利用離散餘弦轉換與錯誤控制方法作數位浮水印

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吳皇欣(Huang-Hsin Wu) 查詢紙本館藏

畢業系所

資訊工程學系

論文名稱

利用離散餘弦轉換與錯誤控制方法作數位浮水印
(Digital Watermarking using DCT and Error Control Scheme)

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摘要(中)

隨著通訊網路的快速發展，多媒體的檔案能夠輕鬆地被大眾廣為流傳、散播。由於數位產品相當容易遭到複製，所以未被授權的複製品和電子文件將會是真正的挑戰。為了防止非法剽竊的行為且保障合法認證不被侵犯，數位浮水印技術是相當迫切需要的。
我們提出了一個結合兩個方法的系統，一方面是將二值化後的浮水印影像，利用修改經過量化後的中頻係數來作隱藏，另一方面是使用錯誤更正方法，也就是Reed-Solomon codes，來增加對於非法的攻擊之強韌性。前者的方法具有能夠在經過破壞性的壓縮後仍能倖存的能力，其中的破壞性壓縮如：JPEG或JPEG2000；而後者則能夠抵抗突發性或連續性的雜訊，像是影像處理中的裁切，且還可能對於前面提到的對破壞性壓縮的抵抗力有所助益。實驗的結果證實了我們提出數位浮水印方法的可行性與可靠性。

摘要(英)

The rapid growth of communication networks allows the widespread distribution of multimedia data in various ways. Since the digital productions are easy to be duplicated, the discouraging unauthorized clone and the illegal distributing of electronic documents are the issues that have to be resolved. For the purpose of protection against the pirate, digital watermarking techniques are emerged to defend the authentication to be infringed.
In this thesis, we present a combined approach that embeds a binary watermark by selectively modifying the quantized middle-frequency coefficients and use an error control scheme, namely Reed-Solomon codes, to increase the robustness of prevention of illegal attacks. The former is capable of surviving in the lossy compression, such as JPEG or JPEG2000, and the latter owns the ability of resisting burst noise, such as image cropping while increasing the affection of the former.
Experimental results demonstrate that our proposed digital watermarking approach is feasible and effectiveness.

關鍵字(中)

★ 理德-索羅門碼
★ 錯誤控制
★ 離散餘弦轉換
★ 資料隱藏
★ 數位浮水印

關鍵字(英)

★ Reed-Solomon Code
★ Error Control
★ Discrete Cosine Transform
★ Data Hiding
★ Digital Watermark

論文目次

Chapter 1 Introduction 4
1.1 Motivation 4
1.2 Basic watermarking principles 5
1.3 System overview 7
1.4 Organization of thesis 10
Chapter 2 Related Works 12
2.1 Related survey of watermark 12
2.2 Related survey of error control schemes 14
Chapter 3 Proposed Watermarking Algorithm 17
3.1 Embedding Method 17
3.1.1 Discrete Cosine Transform 17
3.1.2 Quantization 19
3.1.3 Reed-Solomon Codes 21
3.1.4 Shuffling 31
3.1.5 Embedding Process 31
3.1.6 Inverse DCT 34
3.2 Extracting Method 35
Chapter 4 Experimental Results 36
4.1 Experimental environment 40
4.2 Experimental result 1 42
4.2.1 Image cropping operation 42
4.2.2 Image blurring operation 44
4.2.3 JPEG 47
4.2.4 JPEG 2000 49
4.3 Experimental result 2 52
4.3.1 Image cropping operation 53
4.3.2 Image blurring operation 54
4.3.3 JPEG 55
4.3.4 JPEG2000 57
4.4 Experimental result 3 59
4.4.1 Image cropping operation 60
4.4.2 Image blurring operation 61
4.4.3 JPEG 62
4.4.4 JPEG2000 64
Chapter 5 Conclusions and Future works 66
5.1 Conclusions 66
5.2 Future works 67
References 68

參考文獻

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Page(s): 55 -68
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[11] H. Liu, H. Ma, M. El Zarki, and S. Gupta, “Error control schemes for networks: An overview,” ACM Mobile Networking and applications (MONET), vol. 2, no. 2, pp. 167-182, 1997.
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[13] Sklar, B., “Digital Communications: Fundamentals and Applications” Second Edition (Upper Saddle River, NJ: Prentice-Hall, 2001).
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指導教授

范國清(Kuo-Chin Fan)

審核日期

2002-7-8

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