魯棒性數(shù)字水印系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)
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摘要
計(jì)算機(jī)網(wǎng)絡(luò)和通信技術(shù)的迅猛發(fā)展，使得數(shù)字信息的產(chǎn)生、復(fù)制、傳播更為容易。在這個背景下，如何防止具有版權(quán)的數(shù)字?jǐn)?shù)據(jù)在未經(jīng)允許的情況下，被非法的使用或是傳播，這就提出新的研究的課題：就是如何運(yùn)用現(xiàn)有的理論和技術(shù)，更好的解決數(shù)字產(chǎn)品所有者的合法權(quán)益的保護(hù)問題。數(shù)字水印技術(shù)就是在這樣的背景下誕生的。
本文就基于離散小波變換的數(shù)字水印技術(shù)做以下的工作：（1）對數(shù)字水印的概念、框架、分類及應(yīng)用做一個簡要的介紹；（2）簡單回顧一下水印嵌入策略核心小波理論，并著重介紹多分辨分析及Mallat算法；（3）簡要介紹人類視覺感知系統(tǒng)（HVS），討論其在水印嵌入過程中的作用；（4）設(shè)計(jì)并實(shí)現(xiàn)基于小波變換與人類視覺系統(tǒng)的水印嵌入算法；（5）通過各種常見攻擊驗(yàn)證系統(tǒng)的魯棒性，證明該水印系統(tǒng)對于常見攻擊具有魯棒性并且保證水印的不可見性。最后總結(jié)所做工作并指出不足之處。
關(guān)鍵詞：數(shù)字水印，離散小波變換，人類視覺系統(tǒng)



Design and Implement of a robust digital watermarking system
Abstract
The revolution in digital technology has increased the case of manipulation, reproduction, retransmission, and distribution of digital images. However, it also offers the potential for illegal use, known as a piracy of digital images. Consequently, the need to manage and protect these digital properties has become crucial. Watermarking technology is considered as an alternative tool for protecting these intellectual properties. It attempts to identify the true owner by hiding perceptually invisible information (watermark) inside the digital data. In this thesis, for the purpose of protecting the Intellectual Property Rights (IPR) of digital images, a Discrete Wavelet Transform (DWT) based digital watermark algorithm is described. The proposal is designed for images.
The key points of research addressed in this proposal include: (1) The structures of watermark being embedded that enhance the perceptual invisibility and watermark detection efficiency. (2) Watermark embedding strategy. For instance, watermark embedding function and watermark embedding parameters (weighting function-embedding energy, embedding level and spatial location), which maximize the robustness and invisibility of the watermark. (3) The possibility of using Human Visual System (HVS) in the Watermark Embedding Process (WEP). (4) The Watermark Detection Process (WDP), especially, the reliability of the proposed watermarking algorithm after distortion by several kinds of watermark attacks. (5) The robust watermarking protocol for proving ownership.
Key word: Digital Watermarking, Discrete Wavelet Transform, Human Visual System

目 錄

1緒論 1
1.1 課題研究的背景和意義 1
1.2 國內(nèi)外研究狀況 1
1.3 本文的結(jié)構(gòu)與內(nèi)容 3
2 數(shù)字水印概述 5
2.1 數(shù)字水印的基本框架 5
2.2 數(shù)字水印的技術(shù)特點(diǎn) 7
2.3 數(shù)字水印分類 8
3 小波分析及其應(yīng)用 12
3.1 引言 12
3.2 小波的發(fā)展歷程 13
3.3 小波變換 14
3.3.1 連續(xù)小波變換 15
3.3.2 離散小波變換 16
3.3.3 多分辨分析 16
3.4 Mallat算法及應(yīng)用 19
4 基于HVS與DWT的數(shù)字水印系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn) 21
4.1 HVS模型簡介 21
4.2 水印嵌入位置的選擇 22
4.3 水印嵌入強(qiáng)度的計(jì)算 22
4.4 本文算法的具體實(shí)現(xiàn)步驟 24
4.4.1水印的嵌入算法及步驟： 24
4.4.2水印的提取算法及步驟： 24
4.5 魯棒性測試 24
4.5.1 JPEG壓縮攻擊 25
4.5.2增強(qiáng)處理攻擊 27
4.5.3附加噪聲攻擊 27
4.5.4測試結(jié)果分析 29
總結(jié) 30
致謝 31
參考文獻(xiàn) 32


參考文獻(xiàn)
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[5]劉瑞禎，譚鐵牛.數(shù)字圖像水印研究綜述[J].通信學(xué)報(bào)
[6] Cox I.J, Miller M .L. The First 50 Years of Electronic Watermarking[J]. EURASIPJ .of Applied Signal Processing
[7] F. L. Bauer, Decrypted Secrets-Methods and Maxims of Cryptology[R]. Berlin,
Heidelberg ,Germany: Springer-Verlag