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题名:
基于参数化的数字媒体内容保护研究
作者: 李宁
答辩日期: 2008-05-30
导师: 赵险峰
专业: 计算机软件与理论
授予单位: 中国科学院研究生院
授予地点: 中国科学院软件研究所
学位: 硕士
关键词: 数字媒体内容 ; 低操作代价 ; 参数化小波 ; 非均匀采样 ; 数字版权管理
其他题名: Research of Digital Multimedia Content Protection Based on Parameterization
部门归属: 信息安全国家重点实验室
摘要: 随着多媒体技术和网络技术的发展,数字媒体被人们广泛应用于娱乐、商业等场合。数字媒体内容具有易存储、易散布的特性,这些特点一方面促使了多媒体应用的发展,另一方面也给数字媒体内容的版权管理带来了不便。目前用于保护数字内容版权管理的相关技术主要包括数字水印技术和数字权限管理技术(Digital Rights Management ,简称DRM系统)。前者并不能阻止提前侵权行动的发生,而后者着重于侵权行为前的访问控制和版权管理,通过一定的加密算法对数字媒体的整个生命期进行管理和控制。本文主要讨论了如何设计适用于数字版权管理环境中的低操作代价数字媒体保护算法。本文首先介绍了视频、图像的特点及相关保护方法,然后分析了数字媒体保护的特殊要求,并指出,通过降低非授权获取数字媒体的信号质量可以达到保护目的。针对视频,根据非均匀采样原理构造出非均匀离散余弦变换矩阵,提出了一种基于非均匀离散余弦变换(NDCT)的MPEG-4视频保护方案。通过密钥控制生成用于视频编码的NDCT矩阵,将加密保护和视频编码结合起来。然后我们对该方案的各项性能进行了详细地分析和简单地证明。关于图像保护,我们重点分析了现有的参数化小波方法,利用小波性质方程组和可变参数设计了一种非约束的参数化小波方法。我们在图像编码过程中使用根据密钥参数生成的小波,并将密钥作为图像编码参数,达到了保护图像的目的。最后通过实验对该方法的性能进行了详尽地分析并且指出了一些有待继续研究的问题。
英文摘要: With the development of multimedia and network technology, digital media has been widely used in many fields, such as entertainment, business, etc. Digital media contents are easy to store and distribute, which improves the development of multimedia application. But these characteristics also make it difficult to manage the copyrights of digital media contents. Nowadays, watermark and digital rights management are the main technology for protecting copyrights of digital contents. The former can’t prevent torts before they happen. However, the latter focuses on access control and copyrights management before torts. It tries to control and manage the whole life cycle of digital media by applying some encryption algorithms. This paper mainly discusses how to design digital media protection methods with low operation costs, against the application background of digital rights management. We introduce characteristics of video and images, and then analyze the corresponding protection methods and some particular requirements, and find we can achieve protection by reducing signal quality of unauthorized access. Based on non- uniform DCT, we design and implement a new protection scheme. By using the key to produce the NDCT matrix, which is used during video encoding, it combines protection and encoding together. According to image protection, we analyze some existing method of parameterization wavelet. Then we design a new method to produce parameterization wavelet by using variable parameters and wavelet nature equations. So we can protect images by using the secret wavelet, which are produced during encoding process. At last we discuss some issues which need further research.
内容类型: 学位论文
URI标识: http://ir.iscas.ac.cn/handle/311060/5840
Appears in Collections:信息安全国家重点实验室_学位论文

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Recommended Citation:
李宁. 基于参数化的数字媒体内容保护研究[D]. 中国科学院软件研究所. 中国科学院研究生院. 2008-05-30.
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