Synchronized detection of the block-based watermark with invisible grid embedding

P. C. Su, C. C.J. Kuo

研究成果: 雜誌貢獻會議論文同行評審

19 引文 斯高帕斯(Scopus)


The loss of synchronization caused by geometrical modifications of an image, such as cropping, rotation and scaling, increases the difficulty of watermark detection, especially for block-based watermarking schemes. In this research, we consider an algorithm to embed an invisible grid structure into watermarked images to overcome this problem. A fixed-size two-dimensional pseudo-random pattern is repeatedly embedded along horizontal and vertical directions of an image after the watermark is embedded in the image. In watermark detection, the affine matrix as well as horizontal/vertical shifts associated with certain geometrical attacks are determined by calculating the auto-correlation of the extracted grid structure and the cross-correlation between the folded grid and the embedded pattern. Synchronization is then recovered, and the watermark can be more easily detected. The applicability and advantages of the proposed algorithm are demonstrated by experimental results.

頁(從 - 到)406-417
期刊Proceedings of SPIE - The International Society for Optical Engineering
出版狀態已出版 - 2001
事件Security and Watermarking of Multimedia Contents III - San Jose, CA, United States
持續時間: 22 1月 200125 1月 2001


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