CN101794404A - Method for coding and reading invisible two-dimensional codes - Google Patents
Method for coding and reading invisible two-dimensional codes Download PDFInfo
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- CN101794404A CN101794404A CN201010121154A CN201010121154A CN101794404A CN 101794404 A CN101794404 A CN 101794404A CN 201010121154 A CN201010121154 A CN 201010121154A CN 201010121154 A CN201010121154 A CN 201010121154A CN 101794404 A CN101794404 A CN 101794404A
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Abstract
The invention relates to invisible two-dimensional codes, wherein a positioning part comprises a strip-shaped reference code element and a strip-shaped orientation code element which are vertically arranged mutually; a data part comprises a plurality of circular or square data code elements; virtual cables which are uniformly distributed along the transverse direction and the vertical direction are virtually arranged in each code word region according to the first interval L, the cross points of the virtual cables form virtual lattice points, and the centers of the reference code element and the orientation code element are respectively positioned at one of the virtual lattice points; a plurality of virtual cavities for arranging data code elements are formed at each of the other virtual lattice points along the transverse direction or/and the vertical direction with a deviation of the second interval d according to different permutation and combination, and only one data code element is arranged on the basis of each virtual lattice point; and according to the weight of each virtual lattice point and the weight of each deviation direction of the data code elements in the same code element region, all data code elements are weighed and combined in cascades to acquire corresponding code values. The invisible two-dimensional codes of the invention have larger code value space under the same code word area and code element density.
Description
Technical field
The present invention relates to the coding and the reading method of a kind of two-dimension code, particularly a kind of invisible two-dimensional codes.
Background technology
Two-dimension code is because big, the plurality of advantages such as coding range is wide, error correcting capability is strong, good confidentiality of its information capacity, be used widely in all trades and professions rapidly, printed QR sign indicating number (two-dimension code a kind of on the train ticket that China uses recently by national standard, QR is the abbreviation of Quick Response, i.e. rapid reaction).
Popular two-dimension code mostly is square matrix code at present, represents data 1 or 0 with regularly arranged black, white blocks in the rectangular area of an agreement.The all possible data field that is arranged to form this 2 D code system of black, white blocks diverse location in the rectangular area of agreement.
For ease of narration, below we are called " code word " with top said " rectangular area of agreement "; Black, white blocks are called " code element "; Certain combination numeric value represented of code element in the code word is called " code value "; All code values that can characterize code word call " sign indicating number territory "; The code value total amount that comprises in the sign indicating number territory is called " sign indicating number amount ".
Except can characterization data, two-dimension code also must be able to correctly be distinguished, otherwise two-dimension code is just without any practical value.Usually, the two-dimension code deviser can embed some changeless graphic (Pattern) location and directed foundation as the recognition code word in code word.For example, that three location are set in the upper left corner, the upper right corner, the lower left corner of its code word is graphic for QR sign indicating number shown in Figure 1; DM sign indicating number shown in Figure 2 is at the left side and the following complete black frame or the like that is provided with of its code word.These graphic effects are positions of location code word and read a yard direction.
Having many uses of two-dimension code can be printed as attribute that plain code is used to identify commodity, specification etc., also can be printed as the dark line that naked eyes are difficult for discovering and be embedded in the printed article, as anti-counterfei waterprint or certain sign.A kind of special application is, diverse location at printed article embeds the different two-dimension code of code value, by custom-designed recognizer the printed article diverse location is distinguished, obtain being embedded in the two-dimension code code value of this position, carry out predetermined actions according to the code value that obtains then, such as sending corresponding sound, playing corresponding video frequency program etc.In this application, usually recognizer is designed to lip pencil, be called talking pen visually; Abbreviate this special two-dimension code as stealthy sign indicating number; The printed article that embeds stealthy sign indicating number is called multi-media book.
