CN103496263B - A kind of printing net-point code generating method and apply its image printing technique - Google Patents
A kind of printing net-point code generating method and apply its image printing technique Download PDFInfo
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Abstract
The invention discloses a kind of printing net-point code generating method and apply its image printing technique, belong to print field.A kind of printing net-point code generating method, generate site by am screening and fm screening, am screening and fm screening are all generate site in units of laser spots.Apply the image printing technique of this kind of printing net-point code generating method, when former figure is the pattern of am screening, the required information imbedded is generated frequency-modulation halftone dot by above-mentioned a kind of printing net-point code generating method, and the information of carrying out encoding imbedding needed for imbedding is in the former figure of datumization; When former figure is the pattern of fm screening, the required information imbedded is generated amplitude by above-mentioned a kind of printing net-point code generating method, the information of carrying out encoding imbedding needed for imbedding is in the former figure of datumization.Printing net-point code generating method and apply its an image printing technique, do not need special printing space, imbed and contain much information, cataloged procedure is simple, realizes technique simple.
Description
Technical field
The present invention relates to print field, particularly relate to a kind of printing net-point code generating method and apply its image printing technique.
Background technology
Along with the development of science and technology, the requirement of people to antiforge is also more and more higher.
Within 1932, propose the motion of bar code by Ha Fu university of the U.S., and be widely used so far.In order to the demand of satisfied record more information, within 1989, develop Code49 by American I ntermec company, from then on two-dimensional bar code is born, and is widely used.But itself there is a lot of shortcoming, such as: two-dimensional bar code takes up room, can not merge mutually with print content, need special space printing; Be easy to be replicated, can not as the means of Information hiding; The information content imbedded is few, can not meet the requirement of people; Cause printed matter appearance unsightly.
Since 2000, Digital Watermarking Theory is very prevailing in the whole world.But because do not consider that printing screen is theoretical, the problem that the information imbedded in RGB color notation conversion space to CMYK color space is destroyed can not be solved, therefore apply limited.
Since 2000, people hanker after the application of RFID radio frequency chip, but due to its high cost, very difficult promotes on a large scale.
2003, Information Technology Co., Ltd of Tianjin Apollo proposed the method for half-tone screen code.The method can well solve Quick Response Code Problems existing, but it realizes the method that information imbeds realize complex process by changing the position, size, shape etc. of site, special site generation equipment is needed to carry out the information such as shape, size, position of network point, cataloged procedure is complicated, and cost is also higher.
Summary of the invention
For above-mentioned problem, the invention provides a kind of printing net-point code generating method and apply its image printing technique, do not need special printing space, imbed and contain much information, cataloged procedure is simple, realizes technique simple.
The technical solution used in the present invention is: a kind of printing net-point code generating method, and generate site by am screening and fm screening, the site generated represents " 0 " and " 1 " respectively, describes module encode with the information of encoding to printing net-point; Am screening and fm screening are all generate site in units of laser spots;
Apply the image printing technique of described printing net-point code generating method, its processing step comprises:
A. the required information imbedded is encoded, datumization is carried out to former figure simultaneously;
B. when former figure is the pattern of am screening, the required information imbedded is generated frequency-modulation halftone dot by above-mentioned a kind of printing net-point code generating method, the information of carrying out encoding imbedding needed for imbedding is in the former figure of datumization; When former figure is the pattern of fm screening, the required information imbedded is generated amplitude by above-mentioned a kind of printing net-point code generating method, the information of carrying out encoding imbedding needed for imbedding is in the former figure of datumization;
C. finally export the datumization image after information of imbedding, carry out image printing.
In technique scheme, the coding form of printing net-point coding is one-dimensional coding form or two-dimensional encoded form.
In technique scheme, am screening: the gray value of input image pixels is judged whether compared with the screening threshold value in the pattern memory of site produce ink dot, the site formed is expanded to surrounding by grid element center, until be covered with whole grid, thus forms am screening.
In technique scheme, fm screening: the gray value of input image pixels is input as random number series maker, generate a pseudo-random number sequence identical with gray value, then the pseudo-random number sequence of generation is judged whether compared with the screening threshold value in the pattern memory of site to generate ink dot, stochastic generation site, thus form fm screening.
