臺灣博碩士論文加值系統

隨著科技的高度發展及網路大眾化，現代人幾乎每天都會使用網路，網路上的資料傳輸也越來越多。而資料傳輸的過程中可能會被他人竊取，所以要如何讓資料安全無虞的傳送到接收端是個值得思考的議題。常見的兩種解決方案分別為利用密碼學或資料隱藏來達到其目的。而其中資料隱藏方法主要是將機密資料嵌入載體影像，儘量讓藏匿過後的偽裝影像與原載體影像相似，則機密資料能在偽裝影像的掩護下傳遞而不被察覺，已達到資料安全性及隱匿性目的。
在本論文中，擬提出兩種基於模數函數的資料隱藏方法；一是將新型龜殼資料隱藏法的藏匿方式公式化，原本方法中需要額外的記憶體儲存參考矩陣，以及需要在參考矩陣內尋找所要藏入的訊息的方式是用查表的方式進行藏匿，這樣的藏匿方式會比較繁瑣。因此提出此方法的通式與演算法，同樣讓像素的調整量在固定範圍內以及圖像品質維持在人眼不容易辨識出的程度。另一種資料隱藏法則是提出植基於通式化FFEMD方式，其主要的做法就是在隱藏時僅能使用兩個像素為一組變為三個像素以上為一組來進行藏匿，也就是說不再局限於兩個像素為一組的條件下來做資料隱藏。最後經過實驗模擬，証實本方法除了隱藏品質及藏量皆與FEMD相同之外，同時又增加使用者可自由選擇隱藏時所需像素點數之功能。

With the rapid development of science and technology and the popularity of network, modern people almost use the Internet everyday. The amount of data transmission are growing at a rapid rate, but data may be stolen by other people during the transmission. So, How to transfer data to receiver safely is a worth thinking issue. The two common solutions are using cryptography or data hiding to achieve the goal. The data hiding scheme is mainly that embedding secret data in the cover image and keep the stego-image after embedding similar to the cover image. Therefore, the secret data can not be aware in order to achieve the security and imperceptibility.
In this paper, two data hiding schemes based on modulus function are proposed. First is formulating the embedding process of new shell data hiding scheme. The original scheme requires additional memory to store reference matrix, and it needs lookup table to find the secret data in the reference matrix for embedding. The embedding process is complicated. Therefore, both the formula and algorithm of proposed scheme make the adjustment of pixels in fixed range and keep the image quality is not easily identified by naked eyes. Another data hiding scheme is based on generalized FFEMD. The main idea is extending the pixel group from two pixels to three or more pixels. That is no longer limited to two pixels in a group for data hiding. After the experimental simulation, we confirm that the capacity and image quality of our scheme are the same to FFEMD. Besides, the user can choose the number of pixels in group freely.

摘要 i
ABSTRACT ii
誌謝 iii
目錄 iv
圖目錄 vi
一、緒論 1
1.1 研究背景 1
1.2 研究動機 2
1.3 資料隱藏技術特性 2
1.4 研究目的 3
1.5 論文架構 3
二、相關研究 4
2.1 EMD(Exploiting Modification Direction)方法[3] 4
2.1.1 EMD資料隱藏技術[3]藏匿與取出步驟 5
2.1.2 EMD資料隱藏技術[3]之實例 5
2.2 GEMD(General EMD)方法[12] 7
2.2.1 GEMD資料隱藏技術[12]藏匿與取出步驟 7
2.2.2 GEMD資料隱藏技術[12]之實例 8
2.3 龜殼資料隱藏法[14] 10
2.4 FFEMD(Formula of FEMD)方法[10] 12
2.4.1 FFEMD資料隱藏技術[10]藏匿與取出步驟 12
2.5小結 14
三、擴增藏量龜殼藏匿演算法 15
3.1 擴增藏量龜殼資料藏匿演算法之藏匿與取出步驟 16
3.2 擴增藏量龜殼資料藏匿演算法之實例 18
3.3溢位處理 19
四、FFEMD像素擴增資料隱藏技術 20
4.1 FFEMD(Formula of FEMD)像素擴增資料隱藏技術 20
4.1.1 FFEMD像素擴增資料隱藏技術藏匿與取出步驟 20
4.1.2FFEMD像素擴增資料隱藏技術之實例 21
五、實驗結果與分析 23
5.1影像品質定義 23
5.2實驗資訊 24
5.3 EMD相關技術之分析與比較 24
5.4方法一與龜殼資料隱藏法比較 26
5.5方法二與FFEMD[10]比較 27
5.6 MSE推估 27
5.6.1方法一MSE推估 28
5.6.2方法二MSE推估 29
結論與未來展望 30
參考文獻 31

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