Obviously, in talking pen is used,, disturbs body matter for fear of being formed, must must be as far as possible little symbol design, and the density between the code element is rare as far as possible.In addition, in order accurately to identify the fine pattern that intersection is gathered, the area of code word is the smaller the better.Therefore, concerning talking pen was used, the invisible two-dimensional codes of employing must be in the code word area of trying one's best little, to try one's best little and few code element of trying one's best, to obtain the big sign indicating number of trying one's best and measure.
Fig. 3 is a kind of code word synoptic diagram of invisible two-dimensional codes.Wherein, a code word is divided into 4 * 4 rectangular blocks 301, four jiaos of lattice points 302 that a location usefulness is all arranged of each rectangular block 301, the center 303 of each rectangular block 301 is layout centers of data symbols 304, and data symbols 304 is arranged on upper and lower, the left side of central point 303 or the right avertence position from distance to a declared goal by the requirement of represented code value.The lattice point 305 in code word bosom is towards a certain direction skew distance to a declared goal, so that the direction of recognition code word to be provided.Like this, the data symbols 304 in each rectangular block 301 can be represented one 2 bit, and 16 2 bits of 16 rectangular block 301 representatives can be represented (22)
16=2
32=4294967269 decimal numbers, promptly the sign indicating number amount is 4294967269.
At application number is 200610075770.8, and publication number is in the patented claim of CN101064013A, and above-mentioned two-dimension code has been carried out improvement as shown in Figure 4.Wherein, code word 401 comprises a table header 402 and a data portion 403.Comprise a plurality of location code elements 404 of arranging in the table header 402, be used to provide the direction and the boundary of recognition code word by predetermined way.Data portion 403 is divided into some state regions 405, and a data code element 406 is set in each state region 405, and data symbols 406 is positioned at according to the numerical value that characterizes among any one of 4 virtual regions dividing equally state region 405.In code word shown in Figure 4,7 location code elements of table header, 9 data code elements of data portion.9 data code elements can represent (2
2)
9=2
18=262144 decimal numbers, the sign indicating number amount of the two-dimension code after promptly so improving is 262144.
In fact, the symbol design of data division is identical in the code word of Fig. 3 and Fig. 4, and the improvement of Fig. 4 mainly is table header, i.e. localization part.Because the code element that is used to locate reduces to some extent, its code word area utilization increases, thereby can design code word littler, makes it littler to the influence of body matter.Obviously, with respect to code word shown in Figure 3, the improvement code word of Fig. 4 is more suitable for using in the talking pen field.
Yet still there is the inadequate problem of code word area utilization in this code word, to such an extent as to the sign indicating number amount of the stealthy sign indicating number of this kind is less.
Summary of the invention
Still there is the inadequate problem of code word area utilization in code word at existing invisible two-dimensional codes, the present invention will propose a kind of better invisible two-dimensional codes system and reading method thereof, on littler code word area, under the prerequisite that does not increase code element density and recognition difficulty, obtain bigger sign indicating number amount.
For solving the problems of the technologies described above, the present invention proposes a kind of invisible two-dimensional codes, in each code word district, comprise localization part and data division, comprise the strip reference symbol and a directed code element of strip vertical with described reference symbol on direction of a horizontal or vertical placement in the described localization part;
Comprise a plurality of circles or square data code elements in the described data division;
In the described code word district of each invisible two-dimensional codes, be provided with along horizontal, vertical equally distributed virtual netting twine by the first spacing L is virtual, described virtual netting twine intersects a plurality of virtual lattice points of formation, and the center of described reference symbol and directed code element lays respectively at one of them virtual lattice point place;
Laterally form a plurality of virtual holes that are used to be provided with data symbols based on each virtual lattice point edge, and only in a described virtual hole data code element is set therein based on each virtual lattice point or/and vertically be offset the different permutation and combination of the second spacing d.
In a preferred embodiment of the present invention, described directed code element is positioned at from described reference symbol along its lateral excursion M doubly the first spacing L and along its vertical skew N position of the first spacing L doubly; M wherein, N are equal to or greater than 0 natural number, and wherein at least one greater than 0; The described second spacing d is 1.5 times of data symbols diameter, and the 4-10 that the described first spacing L is the second spacing d doubly.
