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Copyright Protection by Watermarking for Color Images against Print-and-Scan Operations Using Coding and Synchronization of Peak Locations in Discrete Fourier Transform Domain

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題名: Copyright Protection by Watermarking for Color Images against Print-and-Scan Operations Using Coding and Synchronization of Peak Locations in Discrete Fourier Transform Domain

作者: Y. C. Chiu;W. H. Tsai

貢獻者: Department of Information Communication

關鍵詞: digital watermarking;color image;copyright protection;print-and-scan operations;discrete Fourier transform;reproduced image

日期: 2006-05

上傳時間: 2009-11-25T02:31:16Z 出版者: Asia University

摘要: A watermarking method for copyright protection of color images against print-and- scan operations is proposed. A watermark is embedded in an input image as coefficient-value peaks that are circularly and symmetrically distributed in a middle band of the discrete Fourier transform (DFT) domain of the input image. By detecting the robust peaks in the DFT domain of a reproduced image obtained by scanning a printed version of a watermarked image, we can extract the embedded watermark to verify the copyright of the reproduced image. Experimental results are given to prove the feasibility of the proposed method.

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