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Research on Watermark for Engineering Graphics Based on Fractional Fourier Transform

Author: KangZuoZuo
Tutor: ZhangHanLing
School: Hunan University
Course: Computer Science and Technology
Keywords: Digital Watermarking Drawings Fractional Fourier Transform Robustness Security
CLC: TP309.7
Type: Master's thesis
Year: 2009
Downloads: 31
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Abstract


Digital watermarking technology is a branch of information hiding technology , new technology is an effective copyright protection , and in recent years has become a hot research topic in the digital realm . Currently , digital watermarking research focused images, video , text and other data as a graphic drawings , however , condensation the designers of wisdom and sweat of its copyright protection is also very important . In recent years, the graphical data, digital watermarking technology began to be taken seriously . A more in-depth research , the main work is as follows : 1 . Purpose of digital watermarking technology , the basic principle of digital watermarking algorithm based on dual - domain analysis in space and frequency domain , the fractional Fourier transform (FRFT) drawing watermarking algorithm , the main method of application areas are discussed , reviewed the research status at home and abroad . Analysis of the fractional Fourier transform theory and its related properties , and the graphical watermark and image watermark comparative analysis summarizes the characteristics of the two - dimensional graphical watermark algorithm and Research . 2 . Propose a non- blind detection watermarking algorithm based on fractional Fourier transform , copyright protection for a two-dimensional drawing . The algorithm uses the fractional Fourier transform dual- domain expression characteristics of flexibility , watermarking fractional Fourier transform spectrum to the the linear vertex coordinates collection . Shear attack capabilities in order to improve the algorithm , the algorithm will vertex coordinate regional grouping , drawing repeated embedding the same watermark information . Experiments show that the algorithm has good robustness and security . 3 . Taking into account the non- blind detection watermarking algorithm limitations in practical applications , drawing blind watermarking algorithm based on fractional Fourier transform . Extraction of the relative coordinate vectors of the two-dimensional drawing a straight line through the fractional Fourier transform transform coefficients . Combined with fractional Fourier transform of the linear nature , according to the size of the watermark , watermark embedding transform coefficients amplitude ratio which . The method is blind watermarking algorithm , to extract the watermark without the original drawing . The experiments show that the algorithm on the basis of ensuring the transparency of the translation, rotation , scaling, and the combination of attacks has good robustness , but also has good security .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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