数字水印嵌入强度最优化分析  

An Optimization Algorithm of Digital Watermarking Scaling Parameter

作　　者：王树梅[1] 赵卫东[1] 王志成[1] 

机构地区：[1]同济大学CAD研究中心

出　　处：《计算机安全》2007年第10期1-4,共4页Network & Computer Security

基　　金：国家"863"高技术研究发展计划基金项目(2005AA414020);上海市科学技术委员会科研计划项目(052912065)

摘　　要：数字水印技术是一种保护版权的重要技术。水印系统里,最重要的两个关键因素就是水印嵌入后,载体图像的抗攻击性(鲁棒性)和不可见性。如何在水印嵌入过程中,使得这样一对矛盾达到统一,嵌入强度起着较为关键的作用。过大会影响水印的不可见性;过小,水印的抗攻击性减弱,从而失去嵌入水印的本意。该文提出一种基于载体图像和水印信息本身特点的求解的算法,该算法详细分析了图像特点与鲁棒性、不可见性之间的关系。通过分析图像和含水印图像的相似度以及峰值信噪比,计算出的解。实验证明,通过此方法求得的能够更好地适应原始图像,使得水印图像的鲁棒性和不可见性达到最佳折中。Digital watermarking is an important technology of copyright attack-resistant （robustness） and invisibility of the watermark embedded embedding process, plays a crucial role. watermark intention. In this paper, an image, in which the relationship between analyzing similarity and peak signal to this method can make scaling parameter protection image, n watermarking system, two key factors are the How to make the contradiction to reunification in the it is too great to get visiblity,and too small, the robustness is weakened, and thus losing embedded algorithm to get best scaling parameter is presented based on the characteristics of the carrier characteristics and robustness of carrier is analyzed detailed. The scaling parameter is found through ratio between the original image and the watermark image. Many experiments are evidences that to better adapt to the original image,and also make robustness and invisibility to achieve the best compromise.

关 键 词：数字水印 嵌入强度 最优化 离散余弦变换 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]