一种基于小波包分解的自适应数字水印算法  

An Adaptive Digital Watermarking Algorithm Based on Wavelet Packets Transform

作　　者：张旭[1] 张贵仓[1] 

机构地区：[1]西北师范大学数学与信息科学学院,兰州730070

出　　处：《计算机辅助设计与图形学学报》2007年第7期931-934,共4页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家教育部重点科学技术项目(204143);甘肃省科技攻关项目(2GS035-A052-011);兰州市工业科技攻关技术项目(05-1-04)

摘　　要：提出一种基于人类视觉特性和小波包分解的数字水印算法.该算法充分利用小波包分解的特点,将水印信息有选择地嵌入到原始图像中,水印的嵌入强度和嵌入位置均根据原始图像的内容自适应地决定.理论分析和实验结果表明:该算法很好地解决了水印鲁棒性和不可见性之间的矛盾,对一般的图像处理和攻击,如JPEG压缩、滤波、加噪声、裁剪等有很好的鲁棒性.We presented a novel watermarking method based on wavelet packets transform and human visual system （HVS） . The algorithm made use of the characteristics of wavelet packets transform. The watermark was embedded in the original image in which the embedding strategy and the watermark strength were adaptively determined by the original image content. Theoretical analysis and experiment results show that the algorithm solved the conflict of the watermark robustness and perceptual invisibility. It is also robust against normal image processing and attacks, such as JPEG compression processing, filtering processing, adding noise and cutting processing, etc.

关 键 词：数字水印 小波包 人类视觉特性 块能量 攻击 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]