Encryption counterfeit printing technology of frequency modulated halftone dot space position for pseudo random signal modulation printed matter

Abstract

The invention discloses an encryption counterfeit printing technology based on the frequency modulated halftone dot space position in a pseudo random signal modulation hybrid screening. The counterfeit printing technology can change the counterfeit information into the pseudo random modulation signal through spread spectrum, encryption and channel coding to generate, embed the counterfeit information in the entire page though the quadrature phase shift keying (QPSK), and identify the counterfeit information in any fragment when identifying the printing matter so that the technology of the invention has strong shatter resistant, can more effectively counter the illegal copying behavior based on cameras, scanners, electronic documents and the like, and can be widely applied in the counterfeit field of the printing matter.

Description

Technical field: [0001] The invention relates to an anti-counterfeiting printing technology based on digital printed products, in particular to an encrypted anti-counterfeiting printing technology in which a pseudo-random signal modulates the spatial position of frequency-modulated dots of printed products. The anti-counterfeiting printing technology can be used for anti-counterfeiting of various printed products. Background technique: [0002] The existing relatively common anti-counterfeiting methods are as follows: The first is laser anti-counterfeiting marks, which use laser recessive ink fluorescent ink printing technology to print product logos or special identification patterns into product anti-counterfeiting labels. And the same type of product uses the same label, because the anti-counterfeiting label is easier to forge, and the fake anti-counterfeiting label is used on the counterfeit product, causing the product to be confused, so it is difficult to effectively pr...

AI Technical Summary

Problems solved by technology

[0002]The existing more common anti-counterfeiting methods are as follows: The first is laser anti-counterfeiting marks, which use laser hidden ink fluorescent ink printing technology to mark the product The anti-counterfeit label of the product is printed with the emblem or a special identification pattern, and the same kind of label is used for the same type of product, because the anti-counterfeit label is easier to forge, and the forged anti-counterfeit label is used on the counterfeit product, causing the product to be damaged. True and false are confused, so it is difficult to effectively prevent counterfeiting

The second is the password anti-counterfeiting label. The method adopted is to compile a set of numbers for each product, and the codes of each product are different. The numbers are printed on the labels and covered, and the numbers are stored Into the computer database that can be inquired by consumers. When consumers purchase products, they input the numbers on the logo into the computer database for comparison and identification through telephone or networked computers. The same is true, and the difference is false. Simple, easy to identify, not easy to forge, but in actual use, because the coded data is uniformly generated by the computer and printed on the label

In summary, the existing anti-counterfeiting methods have certain shortcomings, and thus cannot fundamentally prevent counterfeit products.

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