本論文提出一個使用 H.264 畫面間預測的移動向量之特性，來實現資訊隱藏技術。
由於畫面與畫面之間，會記錄兩個畫面間之移動向量，即會儲存該畫面與參考畫面的移 動資訊，利用前一個參考畫面，加上每一個方塊的移動向量，建立出一個目前畫面的預 測畫面，故利用修改移動向量來達到資訊隱藏的目的。
我們提出之方法，在修改藏入資訊之後，影像品質只有略微的下降，細節紋理無大 幅度的變化，人眼視覺效果無法察覺，不易讓有心人士察覺，進而破壞或去除藏入的訊 息，且在浮水印取出的過程中，不需要與原始資料做比對，即可取出浮水印，且有極佳 的藏量。
第二節 未來研究方向
H.264/AVC視訊編碼其高壓縮效能及壓縮品質正是一種優良的壓縮標準，且被廣泛 使用，為了達到壓縮的目的，H.264視訊壓縮利用畫面內預測來消除畫面內的空間冗餘 性，以畫面間預測來消除畫面與畫面間的冗餘性。
近年來對於H.264的壓縮格式之研究也與日俱增，本論文的方法是利用修改畫面間 預測移動向量的部分，修改其移動資訊，藉由修改移動向量之位移來達到資訊隱藏的目 的，未來研究工作可以利用本篇成果為基礎，加強影像品質，或浮水印效能，甚至未來 可以嘗試在H.264之壓縮標準之技術的其他部份著手，不管是修改空間域像素或頻率域 轉換後DCT係數、移動向量、或CAVLC編碼等。
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參考文獻
[1] 張真誠、黃國峰、陳同孝，電子影像技術(Electronic Imaging Techniques)，松崗電腦 圖書資料股份有限公司，2000 年 12 月.
[2] 陳同孝、張真誠、黃國峰，數位影像處理技術(Digital Image Processing Techniques)，
松崗電腦圖書資料股份有限公司，2001 年 1 月.
[8] P. Dong, J.G. Brankov, N.P. Galatsanos, Y. Yang and F. Davoine, ”Digital Watermarking Robust to Geometric Dist rti ns,” IEEE Trans. Image Processing, vol. 14, pp. 2140 -2150, Dec. 2005.
[9] F. Hartung and M. Kutter, “ u time ia Watermarkin Techniques,” I Proceedings on Protection of Multimedia Content, vol. 87, pp. 1079-1107, 1999.
[10] C. . Lu an H.Y. . Lia , “ u tipurpose Watermarking for Image Authentication and Pr tecti n,” IEEE Trans. Image Processing, vol. 10, pp. 1579-1592, Oct. 2001.
[11] M.U. Celik, G. harma, . a er, an A. . Teka p, “Hierarchica Watermarkin f r Secure Ima e Authenticati n With L ca izati n,” I Trans. Ima e r cessin , v . , no. 6, pp. 585-595, June 2002.
[12] Y.K. Lee, L.H. Chen, “High Capacity Image Steganography,” IEEE Proceedings on Vision Image, and Signal Processing, vol. 147, no. 3, pp. 288-294, 2000.
[13] Y.S. Kim, O.H. Kwon, an . ark, “Wave et Base Watermarkin eth f r Di ita Ima es Usin the Human Visua ystem,” ectr nics Letters, v .3 , n .6, pp. 66-468, Mar. 1999.
[14] C.S. Lu, S.K. Huang, C.J. Sze, and H.Y.M. Liao, “Cocktail Watermarking for Digital Image Protection,” IEEE Transactions on Multimedia, vol. 2, no. 4, Dec. 2000.
44
The Journal of Systems and Software 50, pp.107-116, 2000.
[18] C.S. Lu, an H.Y. . Lia , “ tructura Di ita i nature f r Ima e Authenticati n: An pp. 285-287, May 2006.
[21] ITU-T Recommendation H.264. Advanced video coding for generic audiovisual 36 services, Nov. 2003.
[22] ITU-T：http://www.itu.int/ITU-T Accessed 18 June 2013.
[23] ISO/IEC：http://www.standardsinfo.net/ Accessed 18 June 2013.