In the preferred version among the present invention, described virtual netting twine intersects the virtual lattice point that forms can form 3 * 3,3 * 4,4 * 4, the perhaps matrix of other combinations, wherein two virtual lattice points are used to be provided with reference symbol, directed code element, and remaining virtual lattice point is used to be provided with data symbols.
The present invention also proposes a kind of method that above-mentioned invisible two-dimensional codes is distinguished, and its spy is, may further comprise the steps:
(1), receives from the image that contains at least 1 code word of the printed article photographs gained that is printed on described invisible two-dimensional codes;
(2), in image by from left to right, mode from top to bottom, seeks a strip location code element, and to establish it be imaginary reference symbol;
(3), be the center with described imaginary reference symbol, the direction of pointing to along the narrow limit of its strip is offset M * L to the right, offsets downward N * the L position, level and vertical both direction ± seek in the L/2 scope, or be offset M * L left, upwards be offset N * L place and do same searching, if find one with respect to the vertical strip code element of placing of described imaginary reference symbol, then this strip code element is directed code element, and the described imaginary reference symbol of simultaneous verification is real reference symbol.Described two kinds of searching modes only may find a directed code element, and a kind of mode in back is represented to take direction and rotated 180 °.If do not find described directed code element, illustrate that then described imaginary reference symbol is not real reference symbol, get back to step (2) this moment, seeks next imaginary reference symbol and handle equally, up to finding directed code element;
(4), according to the position of described reference symbol, directed code element, and they are in the rule of arranging in described code element district, calculate the position of each virtual lattice point; Near each virtual lattice point, seek corresponding data symbols then; According to the weight of described each data symbols, can determine the digit value of each data symbols in the representative of this code element district to the direction of displacement of virtual lattice point; According to the weight of the virtual lattice point that data symbols centered on, all data symbols are weighted the cascade combination again, can obtain the code value of current code word image representative.
Owing to taked technique scheme, compare with the code word of existing two-dimension code, reference symbol, directed code element only take in total code element 2 among the present invention, obviously have bigger code value space under same code word area and code element density conditions.
Description of drawings
Fig. 1 is the code word synoptic diagram of QR sign indicating number in the prior art;
Fig. 2 is the code word synoptic diagram of DM sign indicating number in the prior art;
Fig. 3 is the code word synoptic diagram of a kind of invisible two-dimensional codes in the prior art;
Fig. 4 is the code word synoptic diagram of the invisible two-dimensional codes after a kind of improvement the in the prior art;
Fig. 5 is that the element position of the invisible two-dimensional codes of one embodiment of the invention concerns synoptic diagram;
Fig. 6 is that data symbols shown in Figure 5 illustrates synoptic diagram from the direction of displacement of virtual lattice point and the weight of corresponding numerical value;
Fig. 7 is that the code value of invisible two-dimensional codes in the one embodiment of the invention is the code word synoptic diagram of octal numeral 0123456765;
Fig. 8 is that the code word that 64 code values of the invisible two-dimensional codes of one embodiment of the invention are octal numeral 0123456765 is arranged the synoptic diagram of printing by 8 * 8 matrix forms;
Fig. 9 is that the code value of being made up of 16 code elements of one embodiment of the invention is the code word synoptic diagram of octal numeral 01234567654321;
Figure 10 be in the one embodiment of the invention directed code element at the synoptic diagram in the code word upper right corner;
Figure 11 be in the one embodiment of the invention reference symbol or/and directed code element at the synoptic diagram at code word middle part.
Embodiment
In one embodiment of the present of invention, the signal of the code element of code word relation is as Fig. 5.Wherein, the strip reference symbol 502 that is used to locate of a horizontal positioned is arranged in the upper left corner in code word district 501, be offset 3L at reference symbol 502 centers to the right and offset downward the directed code element 503 of strip that the 2L place is perpendicular placement again.
