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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/52802

    Title: Geometric Invariant Semi-fragile Image Watermarking Using Real Symmetric Matrix
    Authors: 謝景棠;Hsieh, Ching-tang;吳業寬;Wu, Yeh-kuang;洪國銘;Hung, Kuo-ming
    Contributors: 淡江大學電機工程學系
    Keywords: Semi-fragile Watermark;Real Symmetric Matrix;Eigenvlaue;Geometric Invariance;Zernike Transform
    Date: 2007-09-01
    Issue Date: 2010-12-01 10:33:05 (UTC+8)
    Publisher: 臺北縣:淡江大學
    Abstract: In order to improve the detection of malicious tampering of images, it is necessary to decrease the fragility of hidden watermarks, even for digital images which have been distorted incidentally. However, watermarks are sensitive to geometric distortions. In this paper, we propose a new invariant semi-fragile digital watermarking technique based on eigenvalues and eigenvectors of a real symmetric matrix generated by the four pixel-pair. And the multi-rings Zernike transform (MRZT) is proposed to achieve geometric invariance. A signature bit for detecting malicious tampering of an image is generated using the dominant eigenvector. The MRZT method is against the geometric distortions even when the image is under malicious attacks. The experimental results show that this algorithm can resist high quality JPEG compression, and improve the detection performance of various malicious tampering.
    Relation: 淡江理工學刊=Tamkang journal of science and engineering 10(3),頁211-220
    DOI: 10.6180/jase.2007.10.3.04
    Appears in Collections:[Graduate Institute & Department of Electrical Engineering] Journal Article

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