CN101777134B - Presswork encryption security printing technology based on multi-system quadrature amplitude modulation - Google Patents
Presswork encryption security printing technology based on multi-system quadrature amplitude modulation Download PDFInfo
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- CN101777134B CN101777134B CN2010101153063A CN201010115306A CN101777134B CN 101777134 B CN101777134 B CN 101777134B CN 2010101153063 A CN2010101153063 A CN 2010101153063A CN 201010115306 A CN201010115306 A CN 201010115306A CN 101777134 B CN101777134 B CN 101777134B
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Abstract
The invention discloses a presswork encryption security printing technology based on multi-system quadrature amplitude modulation. By adopting the security printing technology, a paseudorandom modulating signal can be generated from anti-counterfeiting information through spread spectrum, encryption and channel coding, the anti-counterfeiting information can be embedded into a whole page through a multi-system quadrature amplitude modulation (QAM) mode, and the anti-counterfeiting information can be identified from any fragment in presswork identification. The invention has very strong smash-resistance, can effectively resist piracy behaviour based on cameras, scanners, electronic documents and the like, and can be widely applied to the field of presswork anti-counterfeit.
Description
Affiliated technical field:
The present invention relates to a kind ofly based on digital printed goods anti-counterfeiting printing technology, particularly a kind of in based on the amplitude-modulated printed matter encryption counterfeit printing technology of M-ary orthogonal, this anti-counterfeiting printing technology can be used for the false proof of various printed matters.
Background technology:
Existing comparatively common method for anti-counterfeit has following several kinds: first kind is laser anti-false sign; The anti-fake label of the symbol or the special identification icon of product being printed into product with the recessive printing ink daylight fluorescence ink of laser printing technology; And same series products uses with a kind of labeling, and because of anti-fake label is easier to forge, and the anti-fake label of forging is used on the fake products; Cause the true and false of product to obscure, therefore be difficult to effectively false proof.Second kind is the cipher counterfeit-proof labeling, and the method that it adopted is that every product is compiled one group of number, and the coding of every product is all inequality; This number is printed on the labeling and hides, this number is deposited in can supply in the Computer Database that the consumer inquires about, when the consumer buys product simultaneously; Number on the sign is compared identification through the digital entering computer database that phone or networking computing machine will identify, identical being very, difference is vacation; Method is simple, and identification is difficult for forging easily; But in actual the use, because of coded data is that labeling is printed in the unified back that generates of computing machine.The true and false coded data of representative products possibly faked by illegal copies, and simultaneously, the coding on the product of the also recyclable not inquiry of encoding is made mark and is attached on the false pain article, and antifalse effect is difficult to guarantee.The third is a texture anti-fake; Textural characteristics with on its labeling is false proof; Though difficult the forgery, because the serial number that a bidding pastes, and be plain code; Every piece of mark can be inquired about repeatedly, has or not phenomenon to plagiarize the back to forge in batches by this characteristic in the necessary textural characteristics grid that the fake producer can be through warehouseman or shop-assistant be reflected during with sequence number on the labeling and inquiry.In sum, all there is certain shortcoming in existing method for anti-counterfeit, thereby can not be from prevent fake products at all.
Summary of the invention:
In order to overcome the shortcoming that existing various printed matter anti-counterfeiting printing technology exists; The deficiency that the present invention is directed to existing printed matter anti-counterfeiting printing technology existence is improved prior art; Proposed a kind of based on the amplitude-modulated printed matter encryption counterfeit printing technology of M-ary orthogonal; This anti-counterfeiting printing technology can be embedded in anti-counterfeiting information in the full page; Can when printed matter is discerned, in any fragment, discern anti-counterfeiting information, therefore have very strong anti-fragility, can fundamentally stop to adopt bootlegging behaviors such as photograph, scanning.
The technical solution adopted for the present invention to solve the technical problems is: amplitude modulation site and frequency-modulation halftone dot in the flexographic printing mixing screening are separately handled; Adopt M-ary orthogonal Modulation and Amplitude Modulation (QAM) mode; Clocklike change the locus of mixing frequency-modulation halftone dot in the screening; Make the frequency-modulation halftone dot that mixes random distribution in the screening,, make it carry anti-counterfeiting information through the well-regulated redistribution of M-ary orthogonal Modulation and Amplitude Modulation (QAM); And this anti-counterfeiting information is embedded in the full page site, can more effectively resist based on bootlegging behaviors such as camera, scanner, electronic documents.Embed extractible anti-counterfeiting information through non-in printed matter obviously, can valid certificates be provided, have stronger anti-forgery ability simultaneously, and do not increase extra false proof cost for genuine piece.
For solving above-mentioned technical matters, at first anti-counterfeiting information is carried out spread spectrum, encryption, generate pseudo random sequence code (PN).Anti-counterfeiting information can be image information, Word message, trademark information etc.Pseudo random sequence code (PN) generates the pseudorandom modulation signal with EDC error detection and correction function through chnnel coding.Chnnel coding can adopt various ways such as loop coding convolutional encoding or Turbo coding.Original continuous is changed the line map image signal through rasterizing processing (RIP) and mixing screening output shadow tone mixing Screening Image signal, comprising amplitude modulation site and FM screened image signal.Utilize the pseudorandom modulation signal that generates to adopt M-ary orthogonal Modulation and Amplitude Modulation (QAM) mode, modulation mixes the locus of frequency-modulation halftone dot in the Screening Image signal, carries anti-counterfeiting information through the locus of frequency-modulation halftone dot, realizes anti-counterfeit printing.