Center with reference symbol 502 and directed code element 503 is to angular vertex, is laterally carrying out 3 five equilibriums, is vertically carrying out the virtual lattice point 505 that 2 five equilibriums calculate virtual netting twine 504 and netting twine intersection point place.
Around each virtual lattice point 505 to level or/and each offset distance d of vertical direction has 8 virtual holes 507 of code element, form a code element district 506.A data code element 508 can only be contained in each code element district 506, and this data symbols 508 must be arranged within 8 virtual holes 507 in this code element district 506 any one.All data symbols 508 all are small circular or square code elements.
The virtual hole 507 of 8 code elements in same code element district 506 has different weights, represents different numerical value when data symbols 508 is positioned at different virtual hole 507.In the present embodiment, represent 0 when specified data code element 508 is positioned at the virtual hole of the code element in 506 lower left corners, code element district, other that be positioned at thus to the right, make progress counterclockwise are represented numerical value 1～7 respectively during virtual hole, and promptly a code element district 506 can represent (2
3=) 8 numerical value.Data symbols 508 in code element district 506 the position and the relation of the numerical value of representative as shown in Figure 6.
In the present embodiment, except the virtual lattice point that reference symbol 502 and directed code element 503 take, also have 10 virtual lattice points, corresponding 10 code element districts can hold 10 8 system data bit.Therefore, the sign indicating number amount of present embodiment is for (2
3)
10=2
30=1,073,741,824.
In the practicality, if the printing precision that adopts is 1200dpi, one group of relatively more suitable design parameter is that reference symbol is become 0.02115 * 0.0846mm with directed symbol design
2Rectangular, data symbols is designed to the disk of diameter 0.0423mm, the spacing L=0.3384mm of virtual lattice point, the offset distance d=0.0423mm of center, virtual hole and virtual lattice point.Like this, the area of a code word has only 1.0152 * 1.3536mm
2, the code word area utilization obviously is very high.
In the practical application, the virtual netting twine of drawing among Fig. 5 504, " * " on the virtual lattice point 505 and virtual hole 507 do not exist, and it is drawn out just for the position relation of each code element is described.Fig. 7 is the practical code word synoptic diagram after code word shown in Figure 5 is cancelled these virtual elements.
Find out by Fig. 5, from reference symbol, 10 code element districts 506 are arranged to the right, downwards respectively, the data symbols in each code element district lays respectively at that weight is followed successively by in 0,1,2,3,4,5,6,7,6,5 the virtual hole in the district, so 10 data code elements are represented the number 0,1,2,3,4,5,6,7,6,5 of octal numeral respectively among the figure.In addition, regulation is from reference symbol, to the right, the weight in each code element district of being arranged in order downwards is respectively 8
9, 8
8, 8
7, 8
6, 8
5, 8
4, 8
3, 8
2, 8
1, 8
0, the code value of the code word among Fig. 7 should be octal numeral 0123456765 as can be known.
Fig. 8 is of the present invention by the synoptic diagram of 64 code values shown in Figure 7 code word that is octal numeral 0123456765 by the printing of 8 * 8 matrix forms.Two-dimension code often is embedded in the printed article as dark line with this matrix form array configuration in the practicality.
For the invisible two-dimensional codes in the above embodiment of the present invention, can distinguish according to the following steps:
(1), take pictures facing to the printed article that is printed on the stealthy sign indicating number of the present invention, obtain containing the image of at least 1 code word with the optics talking pen.
(2), the taking lens in the talking pen has special light sources, the image of shooting carries out filtering to other colors, the image that obtains only contains the color and background look that prints invisible two-dimensional codes of the present invention.In case of necessity, can also utilize software that the image of taking is carried out binary conversion treatment, obtain only containing accurately the black white image of the stealthy sign indicating number of the present invention.
(3), in image according to pixels from left to right, mode from top to bottom, seek a strip location code element, it is reference symbol 502 for an imagination.
