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摘 要
數(shù)字水印是一種嵌入到圖像、視頻或者音頻數(shù)據(jù)中的標志，通過對水印信息的檢測可以達到保護多媒體數(shù)據(jù)版權(quán)的目的。近年來，數(shù)字水印技術(shù)得到了較大的發(fā)展，基于變換域特別是基于DCT的水印技術(shù)是目前研究的熱點，并且目前DCT編碼在JPEG、MPEG、H.26x等編碼標準都中有著廣泛的應用。本課題針對基于DCT的視頻水印算法進行研究,在簡要介紹本課題研究背景與本課題的國內(nèi)外研究動態(tài)的基礎上，隨后介紹了數(shù)字水印技術(shù)的應用、特點和攻擊方法與視頻水印的特點及其國內(nèi)外發(fā)展動態(tài)。本文重點對基于DCT的低頻水印算法、基于DCT的中頻水印算法和基于DCT的自適應視頻水印算法進行了深入分析與研究，使用偽碼對這三種算法進行了簡單的實現(xiàn)。對基于DCT的中頻水印算法進行了改進，在改進算法中對水印序列進行了擴頻，并對DCT變換后中頻系數(shù)的處理進行了改進。最后，在MATLAB中對水印的嵌入 、水印的檢測與水印的剪切攻擊進行了實驗。
關鍵詞:DCT；水??；視頻；低頻；中頻；

Abstract
Digital watermarking techniques have been proposed as a solution to the problem of copyright protection of multimedia documents. Digital watermark is mark embedded in digital image, video or audio documents, which can be detected to protect copyright of multimedia data. Digital watermarking techniques have greatly developed in recent years. Watermarking techniques based on the transformation domain has become a heated issue in the academic research of the field, and DCT (Discrete Cosine Transform) transforming coding has been widely used coding standards such as JPEG, MPEG and H.26x at present. The subject is mainly propose the DCT-based video digital watermarking，in briefly introduced the background research and domestic and foreign research dynamic of the subject. Afterwards introduced the application, the characteristic and the attack method of digital watermarking technology and the video digital watermarking characteristic and its the domestic and foreign development tendency. The article principally researches and analyzes an intermediate frequency DCT-based watermarking algorithm, a low frequency DCT-based digital algorithm and a DCT-based transforming watermarking algorithm, To has made an improvement to the DCT- based intermediate frequency watermarking algorithm, has carried on the wide frequency to the watermark sequence in the improvement algorithm, and has made an improvement to intermediate frequency coefficient processing after the DCT transformation. Finally, haven the experiment in MATLAB about imbedding watermarking, detecting watermarking and cutting attacks.
Key words: DCT；Watermarking；video；

目 錄
摘 要I
AbstractII
1 緒論1
1.1 本課題研究背景1
1.2 本課題的國內(nèi)外研究現(xiàn)狀1
1.3 本課題的主要內(nèi)容3
2 數(shù)字水印技術(shù)4
2.1數(shù)字水印的概念4
2.2水印的應用4
2.3 水印的特征5
2.4水印攻擊6
3 視頻水印技術(shù)8
3.1 視頻水印技術(shù)的特點8
3.2 目前視頻水印的主要嵌入和提取方案8
4基于DCT的低頻水印算法14
4.1 算法的基本原理14
4.2 代碼實現(xiàn)15
4.3 算法分析21
5 基于DCT的中頻水印算法22
5.1 算法的基本原理22
5.2 原始算法代碼實現(xiàn)23
5.3 原始算法分析28
5.4 算法改進29
4.5 改進算法代碼實現(xiàn)30
6 基于DCT的自適應視頻水印方案32
6.1 基本原理32
6.2 代碼實現(xiàn)34
7 總結(jié)與展望36
參考文獻39
致 謝40