Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/19219
標題: 藏匿於多重頻率域具強韌性質的數位浮水印技術
A Robust Image Watermarking Scheme in Multiple Frequency Domains
作者: 張家銘 
Chang, Chia-Ming 
關鍵字: Digital watermarking;數位浮水印;Discrete Wavelet Transform;Discrete Fourier Transform;Visual Cryptography;離散小波轉換;離散傅利葉轉換;視覺密碼學
出版社: 資訊科學研究所
摘要: 
本篇論文主要是設計一個新型的數位浮水印技術,其目的是為了保障影像的版權擁有者及購買者(使用者)的權益。在設計上,我們提出來的方法具有兩個重要的特性。其中一個特性,使用視覺密碼學產生分享影像來做為浮水印,滿足了以往難以同時存在的兩個條件:公開驗證及保證浮水印的安全。另外一個特性,將分享影像嵌入影像的不同頻率域中,使得我們的數位浮水印技術能夠抵抗影像處理及幾何失真兩種類型的攻擊。結合以上特點,再經由實驗結果證明,我們所提出的方法不僅具有很好的影像品質(透明性),且經由影像攻擊之後,浮水印仍然具有很高的強韌性。另外在萃取浮水印時,不必藉由原始影像輔助即可完成。

In this thesis, a new robust blind watermarking scheme based on double frequency domains, DWT and DFT, is proposed. In order to protect the rights of legal buyer and seller, we encode the watermark into shares in Visual Cryptography. Then shares are embedded in DWT and DFT domain respectively to protect the image from image processing attacks or geometric distortion attacks. The scheme is robust under a public authentication environment, which has been ignored by most researchers. Experimental results show that the proposed scheme meets the features mentioned above with good quality of watermarked image. Furthermore, the watermark can be extracted without the original image.
URI: http://hdl.handle.net/11455/19219
Appears in Collections:資訊科學與工程學系所

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