(4), be the center with the imaginary reference symbol 502 that finds, the direction of pointing to along the narrow limit of its strip is offset 3L to the right, offset downward 2L be in level and vertical 2 directions ± seek strip orientation code element 503 in the L/2 scope.If find the strip code element of a vertical placement with reference symbol, then this code element is directed code element 503, and the imaginary reference symbol of simultaneous verification is reference symbol 502 really.
(5) if " (4) " step do not find directed code element, then change into the direction of pointing to by its narrow limit of mind-set in the reference symbol be offset left 3L, upwards be offset 2L be in level and vertical 2 directions ± seek strip orientation code element 503 in the L/2 scope.If find the strip code element of a vertical placement with reference symbol, then this code element is directed code element 503, and the imaginary reference symbol of simultaneous verification is reference symbol 502 really." (4) " and " (5) " two steps only may be found a directed code element 503, and corresponding situation is to take direction to have rotated 180 °.
(6) if " (4) " and " (5) " step is not all found directed code element 503, illustrate that the imaginary reference symbol that is found is not real reference symbol 502.Need abandon this imaginary reference symbol, forward the continuation of " (3) " step to and seek next imaginary reference symbol 502, and carry out the processing in " (4) ", " (5) " step, up to finding directed code element 503.
(7), in general, the image of shooting can just in time not be a level, and promptly code word direction and pixel orientation generally are inconsistent.Must image be rotated according to the position of reference symbol 502 and directed code element 503.Specific practice is: be the position that angular vertex is calculated code word upper right corner lattice point with reference symbol 502 and directed code element 503 a); B) be center of circle rotation entire image with the center of reference symbol 502, make upper right corner lattice point just in time be on the horizontal pixel line by reference symbol 502 centers.
(8), consider when taking generally accurate perpendicular alignmnet paper not of camera lens, so the image of shooting is understood some distortion, this need proofread and correct with software according to the actual photographed effect, makes the shooting effect of image be equivalent to vertical shooting.The code word that regulation photographs at every turn in the invention process is no less than 2, can proofread and correct according to the reference symbol 502 of these 2 code words and the position deviation of directed code element 503.
(9), after this, go out the position of each virtual lattice point 505 according to the position calculation of reference symbol 502 and directed code element 503; Near each virtual lattice point 505, find corresponding data symbols 508 then; According to the weight of the direction of displacement of 508 pairs of virtual lattice points 505 of data symbols, determine the digit value of each data symbols 508 representative; The weight of the virtual lattice point that is centered on according to data symbols 508 is weighted the cascade combination to all data symbols then, obtains the code value of this code word representative.
(10), stealthy sign indicating number sign indicating number amount of the present invention greatly, can tell the error correction computing that a part is used for code word recognition, so as to take and printing in mistake correct.
In actual the use, take in the image that obtains and generally comprise a more than code word, other code words are handled equally, can obtain the code value of other code words.The present invention regulation, the code word that finds for the first time according to above-mentioned reading method is effective code word, other code words that this shooting obtains only are used for effective code word is carried out auxiliary positioning and the code value of effective code word is carried out error checking and correction, do not use as actual code value.
Obviously, compare with code word shown in Figure 4, code word area of the present invention has reduced 1/4 (being reduced to 12 code elements by 16 code elements), the sign indicating number amount increases by 2
12Times, and do not increase code element density.For the application of talking pen, the present invention has significant advantage.
Mandatory declaration, code word design shown in Figure 5 is one embodiment of the present of invention just, are not construed as limiting the invention.Have multiple variation to include but not limited to following several in the practicality for selecting for use:
(1), can adopt the code element (as 3 row, 3 row, 4 row, 4 row, 4 row, 5 row etc.) of varying number in the practicality.Fig. 9 adopts the code word synoptic diagram of 16 code elements by another embodiment of 4 * 4 arranged, and its yard amount is increased to (2
3)
14=2
42=4,398,046,511,104.
(2), reference symbol and directed code element in code word the position and towards can suitably changing.Such as, reference symbol horizontal positioned, the vertical placement of directed code element etc.
