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  • 學位論文

離散分數隨機轉換之研究

Research on Discrete Fractional Random Transform

指導教授 : 許文良

摘要


近年來, 不論是文字、影像或聲音等資訊, 皆大量的被數位化。加上網路的普及和速度上的提升,使得資訊的流通與複製大為便利,在短短的數秒或數分鐘內, 資訊可能就已被傳送到遠方使用者的手中,甚至被複製了許多次。以資訊傳遞與保存的觀點來看,數位化的確是一大優點, 然而這也帶來了兩個大問題,第一,智慧財產權的侵權問題。第二, 資訊保密的部分。 有研究提出離散分數隨機轉換(discrete fractional random transform, DFRNT),此轉換除了具有一些優異的數學特性,例如線性、可加性、週期性等,加上此轉換本身具有的隨機特性, 可以將資訊作加密, 也可以將此轉換使用於數位浮水印的應用上。DFRNT 在轉換的同時,就已經有了加密的效果,比起其他的轉換,可減少另外需要的加密程序,在減少計算量與複雜度上都很有幫助。站在此基礎上, 我們希望把DFRNT 往多參數做延伸, 希望推廣出多參數離散分數隨機轉換(multiple-parameter discrete fractional random transform, MPDFRNT),此MPDFRNT 除了能延續DFRNT 的優異數學性質, 在加密以及浮水印的應用上,也能擁有更好的效果。

並列摘要


In recent years, texts as well as pictures and music are transformed to digital information more frequently. And because internet is more popular and faster than before, it is easier and faster to copy and transmit information in few seconds. Digital information is advantageous for transmitting and storing, but it also makes two big problems. The first is copyright protection, and the second is data security. The existing research of discrete fractional random transform (DFRNT) shows that it has several excellent mathematical properties, e.g. linearity、additivity and periodicity. The DFRNT has random properties, thus it can transform and protect data security at same time. This is better than other transforms that need other steps for encryption if we want to protect data. DFRNT also can be used in digital watermarking. Because DFRNT has many good properties, we want to extend it to multiple-parameter discrete fractional random transform (MPDFRNT). The resulting MPDFRNT is better than DFRNT for applications in information security and digital watermarking.

參考文獻


[10]柯建羽轉 換 域 數 位浮水印之研究, 中 原 大 學 電機工程學系
[12]Zhengjun Liu, Shutian Liu, and Muhammad Ashfaq Ahmad,
[2] Soo-Chang Pei and Wen-Liang Hsue, "The Multiple-Parameter
fractional random transform," Optics Communications, vol. 255, pp.
Discrete Fractional Transform," IEEE Signal Processing Letters, vol.

被引用紀錄


蔡豐懋(2014)。離散分數傅立葉轉換在影像浮水印之應用〔碩士論文,中原大學〕。華藝線上圖書館。https://doi.org/10.6840/cycu201400870
蔡敏廣(2006)。我國中央機關組織法制之研究--以中央行政機關組織基準法為核心〔碩士論文,國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2006.02655

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