基于小波变换的中频水印算法  

Based on Wavelet Transform in Middle Frequency Watermarking Algorithm

作　　者：姜良华[1] 韩枭[1] JIANG Liang-hua, HAN Xiao （Guilin University of Technology, Guilin 541004, China）

机构地区：[1]桂林工学院,广西桂林541004

出　　处：《电脑知识与技术》2008年第7期137-140,共4页Computer Knowledge and Technology

摘　　要：数字水印是解决信息安全和版权保护的有效的方法,已成为多媒体信息安全领域的热门技术。现有的数字水印技术算法主要集中在空间域用变换域两类,而离散小波变换（DWT）由于具有时频双重特性,与人类视觉系统（HVS）相匹配等特点,在数字水印技术中应用越来越广泛。本文为克服现有小波变换域中低频与高频嵌入算法的缺点,提出了从小波变换后的中频部分选择待嵌入系数,并根据人类视觉特性对嵌入强度进行调整。经实验结果证明该算法能够使不可见性与鲁棒性达到较好的折中。Digital watermarking is to address information security and copyright protection effective, multimedia has become a hot field of information security technology. Existing digital watermarking technology algorithm mainly concentrated in the space domain to transform domain two, and discrete wavelet transform （DWT） owing to the time-frequency characteristics of the double, and the human visual sys- tem（HVS） to match the characteristics of the application of digital watermarking technology more and more widely. In this paper, to over- come the existing wavelet transform low-frequency and high-frequency domain algorithm embedded in the shortcomings raised from the wavelet transform part of the IF choice to be embedded coefficient, and in accordance with human visual characteristics of embedded strength to adjust. The experiment results show that the algorithm can not visible and the robustness of the compromise reached better.

关 键 词：数字水印 离散小波变换(DWT) 不可见性 鲁棒性 中频系数 

分 类 号：TP301[自动化与计算机技术—计算机系统结构;自动化与计算机技术—计算机科学与技术]