CN1336583A - Matrix code printing and identifying method - Google Patents
Matrix code printing and identifying method Download PDFInfo
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- CN1336583A CN1336583A CN01131222.XA CN01131222A CN1336583A CN 1336583 A CN1336583 A CN 1336583A CN 01131222 A CN01131222 A CN 01131222A CN 1336583 A CN1336583 A CN 1336583A
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Abstract
The invention discloses a method to print and recognize new matrix code. The characters of the two dimensions matrix code are as follows. The spaces between each module along X direction or Y direction are the multiple of 1/180 inch. A square gridding matrix with multiple of 1/180 inch is provided as a recognizing mode, with CCD image video camera device being used to recognize this kind of two dimensions matrix code. Whether it is as binary '1' or '0' in the matrix code module is judged by whether the printing color is existed or not in effective area at the center of each square grid of the matrix. The invention can effectively use stylus printer to print the matrix code in lesser area of a ticket for computer to be used in automatic recognition.
Description
The present invention relates to the Computer Automatic Recognition technology, refer in particular to and use stylus printer to print a kind of new matrix code printing and the recognition methods of matrix sign indicating number.
Along with the develop rapidly of modern science and technology, information is more and more important in social life.Therefore, utilize the Computer Automatic Recognition technology to gather and handle the common recognition that needed information has become people quickly and accurately.
In the Computer Automatic Recognition technology, the bar code scan technology is quick, accurately, cost is low, the reliability height, error rate with the information typing is an example: the keyboard logging data, error rate is three per milles, utilize optical character recognition, error rate is about very much one, and employing bar code scan typing mode, the bit error rate only has 1,000,000/, barcode technology is widely used in commercial logistics with its unique technique advantage, taking care of books, Storage of Goods, posts and telecommunications, fields such as industrial processes control have driven the commerce at field depth quarter and the revolution of message area.
Planar bar code technology is that development is and next on the basis of bar code (bar code), and its advantage is: contain much information; Self-contained information; Can carry out Chinese, graphical information record; Can carry out uniqueness to " article " describes; Can carry out graph text information encrypts.The appearance of two-dimension code provides more wide development space for the raising of all trades and professions management work efficient and level.
Two-dimension code divides the matrix sign indicating number and piles up sign indicating number two classes.
The national quality technical supervision detects the national technical standard of quarantine office in Dec, 2000 issue and " quick response matrix code " (being called for short QR sign indicating number) of implementing July calendar year 2001 a kind of international advanced bar code automatic identification technology is provided.The QR sign indicating number of matrix sign indicating number not only have 2 D code information content big, can encryption anti-counterfeiting, characteristics such as strong error correction are arranged, and have that the Chinese character of optimization is used, scanning recognition speed fast (distinguishing the code sign of 30 100 characters p.s.), code sign look sky is than little, 360 ° of advantages such as omnidirectional Recognition.
For example, the automatic identification technology of using in VAT invoice just must possess and contains much information, and recognition speed is fast, and security performance is good, the technical characterstic that error rate is low.The characteristics of comprehensive various Computer Automatic Recognition technology, in conjunction with the characteristics of VAT invoice, selecting to use square matrix code is preferred plan as the automatic identification technology of quick typing invoice ticket body information.
In the false proof management of VAT invoice, use and encrypt the QR matrix code technology, the technical equipment of the quick typing of VAT invoice is provided for China's tax system, ins and outs are double to be controlled, set up quick reactive machanism, make full use of the invoice database of golden tax project, realize the swift electron exchanges data, strive the of that month solution of of that month problem, find rapidly to write out falsely ticket, lack coupon, false invoice, stop up the tax dodging leak, really set up complete tax revenue supervisory system, realize VAT invoice networking management, office automation, false-proof digitalization.
The data type of matrix sign indicating number comprises numerical data, alphabet data, octet data, character data, and it expands explanation can represent default character set data in addition.
The physical arrangement of matrix sign indicating number is made up of the module of two dark-and-light colour size shape unanimity, with the QR sign indicating number (Quick Response Code) of Japan and two kinds of matrix sign indicating numbers of Data Martix Code of the U.S. is example, their physical arrangement all is to form with the square modules of two dark-and-light colour, dark module representative binary " 1 ", light color module representative binary " 0 ", its symbol printing needs " guaranteeing that module size is the integral multiple (being parallel and perpendicular to the both direction of print direction) of printer port of printer lattice dimensions " (referring to the National Standard quick response matrix code " GB/T18284-2000).