(3), reference symbol and directed code element not necessarily just in time be positioned at angular vertex, can be positioned at any position, code word district.Such as, in the code word shown in Figure 10, the reference symbol position there is not change, and directed code element is positioned at the code word upper right corner, and such configuration is more convenient for distinguishing and rotation.In the code word shown in Figure 11, reference symbol or/and directed code element at code word middle part, such code word printing uniformity coefficient is relatively good.
(4), according to the practical application needs, the size of code element size and virtual lattice point distance and whole codeword all can change.
According to mentioned above principle, can comprise 1 reference symbol, a directed code element and 7 data code elements in the code word district of each invisible two-dimensional codes, totally 9 code elements are by 3 * 3 arranged;
Wherein, M=2 can be set, N=2, directed code element 503 was positioned at from reference symbol 502 and laterally was offset 2 times of first spacing L to the right and vertically offsets downward the position of 2 times of first spacing L along it along it this moment;
Perhaps, M=2 can be set, N=0, directed code element 503 was positioned at from reference symbol 502 and laterally was offset the position of 3 times of first spacing L to the right along it this moment;
Perhaps, also M=1 can be set, N=2, directed code element 503 was positioned at from described reference symbol 502 and laterally was offset 1 times of first spacing L to the right and vertically offsets downward the position of 2 times of first spacing L along it along it this moment.
In addition, can comprise 1 reference symbol, a directed code element and 10 data code elements in the code word district of each invisible two-dimensional codes, totally 12 code elements are by 3 * 4 arranged; Equally, wherein M=3 can be set, N=2 perhaps is provided with M=3, and N=0 perhaps is provided with M=2, N=2.
In addition, also can comprise 1 reference symbol, a directed code element and 14 data code elements in the code word district of each invisible two-dimensional codes, totally 16 code elements are by 4 * 4 arranged; Equally, wherein M=3 can be set, N=3 perhaps is provided with M=3, and N=0 perhaps is provided with M=2, N=3.
Claims (9)
1. an invisible two-dimensional codes comprises localization part and data division in each code word district, it is characterized in that,
The strip reference symbol (502) and a directed code element (503) of strip vertical with described reference symbol on direction that comprise a horizontal or vertical placement in the described localization part;
Comprise a plurality of circles or square data code elements (508) in the described data division;
In the described code word district of each invisible two-dimensional codes, be provided with along horizontal, vertical equally distributed virtual netting twine (504) by the first spacing L is virtual, described virtual netting twine (504) intersect to form a plurality of virtual lattice points (505), and the center of described reference symbol (502) and directed code element (503) lays respectively at one of them virtual lattice point (505) and locates;
Laterally form a plurality of virtual holes (507) that are used to be provided with data symbols based on each virtual lattice point (505) edge, and only in the described virtual hole (507) a data code element (508) is set therein based on each virtual lattice point (505) or/and vertically be offset the different permutation and combination of the second spacing d.
2. invisible two-dimensional codes according to claim 1 is characterized in that,
Described directed code element (503) is positioned at from described reference symbol (502) along its lateral excursion M doubly the first spacing L and along its vertical skew N position of the first spacing L doubly; M wherein, N are equal to or greater than 0 natural number, and wherein at least one greater than 0;
The described second spacing d is 1.5 times of data symbols (508) diameter, and the 4-10 that the described first spacing L is the second spacing d doubly.
3. invisible two-dimensional codes according to claim 1 is characterized in that, laterally forms 8 virtual holes that are used to be provided with data symbols or/and vertically be offset the different permutation and combination of the second spacing d based on each virtual lattice point (505) along it, in the x, y coordinate system that with described virtual lattice point (505) are the center, the coordinate in described 8 virtual holes be respectively (+d, 0), (+d ,+d), (0, + d), (d, + d), (d, 0), (d ,-d), (0,-d), (+d ,-d).
