CN114418050A - Anti-counterfeiting dot matrix code generating method and decoding method - Google Patents
Anti-counterfeiting dot matrix code generating method and decoding method Download PDFInfo
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
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- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
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Abstract
The invention relates to an anti-counterfeiting dot matrix code generating method and a decoding method, wherein the code generating method comprises the following steps: generating a positioning module and a correction module, wherein the positioning module comprises a code points with continuous centroids on a first straight line, the correction module comprises b code points with continuous centroids on a second straight line, and the slopes of the first straight line and the second straight line are not equal; acquiring data to be encoded; generating a data module according to data to be encoded, wherein four blank areas are reserved in the data module; and respectively adding three positioning modules and a correction module in the four blank areas to obtain the dot matrix code.
Description
Technical Field
The invention relates to an anti-counterfeiting dot-matrix code generating method and a decoding method, and belongs to the field of two-dimensional code anti-counterfeiting.
Background
The two-dimensional code, whether encrypted or not, tangible or intangible, large or small, black and white or colored, is a graphic symbol of recorded data, which can be copied and counterfeited. The scanning result of the copied fake two-dimensional code is consistent with the genuine product, and the authenticity cannot be identified. The current commonly used two-dimension code anti-counterfeiting method comprises the following steps: the background database is used for recording the code scanning record of the two-dimensional code, and a consumer can know whether the code has the code scanning record or not by inquiring the background database, so that the anti-counterfeiting effect can be achieved to a certain extent. But the network support is needed, and meanwhile, if the fake two-dimensional code is sold to the hands of the consumer along with the fake commodity in advance, the consumer cannot identify the authenticity through the code scanning record. Therefore, a new type of dot code suitable for use as an anti-counterfeit label for goods is needed.
The prior art is as follows:
1. for example, the dot matrix coding method of CN106874819A sparse dot matrix code control method recognizable by mobile phone has no design of positioning points, which results in that the picture does not support rotation recognition and is difficult to read when distortion is large, and no positioning points combine the dot matrix code with the background picture, so that the code is easily interfered by the background, and the code has low practicability.
2. The laser anti-counterfeiting and the ink anti-counterfeiting have the advantages of low cost, easy identification by consumers and the like, but the technical content is not high, and the anti-counterfeiting and the ink anti-counterfeiting are easy to imitate. Once a product using the anti-counterfeiting technology is imitated, the forged product not only loses the anti-counterfeiting capability, but also causes consumers to misunderstand that the forged and fake product is a genuine product, which brings serious harm, and the laser anti-counterfeiting and the ink anti-counterfeiting require special recognition equipment, which is usually not available for common consumers. While the technical means such as RFID radio frequency anti-counterfeiting and engraved intaglio printing anti-counterfeiting have high technical content and are not easy to be breached, however, a large amount of capital investment and technical strength support are often required behind the technologies, and special equipment and professionals are often required for identification, so that the technology is not universal and hinders popularization.
3. An image unit only has one positioning area, perspective distortion cannot be performed when a camera takes a picture, perspective transformation can be performed only by four non-linear positioning points according to the requirement of the perspective transformation, and code scanning precision is not high; b. one image unit comprises a plurality of bits, and the code generation is complex; c. error correction algorithm is not involved, and the anti-interference capability of a single code is low; d. according to the permutation and combination mode of the bits in the code as the coded data, the permutation and combination mode is greatly reduced relative to the data capacity of one bit of each code point, which causes the problems of low data capacity and waste of image code points.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention designs an anti-counterfeiting dot array code generating method and a decoding method, wherein a positioning module and a correction module in the dot array code have no obvious difference compared with a data code group, and are not easy to be identified by human eyes, so that the dot array code has strong concealment, is suitable for an anti-counterfeiting label serving as a product, has low anti-counterfeiting cost and is easy to popularize.
In order to achieve the purpose, the invention adopts the following technical scheme:
the first technical scheme is as follows:
an anti-counterfeiting dot matrix code generating method comprises the following steps:
generating a positioning module and a correction module, wherein the positioning module comprises a code points with continuous centroids on a first straight line, the correction module comprises b code points with continuous centroids on a second straight line, and the slopes of the first straight line and the second straight line are not equal;
acquiring data to be encoded; generating a data module according to data to be encoded, wherein four blank areas are reserved in the data module; and respectively adding three positioning modules and a correction module in the four blank areas to obtain the dot matrix code.
Furthermore, spaces are arranged among all code points in the dot matrix code, and the minimum spaces among the adjacent code points are consistent.
Further, still include: generating a plurality of dot matrix codes and reserving intervals among the dot matrix codes; and randomly generating a plurality of code points in the distance.
Furthermore, three positioning modules in the dot matrix code are distributed in an isosceles right triangle shape.
