隨著網際網路與資訊科技的發達，電子圖片、信件、影片、聲音等多媒體以數位化形式快速在網路上流傳。網際網路的高普及提高了便利性，但也衍伸出許多非法的複製問題。其中以數位影像的智慧財產所有權被破壞尤為嚴重。資訊隱藏和技術驗證是防止有心者對數位影像故意破壞與認證的有效措施，數位浮水印即為其一重要技術。
頻域數位浮水印技術是目前較具強韌性的資訊隱藏方法，其中以離散餘弦轉換(Discrete Cosine Transform DCT)和離散小波轉換(Discrete Wavelete Transform DWT) 方式具最佳效能，本論文提出一新的基於DWT的浮水印資訊隱藏演算法方式，使用一維可逆式四捨五入小波轉換(RRODWT)進行浮水印的嵌入。其原理將浮水印與原圖像的整數小波轉換係數混和以達到資訊隱藏的效果。此方法不僅擁有高穿透性，且有別傳統將資訊隱藏於中頻區段方式，本論文將資訊藏於低頻。實驗結果得知，所提的新方法具有高強韌性，在多種攻擊下仍保有高辨識度。

With the development and progress of the internet and information technology, digital multimedia in digital form circulated on the Internet rapidly, such as digital image, email, video and voice. Widespread Internet make more convenient, but that also have lots of illegal copying issues. Include intellectual property rights of digital image are the most serious. Steganography and technical verification are effective measures for preventing somebody who want to attack digital image and security identifying certification ownership.
The frequency domain watermarking is the highest robustness steganography present and that especially including DCT and DWT. Based on DWT there is a new design proposed in this thesis. 1D- RRODWT imbed information of watermark. The steganography theory is mix wavelet coefficient of watermark and cover image. This new method not only has a high transparency but also not like traditional steganography of embed in middle-frequency. Steganography of this thesis is Embedding information in low-frequency. Experimental results show that new method still possess high robustness and high Unambiguousness when it was attacked.

中文摘要 i
ABSTRACT ii
誌謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
第一章 緒論 01
1.1 研究背景 01
1.2 研究動機與目的 02
1.3 論文架構 03
第二章 簡介數位浮水印 04
2.1 數位浮水印是什麼 04
2.2 原理與應用 05
2.2.1 需求考量 06
2.3 技術評估與準則 07
2.3.1. 影像尖峰訊號對雜訊比值 07
2.3.2. 正規化相關匹配法 08
第三章 基於RRODWT之資訊隱藏 09
3.1 簡介 09
3.2 浮水印隱藏方法 11
3.2.1. 嵌入前的RRODWT 11
3.2.2. 相似型浮水印嵌入 15
3.2.3. 連續型浮水印嵌入 21
3.3 浮水印取出步驟 26
第四章 實驗結果與結論 28
4.1 實驗平台 28
4.2 實驗數據 29
4.3 攻擊種類 31
4.4 實驗結果分析 35
4.4.1 實驗一 35
4.4.2 實驗二 41
4.4.3 實驗三 43
4.5 結論 44
參考文獻 45

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