4. according to each described invisible two-dimensional codes among the claim 1-3, it is characterized in that, comprise 1 reference symbol, a directed code element and 7 data code elements in the code word district of each invisible two-dimensional codes, described 9 code elements are by 3 * 3 arranged;
M=2 wherein, N=2, described directed code element (503) is positioned at from described reference symbol (502) and laterally is offset 2 times of first spacing L to the right and vertically offsets downward the position of 2 times of first spacing L along it along it;
Perhaps, M=2 wherein, N=0, described directed code element (503) is positioned at from described reference symbol (502) and laterally is offset the position of 3 times of first spacing L to the right along it;
Perhaps, M=1 wherein, N=2, described directed code element (503) is positioned at from described reference symbol (502) and laterally is offset 1 times of first spacing L to the right and vertically offsets downward the position of 2 times of first spacing L along it along it.
5. according to each described invisible two-dimensional codes among the claim 1-3, it is characterized in that, comprise 1 reference symbol, a directed code element and 10 data code elements in the code word district of each invisible two-dimensional codes, described 12 code elements are by 3 * 4 arranged;
M=3 wherein, N=2, described directed code element (503) is positioned at from described reference symbol (502) and laterally is offset 3 times of first spacing L to the right and vertically offsets downward the position of 2 times of first spacing L along it along it;
Perhaps, M=3 wherein, N=0, described directed code element (503) is positioned at from described reference symbol (502) and laterally is offset the position of 3 times of first spacing L to the right along it;
Perhaps, M=2 wherein, N=2, described directed code element (503) is positioned at from described reference symbol (502) and laterally is offset 2 times of first spacing L to the right and vertically offsets downward the position of 2 times of first spacing L along it along it.
6. according to each described invisible two-dimensional codes among the claim 1-3, it is characterized in that, comprise 1 reference symbol, a directed code element and 14 data code elements in the code word district of each invisible two-dimensional codes, described 16 code elements are by 4 * 4 arranged;
M=3 wherein, N=3, described directed code element (503) is positioned at from described reference symbol (502) and laterally is offset 3 times of first spacing L to the right and vertically offsets downward the position of 3 times of first spacing L along it along it;
Perhaps, M=3 wherein, N=0, described directed code element (503) is positioned at from described reference symbol (502) and laterally is offset the position of 3 times of first spacing L to the right along it;
Perhaps, M=2 wherein, N=3, described directed code element (503) is positioned at from described reference symbol (502) and laterally is offset 2 times of first spacing L to the right and vertically offsets downward the position of 3 times of first spacing L along it along it.
7. method that the described invisible two-dimensional codes of claim 1 is distinguished, its spy is, may further comprise the steps:
(1), receives from the image that contains at least 1 code word of the printed article photographs gained that is printed on described invisible two-dimensional codes;
(2), in image by from left to right, mode from top to bottom, seeks a strip location code element, and to establish it be imaginary reference symbol;
(3), with described imaginary reference symbol is the center, the direction of pointing to along the narrow limit of its strip is offset M * L to the right, offset downward N * L position, level and vertical both direction ± seek in the L/2 scope, or be offset M * L left, upwards be offset N * L place and do same searching, if find one with respect to the vertical strip code element of placing of described imaginary reference symbol, then this strip code element is directed code element, the described imaginary reference symbol of simultaneous verification is real reference symbol, described two kinds of searching modes only may find a directed code element, and a kind of mode in back is represented to take direction and has been rotated 180 °, if do not find described directed code element, illustrate that then described imaginary reference symbol is not real reference symbol, get back to step (2) this moment, seek next imaginary reference symbol and handle equally, up to finding directed code element;
(4), according to the position of described reference symbol, directed code element, and they are in the rule of arranging in described code element district, calculate the position of each virtual lattice point; Near each virtual lattice point, seek corresponding data symbols then; According to the weight of described each data symbols, can determine the digit value of each data symbols in the representative of this code element district to the direction of displacement of virtual lattice point; According to the weight of the virtual lattice point that data symbols centered on, all data symbols are weighted the cascade combination again, can obtain the code value of the code word representative in the current code element district.
