摘要
数字水印算法面临几何攻击时,往往丢失了水印嵌入与水印检测的同步性,造成水印算法的彻底失效,而基于特征点的水印算法能够较好地抵抗几何扭曲的攻击,特别是基于最新的旋转、缩放、平移不变的SIFT特征点的数字水印算法,在抵抗几何攻击的同时,能够较好地抵抗光照,视角等变化。在分析SIFT特征点选取原理的基础上,指出了该方法的优势及能够抵抗RST攻击的本质原因,对其算法进行了matlab优化实现,并提出了基于SIFT的抗几何攻击的数字水印方案,此外,给出了图像特征点的一般定义,讨论了水印特征点选取一般和理想要求。
When digital watermark meets geometric attack, generally the synchronization between the embedding and extraction of the watermark is lost, which means the watermark algorithm is useless. The algorithm based image features can better resist geometric distortion, especially the algorithm based on SIFT. SIFT is not only can resist RST, but also can resist the change of the illumination and viewpoint. Based on the principle analysis of SIFT, introduce the key reasons that SIFT can endure RST distortion, then give out the implementation using Maflab program, and propose a digital watermark scheme which can endure RST attack based on SIFT, by the way, propose a general definition for image special points, and discuss the general and idle requirement for digital watermark special points.
出处
《计算机技术与发展》
2011年第3期174-177,共4页
Computer Technology and Development
基金
河北省科技基金资助项目(05213579)
