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 可逆式浮水印技術為數位浮水印抽取後，能將影像還原至原始影像的技術。本論文提出一個高影像品質的可逆式浮水印技術。本方法首先將影像切割成非重疊之區塊後，計算區塊內中間像素與其他像素的差值，產生差距矩陣並計算其直方圖，再利用直方圖的最大量值進行位移嵌入。實驗結果顯示本方法能大幅提升原直方圖位移的嵌入量，並能保有良好的嵌入後影像品質。
 Reversible image watermarking techniques have attracted a lot attention recently and have provided a solution to the problem of image recovery. In this paper, a reversible image watermarking scheme based on histogram shift is proposed. Block differences of size 3×3 and 5×5 are proposed to raise the peaks of the histogram in each block. Absolute histogram shift is then applied to embed watermarks. Experimental results show that the proposed 5×5 block difference histogram method exhibits good in capacity and watermarked image quality.
 目錄摘要................................................................iAbstract............................... ............................ii誌謝..............................................................iii目錄...............................................................iv表目錄.............................................................vi圖目錄............................................................vii第一章 緒論.........................................................1 第一節 概論...................................................1 第二節 論文架構...............................................4第二章 文獻探討.....................................................5 第一節 差值擴張為基礎的可逆式浮水印技術.......................7 第二節 直方圖為基礎的可逆式浮水印技術.........................9第三章 以區塊差值直方圖為基礎之可逆式浮水印技術....................12 第一節 以33區塊差值直方圖可逆浮水印技術執行步驟.............12 3.1.1 嵌入演算法.....................................13 3.1.2 抽取演算法.....................................16 第二節 33區塊差值直方圖可逆浮水印技術範例...................18 第三節 以55區塊差值直方圖可逆浮水印技術執行步驟.............22 3.3.1 嵌入演算法.....................................23 3.3.2 抽取演算法.....................................26 第四節 55區塊差值直方圖可逆浮水印技術範例...................26第四章 實驗結果與比較..............................................30第五章 結論........................................................37 第一節 結論..................................................37 第二節 未來展望..............................................37參考文獻...........................................................38
 參考文獻[1]A.M. Alattar, “Reversible watermark using the difference expansion of a generalized integer transform,” IEEE Trans. on Image Processing, vol. 13, no. 8, pp. 1147–1156, 2004.[2]M.U. Celik, G. Sharma, A.M. Tekalp, and E.Saber, “Lossless Generalized-LSB Data Embedding,” IEEE Trans. on Image Processing, vol. 14, no. 2, pp. 253–266, 2005.[3]C.C. Chang and T.C. Lu,“A difference expansion oriented data hiding scheme for restoring the original host images,” the Journal of Systems and Software ,vol. 79, no.12, pp. 1754−1766, 2006.[4]C.C. Chang, W.L. Tai, and M.H. Lin,“A reversible data hiding scheme with modified side match vector quantization,” in Proceedings of the International Conference on Advanced Information Networking and Applications, vol. 1, pp. 947–952, Taiwan,2005.[5]M. Fallahpour and M.H. Sedaaghi,“High Capacity Lossless Data Hiding Based on Histogram Modification,”IEICE Electronics Express, vol. l4, no.7, pp. 205–210, 2007.[6]J.H. Hwang, J.W. Kim, and J.U. Choi,“A Reversible Watermarking Based on Histogram Shifting,”International Workshop on Digital Watermarking 2006, LNCS 4283, pp. 348–361, 2006.[7]A.Leest, M. Veen, and F. Bruekers,“Reversible imagewatermarking,” Proc. IEEE Int. Conf. Image Processing, vol. 2, pp. 157–160, 2002.[8]C.C Lee, H.C.Wu, C.S. Tsai and Y.P. Chu,“Adaptive lossless steganographic scheme with centralized difference expansion,” Pattern Recognition, vol. 41, pp. 2097–2106, 2008.[9]C.C. Lin, S.P. Yang and N.L. Hsueh,“Lossless Data Hiding Based on Difference Expansion without a Location Map,” 2008 Congress on Image and Signal Processing, vol. 2, pp.8–12,2008.[10]C.C Lin, W.L.Tai, and C.C Chang,“Multilevel reversible data hiding based on histogram modification of difference image, Pattern Recognition, vol. 41, pp. 3582-3591, 2008.[11]C.C. Lin, and N.L. Hsueh,“Hiding Data Reversibly in an Image via Increasing Differences between Two Neighboring Pixels,”IEICE Transactions on Information and Systems, vol.E90–D, no.12, pp. 2053–2059, 2007.[12]Z. Ni, Y.Q. Shi, N. Ansari and W.Su,“Reversible Data Hiding,”IEEE Transactions on Circuits and Systems for Video Technology, vol. 16, no. 3, pp. 354–362,2006.[13]W.L. Tai, C.M. Yeh, and C.C. Chang,“Reversible Data Hiding Based on Histogram Modification of Pixel Differences,” IEEE Transactions on Circuits and Systems for Video Technology, vol. 19, no. 6,pp. 906–910,2009.[14]D.M. Thodi and J.J. Rodriguez,“Reversible watermarking by prediction-error expansion,” Proceedings of the 6th IEEE Southwest Symposium on Image Analysis and Interpretation, vol. 3, pp. 21–25, Lake Tahoe,USA, 2004.[15]J.Tian,“Reversible data embedding using a difference expansion,”IEEE Transactions on Circuits Systems and Video Technology, vol. 13, no. 8, pp. 890–896,2003.[16]Piyu Tsai , Y.C. Hu and H.L. Yeh,“Reversible image hiding scheme using predictive coding and histogram shifting,” Signal Processing, vol. 89, pp.1129–1143,2009.[17]C.D. Vleeschouwer, J.E. Delaigle, and B. Macq, “Circular interpretation of histogram for reversible watermarking,”Proceedings of the IEEE 4th Workshop on Multimedia Signal Processing, pp. 345–350, France, 2001.[18]B. Yang, M. Schmucker, C. Busch, X. Niu, and S.Sun,“Approaching optimal value expansion for reversible watermarking,” Proceedings of the 7th Workshops on Multimedia and Security, pp. 95–102, USA, 2004.[19]B. Yang, M. Schmucker, X. Niu, C. Busch, and S.Sun,“Reversible image watermarking by histogram modification for integer dct coefficients,”Proceeding of the IEEE 6th Workshop on Multimedia Signal Processing, pp. 143–146, Siena, Italy, 2004.
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