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File anti-fake method and its device based on digital water print

A technology for digital watermarking and documents, applied in the field of document anti-counterfeiting technology and its devices, to achieve the effects of increasing printing costs, being convenient to use, and improving security

Inactive Publication Date: 2004-07-14
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a certificate anti-counterfeiting method based on digital watermarking technology and a device for realizing the method, which can resist the geometric distortion of the image and the serious distortion of the pixel value caused by the printing / scanning process, and the calculation amount is relatively small. Small, easy to implement and reliable

Method used

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  • File anti-fake method and its device based on digital water print
  • File anti-fake method and its device based on digital water print
  • File anti-fake method and its device based on digital water print

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Embodiment Construction

[0065] exist figure 1 discloses a production process of a certificate (such as a passport), using a digital camera to take a photo of the holder of the certificate, which is referred to as the original photo 100, an invisible digital watermark 200, and the input watermark embedding module 300 is embedded in From the digital photo of the certificate holder, a watermarked photo 400 is obtained, and then the printing device 500 is used to output to form the certificate 600 .

[0066] exist figure 2 In the certificate identification process shown, the certificate 600 is converted into a digital photo 800 through the image input device 700 (scanner or digital camera), and the watermark extraction operation is performed on the digital photo 800 by using the watermark extraction module 900, and according to the authenticity discrimination module Whether the digital photo contains a pre-designed watermark to judge the authenticity of the certificate.

[0067] exist image 3 , furt...

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Abstract

The present invention discloses file anti-fake method and device based on digital water print. During making certificate and similar file, one pre-designed invisible digital water print is embedded into the file to form anti-fake certificate. When the anti-fake certificate is checked, image scanning and photographing device is used to scan the image in the certificate and extract water print to judge the truth of the certificate. The certificate made through printing and pressing has the picture of the certificate holder and digital water print, which is embedded into the picture and is the random digital sequence produced with the ID number and through enciphering. The method and device can resist the image deformation and degradation caused by printing and scanning, has small computing amount, and is simple, convenient and reliable.

Description

technical field [0001] The invention relates to a file anti-counterfeiting technology and its device, in particular to a technology for anti-counterfeiting certificates using digital watermark technology and a device for implementing the technology. Background technique [0002] The development of information technology and the advancement of high-quality image input and output equipment, especially the popularization of high-precision color inkjet, laser printers and high-precision scanners, have brought a lot of convenience to people's work and life, but also made Forgery and tampering of various identity-related documents such as ID cards, degree certificates, graduation certificates, work permits, passports, and driver's licenses are becoming easier and easier. Cases of using false documents to carry out illegal activities are not uncommon. Relevant data show that in the United States, about 500,000 people are victimized by false documents and documents every year, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06T5/50H04N1/387H04N5/913
Inventor 梁华庆杨义先钮心忻
Owner BEIJING UNIV OF POSTS & TELECOMM
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