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小波轉換為基礎的強健型版權保護浮水印之研究
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| 作者 |
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藍勝宇 |
| 學校系所 |
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國立台北科技大學電腦與通訊研究所 |
| 地點 |
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全臺 全部
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| 研究內容 |
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[ 摘要 ]
由於數位化時代的來臨以及網際網路使用上的普及，使得數位化型式的媒體可以很輕易地遭到竄改、複製和散佈，進而造成原著作者或是版權擁有者的權益受到損害。於是保護數位化資訊的智慧財產權也日漸受到重視，因為數位浮水印是個簡單而且有效的數位化媒體智慧財產權的保護方式，所以近年來已有許多的學者投入了相當多的研究在數位浮水印的領域之中。
在本論文中提出的強健型及盲目取出之浮水印方法，主要是應用於保護數位化靜態影像的智慧財產權，此方法基本上是利用小波轉換，分別針對位於不同頻帶小波係數特性上的差異，而分別使用(1)以通訊觀念為基礎的Lattice codes編碼方式；(2)以失真察覺臨界值(JND, Just Noticeable Distortion)為基礎的不重要係數修改法；(3)以奇異值分解(SVD, Singular Value Decomposition)之量化調變(QIM, Quantization Index Modulation)等三種方法，並且在浮水印嵌入之前使用Arnold轉換對浮水印進行置亂處理以增加浮水印的安全性。在能夠維持原來影像不被破壞的前提之下，而達到嵌入強健型浮水印的目的。從實驗結果可知，本論文所提出的浮水印方法，可以抵抗各式影像失真壓縮的攻擊、常用的影像處理攻擊以及幾何方式的攻擊。另外，由於本方法是盲目取出的浮水印方法，也就是在取出浮水印時不需要原始影像或是與其所相關的資訊，只需要嵌入參數即可取出浮水印，所以是個非常方便且實用性高的浮水印方法。
[ 英文摘要 ]
Because of the arrival of digital world, media in digital form can be easily altered, duplicated and spread which causes the rights and interests of original author and copyright owner are compromised or destroyed. Therefore, the protection of the intellectual property rights of digital information has come to attention. Digital watermark provides a simple and effective way of protection for property of the kind. Nowadays, more and more studies have been thrown to the field of digital watermark.
In this thesis, a method of robustness and blind extraction watermark has been put forward. The main purpose of this method is to protect the intellectual property right of static images. The basic concept is to utilize wavelet transformation where, according to different characteristic coefficient on different band, three methods will be applied respectively as following.
1. Lattice code based on communication principle
2. Insignificant coefficient based on JND of human visual model
3. Quantization Index Modulation based on SVD
The three methods above will achieve the goal of embedding watermark on the premise of keeping image fidelity.
The experimental results prove that the proposed method presented in this thesis will have immunity to the attacks of various image compression, commonly used image processing methods and geometric methods. Additionally, because this approach is blind watermark, which means neither original image and nor its related information is needed, it is a very convenient and practical method of watermark.
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