基於鄰近區塊之竄改偵錯及影像復原認證方法

隨著數位時代的來臨，電子數位影像已經廣泛且普遍被大眾所使用和傳遞。然而、影像內容的真實性、可信度等許多問題也隨之而來。尤其在醫學、法律、等數位文件的應用上，確保影像的真實性便顯得格外重要。有鑑為此，我們提出了一套可以指出且復原錯誤區塊的影像認證系統。在以下所提出的論文中，影像內容的一致性和相似性被用來建造剩餘區塊，而剩餘區塊經過了離散餘弦轉換後，以編碼藏入對映區塊。由於剩餘區塊的能量很小，所以易於藏匿也可保有好的視覺影像。根據實驗結果，我們的系統不但可以指出影像被竄改的區塊，也可以做某種程度的復原，而藏匿過後的視覺品質達到一定水準，復原能力和偵錯精準度也有不錯的表現。

關鍵字

影像認證；影像復原；剩餘區塊

並列摘要

The image authentication with watermark and localization has been widely studied for many years. However, there are few of them providing the recovery in tampered region. In this paper, we proposed an authentication system not only providing localization as well as tampered region recovery. First, we construct a reference block from adjacent block. Then a residual block is provided by subtracting reference from original block. In our assumption, the energy of it is very low and convenient for us to embed. After encoded and embedded, a system with localization and recovery is constructed. From the simulations and experiments, we find that our proposed method gives a good vision quality. The localization of the tampered area is also successfully marked out and recovered with acceptable fidelity. Furthermore, the robustness of JPEG compression is also provided.

並列關鍵字

image authentication ； image recovery ； residual block

參考文獻

[1] Xiang Zhou, Xiauhui Duan and Dauxian Wang, “A Semi-Fragile Watermark Scheme for Image Authentication ,” Proc. IEEE Int. Conf. on Multimedia Modelling, pp. 374-377, Jan. 2004.

[2] Huajian Liu and Maartin Steinebach, “Digital Watermarking for Image Authentication with Localizaton.” Image Processing, 2006 IEEE International Conference, pp. 1973-1976, Oct. 2006

[4] Abdelkader H, Ouda, Mahmoud R, El-Sakka, “Localization and security enhancement of block-based image authentication,” Image Processing, 2005. ICIP 2005. IEEE International Conference, pp. I- 673-6, Sept. 2005

[5] Phen-Lan Lin, Po-Whei Huang and An-Wei Peng, “A fragile watermarking scheme for image authentication with localization and recovery,”Multimedia Software Engineering, 2004. Proceedings. IEEE Sixth International Symposium, pp. 146- 153, Dec. 2004

[7] Yuan-Liang Tang and Ching-Ting Chen, “Image Authentication Using Relation Measures of Wavelet Coefficients,” Proceedings of the 2004 IEEE international Conference,

國際替代計量

基於鄰近區塊之竄改偵錯及影像復原認證方法

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