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Digital Watermarking Security in the Printing and Scanning Process of Image

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In this paper, a novel security method based on digital watermarking in printing and scanning is studied, and a watermarking algorithm based on discrete wavelet transform is proposed. First all, the principles and color space theory of color image watermarking is analyzed, and color distortion and geometric error caused by printing and scanning process are discussed. According to singular value decomposition and wavelet multi-resolution analysis, the digital watermarks were embedded into color image through embedding watermark into singular value of wavelet coefficients matrix. After embedding, the color image was printed with inkjet printer and scanned after the digital watermarks were embedded, then watermark extraction and Evaluation was performed. Experiment results show that the robustness and invisibility of this algorithm are strong, and that the digital watermarking proposed in this paper would be stand against general printing and scanning process. Compared with other anti-counterfeiting technology in security printing, the method in this paper has the advantages of low cost and simple implementation.

Document Type: Research Article

Publication date: January 1, 2011

More about this publication?
  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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