臺灣博碩士論文加值系統

近年來，由於資訊科技快速的進步使得數位化資訊的運用就有如傳統紙筆的運用，逐漸地在生活之中被使用，尤其是多媒體資訊的使用更是廣泛及方便。除此之外加上網際網路的普及化以及頻寬不斷的提昇之下，意味著如聲音檔、圖檔以及影片等大容量之多媒體檔案在傳輸的問題上已經不再是困難的技術，但也由於如此方便及快速，使得非法盜用的狀況不斷發生，於是延伸出一些智慧財產權保護的問題，也就是說，就創作者而言要如何去證明自己的創作，要如何確保自己的創作不會被盜用或是要如何授權他人可以合法使用自己的創作且可以加以驗證等等，就成為創作者另一個重要思考的議題。尤其是多媒體的創作，由於工具的便利，而使得原創者的特徵性相對減低，也由於工具的便利，而使得其複製性相對提高，以致非法使用的情況相形容易發生。
數位浮水印 (Digital watermarking) 以及資訊隱藏 (Information hiding) 的技術正好為上述問題找到一條出路，數位浮水印及資訊隱藏的技術是利用在原始創作中加入不易被感知 (Imperceptible) 的資訊來做為著作權之識別、使用權之授與證明或是當作隱密資訊之傳遞。
本篇論文將針對聲音檔案 (Audio file) 提出以靜音區間 (Silence period) 為基礎之資訊隱藏方法，該方法是利用動態調整靜音區間的長度來達成隱藏資訊之目的及降低總播放長度之變化，且本方法在萃取隱藏資訊時並不需要原始聲音檔案或過多的資訊才能萃取隱藏資訊，而只是需要三個關鍵值即可進行隱藏資訊的萃取。在經過實驗之後，本文所提出的方法在適當的參數之下對於聲音檔案加入隱藏資訊之後，其總播放長度並未有改變，且不易感覺其聲音品質的改變。因此本方法可用於音樂創作者將授權使用資訊置入檔案中傳送給使用者，以利日後驗證使用者之合法性時使用，而且在加入隱藏資訊後對於聲音檔案之品質不會有太大的變化。

摘 要 ................................................i
第一章 研究主題背景與動機................................1
第二章 研究目的.........................................7
第三章 文獻探討.........................................8
3.1 數位浮水印...................................8
3.2 以壓縮技術為主之聲音檔案浮水印方法 .............10
3.3 以調整聲音檔案直流準位之聲音檔案浮水印方法......14
3.4 以無聲區間為主之聲音檔案浮水印方法.............16
第四章 本論文的聲音檔案資訊隱藏法........................19
4.1 隱藏資訊之加入...............................19
4.2 隱藏資訊之萃取...............................24
第五章 實驗分析與討論...................................26
5.1 第一部份實驗分析.............................26
5.1.1 加入資訊之容量...........................27
5.1.2 播放長度之變化量.........................27
5.1.3 檢測時所需之資訊量.......................27
5.1.4 聲音品質之影響及不可感知性................28
5.2 第二部份實驗分析.............................30
5.3 問題探討....................................31
5.3.1 資訊檢測值 Sd...........................31
5.3.2 資訊容量................................32
5.3.3 使用於調整長度之數值.....................33
第六章 結論...........................................34
參 考 文 獻...........................................35

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