適用於H.264/AVC之快速且強韌的浮水印技術｜國立清華大學博碩士論文庫

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研究生：	李勃延 Po-Yen Lee
論文名稱：	適用於H.264/AVC之快速且強韌的浮水印技術 Fast and Robust Watermarking for H.264/AVC In the Compressed Domain
指導教授：	張隆紋 Long-Wen Chang
口試委員:
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 資訊系統與應用研究所 Institute of Information Systems and Applications
論文出版年：	2006
畢業學年度：	94
語文別：	英文
論文頁數：	35
中文關鍵詞：	H.264 、浮水印、壓縮域
外文關鍵詞：	H.264, watermarking, compressed domain
相關次數：	點閱：1 下載：0
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為了能夠有效保護數位內容的版權擁有者，嵌入浮水印正是避免惡意散佈的方法之一。因此，本篇論文所提出的浮水印嵌入技術正是針對H.264所探討的。雖然H.264具有極良好的壓縮效率，但是其編碼過程卻是非常的緩慢，相當費時。因此我們所要提出的這個方法，其中之一的特點就是快速。這個演算法將浮水印隱藏在頻率域當中。當影像在H.264中經過離散餘弦轉換並量化之後，藉由改變部份中、高頻係數的正負值，來達到嵌入資訊的目的。基於此演算法僅有少數的判斷以及數值修改，沒有任何複雜的運算式存在，所以嵌入的速度將會非常地快速。另外，再加上多數決的運用，更是強化了浮水印的強韌度。實驗結果顯示，我們的方法不會造成大量的計算負擔，而且藏入浮水印後的影像串流大小也僅增加一點點而已，甚至在某些情況下還會減少其位元數。浮水印本身亦能抵抗重複壓縮或是常見的訊號處理攻擊。

In this paper, a fast and robust watermark embedding algorithm for H.264 is proposed. This algorithm embeds the watermark in the compressed domain. After the coding block is transformed by DCT (discrete cosine transforms) and quantized, it modifies the sign information of the AC coefficients in the middle frequency and high frequency ranges to embed the watermark. The experimental results show that our watermarking method has higher watermarking capacity than the conventional watermarking methods for H.264/AVC. Also, it doesn’t cost much execution time and the bit-rate of the video sequence increase very little. The watermark is robust against transcoding and common signal processing attacks.

ABSTRACT (in Chinese).......................................................i
ABSTRACT (in English)……...............................................ii
ACKNOWLEDGEMENT....................................................iii
List of Contents.....................................................................iv
List of Figures.......................................................................vi
List of Tables......................................................................viii
Chapter 1 Introduction............................................................1
Chapter 2 Preliminaries..........................................................3
Chapter 3 The Proposed Method............................................6
3.1 Introduction...........................................................................6
3.2 Watermark Embedding.........................................................8
3.3 Watermark Extracting.........................................................12
Chapter 4 Experimental Results and Discussion..................15
4.1 Introductions.......................................................................15
4.2 Effect on Video Stream......................................................17
I. PSNR.............................................................................17
II. Bit-rate..........................................................................22
III. Execution Time...........................................................22
4.3 Robustness..........................................................................24
I. Transcoding with QP Controlled...................................26
II. Transcoding with Bit-rate Controlled..........................26
III. Common Signal Processing........................................26
4.4 Comparison........................................................................30
Chapter 5 Conclusion..........................................................32
Reference.............................................................................33

                                

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