[24] “Draft ITU-T recommendation and final draft international standard of joint video specification (ITU-T Rec. H.264/ISO/IEC 14486-10 Joint Video Team (JVT) of ISO/IEC MPEG and ITU-T VCEG, ” JVT-G050, 2003.
[25] H. Kalva, “The H. 6 Vi e C in tan ar ,” IEEE Transaction on Multimedia, vol.
13, pp. 86-90, 2006.
[26] I. E. G. Richardson, H.264 and MPEG-4 Video Compression: Video Coding for Next Generation Multimedia, first ed. John Wiley and Sons, 2003.
[27] I. E. G. Richardson, The H.264 Advanced Video Compression Standard, seconded. John Wiley and Sons, 2010.
[28] J. Zhang, J. Li, and L. Zhang, “Video Watermark Technique in Motion Vector,” In Proceedings of XIV Brazilian Symposium on Computer Graphics and Image Processing, pp. 179-182, Oct. 2001.
[29] A. Puria, X. Chenb, and A. Luthrac, “Vi e Coding Using the H.264/Mpeg-4 AVC
45
Compression Standard,” In Signal Processing: Image Communication 19, pp. 793-849, 2004.
[30] X.J. Ma, Z.T. Li, H. Tu, and B. Zhang, “A Data Hiding Algorithm for H.264/AVC Video Streams without Intra-Frame Distortion Drift,” IEEE Transactions on Circuits and Systems for Video Technology, pp. 1320-1330, Oct 2010.
[31] C.H. Kung, J.H. Jeng, Y.C. Lee, H.H. Hsiao, and W.S. Chen , “Vi e Watermarkin Using Motion Vector,” in 16th IPPR Conference on computer vision, graphics and image processing, pp. 547-551, 2003.
[32] P. Wang, Z. Zheng and J. Ying, “A Novel Video Watermark Technique in Motion Vectors,”
in ICALIP International Conference on Audio, Language and Image Processing, 2008 [33] JM http://iphome.hhi.de/suehring/tml/ Accessed 18 June 2013.
[34] H.264 Advanced Video Coding http://www.vcodex.com/h264.html Accessed 18 June 2013.
[35] T.J. Lin, K.L. Chung, P.C. Chang, Y.H. Huang, H.Y. M. Liao, and C.Y. Fang, “An Improved DCT-based Perturbation Scheme for High Capacity Data Hiding in H.264/AVC Intra Frames,” The Journal of Systems and Software , pp. 604-614, 2013.
[36] W. Huo, Y. Zhu, and H. Chen, “A Controllable Error-Drift Elimination Scheme for Watermarking Algorithm in H.264/AVC Stream,” IEEE Signal Processing Letters 18 , pp. 535-538, Sep. 2011.
[37] J.M. Thiesse, J. Jung, M. Antonini, “Data Hiding of Motion Information in Chroma and Luma Samples for Video Compression,” IEEE Multimedia Signal Processing, pp.
217-221, 2010.
[38] J.M. Thiesse, J. Jung, M. Antonini, “Rate Distortion Data Hiding of Motion Vector Competition Information in Chroma and Luma Samples for Video Compression,” IEEE Transactions of Circuits and Systems for Video Technology, pp. 729-741, 2011.
[39] D.W. Kim, Y.G. Choi, H.S. Kim, J.S. Yoo, H.J. Choi, Y.H. Seo, “The Problems in Digital Watermarking into Intra-Frames of H.264/AVC,” Image and Vision Computing, vol. 28, pp. 1220-1228, Aug. 2010.
[40] X. Li, H. Chen, D. Wang, T. Liu, G. Hou, “Data Hiding in Encoded Video Sequences Based on H.264,” IEEE International Conference on Computer Science and Information Technology, vol. 6, pp. 121-125, 2010.
[41] Y. Li, H.X. Chen, Y. Zhao, “ A New Method of Data Hiding Based on H.264 Encoded Video Sequences,” IEEE International Conference on Signal Processing , pp. 1833-1836, 2010.
46
[42] A. Mansouri, A.M. Aznaveh, F. Torkamani-Azar, F. Kurugollu, “A Low Complexity Video Watermarking in H.264 Compressed Domain,” IEEE Transactions on Information Forensics and Security, vol. 5, pp. 649- 657, 2010.