臺灣博碩士論文加值系統

本研究在此提出了一個植基於DCT技術的浮水印方法，這個方法的主要目的在於強化浮水印的強健性，使其浮水印能夠承受JPEG壓縮攻擊。為了達成這個目的，本研究提出的浮水印方法，會將其浮水印嵌入至圖片的DCT係數中。為了使被浮水印圖片能保持在視覺可察覺差異的圖像品質，本研究使用了數學餘數的概念，將浮水印嵌入至圖片中低頻帶的DCT係數。除此之外，本研究在提出的方法中，應用了投票機制以提高浮水印的強健性。而實驗結果證實了針對於JPEG壓縮攻擊，本研究所提出的方法，其浮水印強健性比Patra等人以及Lin等人的浮水印方法還要優秀。

In this thesis, a DCT-based watermarking technique is proposed. This scheme is designed to increase its robustness of hidden watermark so that the hidden watermark can withstand JPEG compression attack. To achive our objective, the proposed watermark scheme embeds watermark into the DCT coefficients. To remain the visual quality of watermarked images, only low-frequency DCT coefficients are selected to carry hidden watermark by the concept of mathematical remainder. To enhance the robustness of the watermark, a voting mechanism is applied in the scheme. Experimental results confirm that the robustness of hidden watermark against JPEG compression with our proposed scheme is better than that of Lin et al.’s scheme and Patra et al.’s scheme.

摘要 i
ABSTRACT ii
致謝 iii
目錄 iv
表目錄 v
圖目錄 vi
第一章 緒論 1
1.1 研究背景與動機 1
1.2 研究方法 2
1.3 效能參考指標 3
1.4 論文架構 4
第二章 相關技術 5
2.1 Discrete Cosine Transform (DCT)與JPEG壓縮技術 5
2.2 其他相關的浮水印方法 9
第三章 本研究提出的浮水印方法 26
3.1 浮水印資訊嵌入工作 27
3.2 浮水印資訊取出工作 34
3.3 浮水印投票機制 36
第四章 實驗與比較結果 38
4.1 浮水印方法的實驗結果 39
4.2 使用投票機制的實驗結果 42
4.3 抗JPEG壓縮攻擊結果 43
4.4 比較及討論 45
第五章 結論 55
參考文獻 56

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