CN103496263A - Printing dot code generation method and image printing technology using printing dot code generation method - Google Patents
Printing dot code generation method and image printing technology using printing dot code generation method Download PDFInfo
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- CN103496263A CN103496263A CN201310356677.4A CN201310356677A CN103496263A CN 103496263 A CN103496263 A CN 103496263A CN 201310356677 A CN201310356677 A CN 201310356677A CN 103496263 A CN103496263 A CN 103496263A
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Abstract
The invention discloses a printing dot code generation method and an image printing technology using the printing dot code generation method, and belongs to the field of printing. According to the printing dot code generation method, amplitude modulation screening and frequency modulation screening are used for generating dots, and both the amplitude modulation screening and the frequency modulation screening generate the dots with a laser dot as a unit. According to the image printing technology using the printing dot code generation method, when an original drawing has a pattern for the amplitude modulation screening, information which needs embedding is used for generating frequency modulation dots through the printing dot code generation method and is coded, so that the information which needs embedding is embedded into the digitalized original drawing; when the original drawing has a pattern for the frequency modulation screening, the information which needs embedding is used for generating amplitude modulation dots through the printing dot code generation method and is coded, so that the information which needs embedding is embedded into the digitalized original drawing. According to the printing dot code generation method and the image printing technology using the printing dot code generation method, special printing space is not needed, the amount of embedded information is large, the coding processes are simple, and the technology is easy to implement.
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 scientific and technological development, people are also more and more higher to the requirement of antiforge.
Within 1932, proposed the motion of bar code by U.S. Ha Fu university, and be widely used so far.In order to meet the demand that records more information, within 1989, by American I ntermec company, developed Code49, from then on two-dimensional bar code is born, and is widely used.But itself there are a lot of shortcomings, such as: two-dimensional bar code takes up room, and can not merge mutually with print content, needs special-purpose space printing; Be easy to be replicated, can not be as the means of Information hiding; The information content of imbedding is few, can not meet people's requirement; Do not cause the printed matter appearance attractive in appearance etc.
Since 2000, Digital Watermarking Theory is very prevailing in the whole world.But because consider printing screen theory, can not solve at the RGB color notation conversion space to the destroyed problem of information of imbedding in the CMYK color space, therefore apply limited.
Since 2000, people hanker after the application of RFID radio frequency chip, but, due to its high cost, very difficult arriving on a large scale promoted.
2003, Information Technology Co., Ltd of Tianjin Apollo proposed the method for half-tone screen code.The method can well solve the problem that Quick Response Code exists, but its position by the change site, size, shape etc. realize that the method that information is imbedded realizes complex process, need special-purpose site generation equipment to carry out the information such as shape, size, position of network point, the cataloged procedure complexity, 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-purpose printing space, to imbed and contain much information, cataloged procedure is simple, realizes that technique is simple.
The technical solution used in the present invention is: a kind of printing net-point code generating method, generate site by am screening and fm screening, and the site generated represents respectively " 0 " and " 1 ", records and narrates module with the information to the printing net-point coding and is encoded; Am screening and fm screening are all to take laser point as unit generation site.
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 screening threshold in the gray value of input image pixels and site model memory is judged whether to produce ink dot, the site formed is expanded to surrounding by grid element center, until be covered with whole grid, thus form am screening.
In technique scheme, fm screening: the gray value of input image pixels is input as to the random number series maker, generate a pseudo-random number sequence identical with gray value, then the screening threshold in the pseudo-random number sequence of generation and site model memory is judged whether to generate ink dot, the random site that generates, thus fm screening formed.
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, add congruence pseudo random number column-generation method or adding the congruence pseudo random number column-generation method of taking advantage of; These three kinds of pseudo-random number sequences have good stability.
