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A Study on Forgery Prevention Algorithm of Digital Watermarking for Printing Image

Author: ChenHaiSheng
Tutor: LiuZuoï¼›CaoCongJun
School: Xi'an University of Technology
Course: Printing Engineering
Keywords: Digital Watermarking Wavelet Transform Singular Value Decomposition Printing security
CLC: TS853.6
Type: Master's thesis
Year: 2005
Downloads: 287
Quote: 5
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Abstract


This paper proposes a new algorithm of color image digital watermark security , digital watermarking technology is used in the field of security printing , printing anti-counterfeiting technology research provides a new way of thinking . The research results can be applied to the Copyright color printed graphic products , such as documents , securities . Great significance for promoting security science and technology progress , Social Security Printing and national economic growth . Research : ( 1 ) analysis of the printed graphic print scan color distortion , a new color image watermarking security algorithm ; Its main innovation is to use a color space , wavelet transform and singular value decomposition the theoretical advantages of the algorithm design, using CIE1976L ~ * a to * b * to * uniform color space , the watermark processing , and the watermark embedding to the singular values ??of the wavelet coefficient of different frequency bands can reduce the loss of print scanning process of the watermark , improved watermark robustness and security; perturbation Theorem (2) According to the singular values ??, using the color difference method quantitative estimate of the error between the original image and the watermarked image , to adjust the strength of the embedded watermark ; design was evaluated by a color difference method watermark is not visible to ensure the uniqueness of the watermark ; ( 3 ) According to the experimental design of the black box theory through computer programming watermark embedding and extraction , the use of high-resolution printer , scanner experiments to obtain accurate experimental data , the last comprehensive evaluation of the algorithm effectiveness. The subject of the proposed algorithm can resist the general counterfeiters print , scan processing and general image processing results can color prints copyright protection and anti-counterfeiting requirements ; compared with other watermarking algorithm , the watermark robustness and invisibility better ; compared with other security printing techniques , low cost , simple .

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CLC: > Industrial Technology > Light industry,handicrafts > Printing Industry > Special printing > Special printing: process sub- > Holographic printing, security printing
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