The matrix sign indicating number is to adopt ccd image sensor as the symbol acquisition identification equipment, above-mentioned requirements is in order to satisfy the equidistant intervals of the photodiode document image light intensity that is the matrix distribution in the area array CCD, so that calculate the quantity of the two dark-and-light colour module of same size, and be converted into binary data and formulate.
According to the technical standard of matrix sign indicating number, the sub-circular that the two dark-and-light colour module size is inconsistent, module is non-square all is to violate the matrix code sign to print code requirement, and its result will cause the CCD decoding failure.
Promote the use of the matrix sign indicating number in the ticket field that stylus printer is printed and to solve problems such as the quick typing of information that many tickets need solve, false proof management, but, the surface of various tickets can print data area all carried out the intensification design, can be all very little for the printing area of printing the matrix sign indicating number, thereby require the matrix sign indicating number module of printing as far as possible little, so that form as far as possible little matrix code sign.
Under the prerequisite of above-mentioned technical conditions, use stylus printer to print the matrix sign indicating number and just have following difficulty:
1. the out-of-shape of print point, the pin of stylus printer is circular, the module that the pin mark with 2 * 2,3 * 3,4 * 4 is formed is a near round shape basically, can not print square.(if print a square modules, just this module must be strengthened, until its four edges respectively form straight line and on four angles of ignoring by,
0.4mm the pairing one section arc of semicircle of round dot, the matrix code sign that this moment, this square modules was formed has just lost significance of application.)
2. multi-joint copy is printed, and number of pages increases, and print point has diffusivity, and the seal spot size of each connection has the tendency of increase, causes block size out of control.
3. the module size formed of print point can not become multiple to concern with the micro-stepping of printer port of printer, either large or small, and (diameter of print needle is 0.18,0.2-0.3mm; The X of printer and Y to micro-stepping be respectively 1/90 inch, 1/180 inch, 1/360 inch).
Define a matrix grid, use stylus printer to print the matrix sign indicating number, then print nonstandard matrix code sign inevitably, bring difficulty to Symbol recognition, its technology realizes that the result is:
According to the standard translator of matrix sign indicating number, area array CCD can't not wait these two dark-and-light colour dimension of picture, module point in irregular shape converts binary " 1 " and " 0 " exactly to.
The purpose of this invention is to provide a kind of new matrix code printing and recognition methods, solve to use stylus printer in the limited small size of ticket, to print the matrix sign indicating number, use stylus printer on multi-coupon invoice, to print the technology connection problem of matrix sign indicating number, and how to use the ccd image picture pick-up device on the standard code rule-based approach, to discern the technical matters of this nonstandard matrix sign indicating number.
The object of the present invention is achieved like this:
A kind of new matrix code printing and recognition methods, the X that it is characterized in that defining each module of matrix sign indicating number is respectively 1/180 inch multiple to spacing to spacing and Y, during coding, the coded data that needs is converted to code sign uses standard code program composition to become the foursquare graphic file of binary name, extract " 1 " and " 0 " data of this code sign line by line, according to spacing (X, Y) 1/180 inch multiple numerical value, on each center of a lattice position of the grid matrix that these data are formed, determine " 1 " and " 0 ", determined the module of size in each center of a lattice printing of the matrix of layout newly.
This new matrix code printing and recognition methods, when it is characterized in that using 9 needle type printers to print the matrix sign indicating number according to 1/180 inch 5 multiple, its X is after going out stylus printer and printing the 1st site, and the distance of printing the center, 1 site, center to the in the 2nd site is 1/180 inch; Its Y is 1/180 inch to the distance at the center, 1 site, the 2nd center to the, site that goes out the stylus printer seal; With the center of printing the 1st site is 0 point, prints the 3rd site at its X to 1/180 inch * 5 distance, and the distance of printing the center, 3 sites, center to the in the 4th site is 1/180 inch; With the center of printing the 1st site is 0 point, print the 3rd site at its Y to 1/180 inch * 5 distance, the distance of printing the center, 3 sites, center to the in the 4th site is 1/180 inch, and each module is formed by 2 * 2 sites, by that analogy, form an X and Y to matrix.