When extracting anti-counterfeiting information, at first gather the halftone dot image signal, through fuzzy diagnosis, extract the edge signal of site to halftone dot space position, differentiate frequency-modulation halftone dot and amplitude modulation site.The spatial positional information of demodulation frequency-modulation halftone dot, output pseudorandom modulation signal.Pseudorandom modulation signal to demodulation output carries out channel-decoding, despreading and deciphering respectively, recovers anti-false signal and exports anti-counterfeiting information.
Description of drawings
Below in conjunction with accompanying drawing the present invention is further specified.
Add anti-counterfeiting information preceding amplitude modulation site and frequency-modulation halftone dot distribution plan in Fig. 1 mixing screening.
Amplitude modulation site and frequency-modulation halftone dot distribution plan in Fig. 2 mixing screening behind the adding anti-counterfeiting information.
Fig. 3 loads the anti-counterfeiting information process flow diagram.
Fig. 4 extracts the anti-counterfeiting information process flow diagram.
Embodiment
In loading anti-counterfeiting information process flow diagram 3, original anti-counterfeiting information (image, literal, trade mark) generates pseudo random sequence code (PN) through spread spectrum, encryption.Pseudo random sequence code (PN) generates the pseudorandom modulation signal with EDC error detection and correction function through chnnel coding.Chnnel coding can adopt various ways such as loop coding, convolutional encoding or Turbo coding.Original continuous is changed the line map image signal through rasterizing processing (RIP) and mixing screening output shadow tone mixing Screening Image signal, and comprising amplitude modulation site and FM screened image signal, but the distribution of frequency-modulation halftone dot is irregular, and is as shown in Figure 1.Utilize the pseudorandom modulation signal that generates to adopt M-ary orthogonal Modulation and Amplitude Modulation (QAM) mode; Modulation mixes the locus of frequency-modulation halftone dot in the Screening Image signal, generates the mixing Screening Image signal that embeds anti-counterfeiting information, and is as shown in Figure 2; Make the frequency-modulation halftone dot that mixes the random distribution of screening among Fig. 1; Through M-ary orthogonal Modulation and Amplitude Modulation (QAM), press the well-regulated redistribution of distribution mode among Fig. 2, make it carry anti-counterfeiting information; And this anti-counterfeiting information is embedded in the full page site, realize anti-counterfeit printing.
In extracting anti-counterfeiting information process flow diagram 3, at first gather the halftone dot image signal, through fuzzy diagnosis, extract the edge signal of site to halftone dot space position, differentiate frequency-modulation halftone dot and amplitude modulation site.Frequency-modulation halftone dot is carried out M-ary orthogonal amplitude demodulation system, the spatial positional information of demodulation frequency-modulation halftone dot, output pseudorandom modulation signal.Pseudorandom modulation signal to demodulation output carries out channel-decoding, despreading and deciphering respectively, recovers anti-false signal and exports anti-counterfeiting information.
Claims (3)
1. one kind generates the pseudorandom modulation signal with anti-counterfeiting information through spread spectrum, encryption or chnnel coding; And through M-ary orthogonal Modulation and Amplitude Modulation (QAM) mode with anti-counterfeiting information be embedded in the full page based on the amplitude-modulated printed matter enciphering anti-fake printing method of M-ary orthogonal; It is characterized in that: anti-counterfeiting information is generated pseudo random sequence code through spread spectrum, encryption; Again the pseudo random sequence code that generates is generated the pseudorandom modulation signal through chnnel coding; Original continuous is changed the line map image signal through rasterizing processing (RIP) and mixing screening output shadow tone mixing Screening Image signal, utilize pseudorandom modulation signal employing M-ary orthogonal Modulation and Amplitude Modulation (QAM) mode of generation, the locus of frequency-modulation halftone dot in the modulation mixing Screening Image signal; Make the frequency-modulation halftone dot that mixes random distribution in the Screening Image signal; Through the well-regulated redistribution of M-ary orthogonal Modulation and Amplitude Modulation (QAM), thereby be created on the mixing Screening Image signal that embeds anti-counterfeiting information in the full page site, realize anti-counterfeit printing.
2. according to claim 1 based on the amplitude-modulated printed matter enciphering anti-fake printing method of M-ary orthogonal, it is characterized in that: chnnel coding can adopt loop coding, convolutional encoding or Turbo coding.
3. according to claim 1 based on the amplitude-modulated printed matter enciphering anti-fake printing method of M-ary orthogonal, it is characterized in that: anti-counterfeiting information can be image information, Word message or trademark information.
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Publication number | Priority date | Publication date | Assignee | Title |
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CN100349182C (en) * | 2006-04-12 | 2007-11-14 | 上海理工大学 | Fake proof method for printing optical holographic watermark certificate |
CN100469097C (en) * | 2007-03-06 | 2009-03-11 | 北京大学 | Method for abstracting graph and text infromation utilizing half-hue image networking hiding |
CN100559396C (en) * | 2007-06-25 | 2009-11-11 | 中山大学 | But the multiple bit digital watermark method of a kind of anti printing and scanning and geometric transformation |
CN101699845B (en) * | 2009-10-20 | 2011-12-07 | 北京印刷学院 | Encryption counterfeit printing technology of frequency modulated halftone dot space position for pseudo random signal modulation printed matter |
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