基于MATLAB的數(shù)字圖像水印技術(shù)研究

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摘要: 隨著信息技術(shù)和網(wǎng)絡(luò)技術(shù)的飛速發(fā)展，數(shù)字多媒體信息的存儲(chǔ)、復(fù)制和傳播變得十分方便，但同時(shí)也引發(fā)盜版、版權(quán)糾紛和信息是否安全等問(wèn)題。因此如何保護(hù)作品的版權(quán)已經(jīng)受到人們的廣泛重視。為了解決這個(gè)問(wèn)題，數(shù)字水印技術(shù)應(yīng)運(yùn)而生。版權(quán)所有人只需憑借數(shù)字水印，就可維護(hù)其利益和所有權(quán)聲明。
本文主要研究基于MATLAB的數(shù)字水印技術(shù)。詳細(xì)闡述了數(shù)字水印的相關(guān)概念和離散小波變換（Discrete Wavelet Transform，DWT）的原理。該算法在整個(gè)頻域中選擇滿足在同尺度和同方位下絕對(duì)值大于相應(yīng)的恰可察覺(jué)誤差的小波系數(shù)作為嵌入點(diǎn)，對(duì)嵌入點(diǎn)的小波系數(shù)用對(duì)應(yīng)與該點(diǎn)的恰可察覺(jué)誤差進(jìn)行量化，對(duì)量化后的系數(shù)進(jìn)行修改來(lái)實(shí)現(xiàn)水印嵌入；圖像認(rèn)證檢測(cè)時(shí)，若提取的水印信息與原始水印信息有差，則認(rèn)為圖像已被篡改。該算法的篡改定位能力很好，但抗壓縮能力差，而且不是盲水印。
在MATLAB7.0環(huán)境下進(jìn)行了仿真實(shí)驗(yàn)，把有意義的二值圖像作為水印信號(hào)進(jìn)行嵌入與提取。實(shí)驗(yàn)結(jié)果表明，在實(shí)驗(yàn)中所采用的算法，能夠滿足數(shù)字圖像水印技術(shù)的不可見(jiàn)性和魯棒性的要求，并且具有一定的實(shí)用性。

關(guān)鍵詞：數(shù)字水印技術(shù) 離散小波變換 MATLAB

Research on digital image watermarking technique based on MATLAB
Abstract: With the rapid development of information technology and network technology, digital multimedia information storage, reproduction and transmission have become very convenient, but also whether piracy, copyright disputes and information security and other issues. So the copyright protection of multimedia content and content identification has become a problem to be solved. In order to solve this problem, digital watermarking technology arises at the historic moment. Copyright owners simply relying on digital watermarking, can maintain its interests and ownership declaration.
This paper mainly studies the digital watermarking technology based on MATLAB. This paper expounds the related concepts of digital watermarking in detail and the principle of the discrete wavelet transform (DWT). The algorithm in the frequency domain chosen meet on the same scale and tongfang an absolute value is greater than the corresponding just noticeable difference as embedded wavelet coefficients, the embedding of wavelet coefficients using the quantitative just noticeable difference that corresponds to that point, after the quantitative coefficients are modified for watermark embedding; Image authentication test, if the extracted watermark and the original watermark information there, is that the image has been tampered with. Tamper with the ability of the algorithm is very good, but the compression resistance is poor, and not blind watermarking.
Under the environment of MATLAB7.0 simulation experiment, the meaningful binary image as watermark signal is embedded and extracted. The experimental results show that the algorithm adopted in the experiment, can satisfy the digital image watermark technology of invisibility and robustness requirements, and has a certain practicality.

Key words： Digital watermarking technology The discrete wavelet transform MATLAB

目 錄
第一章 緒論 1
1.1數(shù)字水印技術(shù)的研究背景及意義 1
1.2國(guó)內(nèi)外研究現(xiàn)狀 2
1.3數(shù)字水印技術(shù)的應(yīng)用領(lǐng)域 4
1.4本文主要工作 6
第二章 數(shù)字水印的基本理論 7
2.1數(shù)字水印系統(tǒng)的基本框架 7
2.2數(shù)字水印的分類 8
2.3數(shù)字水印技術(shù)的特性 10
2.4數(shù)字水印的攻擊方式 12
2.5數(shù)字水印技術(shù)的性能評(píng)價(jià) 14
2.6 本章小結(jié) 16
第三章 小波變換理論 17
3.1小波變換分析及其發(fā)展 17
3.2小波變換 17
3.3 連續(xù)小波變換 18
3.4 離散小波變換 18
3.5二維小波變換 19
3.6多分辨率分析 20
3.7小波變換的特性分析 21
3.8本章小結(jié) 22
第四章 基于小波變換的數(shù)字水印技術(shù)及其仿真實(shí)驗(yàn) 23
4.1基于小波變換的數(shù)字水印技術(shù) 23
4.1.1水印信息的嵌入 23
4.1.2水印信息的提取 24
4.2 MATLAB7.0簡(jiǎn)介 25
4.3實(shí)驗(yàn)仿真結(jié)果 26
4.3.1數(shù)字水印的嵌入與提取 26
4.3.2嵌入水印圖像與原圖的比較 27
4.3.3抗噪聲攻擊 28
4.3.4抗剪切攻擊 29
4.3.5抗旋轉(zhuǎn)攻擊 30
4.4 本章小結(jié) 30
第五章 總結(jié)與展望 31
5.1總結(jié) 31
5.2展望 31
致謝 33
參考文獻(xiàn) 34