the algorithm, the watermarks based on image itself are embedded into the DC coefficients, and the changeable intensity of DC coefficients is controlled by visual model. This enables to keep the invisibility, and at the same time improve the robustness of watermarks. In order to realize blind detect, watermarks are spread with Gold sequences. In the detection, the good correlation of Gold sequences is taken advantage of to recover watermarks. With the proposed algorithm, watermarks are embedded into a gray scale image with size of 512 × 512. The results demonstrate that this algorithm is very robust against the general image processing and geometric attacks.

关 键 词：信息处理技术 算法 多比特 DC系数 视觉模型 GOLD序列 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]