Furthermore, the side length or the diameter of code points in the dot matrix code is less than or equal to 4 mil.
Furthermore, the data module comprises i code point groups, and the ith code point group comprises ciRow/column code point (c)i<a and ci<b) And a space is left between the adjacent code point groups.
The second technical scheme is as follows:
a decoding method of anti-counterfeiting dot matrix codes comprises the following steps:
acquiring a picture containing a dot matrix code;
identifying all code points in the picture;
searching a positioning module and a correction module in the code points;
according to the positioning module and the correction module, carrying out perspective transformation on the picture;
and decoding the data module in the image after perspective transformation to obtain the data to be encoded.
Further, the identifying all code points in the picture specifically includes:
carrying out graying processing on the image to obtain a grayscale image;
carrying out edge detection on the gray-scale image to obtain edge information of each code point in the image;
and determining the outline of each code point according to the edge information.
Further, the locating module and the correcting module are searched in the code point, and the method specifically comprises the following steps:
determining the centroid of each code point according to the outline of each code point;
find the module meeting the requirement, the requirement is: the centroids of a/b code points on the same straight line, the proportion value of the distance between every two adjacent code points on the straight line is equal to a first numerical value, and the distance value of the adjacent code points is equal to a second numerical value;
according to the slope of the straight line, the modules meeting the requirements are divided into a positioning module and a correction module.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
1. compared with a data code group, the positioning module and the correction module in the dot code have no obvious difference, are not easy to be identified by human eyes, have stronger concealment of the dot code, are suitable for serving as an anti-counterfeiting label of a product, have low anti-counterfeiting cost and are easy to popularize.
2. The invention improves the counterfeiting difficulty by limiting the size of code points to be in the mil level: the counterfeiter can only see the details of the dot code image of the present invention through an image magnifying instrument such as an electron microscope. The dot code image can generate first attenuation in the printing link; the amplified image obtained by shooting through an image amplifying instrument generates second attenuation; zooming the amplified image to make it approach to the original image size and proportion to generate third attenuation; a fourth decay occurs when printing is finally performed. After layer-by-layer attenuation, a large amount of information of the image is lost, and the information such as image detail characteristics and relative positions of the image is not comprehensive. The attenuation cannot be avoided even if high-precision copying equipment is used, so that the anti-counterfeiting effect can be effectively achieved when the code point is designed to be in the mil level.
3. The invention sets the positioning module/the correction module as a/b code points with continuous centroids positioned on the same straight line, and determines the possible module by searching corresponding characteristics (the centroids are positioned on the same straight line, the proportional value of the distance between every two adjacent code points on the straight line is equal to a first numerical value, and the distance value of the adjacent code points is equal to a second numerical value), thereby being not influenced by printing errors, improving the decoding success rate and reducing the requirement on the printing precision.
4. According to the invention, the modules meeting the requirements are divided into the positioning module and the correction module according to the slope of the straight line, so that the horizontal and vertical linear judgment of the cross-shaped positioning module in the A code is avoided, and the positioning speed is accelerated.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of a prior art lattice code;
FIG. 3 is a schematic diagram of a dot matrix code according to the present invention;
FIG. 4 is a schematic diagram of a positioning module and a calibration module according to the present invention;
FIG. 5 is a schematic view of the first and second lines of the present invention;
FIG. 6 is a schematic diagram of a calibration point in a calibration module;
FIG. 7 is a schematic diagram of a positioning module and a calibration module;
FIG. 8 is a schematic diagram of a data module according to the present invention;
FIG. 9 is a schematic diagram of the arrangement of code points of the data module according to the present invention;
FIG. 10 is a schematic diagram of a plurality of dot matrix codes according to the present invention;
fig. 11 is a schematic diagram of adding code points between the lattice codes shown in fig. 10.
Detailed Description
The present invention will be described in more detail with reference to examples.
Example one
As shown in fig. 1, an anti-counterfeiting dot matrix code generating method includes the following steps:
as shown in fig. 4 and 5, a positioning module and a correction module are generated, wherein the positioning module includes three code points whose centroids are located on a first straight line, and the correction module includes three code points whose centroids are located on a second straight line. The slopes of the first straight line and the second straight line are not equal; in this embodiment, the first line makes an angle of 45 ° with the horizontal line, and the second line makes an angle of-45 ° with the horizontal line.
Acquiring data to be encoded; generating a data module (as shown in a block selection in fig. 8) according to data to be encoded, wherein four blank regions are left in the data module; and respectively adding three positioning modules and one correction module in the four blank areas, wherein the three positioning modules are distributed in an isosceles right triangle shape, and thus, the dot matrix code is obtained.
