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

A Study of Digital Watermarking Algorithm on Halftone Images to Resist Hard-copy Attack

Author ZhangYu
Tutor WangQuan
School Xi'an University of Electronic Science and Technology
Course Computer System Architecture
Keywords Digital watermarking Halftone Convex optimization Against a hard copy attack
CLC TP309.7
Type Master's thesis
Year 2010
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The demand for paper publication copyright authentication and protection of halftone digital watermarking algorithm and its resistance to the attack of the hard copy in the actual application process technology , digital watermarking algorithm effective against a hard copy attack . First halftone watermarking algorithm status quo analysis, pointed out the advantages and disadvantages of the existing algorithms , a halftone process embedded watermark algorithm based on convex optimization theory , experimental results show that the algorithm spatial and frequency domain attacks have a good robustness . Designed on the basis of the algorithm , a study was carried out on the model of typical hard copy equipment - printers and scanners , and using the PCL printer autonomous control work method , avoid the attack of the of printer internal processing of the image ; image correction method , effectively reducing attack of the scanner image spatial domain . Actual print scanning environment test , the design of the prototype system to achieve a certain degree of resistance to the attack of the hard copy device , able to extract the watermark information can be identified .

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