音频数字水印的实现

范文编号:TX406  范文字数:15331,页数:28 附开题报告，文献综述，外文翻译

摘  要
 在网络与数字信息给人们带来方便的同时,也给人们带来了隐患,敏感信息可能轻易地被窃取、篡改、非法复制传播等。传统的信息保护手段(例如，密码学等)已经不能满足目前数字化媒体的安全保护。因此，以数字化的信息隐藏理论为核心的技术应运而生。信息的安全与保密显得越来越重要,信息安全已成为人们关心的焦点,也是当今信息领域的研究热点之一。本文对音频数字水印概念,特点 ,及理论的分析，技术模型,实现算法及攻击方法进行介绍,并且提出了一种新的算法，给出了在MATLAB环境下,对音频数据加入水印,攻击、提取水印的操作的仿真实验。总结了数字水印的前景和展望。
 
关键词：  数字水印 ; 音频水印; 小波变换 ; 鲁棒性 ；感知模型
Abstract
 While the network and the numerical information bring convenience to people, also they bring some hidden danger, the sensitive information may be stolen, changed, and illegal duplication disseminated etc very easily, the traditional information protection method (for example, the cryptology) already cannot satisfy the security of the present digitization media. Therefore, the theory whose core technology is the digitized information hideaway arises at the historic moment. The information security and secrecy appears more and more important and the information security has become the focal point of people. Also is now one of information field research hot spots. This paper (thesis) introduce the concept and characteristics of audio frequency numeral watermark, and its analysis theory, technical mold, realized algorithm and the method of attack then proposed one new algorithm, produced the operation simulation experiment of how to augment watermark to the audio data and the method of attacking and withdrawing watermark in the MATLAB environment .At last, Summarize the prospect and the forecast of digital watermark.
 
Key words：Digital watermarking；Audio watermarking ；wavelet transform；robustness ； percept model

目  录
摘  要 I
Abstract I
音频数字水印的实现 1
引  言 1
1. 绪  论 2
1.1数字水印的概念及特性 2
1.2数字水印的国内外研究现状 3
1.3当前研究存在的问题 3
1.4 本文的主要研究工作 3
2. 基础理论知识 4
2.1音频信号的理论分析 4
2.2音频数字水印的性质分析 5
2.3倒谱分析 6
2.4音频水印系统的常用评价标准 7
3. 经典的音频数字水印算法 9
3.1音频数字水印算法简介 9
3.2 时间域算法 9
3.3 变换域算法 12
4．一种新的基于感知模型的小波域音频数字水印算法 16
4.1音频感知模型 16
4.1.1帧的划分及绝对听力阈值 16
4.1.2音频信号的临界频带及频谱 16
4.2 密钥1的形成 17
4.3 水印的嵌入与检测 17
4.4实验仿真及分析 18
参考文献 24
致  谢 25

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