The length or diameter of each code dot in the dot matrix code is in the mil grade, for example, when the printing precision is 800dpi (800dpi indicates that 800 dots can be printed by 1 inch), the code dot is set to be a square, and the length of the side of the square is 2 dots. 1 mil to 0.0254 millimeters (mm), 1 inch to 25.4 mm; the physical size of 1 dot at 800dpi is 1.25mil and the side length of the code dot is 1.25 × 2 to 2.5 mil.
One of the beneficial effects of this embodiment is: the positioning module and the correction module in the dot code are not obviously different from the data code group, are not easily identified by human eyes, and have stronger concealment performance, so that the dot code is suitable for serving as an anti-counterfeit label of a product, has low anti-counterfeit cost and is easy to popularize.
The second advantage of this embodiment is: by limiting the size of the code point to be in the mil level, the counterfeiting difficulty is improved: the counterfeiter can only see the details of the dot code image of the present invention through an image magnifying instrument such as an electron microscope. The dot code image can generate first attenuation in the printing link; the amplified image obtained by shooting through an image amplifying instrument generates second attenuation; zooming the amplified image to make it approach to the original image size and proportion to generate third attenuation; a fourth decay occurs when printing is finally performed. After layer-by-layer attenuation, a large amount of information of the image is lost, and the information such as image detail characteristics and relative positions of the image is not comprehensive. The attenuation cannot be avoided even if high-precision copying equipment is used, so that the anti-counterfeiting effect can be effectively achieved when the dot matrix is designed to be in a mil level.
Example two
The decoding method of the lattice code in the embodiment one comprises the following steps:
acquiring a picture containing a dot matrix code;
identifying all code points in the picture: carrying out graying processing on the image to obtain a grayscale image; carrying out edge detection on the gray-scale image to obtain edge information of each code point in the image; determining the outline of each code point according to the edge information;
searching a positioning module and a correction module in the code points: determining the centroid of each code point according to the outline of each code point; find the module meeting the requirement, the requirement is: three code points with centroids on the same straight line, wherein the proportion value of the distance between every two adjacent code points on the straight line is equal to a first numerical value, and the distance value between every two adjacent code points is equal to a second numerical value; according to the slope of the straight line, the modules meeting the requirements are divided into a positioning module and a correction module. Specifically, as shown in fig. 7, the first value is 1:1 in this embodiment, and the second value is the minimum distance between adjacent code points.
Using the middle code point (i.e. the second code point, as shown in fig. 6) of each positioning module and correction module as the positioning point and correction point, respectively, to obtain four reference points; performing perspective transformation on the picture by using the four reference points;
and decoding the data module in the image after perspective transformation to obtain the data to be encoded.
EXAMPLE III
The dot code shown in fig. 2 is a dot code (hereinafter referred to as a code) generated by the code generation method described in patent "a code generation, decoding method and anti-counterfeiting method of anti-counterfeiting dot code".
Fig. 3 shows a lattice code (hereinafter referred to as B-code for distinction) generated by the method described in this patent.
The code dots in the A code and the B code are both in the size of the Miller scale (the size of the code dot is only one or two pixels). As shown in fig. 2 and 3, in the actual printing process, there is a certain error: if coloring matter (such as toner and ink) discharged from the printer slightly overflows outside the predetermined boundary, the side length of the code point becomes larger and the code point pitch becomes smaller. Due to the undersize code points and the decoding algorithm adopted by the A code (when the length of the code point side is 1:1:1:1: 1:1, the A code point side is determined as a positioning module and a correction module). Such errors cause severe interference in the decoding process and even result in no decoding.
In this embodiment, the positioning module/the calibration module is set to be a/b code points with continuous centroids all located on the same straight line, and the possible module is determined by searching corresponding characteristics (the centroid is on the same straight line, the ratio of the distances between adjacent code points on the straight line is equal to the first numerical value, and the distance between adjacent code points is equal to the second numerical value), so that the method is not affected by printing errors, the decoding success rate is improved, and the requirement on the printing precision is lowered. In addition, the module meeting the requirements is divided into the positioning module and the correction module according to the slope of the straight line, so that the horizontal and vertical linear judgment of the cross positioning module in the A code is avoided, and the positioning speed is accelerated.
Example four
The code point density and the arrangement mode of the positioning module and the correction module in the A code are different from those of the data module, when the A code appears in batches, regularity is easy to see, and the risk of being cracked is increased. In this embodiment, the arrangement of the data module code points in the B code is set as follows:
as shown in fig. 9, the data module includes 5 code point groups, each code point group includes 2 rows of code points and a space is left between adjacent code point groups, specifically: firstly, arranging a positioning module and a correction module; arranging the code points in a staggered manner from top to bottom and from left to right, and reserving a row of blanks after arranging two rows of code points; continuously arranging two rows of code points and reserving a row of blank; and the process is circulated until the code point arrangement is finished. The repeated code point combination with the positioning module and the correction module is avoided, the space is reserved between the code points, the minimum space between the adjacent code points is consistent, and the concealment and the attractiveness are improved.
