臺灣博碩士論文加值系統

在本文中我們提出一套不僅具有良好影像品質且經影像攻擊後仍具有高強韌性的數位浮水印技術，另外在萃取端並無對原始影像之需求。這套方法有三個重要的特性來提升整體效果並可同時使用在小波轉換域及數位餘弦轉換域中。
第一個特點為依據數位浮水印與原始影像特性產生一組私密鑰匙，在萃取端中利用轉換後係數與私密鑰匙將數位浮水印完整的萃取出來，因而並無傳統做法中對原始影像之需求。
第二個特點為使用子區塊重組以及三態互斥或(TXOR)操作來過濾不適合嵌入浮水印的子區塊，並將數位浮水印嵌入較不容易改變極性之子區塊以確保數位浮水印的強韌性。
第三個特點為係數禁區淨空，依據子區塊極性及人眼視覺特性兩極化地調整係數值大小，確保影像品質及降低極性變化機率以增加數位浮水印之強韌性。
整合以上三個特點及經程式驗證後可證明我們所提的此套數位浮水印技術在經影像壓縮，如JPEG、SPIHT、JPEG2000，以及裁切後所萃取出的數位浮水印具有極高的強韌性。

In this thesis, we propose a novel watermarking system that is highly robust against attacks without perceptible image degradation. In addition, the original image is not needed in watermark extraction. It operates either in the DWT domain or the DCT domain. This system integrates three important ideas to provide extellent watermarking performance.
The first idea is to use a secret key that is generated based on the watermark logo and the host image. Based on the polarity of the transform coefficients and the key, the original watermark can accurately be extracted.
The second idea is to use subblock composition to filter out frequency transform blocks that are not suitable for watermark embedding. A Tri-state Exclusive-Or (TXOR) operator is then applied in qualified subblock to embed the watermark. This technique further improves the robustness.
The third idea is the deadzone shifting with human visual system. For watermark embedded transform blocks, if the coefficients are near the threshold, they will be shifted toward two ends so that the embedded watermark is not noticeable but more robust.
With the integration of the above three state-of-art techniques, the resulting watermarking system has excellent performance. Simulation results confirm that the proposed system is extremely robust against cropping, JPEG, JPEG2000, and SPIHT compression.

摘要I
AbstractII
目錄III
圖目V
表目IX
第一章 緒論1
1.1前言1
1.2研究動機1
1.3論文架構3
第二章 目前數位浮水印發展現況與簡介4
2.1數位浮水印的主要功能需求4
2.2數位影像浮水印的分類5
2.3空間域中及頻域中的數位浮水印技術7
2.3.1 空間域中的數位浮水印嵌入技術………………….7
2.3.2 離散餘弦轉換8
2.3.3在離散餘弦轉換中的數位浮水印資訊...………….10
2.3.4小波轉換…………………………………………....13
2.3.5 小波轉換的數位浮水印資訊……..………...……..15
第三章 發展在小波域中的數位浮水印技術……………………19
3.1 數位浮水印嵌入架構…………………………………..... 21
3.2 數位浮水印萃取架構……………………………….…… 29
第四章 發展在離散餘弦轉換中的數位浮水印技術……………30
4.1 數位浮水印嵌入架構……………………………………..30
4.2 數位浮水印萃取架構……………………………………..37
第五章 實驗結果與數據分析…………………………………….39
5.1小波域中的數位浮水印技術之實驗結…………………. 39
5.1.1實驗結果…………………………………………….44
5.1.2討論………………………………………………….61
5.2散餘弦轉換中的數位浮水印技術之實驗結果…………..63
5.1.1實驗結果…………………………………………….67
5.1.2討論………………………………………………….78
第六章 結論與未來展望………………………………………….79
參考文獻.............80

[1] S. G. Miaou, and C. Z. Chen, "A Robust Image Watermarking Technique Based on Wavelet Transform and Human Visual Systems," (Invited Paper) Submitted to J. of Computers (Nov. 2000).
[2] C. F. Wu, W. S. Hsieh, " Digital watermarking using zerotree of DCT ,"Consumer Electronics, IEEE Transactions on Volume: 46 1 , Feb. 2000 , Page(s): 87 -94
[3] I. Cox, J. Kilian, F. T. Leighton, and T. Shamoon, "Secure spread spectrum
watermarking for multimedia, " IEEE Trans. Image Processing, vol. 6 pp.
1673-1687, Dec. 1997.
[4] J. Lee and C. S. Won, "Authentication and correction of digital watermarking images, "Electronics Letters, Vol. 35, No. 11, p. 886-887, 27th May. 1999.
[5] J. Huang, Y. Q. Shi, "Adaptive image watermarking scheme based on visual masking" Electronics Letters Volume: 34 8 , 16 April 1998 , Page(s): 748 -750
[6] C. T. Hsu, J. L. Wu, "Hidden digital watermarks in images" Image Processing, IEEE Transactions on Volume: 8 1 , Jan. 1999 , Page(s): 58 -68
[7] S. G. Miaou,and C. M. Chen, "A Key-Box Image Watermarking Technique for Copyright Prptection," (Invited Paper) Submitted to IEICE Trans. Fundamentals Communications Electronics Information and Systems (Dec. 2000).
[8] M. Antonini, M. Barlaud, P. Mathieu, and I. Daubechies, "Image Coding Using
Wavelet Transform," IEEE Trans. Image Processing, vol. 1, no. 2, Apr. 1992.
[9] C. S. Burrus﹐ R. A. Gopinath, and H. Guo, Introduction to wavelets and wavelet
Transforms - A primer, New Jersey, Prentice-Hall﹐1998
[10] G. Strang and T. Nguyen, Wavelets and Filter Banks, Wellesley-Cambridge
Press,1996
[11] Z. H. Wei, P. Qin, Y.Q. Fu, "Perceptual digital watermark of images using wavelet transform," Consumer Electronics, IEEE Transactions on
Volume: 44 4 , Nov. 1998 , Page(s): 1267 -1272
[12] M. J. Tsai; K. Y. Yu; Y.Z. Chen , "Joint wavelet and spatial transform for digital watermark," ICIP2000 proceedings
[13] G. Voyatzis, I. Pitas, "Appaliciations of toral automorphisms in image watermarking,"Image Processing, 1996. Proceedings., International
Conference on Volume.1 , 1996 , Page(s): 237 -240 vol.2