【作者】 张兆祥；

【导师】 田沛；

【作者基本信息】 华北电力大学（河北） ， 控制理论与控制工程， 2007， 硕士

【摘要】 随着网络技术和多媒体技术的飞速发展,数字产品的应用越来越广泛,信息安全问题逐渐受到人们的关注,其中数字产品的版权保护成为一个迫在眉睫的问题。数字水印技术是实现版权保护的有效办法,已成为信息安全研究领域的一个热点。以分数阶傅立叶变换理论为基础,本文在以下几个方面进行了研究:(1)分析了分数阶傅立叶变换理论及其快速算法。(2)提出了一种基于分数阶傅立叶变换和纹理特征的数字水印算法。(3)结合多参量离散分数阶傅立叶变换理论,提出了基于MPDFRFT的数字水印算法。仿真实验结果表明两种算法很好地实现了水印的隐藏,并具有较好的鲁棒性和安全性。更多还原

【Abstract】 With the development of the network and the multimedia technology, the application of the digital product is more and more wide. The information security becomes the concern in people’s life. Especially, the copyright protection of digital product has become an urgent problem. Digital watermarking technology is an effective way of copyright protection, and it becomes a focus in the information security domain. On the base of the fractional Fourier transform theory, what the author has studied and realized mainly are as follows: (1) The fractional Fourier transform and it’s fast algorithm have been analyzed. (2) A digital image watermarking algorithm has been proposed based on fractional Fourier transform and texture character. (3) Combining multiple-parameter discrete fractional Fourier transform theory, An image watermarking algorithm based on MPDFRFT has been proposed. The simulation experiment results have demonstrated that the two algorithms proposed not only realized watermark hidden well, and have better robustness and security.更多还原