In technique scheme, the pseudo random number column-generation method of fm screening is for taking advantage of congruence pseudo random number column-generation method, adding congruence pseudo random number column-generation method or add and take advantage of congruence pseudo random number column-generation method; These three kinds of pseudo-random number sequences have good stability.
In technique scheme, the recurrence formula taking advantage of congruence pseudo random number column-generation method is x
n=ax
n-1(modm); Adding the recurrence formula taking advantage of congruence pseudo random number column-generation method is x
n=ax
n-1+ C(modm); The recurrence formula adding congruence pseudo random number column-generation method is x
n=x
n-1+ C(modm).
In technique scheme, the coding embedded former figure of printing net-point is realized by the alternative of image bit map, image overall gray level difference mode or shading mode.
In technique scheme, the mode of printing applying the image printing of this kind of printing net-point code generating method directly can mark for laser printing, inkjet printing, laser, stylus printing, hot transfer printing, thermal printing, offset printing, letterpress or intaglio printing.
The invention has the beneficial effects as follows: a kind of printing net-point code generating method of above-mentioned structure and apply its image printing technique, be combined with existing Quick Response Code, allow Quick Response Code merge with former figure phase, thus realize invisible two-dimensional codes; Represent respectively " 0 " and " 1 " with two kinds of sites that different site generating modes generates, carry out alternative original Quick Response Code white space representative " 0 ", the coded system of black region representative " 1 ", thus realize stealthy Quick Response Code; And do not need special printing space, imbed and contain much information, cataloged procedure is simple, realizes technique simple.
Accompanying drawing explanation
Fig. 1 is amplitude schematic diagram of the present invention;
Fig. 2 is frequency-modulation halftone dot schematic diagram of the present invention;
Fig. 3 is that coding schematic diagram is carried out in the region constant for dot area percentage of the present invention;
Fig. 4 is that coding schematic diagram is carried out in the region changed for dot area percentage of the present invention;
Fig. 5 is the image printing process chart of application of the present invention this kind of printing net-point code generating method;
Fig. 6 is that frequency-modulation halftone dot of the present invention and amplitude generate example schematic;
In figure, the 1, first site; 2, the second site; 3, the 3rd site; 4, the 4th site; 5, the 5th site; 6, the 6th site; 7, the 7th site; 8, the 8th site; 9, the 9th site; 10, amplitude; 11, frequency-modulation halftone dot; 12, site pattern memory.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
Fig. 1 to Fig. 6 show schematically show according to a kind of printing net-point code generating method of one embodiment of the present invention and the image printing technique applying it.
This kind of printing net-point code generating method, generate site by am screening and fm screening, the site generated represents " 0 " and " 1 " respectively, describes module encode with the information of encoding to printing net-point; Am screening and fm screening are all generate site in units of laser spots.
Above-mentioned, the coding form of printing net-point coding is one-dimensional coding form or two-dimensional encoded form, and printing net-point coding exists in pattern with the form of the form of the form of word, pictorial pattern or shading.Information describes module and mainly comprises information dot matrix, location dot matrix and error correction dot matrix.Information dot matrix: for describing the dot matrix of information.Location dot matrix: for the dot matrix of the position and direction of demarcating information dot matrix.Error correction dot matrix: be used for carrying out error correction computing to the coding identified, improves the dot matrix of recognition coding reliability.The image data format printing random site coding is character library form, vector data format, image data format and ink jet numbering machine or digital printer private data format.
Above-mentioned, am screening: judged whether by the gray value of input image pixels to produce ink dot compared with the screening threshold value in site pattern memory 12, the site of formation is expanded to surrounding by grid element center, until be covered with whole grid, thus formation am screening, amplitude 10 is as shown in Figure 1.
Above-mentioned, fm screening: the gray value of input image pixels is input as random number series maker, generate a pseudo-random number sequence identical with gray value, then the pseudo-random number sequence of generation is judged whether compared with the screening threshold value in site pattern memory 12 to generate ink dot, stochastic generation site, thus formation fm screening, frequency-modulation halftone dot 11 is as shown in Figure 2.The pseudo random number column-generation method of fm screening is for taking advantage of congruence pseudo random number column-generation method, adding congruence pseudo random number column-generation method or add and take advantage of congruence pseudo random number column-generation method; These three kinds of pseudo-random number sequences have good stability.
