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研究生:梁晉坤
研究生(外文):Liang Chin-Kuen
論文名稱:MPEG-4二維網目動畫在轉換域的浮水印技術
論文名稱(外文):Watermarking MPEG-4 2D Mesh Animation in the Transform Domain
指導教授:楊士萱楊士萱引用關係
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:資訊工程系碩士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:69
中文關鍵詞:數位浮水印二維網目動畫離散餘弦轉換離散小波轉換奇異值頻譜分解
外文關鍵詞:digital watermarking2D mesh animationdiscrete cosine transform (DCT)discrete wavelet transform (DWT)singular spectrum analysis (SSA)
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數位浮水印技術已經成功的應用於自然影像與視訊中。在另一方面,廣泛應用於虛擬實境、卡通與電影中的電腦動畫,也需要適當的著作權保護機制。在本論文中,我們發展MPEG-4二維網目動畫的強健性浮水印系統。我們使用了數種時間序列轉換技術,包括了離散小波轉換、離散餘弦轉換、以及奇異值頻譜分解,用來擷取網目運動的頻率成份。我們利用展頻技術將不可見的二元浮水印序列嵌入在重要的頻率成份中。在浮水印偵測時,我們使用了一個空間域的最小平方校正技術來解決網目偏移的問題。為了驗證浮水印系統的強健性,我們使用數種攻擊方式來測試浮水印系統,其中包括仿射轉換攻擊、平滑化攻擊、隨機雜訊攻擊、強化及衰減攻擊、解析層簡化攻擊以及時間扭曲攻擊。實驗結果顯示我們的浮水印系統確實可以抵抗上述的攻擊。我們也評估所提浮水印系統使用不同轉換的時間與儲存複雜度。
Digital watermarking techniques have been successfully applied to natural images and videos. On the other hand, the computer animation applied in virtual reality, cartoons, and movies may also need adequate copyright protection. In this thesis, we develop robust watermarking techniques for MPEG-4 2D mesh animation. We use several time-series transformation techniques, including discrete cosine transform (DCT), discrete wavelet transform (DWT), and singular spectrum analysis (SSA), to extract the spectral components of mesh movement. An invisible binary code watermark is added to the important components based on the spread-spectrum principle. At watermark extraction, a spatial-domain least-squares registration technique is used to restore the distorted mesh. A variety of attacks, including the affine transformation, smoothing, random noise, enhancement and attenuation, simplifying, and time warping, are used to verify the robustness of the proposed system. Experimental results show that our watermark system can withstand the aforementioned attacks. We also evaluate the time and storage complexity of the proposed watermarking system under different transformations.
中文摘要
英文摘要
誌謝
目次
表目錄
圖目錄
第一章 緒論
1.1 前言
1.2 數位浮水印概述
1.3 合成影像的數位浮水印
1.4 研究動機與論文組織架構
第二章 MPEG-4二維網目動畫及其轉換
2.1 MPEG-4二維網目動畫
2.1.1 MPEG-4介紹
2.1.2 MPEG-4二維網目動畫
2.2 離散餘弦轉換
2.3 小波轉換
2.3.1 小波轉換與多層解析
2.3.2 以濾波器組實現離散小波轉換
2.4 奇異值頻譜分解
第三章 MPEG-4二維網目動畫的浮水印技術
3.1 二維網目動畫浮水印技術發展的困難
3.2 二維網目動畫時間序列分解
3.2.1 為何要使用時間序列分解
3.2.2 各種轉換技術的時間序列分解
3.3 相關參數與名詞定義
3.4 浮水印的嵌入
3.5 浮水印的偵測
第四章 實驗結果
4.1 二維網目動畫的浮水印攻擊
4.2 各項實驗參數
4.3 實驗結果
4.3.1 隨機雜訊攻擊
4.3.2 時間扭曲攻擊
4.3.3 仿射轉換攻擊
4.3.4 平滑化攻擊
4.3.5 強化及衰減攻擊
4.3.6 解析層簡化攻擊
4.4 時間複雜度與空間複雜度分析
4.5 總評及說明
第五章 結論
參考文獻
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4.ISO/IEC 14496-3, Coding of Audio-Visual Objects: Audio.
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