This new matrix code printing and recognition methods, when the stylus printer that it is characterized in that 24 pins is printed the matrix sign indicating number according to 1/180 inch 5 multiple, its X is after going out stylus printer and printing the 1st site, the distance of printing the center, 1 site, center to the in the 2nd site is 1/180 inch, and the distance of printing the center, 2 sites, center to the in the 3rd site is 1/180 inch; Its Y is 1/180 inch to the distance at the center, 1 site, the 2nd center to the, site that goes out the stylus printer seal, and the distance that goes out the center, 2 sites, the 3rd center to the, site of stylus printer seal is 1/180 inch; With the center of printing the 1st site is 0 point, print the 4th site at its X to 1/180 inch * 5 distance, the distance of printing the center, 4 sites, center to the in the 5th site is 1/180 inch, and the distance of printing the center, 5 sites, center to the in the 6th site is 1/180 inch; With the center of printing the 1st site is 0 point, print the 4th site at its Y to 1/180 inch * 5 distance, the distance of printing the center, 4 sites, center to the in the 5th site is 1/180 inch, the distance of printing the center, 5 sites, center to the in the 6th site is 1/180 inch, each module is formed by 3 * 3 sites, by that analogy, form an X and Y to matrix.
This new matrix code printing and recognition methods, it is characterized in that matrix apart from the module composition of printing with 1/180 inch * 5, at X and Y both direction, can arrange out stylus printer to print or do not go out the module of the adopted specification of stylus printer lettering arbitrarily with 1/180 inch * 5 multiple relation.
This new matrix code printing and recognition methods when it is characterized in that using CCD image picture pick-up device to discern this matrix sign indicating number, need provide a square net matrix of forming according to 1/180 inch multiple relation as recognition mode.
This new matrix code printing and recognition methods, it is characterized in that each the square center of a lattice with this grid matrix is the center, the length of side with each square lattice of this grid matrix is a radius, 40-70% length with this radius is that effective length is drawn circle, if be dark in this circle, then be judged as binary " 1 ",, then be judged as binary " 0 " in this circle if be light color.
Specify below in conjunction with embodiment and the objective of the invention is how to realize:
A kind of new matrix code printing and recognition methods, it is characterized in that the X of each module of matrix sign indicating number is respectively 1/180 inch multiple to spacing to spacing and Y, during coding, the coded data that needs is converted to code sign uses standard code program composition to become the foursquare graphic file of binary name, extract " 1 " and " 0 " data of this code sign line by line, according to spacing (X, Y) 1/180 inch multiple numerical value, on each center of a lattice position of the grid matrix that these data are formed, determine " 1 " and " 0 ", determined the module of size in each center of a lattice printing of the matrix of layout newly.
This new matrix code printing and recognition methods, when it is characterized in that using 9 needle type printers to print the matrix sign indicating number according to 1/180 inch 5 multiple, its X is after going out stylus printer and printing the 1st site, and the distance of printing the center, 1 site, center to the in the 2nd site is 1/180 inch; Its Y is 1/180 inch to the distance at the center, 1 site, the 2nd center to the, site that goes out the stylus printer seal; With the center of printing the 1st site is 0 point, prints the 3rd site at its X to 1/180 inch * 5 distance, and the distance of printing the center, 3 sites, center to the in the 4th site is 1/180 inch; With the center of printing the 1st site is 0 point, print the 3rd site at its Y to 1/180 inch * 5 distance, the distance of printing the center, 3 sites, center to the in the 4th site is 1/180 inch, and each module is formed by 2 * 2 sites, by that analogy, form an X and Y to matrix.
This new matrix code printing and recognition methods, when the stylus printer that it is characterized in that 24 pins is printed the matrix sign indicating number according to 1/180 inch 5 multiple, its X is after going out stylus printer and printing the 1st site, the distance of printing the center, 1 site, center to the in the 2nd site is 1/180 inch, and the distance of printing the center, 2 sites, center to the in the 3rd site is 1/180 inch; Its Y is 1/180 inch to the distance at the center, 1 site, the 2nd center to the, site that goes out the stylus printer seal, and the distance that goes out the center, 2 sites, the 3rd center to the, site of stylus printer seal is 1/180 inch; With the center of printing the 1st site is 0 point, print the 4th site at its X to 1/180 inch * 5 distance, the distance of printing the center, 4 sites, center to the in the 5th site is 1/180 inch, and the distance of printing the center, 5 sites, center to the in the 6th site is 1/180 inch; With the center of printing the 1st site is 0 point, print the 4th site at its Y to 1/180 inch * 5 distance, the distance of printing the center, 4 sites, center to the in the 5th site is 1/180 inch, the distance of printing the center, 5 sites, center to the in the 6th site is 1/180 inch, each module is formed by 3 * 3 sites, by that analogy, form an X and Y to matrix.
