臺灣博碩士論文加值系統

本篇論文是植基於JPEG2000影像壓縮技術提出一種簡單且具有強大能力偵測影像竄改錯誤的方法。其中以在JPEG2000影像壓縮過程中的離散小波轉換 （DWT） 所產生之低頻係數（即LL頻帶）為系統欲隱藏的浮水印資訊，並將此浮水印進行循環冗餘檢驗碼（CRC）編碼，透過交錯技術選擇資料隱藏的位置，藉以避免重複藏入浮水印攻擊及碼字資訊遺失問題，最後再將編碼後的碼字藏入欲保護的影像。藉由此頻帶的資料與原始影像之空間相關性及循環冗餘檢驗碼的強大偵錯能力這兩項重要特性，達到資料竄改偵測的能力，並且利用失真補償技術降低碼字藏入後所造成的失真程度，使其在影像重建後達到最佳的影像品質。根據實驗結果顯示，我們所提出的這個方法，即使在影像遭受到很大的區域竄改，也能夠正確的偵測出遭受到竄改的區域，並且能夠維持不錯的影像品質。

第一章　緒論 1
1.1　研究動機及目的 1
1.2　論文架構 2
第二章　文獻回顧 3
2.1　JPEG2000的基本介紹 3
2.1.1　前置處理與色相轉換 4
2.1.2　離散小波轉換 6
2.1.3　量化 10
2.1.4　熵編碼 12
2.2　影像竄改偵測技術回顧 13
第三章　JPEG2000影像竄改偵測與還原技術 20
3.1　竄改偵測與還原演算法 20
3.1.1　浮水印選取 21
3.1.2 浮水印編碼 24
3.1.3　交錯 27
3.1.4　碼字藏入 39
3.1.5　失真補償 42
3.1.6　碼字擷取與計算循環冗餘檢驗碼徵狀 46
3.1.7　錯誤區塊顯示與錯誤回復 49
3.2　交錯技術與碼字資訊遺失之探討 54
3.3　循環冗餘檢驗碼之碼率探討 60
3.4　實驗結果與探討 65
第四章　通道雜訊對系統之影響 98
4.1　通道雜訊對系統竄改偵測與還原能力之探討 99
第五章　結論 108
參考文獻 109

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