8. method according to claim 7 is characterized in that, in described step (3), also comprises the position according to reference symbol and directed code element, and image is rotated so that the code word direction step consistent with pixel orientation.
9. method according to claim 7 is characterized in that, in described step (1), also comprises described image is proofreaied and correct so that the shooting effect of image is equivalent to vertical step of taking.
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| CN201010121154A CN101794404A (en) | 2010-03-09 | 2010-03-09 | Method for coding and reading invisible two-dimensional codes |
| CN2010102309100A CN102194091B (en) | 2010-03-09 | 2010-07-06 | Method for coding invisible two-dimensional code, presswork and reading method |
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Cited By (9)
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| CN102298688A (en) * | 2011-05-18 | 2011-12-28 | 深圳市鑫全图科技有限公司 | Data output and input method for invisible three-dimensional coding |
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| CN104866801A (en) * | 2015-06-12 | 2015-08-26 | 矽照光电（厦门）有限公司 | Recognition device of multi-gray scale invisible two-dimension code |
| CN105373823A (en) * | 2015-12-08 | 2016-03-02 | 北京意锐新创科技有限公司 | Method and device for generating and reading dynamic two-dimensional codes |
| CN106022201A (en) * | 2016-05-10 | 2016-10-12 | 深圳龙贝物联网科技发展有限公司 | Omnidirectional readable two-dimensional bar code system and identifying and reading method thereof |
| CN110046688A (en) * | 2019-04-19 | 2019-07-23 | 南京江行联加智能科技有限公司 | A kind of bar code and its positioning and recognition methods |
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| CN102800243B (en) * | 2012-07-18 | 2015-06-24 | 长沙高新开发区湖大科园诺美网络技术有限公司 | Anti-counterfeiting annular code and encoding method thereof |
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| JPH10261058A (en) * | 1997-03-21 | 1998-09-29 | Dainippon Printing Co Ltd | Two-dimensional data code |
| US6565003B1 (en) * | 1998-12-16 | 2003-05-20 | Matsushita Electric Industrial Co., Ltd. | Method for locating and reading a two-dimensional barcode |
| US8031375B2 (en) * | 2005-04-28 | 2011-10-04 | Kenji Yoshida | Information input/output method using dot pattern |
| CN100511271C (en) * | 2006-11-16 | 2009-07-08 | 深圳市天朗时代科技有限公司 | Two-dimensional decoding method |
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2010
- 2010-03-09 CN CN201010121154A patent/CN101794404A/en active Pending
- 2010-07-06 CN CN2010102309100A patent/CN102194091B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102298688A (en) * | 2011-05-18 | 2011-12-28 | 深圳市鑫全图科技有限公司 | Data output and input method for invisible three-dimensional coding |
| CN104200251A (en) * | 2011-12-26 | 2014-12-10 | 华南理工大学 | Two-dimensional code |
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| CN102831373A (en) * | 2012-07-25 | 2012-12-19 | 罗晨 | Method for outputting data of multi concatenated code |
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| CN105373823B (en) * | 2015-12-08 | 2018-07-13 | 北京意锐新创科技有限公司 | Generation, read method and its device of dynamic two-dimension code |
| CN105373823A (en) * | 2015-12-08 | 2016-03-02 | 北京意锐新创科技有限公司 | Method and device for generating and reading dynamic two-dimensional codes |
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| CN110046688A (en) * | 2019-04-19 | 2019-07-23 | 南京江行联加智能科技有限公司 | A kind of bar code and its positioning and recognition methods |
| CN110046688B (en) * | 2019-04-19 | 2022-04-19 | 南京江行联加智能科技有限公司 | Bar code positioning and identifying method |
| CN110187708A (en) * | 2019-06-10 | 2019-08-30 | 大有智能科技(嘉兴)有限公司 | Positioning system and method |
| CN110187708B (en) * | 2019-06-10 | 2022-07-08 | 大有智能科技(嘉兴)有限公司 | Positioning system and method |
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| CN102194091A (en) | 2011-09-21 |
| CN102194091B (en) | 2013-11-20 |
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