This new matrix code printing and recognition methods, it is characterized in that matrix apart from the module composition of printing with 1/180 inch * 5, at X and Y both direction, can arrange out stylus printer to print or do not go out the module of the adopted specification of stylus printer lettering arbitrarily with 1/180 inch * 5 multiple relation.
This new matrix code printing and recognition methods when it is characterized in that using CCD image picture pick-up device to discern this matrix sign indicating number, need provide a square net matrix of forming according to 1/180 inch multiple relation as recognition mode.
This new matrix code printing and recognition methods, it is characterized in that each the square center of a lattice with this grid matrix is the center, the length of side with each square lattice of this grid matrix is a radius, 40-70% length with this radius is that effective length is drawn circle, if be dark in this circle, then be judged as binary " 1 ",, then be judged as binary " 0 " in this circle if be light color.
To use the matrix sign indicating number on VAT invoice is example, and the maximum area that the VAT invoice of national current edition can be printed the matrix sign indicating number is 21mm
2, according to existing invoice paper size and invoice ticket information amount, the otherwise designed nominal value, the useful area maximum of printing the matrix sign indicating number also only is 32mm
2
Use GB QR sign indicating number with existing VAT invoice version specification, the area that code sign can take is 20mm
2Also all clear for guaranteeing nine kinds of needles with the site all clear and every copy, site of 24 needle printers printing, need the nine kinds of needles printer prints to go out the combination of 2 * 2 pin mark, 24 needle printers print 3 * 3 pin mark combination. because the pin diameter of nine kinds of needles printer is greater than the pin diameter of 24 needle printers, the diameter of the sub-circular of these two kinds different pin marks compositions is basic identical, about 0.689mm.
Because the micro-stepping of present general pin type bill printer is 1/180 inch a multiple, if determine the module size of matrix sign indicating number according to the pin diameter of printer, will there be an error in module size all the time with the intermodule distance.Use the coded program of present standard QR sign indicating number, its reference data has two, one is the micro-stepping of printer, one is the pin diameter of print needle, no matter use which data, two results are caused in the capital: or intermodule is apart from greater than the print module of reality, or intermodule is apart from the print module less than reality, and both all violate symbol and print rule.
The method of dealing with problems is:
1. at first determine the size of print module, as be defined as 0.6889mm;
2. then, (X Y), as is defined as 1/180 inch * 5, about 0.7056mm according to the micro-stepping determination module spacing of printer;
3. when encoding, about 80 bit data that needs converted to code sign use standard code program composition to become the foursquare graphic file of binary name, and the utilization structure link is divided into 1 * 3 1-Q version;
4. extract " 1 " and " 0 " data of this code sign line by line, (X, Y) 1/180 inch * 5 numerical value are determined " 1 " and " 0 " on each center of a lattice position of the grid matrix that these data are formed according to spacing;
5. drive printer and go out pin, determined the module of size in each center of a lattice printing of the matrix of layout newly, print position is the nominal value password area.
The code sign printing stage finishes, and enters the typing cognitive phase:
1. use area array CCD scan code symbol;
2. extract spacing and be (X, Y) the matrix grid of 1/180 inch * 5 numerical value carries out benchmark as recognition mode and the code sign image that has scanned and compares;
3. the length of side with each square lattice of this grid matrix is a radius, 40-70% length with this radius is that effective length is drawn circle, if be dark in this circle, then is judged as binary " 1 ", if be light color, then be judged as binary " 0 " in this circle;
4. binary " 1 " and " 0 " data are sent into the decoding of standard translator.
5. output data.
The typing cognitive phase finishes.
Advantage of the present invention is can effectively utilize impact printer in the littler area of ticket Printing the matrix code uses for the automatic identification of computer information system.