In technique scheme, taking advantage of the recurrence formula of congruence pseudo random number column-generation method is x
n=ax
n-1(mod m); Add that to take advantage of the recurrence formula of congruence pseudo random number column-generation method be x
n=ax
n-1+ C(mod m); The recurrence formula that adds congruence pseudo random number column-generation method is x
n=x
n-1+ C(mod m).
Apply the image printing technique of this kind of printing net-point code generating method, its processing step comprises:
A. the required information of imbedding is encoded, former figure is carried out to datumization simultaneously;
B. when pattern that former figure is am screening, a kind of printing net-point code generating method that the required information exchange of imbedding is excessively above-mentioned generates frequency-modulation halftone dot, is encoded to imbed the required information of imbedding in the former figure of datumization; When pattern that former figure is fm screening, a kind of printing net-point code generating method that the required information exchange of imbedding is excessively above-mentioned generates amplitude, is encoded to imbed the required information of imbedding in the former figure of datumization;
C. the datumization image after information is imbedded in final output, carries out image printing.
In technique scheme, the coding embedded former figure of printing net-point is that alternative, image overall gray level difference mode or the shading mode by image bit map realizes.
In technique scheme, the mode of printing of applying the image printing of this kind of printing net-point code generating method can be laser printing, inkjet printing, the direct mint-mark of 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, with existing Quick Response Code, be combined, allow Quick Response Code and former figure merge mutually, thereby realize invisible two-dimensional codes; Two kinds of sites that generate with different site generating modes represent respectively " 0 " and " 1 ", substitute 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-purpose printing space, and to imbed and contain much information, cataloged procedure is simple, realizes that technique is simple.
The 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 the zone constant for the dot area percentage of the present invention schematic diagram of being encoded;
Fig. 4 is the zone changed for the dot area percentage of the present invention schematic diagram of being encoded;
Fig. 5 is the image printing process chart of this kind of printing net-point code generating method of application of the present invention;
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 4; 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 model memory.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
Fig. 1 to Fig. 6 has schematically shown according to a kind of printing net-point code generating method of one embodiment of the present invention and has applied its image printing technique.
This kind of printing net-point code generating method, generate site by am screening and fm screening, and the site generated represents respectively " 0 " and " 1 ", records and narrates module with the information to the printing net-point coding and encoded; Am screening and fm screening are all to take laser point as unit generation site.
Above-mentioned, the coding form of printing net-point coding is one-dimensional coding form or two-dimensional encoded form, and the printing net-point coding is that the form with word, the form of pictorial pattern or the form of shading exist in pattern.Information is recorded and narrated module and is mainly comprised information dot matrix, location dot matrix and error correction dot matrix.Information dot matrix: for recording and narrating the dot matrix of information.Location dot matrix: for the position of demarcating the information dot matrix and the dot matrix of direction.Error correction dot matrix: be used for the coding identified is carried out to the error correction computing, improve the dot matrix of recognition coding reliability.The image data format that prints random site coding is character library form, vector data form, image data format and ink jet numbering machine or digital printer private data format.
Above-mentioned, am screening: the screening threshold in the gray value of input image pixels and site model memory 12 is judged whether to produce ink dot, and the site of formation is expanded to surrounding by grid element center, until be covered with whole grid, thereby the formation am screening, amplitude 10 as shown in Figure 1.
Above-mentioned, fm screening: the gray value of input image pixels is input as to the random number series maker, generate a pseudo-random number sequence identical with gray value, then the screening threshold in the pseudo-random number sequence of generation and site model memory 12 is judged whether to generate ink dot, the random site that generates, thereby the formation fm screening, frequency-modulation halftone dot 11 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, add congruence pseudo random number column-generation method or adding the congruence pseudo random number column-generation method of taking advantage of; 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, taking advantage of the recurrence formula of congruence pseudo random number column-generation method is x
n=ax
n-1(mod m); Be that next random number is that a upper random number is multiplied by a m remainder number is obtained, therefore become multiplicative congruential method.In multiplicative congruential method, how to select x
0, these three parameters of a, m, be determine can the satisfactory random number series of fast ripe generation key, 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 that the random number cycle of requirement wants specific energy to produce is little, and the random number cycle of generally getting requirement is m/4, and coefficient a generally gets and 2
l/2immediate value, meet again a=8q+3 simultaneously.
