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Certificate anti-counterfeiting digital watermarking processing method based on mathematical modelling

A mathematical modeling and digital watermarking technology, applied in image data processing, image data processing, instruments, etc., to achieve the effect of improving accuracy and good robustness

Inactive Publication Date: 2011-11-23
BEIHANG UNIV
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  • Certificate anti-counterfeiting digital watermarking processing method based on mathematical modelling
  • Certificate anti-counterfeiting digital watermarking processing method based on mathematical modelling
  • Certificate anti-counterfeiting digital watermarking processing method based on mathematical modelling

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Embodiment Construction

[0049] The overall frame diagram of the anti-counterfeiting digital watermarking method for certificates based on mathematical modeling of the present invention is as follows: figure 1 shown. The overall process includes three parts: mathematical modeling and correction of document image printing and scanning distortion, watermark embedding and watermark detection.

[0050] 1. Mathematical modeling and correction of document image printing and scanning distortion

[0051] 1) The main distortion experienced by the document image printing and scanning process

[0052] (1) Geometric distortion

[0053] During the printing and scanning process of documents, due to mechanical and manual errors, geometric transformation distortions may occur to varying degrees, mainly including rotation, scaling and translation transformation, and sometimes shear transformation.

[0054] figure 2 It is the document image before and after printing and scanning. It can be seen that it is the same...

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Abstract

A certificate anti-counterfeiting digital watermarking processing method based on mathematical modelling comprises mathematical modelling and correction of the print-and-scan distortion of a certificate image, watermark embedment and watermark detection, wherein pixel distortion of the certificate image produced in the print-and-scan process is corrected by establishing a mathematical model; a model curve is fitted through a mass of experimental data; the certificate image after the print and scan is corrected through the obtained model curve; the watermark detection is performed on the corrected image, so that the accuracy rate of the watermark detection can be effectively increased; therefore, a new print-and-scan resilient digital image watermark algorithm based on VQIM and Discrete Fourier Transformation (DFT) is provided in combination with pixel distortion modeling and correction; and the new algorithm is to embed and detect a watermark in the DFT transformation domain of the certificate image, thus obtaining good robustness for the print-and-scan process.

Description

technical field [0001] The invention relates to a multimedia digital watermark embedding and detection method, in particular to a mathematical modeling-based anti-counterfeiting digital watermark processing method. Background technique [0002] Documents are usually official documents that grant or confer qualifications and honors according to the law, such as ID cards, passports, driver's licenses, diplomas, certificates, etc., which are reliable materials to prove or determine the authenticity of people and things. Since documents usually have important use value, they become an important target for crimes. At present, with the increasingly rampant criminal activities of forging and altering documents, the counterfeiting of documents has become the second largest social public hazard after drug trafficking, bringing great security problems to the society. [0003] Anti-counterfeiting methods of traditional ID photos include paper anti-counterfeiting and special ink anti-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 白志勇陈真勇刘骁刘永波熊璋
Owner BEIHANG UNIV
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