Claims (6)
1. new matrix code printing and recognition methods, it is characterized in that the X of each module of matrix sign indicating number is respectively 1/180 inch multiple to spacing to spacing and Y, during coding, the coded data that needs is converted to code sign uses standard code program composition to become the foursquare graphic file of binary name, extract " 1 " and " 0 " data of this code sign line by line, according to spacing (X, Y) 1/180 inch multiple numerical value, on each center of a lattice position of the grid matrix that these data are formed, determine " 1 " and " 0 ", determined the module of size in each center of a lattice printing of the matrix of layout newly.
2. a kind of new matrix code printing according to claim 1 and recognition methods, when it is characterized in that using 9 needle type printers to print the matrix sign indicating number according to 1/180 inch 5 multiple, its X is after going out stylus printer and printing the 1st site, and the distance of printing the center, 1 site, center to the in the 2nd site is 1/180 inch; Its Y is 1/180 inch to the distance at the center, 1 site, the 2nd center to the, site that goes out the stylus printer seal; With the center of printing the 1st site is 0 point, prints the 3rd site at its X to 1/180 inch * 5 distance, and the distance of printing the center, 3 sites, center to the in the 4th site is 1/180 inch; With the center of printing the 1st site is 0 point, print the 3rd site at its Y to 1/180 inch * 5 distance, the distance of printing the center, 3 sites, center to the in the 4th site is 1/180 inch, and each module is formed by 2 * 2 sites, by that analogy, form an X and Y to matrix.
3. a kind of new matrix code printing according to claim 1 and recognition methods, when the stylus printer that it is characterized in that 24 pins is printed the matrix sign indicating number according to 1/180 inch 5 multiple, its X is after going out stylus printer and printing the 1st site, the distance of printing the center, 1 site, center to the in the 2nd site is 1/180 inch, and the distance of printing the center, 2 sites, center to the in the 3rd site is 1/180 inch; Its Y is 1/180 inch to the distance at the center, 1 site, the 2nd center to the, site that goes out the stylus printer seal, and the distance that goes out the center, 2 sites, the 3rd center to the, site of stylus printer seal is 1/180 inch; With the center of printing the 1st site is 0 point, print the 4th site at its X to 1/180 inch * 5 distance, the distance of printing the center, 4 sites, center to the in the 5th site is 1/180 inch, and the distance of printing the center, 5 sites, center to the in the 6th site is 1/180 inch; With the center of printing the 1st site is 0 point, print the 4th site at its Y to 1/180 inch * 5 distance, the distance of printing the center, 4 sites, center to the in the 5th site is 1/180 inch, the distance of printing the center, 5 sites, center to the in the 6th site is 1/180 inch, each module is formed by 3 * 3 sites, by that analogy, form an X and Y to matrix.
4. according to claim 2 and 3 described a kind of new matrix code printing and recognition methodss, it is characterized in that matrix apart from the module composition of printing with 1/180 inch * 5, at X and Y both direction, can arrange out stylus printer to print or do not go out the module of the adopted specification of stylus printer lettering arbitrarily with 1/180 inch * 5 multiple relation.
5. according to described a kind of new matrix code printing of claim 1-4 and recognition methods, when it is characterized in that using CCD image picture pick-up device to discern this matrix sign indicating number, need provide a square net matrix of forming according to 1/180 inch multiple relation as recognition mode.
6. a kind of new matrix code printing according to claim 5 and recognition methods, it is characterized in that each the square center of a lattice with this grid matrix is the center, the length of side with each square lattice of this grid matrix is a radius, 40-70% length with this radius is that effective length is drawn circle, if be dark in this circle, then be judged as binary " 1 ",, then be judged as binary " 0 " in this circle if be light color.