Above-mentioned, add that to take advantage of the recurrence formula of congruence pseudo random number column-generation method be x
n=ax
n-1+ C(mod m); Be that next random number is that a upper random number is multiplied by after a adds c m remainder number is obtained, therefore be called and add multiplicative congruential method.Wherein parameter request is identical with the parameter request of multiplicative congruential method, guarantees that in addition c and m are coprime.
Above-mentioned, the recurrence formula that adds congruence pseudo random number column-generation method is x
n=x
n-1+ C(mod m); Be that next random number is after a upper random number adds c, m remainder number to be obtained, therefore be 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 be changed; Additive congruential method and multiplicative congruential method can carry out the parametrization setting and obtain through adding multiplicative congruential method, when the parameter c that adds multiplicative congruential method is 0, become multiplicative congruential method, and, when the parameter a that adds multiplicative congruential method is 0, are convertible into additive congruential method.Therefore, when equipment pseudo-random number sequence maker, only need built-in adding to take advantage of congruence pseudo-random number sequence maker to get final product, and add the congruence pseudo-random number sequence and take advantage of the congruence pseudo-random number sequence all can to take advantage of congruence random number series maker to carry out corresponding parameter initialization setting to obtain by adding, do not need to possess three kinds of random number series makers simultaneously, can well save the cost of scrap build.
Apply the image printing technique of this kind of printing net-point code generating method, its processing step comprises:
A. the required information of imbedding is encoded, former figure is carried out to datumization simultaneously.
B. when pattern that former figure is am screening, a kind of printing net-point code generating method that the required information exchange of imbedding is excessively above-mentioned generates frequency-modulation halftone dot 11, with amplitude 10 representatives " 0 ", with frequency-modulation halftone dot 11 representatives " 1 ", encoded to imbed the required information of imbedding in the former figure of datumization, when pattern that former figure is fm screening, a kind of printing net-point code generating method that the required information exchange of imbedding is excessively above-mentioned generates amplitude 10, the site representative " 0 " generated by the meshing method of former figure, the site representative " 1 " generated with the site generating mode that is different from former figure, encoded to imbed the required information of imbedding in the former figure of datumization, as shown in Figure 3, encoded in the zone identical for dot area percentage: the first site 1 is the front site of coding, the second site 2, the 3rd site 3, the 4th site 4 is the site after encoding, although the second site 2, the 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, can represent " 0 " with the first site 1, with the second site 2, the 3rd site 3, the 4th site 4 represents " 1 ", thereby the information that realizes is at the coding in this zone and imbed, as shown in Figure 4, encoded in the zones different for dot area percentage: the 5th site 5, the 6th site 6 is the front site of coding, the 7th site 7, the 8th site 8, the 9th site 9 is the site after encoding, although the 7th site 7, the 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 meaning identical information, can be with the 5th site 5, the 6th site 6 represents " 0 ", with the 7th site 7, the 8th site 8, the 9th site 9 represents " 1 ", so just can realize information whole printed matter carry out Anywhere coding embedded.
C. the datumization image after information is imbedded in final output, is printed.
Above-mentioned, the coding embedded former figure of printing net-point is that alternative, image overall gray level difference mode or the shading mode by image bit map realizes.