Above-mentioned, frequency-modulation halftone dot 11 and amplitude 10 generate example as shown in Figure 6, and in frequency-modulation halftone dot 11 and amplitude 10, the gray value of the image pixel of input is all 24.
Above-mentioned, the recurrence formula taking advantage of congruence pseudo random number column-generation method is x
n=ax
n-1(modm); Namely next random number is that a upper random number is multiplied by a and obtains m remainder number, therefore becomes multiplicative congruential method.In multiplicative congruential method, how to select x
0, these three parameters of a, m, be that can determine the key of the satisfactory random number series of fast ripe generation, be generally m=2
l, a=8q+3, x
0=2t+1, wherein L, q, t all get positive integer, and require m and x
0coprime, x
0coprime with a; M is actually the cycle of the random number that can produce, and the random number cycle of requirement is less than the random number cycle that can produce, and the random number cycle of generally getting requirement is m/4, and coefficient a generally gets and 2
l/2immediate value, meets a=8q+3 again simultaneously.
Above-mentioned, adding the recurrence formula taking advantage of congruence pseudo random number column-generation method is x
n=ax
n-1+ C(modm); Namely next random number is that a upper random number is multiplied by after a adds c and obtains m remainder number, is therefore called and adds multiplicative congruential method.Wherein parameter request is identical with the parameter request of multiplicative congruential method, ensures that c and m is coprime in addition.
Above-mentioned, the recurrence formula adding congruence pseudo random number column-generation method is x
n=x
n-1+ C(modm); Namely next random number obtains m remainder number after a upper random number adds c, is therefore called additive congruential method.
And, take advantage of congruence pseudo random number column-generation method, add congruence pseudo random number column-generation method or add and take advantage of congruence pseudo random number column-generation method to change; Additive congruential method and multiplicative congruential method can carry out parametrization setting through adding multiplicative congruential method and obtain, and when the parameter c adding multiplicative congruential method is 0, namely become multiplicative congruential method, and when the parameter a adding multiplicative congruential method is 0, are then convertible into additive congruential method.Therefore, when equipping pseudo-random number sequence maker, only built-in adding is needed to take advantage of congruence pseudo-random number sequence maker, and add congruence pseudo-random number sequence and take advantage of congruence pseudo-random number sequence all can by add take advantage of congruential random number column-generation device carry out corresponding parameter initialization arrange obtain, do not need to possess three kinds of random number series makers simultaneously, the cost of scrap build can well be saved.
Apply the image printing technique of this kind of printing net-point code generating method, its processing step comprises:
A. the required information imbedded is encoded, datumization is carried out to former figure simultaneously.
B. when former figure is the pattern of am screening, the required information imbedded is generated frequency-modulation halftone dot 11 by above-mentioned a kind of printing net-point code generating method, represent " 0 " with amplitude 10, represent " 1 " with frequency-modulation halftone dot 11, the information of carrying out encoding imbedding needed for imbedding is in the former figure of datumization, when former figure is the pattern of fm screening, the required information imbedded is generated amplitude 10 by above-mentioned a kind of printing net-point code generating method, site representative " 0 " generated by the meshing method of former figure, with site representative " 1 " that the site generating mode being different from former figure generates, the information of carrying out encoding imbedding needed for imbedding is in the former figure of datumization, as shown in Figure 3, encode in the region identical for dot area percentage: the first site 1 is the site before coding, second site 2, 3rd site 3, 4th site 4 is the site after coding, although the second site 2, 3rd site 3, the dot shape of the 4th site 4 is not identical, but they belong to the pseudo random number column-generation method of same fm screening, therefore they can be used for representing identical information, namely can represent " 0 " with the first site 1, with the second site 2, 3rd site 3, 4th site 4 represents " 1 ", thus the information that realizes is at the coding in this region with imbed, as shown in Figure 4, encode in the region different for dot area percentage: the 5th site 5, 6th site 6 is the site before coding, 7th site 7, 8th site 8, 9th site 9 is the site after coding, although the 7th site 7, 8th site 8, the size and shape of the 9th site 9 is not identical, but their generation method is identical, therefore also can be used for representing identical information, namely can with the 5th site 5, 6th site 6 represents " 0 ", with the 7th site 7, 8th site 8, 9th site 9 represents " 1 ", so just can realize information whole printed matter carry out Anywhere coding embedded.
