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http://dx.doi.org/10.13089/JKIISC.2005.15.2.113

Multi-Watermarking for Image Authentication Based on DWT Coefficients  

Lee Hye-Ran (Pukyong National University)
Rhee Kyung-Hyune (Pukyong National University)
Publication Information
Journal of the Korea Institute of Information Security & Cryptology / v.15, no.2, 2005 , pp. 113-122 More about this Journal
Abstract
In this paper, we propose a multi-watermarking algorithm to satisfy two purposes: fragility against malicious attacks and robustness against non-malicious attacks. The algorithm can be used for image authentication using coefficients of Discrete Wavelet Transform(DWT). In the proposed method, watermarks are generated by combining binary image with some features extracted from the subband LL3, and then they are embedded into both the spatial and frequency domain. That is, on the spatial domain they are embedded into the Least Significant Bit(LSB) of all pixels of image blocks, and on the frequency domain the coefficients of the subband LH2 and HL2 are adjusted according to the watermarks. Thus the algorithm not only resists malicious attack but also permits non-malicious attacks such as blurring, sharpening, and JPEG compression.
Keywords
Semi-fragile Watermarking; dual-watermark; DWT; Authentication;
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