Above-mentioned, the mode of printing of applying the image printing of this kind of printing net-point code generating method can be laser printing, inkjet printing, the direct mint-mark of laser, stylus printing, hot transfer printing, thermal printing, offset printing, letterpress or intaglio printing; In the authentication for commodity, printing net-point can be encoded with the direct mint-mark of laser to commodity; In carrying out the tax reciept printing, can, by the shading of the coding embedded tax reciept of printing net-point, font or pattern, with lithographic press, print; In carrying out the tobacco bale anti-counterfeit printing, the printing net-point coding that means anti-counterfeiting information can be adopted to the intaglio press printing; In carrying out the antifalsification label printing, can adopt flexible printing machine to be printed the printing net-point coding that means the variable information of label anti-counterfeit; At the high speed digital printer, the method that realizes high speed printing is the form of character library that the printing net-point coding is made, be encased in the composing system of code-spraying printer, the composing system of code-spraying printer is processed 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 directly is installed in the high speed digital printer, thereby realizes the high speed code-spraying printing.
Above embodiment is merely illustrative and not limiting to the invention, and the equivalence of doing according to the described method of patent claim of the present invention therefore all changes or modifies, and is included in patent claim of the present invention.
Claims (9)
1. a printing net-point code generating method, is characterized in that, by am screening and fm screening, generates site, and the site generated represents respectively " 0 " and " 1 ", records and narrates module with the information to the printing net-point coding and encoded; Am screening and fm screening are all to take laser point as unit generation site.
2. a kind of printing net-point code generating method 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. a kind of printing net-point code generating method according to claim 1, it is characterized in that: am screening: the screening threshold in the gray value of input image pixels and site model memory is judged whether to produce ink dot, the site formed is expanded to surrounding by grid element center, until be covered with whole grid, thereby form am screening.
4. a kind of printing net-point code generating method according to claim 1, it is characterized in that: fm screening: the gray value of input image pixels is input as to the random number series maker, generate a pseudo-random number sequence identical with gray value, then the screening threshold in the pseudo-random number sequence of generation and site model memory is judged whether to generate ink dot, the random site that generates, thus fm screening formed.
5. a kind of printing net-point code generating method according to claim 4, it 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, add congruence pseudo random number column-generation method or adding the congruence pseudo random number column-generation method of taking advantage of.
6. a kind of printing net-point code generating method according to claim 5, it is characterized in that: taking advantage of the recurrence formula of congruence pseudo random number column-generation method is x
n=ax
n-1(mod m); Add that to take advantage of the recurrence formula of congruence pseudo random number column-generation method be x
n=ax
n-1+ C(mod m); The recurrence formula that adds congruence pseudo random number column-generation method is x
n=x
n-1+ C(mod m).
7. application rights requires the image printing technique of 1 described a kind of printing net-point code generating method, and its processing step comprises:
A. the required information of imbedding is encoded, former figure is carried out to datumization simultaneously;
B. when pattern that former figure is am screening, a kind of printing net-point code generating method that the required information exchange of imbedding is excessively above-mentioned generates frequency-modulation halftone dot, is encoded to imbed the required information of imbedding in the former figure of datumization; When pattern that former figure is fm screening, a kind of printing net-point code generating method that the required information exchange of imbedding is excessively above-mentioned generates amplitude, is encoded to imbed the required information of imbedding in the former figure of datumization;
C. the datumization image after information is imbedded in final output, carries out image printing.
8. a kind of printing net-point code generating method according to claim 7, it is characterized in that: the coding embedded former figure of printing net-point is that alternative, image overall gray level difference mode or the shading mode by image bit map realizes.
9. a kind of printing net-point code generating method according to claim 7, it is characterized in that: the mode of printing of image printing is laser printing, inkjet printing, the direct mint-mark of laser, stylus printing, hot transfer printing, thermal printing, offset printing, letterpress or intaglio printing.
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| CN115470878A (en) * | 2022-10-08 | 2022-12-13 | 北京微点科学技术有限公司 | Variable anti-counterfeiting over-line anti-counterfeiting method and device based on micro-point code |
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| CN115470878A (en) * | 2022-10-08 | 2022-12-13 | 北京微点科学技术有限公司 | Variable anti-counterfeiting over-line anti-counterfeiting method and device based on micro-point code |
| 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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