EXAMPLE five
As shown in fig. 10, four dot-matrix codes are generated with a space left between the dot-matrix codes.
As shown in fig. 11, a plurality of code dots are randomly generated within the space to hide the four dot matrix codes shown.
It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (9)
1. An anti-counterfeiting dot matrix code generating method is characterized by comprising the following steps:
generating a positioning module and a correction module, wherein the positioning module comprises a code points with continuous centroids on a first straight line, the correction module comprises b code points with continuous centroids on a second straight line, and the slopes of the first straight line and the second straight line are not equal;
acquiring data to be encoded; generating a data module according to data to be encoded, wherein four blank areas are reserved in the data module; and respectively adding three positioning modules and a correction module in the four blank areas to obtain the dot matrix code.
2. The method as claimed in claim 1, wherein the dots of the dot matrix code have a uniform minimum spacing therebetween.
3. The anti-counterfeiting dot matrix code generating method according to claim 1, further comprising: generating a plurality of dot matrix codes and reserving intervals among the dot matrix codes; and randomly generating a plurality of code points in the distance.
4. The method for generating anti-counterfeiting dot matrix codes according to claim 1, wherein three positioning modules in the dot matrix codes are distributed in an isosceles right triangle shape.
5. The method for generating anti-counterfeiting dot matrix codes according to claim 1, wherein the side length or the diameter of the code points in the dot matrix codes is less than or equal to 4 mil.
6. The method as claimed in claim 1, wherein the data module comprises i code dot groups, and the ith code dot group comprises ciRow/column code point (c)i<a and ci<b) And a space is left between the adjacent code point groups.
7. The decoding method of the anti-counterfeiting dot matrix code according to claim 1, characterized by comprising the following steps:
acquiring a picture containing a dot matrix code;
identifying all code points in the picture;
searching a positioning module and a correction module in the code points;
according to the positioning module and the correction module, carrying out perspective transformation on the picture;
and decoding the data module in the image after perspective transformation to obtain the data to be encoded.
8. The decoding method of the anti-counterfeiting dot matrix code according to claim 7, wherein the identifying all the code points in the picture specifically comprises:
carrying out graying processing on the image to obtain a grayscale image;
carrying out edge detection on the gray-scale image to obtain edge information of each code point in the image;
and determining the outline of each code point according to the edge information.
9. The method for decoding an anti-counterfeit dot matrix code according to claim 8, wherein the searching for the positioning module and the correction module in the code point comprises:
determining the centroid of each code point according to the outline of each code point;
find the module meeting the requirement, the requirement is: the centroids of a/b code points on the same straight line, the proportion value of the distance between every two adjacent code points on the straight line is equal to a first numerical value, and the distance value of the adjacent code points is equal to a second numerical value;
according to the slope of the straight line, the modules meeting the requirements are divided into a positioning module and a correction module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117291631A (en) * | 2023-10-27 | 2023-12-26 | 广州通赢科技有限公司 | Hidden commodity tracing method and system |
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| CN105760919A (en) * | 2016-02-06 | 2016-07-13 | 深圳市天朗时代科技有限公司 | Dot matrix two-dimensional code coding and recognition method |
| CN106611207A (en) * | 2015-10-23 | 2017-05-03 | 孙东耀 | Two-dimensional code with data writing function and data reading method thereof |
| CN113435556A (en) * | 2021-07-14 | 2021-09-24 | 三维码（厦门）网络科技有限公司 | Code generation and decoding method and anti-counterfeiting method of dot matrix code |
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| US20150090792A1 (en) * | 2013-09-29 | 2015-04-02 | Founder Mobile Media Technology (Beijing) Co., Ltd. | System for decoding two dimensional code and method thereof |
| CN105095936A (en) * | 2015-07-22 | 2015-11-25 | 黄鹤南 | Image two-dimension code based on information hiding, generation method and system thereof |
| CN106611207A (en) * | 2015-10-23 | 2017-05-03 | 孙东耀 | Two-dimensional code with data writing function and data reading method thereof |
| CN105760919A (en) * | 2016-02-06 | 2016-07-13 | 深圳市天朗时代科技有限公司 | Dot matrix two-dimensional code coding and recognition method |
| CN113435556A (en) * | 2021-07-14 | 2021-09-24 | 三维码（厦门）网络科技有限公司 | Code generation and decoding method and anti-counterfeiting method of dot matrix code |
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| CN117291631A (en) * | 2023-10-27 | 2023-12-26 | 广州通赢科技有限公司 | Hidden commodity tracing method and system |
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