【作者】 王瑞红；

【导师】 张丽静；

【作者基本信息】 华北电力大学（河北） ， 计算机应用技术， 2008， 硕士

【摘要】 随着网络通信的飞速发展以及多媒体技术的广泛应用,数字产品版权的保护问题变得越来越重要。数字水印技术已成为解决数字多媒体版权问题的主要工具。本文分析讨论了数字水印技术的基本原理、典型算法及数字水印的攻击方法,提出了一种基于离散小波变换的数字水印算法。该算法使用推广的Arnold变换对水印进行置乱,提高了水印的安全性;将水印嵌入到原始图像离散小波变换的中频子带中,保证了算法的鲁棒性;利用人类视觉系统确定水印的嵌入强度,提高了水印的不可感知性;实现了水印的盲提取,增强了算法的适用性。本文对所提出的算法进行了VC++6.0仿真实验,并进行了性能分析。实验结果表明,所提的算法具有良好的鲁棒性,同时也很好地保证了水印的不可感知性。更多还原

【Abstract】 With the rapid development of network communication and broad application of multimedia technology, copyright protection of digital median work is becoming more and more important. Digital watermarking is viewed as an effective tool for copyright protection of multimedia data.At first the princip1e, typical algorithms and attack analysis of digital watermark is described. Then, a watermarking algorithm based on DWT is proposed. The watermark image is scrambled by a generalized Arnold transform so as to improve the security of the watermark; the watermark is embedded into the middle-frequency subband which guarantees the robustness of the algorithm; In order to implement the blind extraction, this paper improves an embedding algorithm based on HVS, which enhances the applicability of the algorithm. This paper tests the algorithm by VC++6.0, and quantity of experiment data shows that algorithm has good robustness, and the imperceptibility of watermark can be guaranteed at the same time.更多还原