基于小波变换的自适应数字水印算法  

An Adaptive Watermarking Algorithm Based on Wavelet Transform

作　　者：应隽[1] 李宏[1] 吕振肃[1] 

机构地区：[1]兰州大学信息工程学院,兰州730000

出　　处：《船电技术》2003年第5期36-39,共4页Marine Electric & Electronic Engineering

摘　　要：随着多媒体和网络技术的迅速发展与广泛应用,对多媒体数字产品(如数字图像、数字视频和音频等)的版权保护成为迫切需要解决的问题。数字水印作为一种新的版权保护手段得到越来越多的应用。本文利用小波变换良好的时频局部特性,提出了一种基于小波变换的自适应数字水印嵌入和检测方案。水印的嵌入位置及嵌入强度都是根据原始图像的特点自动调节,提高了数字水印的隐蔽性,同时把扩频的概念引入数字水印系统中,提高了数字水印的鲁棒性。实验结果表明该算法有较好抗JPEG压缩、随机噪声等攻击的能力。With the rapid development of multimedia and information network, the copyright protection of digital media as image、video and audio becomes more and more important .Digital watermarking as a new method for copyright protection becomes more and more popular. In this paper, a new algorithm is proposed based on the wavelet transform to increase the invisibility of the digital image watermark because it can exploit the temporal and spatial phenomena of human visual system. The concept of spread spectrum is used here to improve the robustness of the watermark. Experiments show that the algorithm in this paper can resist the damages from JPEG compression, random noising and cropping attacks.

关 键 词：小波变换 自适应水印算法 数字水印 图像处理 信息隐藏 时频局部特性 水印嵌入 

分 类 号：TN911.73[电子电信—通信与信息系统]