C. finally export the datumization image after information of imbedding, print.
Above-mentioned, the coding embedded former figure of printing net-point is realized by the alternative of image bit map, image overall gray level difference mode or shading mode.
Above-mentioned, the mode of printing applying the image printing of this kind of printing net-point code generating method directly can mark for laser printing, inkjet printing, laser, stylus printing, hot transfer printing, thermal printing, offset printing, letterpress or intaglio printing; For in the authentication of commodity, printing net-point coding laser directly can be marked on commodity; Carrying out in tax reciept printing, by the shading of coding embedded for printing net-point tax reciept, font or pattern, can print with lithographic press; Carrying out in tobacco bale anti-counterfeit printing, can will represent that the printing net-point coding of anti-counterfeiting information adopts intaglio press printing; Carrying out in antifalsification label printing, can will represent that the printing net-point coding of the variable information of label anti-counterfeit adopts flexible printing machine to print; At high-speed digital printing machine, the method realizing high speed printing printing net-point coding is made the form of character library, be encased in the composing system of code-spraying printer, the composing system of code-spraying printer processes according to the form of word, the printing net-point that all variable informations is digital and digital corresponding with variable information is encoded, generate printed data, printed data is directly installed in high-speed digital printing machine, thus realizes high speed code-spraying printing.
Above embodiment is merely illustrative and not limiting to the invention, therefore all equivalences done according to the method described in patent claim of the present invention change or modify, and are included in patent claim of the present invention.
Claims (8)
1. an image printing technique, is characterized in that, its processing step comprises:
A. the required information imbedded is encoded, datumization is carried out to former figure simultaneously;
B. when former figure is the pattern of am screening, the required information imbedded is generated frequency-modulation halftone dot by printing net-point code generating method, the information of carrying out encoding imbedding needed for imbedding is in the former figure of datumization; When former figure is the pattern of fm screening, the required information imbedded is generated amplitude by printing net-point code generating method, the information of carrying out encoding imbedding needed for imbedding is in the former figure of datumization;
C. finally export the datumization image after information of imbedding, carry out image printing;
Described printing net-point code generating method is: generate site by am screening and fm screening, the site generated represents " 0 " and " 1 " respectively, describes module encode with the information of encoding to printing net-point; Am screening and fm screening are all generate site in units of laser spots.
2. image printing technique according to claim 1, is characterized in that: the coding form of printing net-point coding is one-dimensional coding form or two-dimensional encoded form.
3. image printing technique according to claim 1, it is characterized in that: am screening: the gray value of input image pixels is judged whether compared with the screening threshold value in the pattern memory of site produce ink dot, the site formed is expanded to surrounding by grid element center, until be covered with whole grid, thus form am screening.
4. image printing technique according to claim 1, it is characterized in that: fm screening: the gray value of input image pixels is input as random number series maker, generate a pseudo-random number sequence identical with gray value, then the pseudo-random number sequence of generation is judged whether compared with the screening threshold value in the pattern memory of site to generate ink dot, stochastic generation site, thus form fm screening.
5. image printing technique according to claim 4, is characterized in that: the pseudo random number column-generation method of fm screening is for taking advantage of congruence pseudo random number column-generation method, adding congruence pseudo random number column-generation method or add and take advantage of congruence pseudo random number column-generation method.
6. image printing technique according to claim 5, is characterized in that: the recurrence formula taking advantage of congruence pseudo random number column-generation method is x
n=ax
n-1(modm); Adding the recurrence formula taking advantage of congruence pseudo random number column-generation method is x
n=ax
n-1+ C(modm); The recurrence formula adding congruence pseudo random number column-generation method is x
n=x
n-1+ C(modm).
7. image printing technique according to claim 1, is characterized in that: the coding embedded former figure of printing net-point is realized by the alternative of image bit map, image overall gray level difference mode or shading mode.
8. image printing technique according to claim 1, is characterized in that: the mode of printing of image printing is laser printing, inkjet printing, laser directly mark, stylus printing, hot transfer printing, thermal printing, offset printing, letterpress or intaglio printing.
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| CN115470878B (en) * | 2022-10-08 | 2023-05-02 | 北京微点科学技术有限公司 | Variable anti-counterfeiting super-line anti-counterfeiting method and device based on micro-point code |
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