基于MATLAB的數字水印算法研究與實現

電子通信論文編號:TX234  論文字數:20072,頁數:34 有開題報告和任務書，文獻綜述，外文翻譯。

目    錄

引   言 1
第1章 緒論 2
1.1 數字水印的背景與意義 2
1.2 數字水印的定義與分類 2
1.3 數字水印應用現狀和發展方向 3
第2章 數字圖像水印技術 5
2.1 數字圖像的定義 5
2.2 人類視覺系統對數字圖像的感知特性 5
2.3 數字圖像水印系統的模型與算法 8
2.3.1 數字圖像水印系統的模型 8
2.3.2 數字水印常見算法原理 9
2.3.3 數字圖像水印的一個具體算法 11
第3章 Matlab7.0介紹 14
3.1 MATLAB簡介及發展歷史 14
3.2 MATLAB7.0安裝和啟動 15
3.2.1 安裝MATLAB7.0 15
3.2.2 啟動MATLAB7.0 16
3.3 MATLAB優點和特點 17
3.4 MATLAB在圖像處理應用實例 19
第4章 數字圖像水印實現 21
4.1 水印生成 21
4.2 水印的嵌入 22
4.3 水印信息的檢測 23
結論與展望 25
致    謝 27
參考文獻 28
附錄A 一篇引用的外文文獻及其譯文 29
附錄B 主要參考文獻及其摘要 34

摘    要

 數字水印的基本思想是在原始媒體數據中，如音頻、視頻、圖像等，隱藏具有一定意義的附加信息作為標記，這些信息與原始數據緊密結合，并隨之一起被傳輸。在接收端，通過計算機水印信號被提取出來用于各種目的，可能的應用包括數字簽名、數字指紋、廣播監視、內容認證、拷貝控制和秘密通信等。本次論文任務主要是對圖像信號實現數字水印,過程首先是對圖像信號加入水印信息,接下來對數字水印信息進行檢測抽取, 最后對嵌入水印的圖象進行不同的攻擊，測試水印的魯棒性。整個過程是通過Matlab軟件運行實現。
 與加密技術不同，數字水印技術并不能阻止盜版活動的發生，而是通過檢測在數字載體中加入的獨特記號，即從中提取水印以監視被保護數據的傳播、鑒別數據的真偽、解決版權糾紛及為法庭提供證據等。由于數字作品是在非加密狀態下進行傳遞的，作為水印的信息通常是不可見不可察覺的，但通過一些算法可以進行檢測或提取。
 數字水印技術是通過對媒體數據做微量修改來嵌入水印信息，從而達到信息隱藏的目的。該過程不影響原來數據的正常使用，不改變原來數據量的大小，不改變媒體的外觀。該技術在軍事通信、國家信息安全、數字化網絡、多媒體及印刷出版領域都具有十分廣闊的應用前景。

關鍵詞：數字水印；Matlab；信息隱藏；頻域法；魯棒性；

Digital Watermarking Algorithm Research and Implementation based on Matlab
Abstract

 The basic idea of digital watermarking in the original media data, such as audio, video, images and so on, to hide a certain significance as a marker of additional information, the information and raw data are closely linked together and then transfer. At the receiving end, the computer signals are extracted watermark for various purposes, possible applications include digital signatures, digital fingerprints, broadcast monitoring, content authentication, copy control and secret communications. The main task of this paper is a digital watermark       image signal, the process is the first image signal by adding a watermark information, the next to detect digital watermark information extraction, the final image of the embedded watermark different attacks, the test of robust watermark sexual. The entire process is run through the realization of Matlab software.
 And encryption technologies, digital watermarking technology and will not prevent the occurrence of piracy, but by detecting in the digital carrier to add a unique mark, that is extracted from the watermark data to be protected in order to monitor the spread of the authenticity of identification data to resolve the copyright dispute and provide evidence for the court. Due to the number of entries is carried out under a state of non-encrypted transmission, as the watermark information is usually not visible (Invisible) or non-detect (Imperceptible), but through a number of algorithms can be detected or extracted.
 Digital watermarking technology is done through micro-media data modified to embed watermark information, so as to achieve the purpose of information hiding. The process does not affect the normal use of the original data, the amount of data does not change the size of the original, do not change the appearance of the media. The technology in military communications, the national information security, digital networks, the field of multimedia and print publishing are very broad application prospects.
 
Keywords: Digital watermarking; Matlab; Information Hiding; Frequency domain method; Robustness;