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| Application Number | Priority Date | Filing Date | Title |
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| CN01131222.XA CN1336583A (en) | 2001-09-03 | 2001-09-03 | Matrix code printing and identifying method |
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| CN01131222.XA CN1336583A (en) | 2001-09-03 | 2001-09-03 | Matrix code printing and identifying method |
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| CN102411797A (en) * | 2010-09-20 | 2012-04-11 | 航天信息股份有限公司 | Method and device for printing bill information |
| CN102446264A (en) * | 2010-10-15 | 2012-05-09 | 航天信息股份有限公司 | Printing and scanning recognition method and system for two-dimensional code of special value-added tax invoice |
| CN102806776A (en) * | 2011-06-02 | 2012-12-05 | 航天信息股份有限公司 | Method for printing two-dimensional bar code on multi-copy bill by stylus printer |
| CN102810149A (en) * | 2011-06-02 | 2012-12-05 | 航天信息股份有限公司 | Quick response matrix code position detection graph and building method thereof |
| CN102810171A (en) * | 2011-06-02 | 2012-12-05 | 航天信息股份有限公司 | Chinese-sensible code and construction method thereof |
| CN102806788A (en) * | 2011-06-02 | 2012-12-05 | 航天信息股份有限公司 | Method for printing special matrix type two-dimensional barcode on multiplex bill |
| CN102810150A (en) * | 2011-06-02 | 2012-12-05 | 航天信息股份有限公司 | Dislocation-priority special-shape matrix type two-dimensional barcode arrangement method |
| CN102810163A (en) * | 2011-06-02 | 2012-12-05 | 航天信息股份有限公司 | Picture channel and information transfer method thereof |
| CN102855267A (en) * | 2005-04-18 | 2013-01-02 | 斯蒂勒·乌德 | Method and apparatus for handling of information |
| CN103400172A (en) * | 2011-07-19 | 2013-11-20 | 北京中科联众科技股份有限公司 | Point bitmap and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102855267A (en) * | 2005-04-18 | 2013-01-02 | 斯蒂勒·乌德 | Method and apparatus for handling of information |
| CN102411797A (en) * | 2010-09-20 | 2012-04-11 | 航天信息股份有限公司 | Method and device for printing bill information |
| CN102446264A (en) * | 2010-10-15 | 2012-05-09 | 航天信息股份有限公司 | Printing and scanning recognition method and system for two-dimensional code of special value-added tax invoice |
| CN102810171A (en) * | 2011-06-02 | 2012-12-05 | 航天信息股份有限公司 | Chinese-sensible code and construction method thereof |
| CN102806776B (en) * | 2011-06-02 | 2015-05-06 | 航天信息股份有限公司 | Method for printing two-dimensional bar code on multi-copy bill by stylus printer |
| CN102806788A (en) * | 2011-06-02 | 2012-12-05 | 航天信息股份有限公司 | Method for printing special matrix type two-dimensional barcode on multiplex bill |
| CN102810150A (en) * | 2011-06-02 | 2012-12-05 | 航天信息股份有限公司 | Dislocation-priority special-shape matrix type two-dimensional barcode arrangement method |
| CN102810163A (en) * | 2011-06-02 | 2012-12-05 | 航天信息股份有限公司 | Picture channel and information transfer method thereof |
| CN102806776A (en) * | 2011-06-02 | 2012-12-05 | 航天信息股份有限公司 | Method for printing two-dimensional bar code on multi-copy bill by stylus printer |
| CN102810149B (en) * | 2011-06-02 | 2016-03-02 | 航天信息股份有限公司 | Quick response matrix code position sensing figure and construction method thereof |
| CN102806788B (en) * | 2011-06-02 | 2015-10-21 | 航天信息股份有限公司 | A kind of method printing special-shaped matrix two-dimensional barcode on multiple part bills |
| CN102810163B (en) * | 2011-06-02 | 2015-03-25 | 航天信息股份有限公司 | Picture channel and information transfer method thereof |
| CN102810150B (en) * | 2011-06-02 | 2015-04-08 | 航天信息股份有限公司 | Dislocation-priority special-shape matrix type two-dimensional barcode arrangement method |
| CN102810149A (en) * | 2011-06-02 | 2012-12-05 | 航天信息股份有限公司 | Quick response matrix code position detection graph and building method thereof |
| CN102810171B (en) * | 2011-06-02 | 2015-06-10 | 航天信息股份有限公司 | Chinese-sensible code and construction method thereof |
| CN103400172A (en) * | 2011-07-19 | 2013-11-20 | 北京中科联众科技股份有限公司 | Point bitmap and manufacturing method thereof |
| CN103400172B (en) * | 2011-07-19 | 2016-09-28 | 北京中科联众科技股份有限公司 | Bit map/bitmap manufacture method and the bit map/bitmap made by the method |
| CN103909741A (en) * | 2012-12-30 | 2014-07-09 | 航天信息股份有限公司 | Method and apparatus for printing two-dimensional code by use of 9-pin printer in embedded system |
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