CN108334922B - Dot matrix two-dimensional code and encoding and identifying method thereof - Google Patents
Dot matrix two-dimensional code and encoding and identifying method thereof Download PDFInfo
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Abstract
The invention discloses a dot matrix two-dimensional code and a coding and identifying method thereof, wherein a predetermined number of code points are distributed on the dot matrix two-dimensional code; the dot matrix two-dimensional code is provided with at least one code area, the code area comprises at least one data column and at least one positioning column, and the data column and the positioning column are periodically and alternately arranged; calculating a reference point according to a standard positioning point around the data point; calculating the magnitude and direction of a vector from a reference point to a data point; forming coded data according to the magnitude and direction of the vector; and in the identification process, all code points of the code area are segmented, a positioning column and a data column are identified, the size and the direction of a vector from a reference point to the data point are calculated to identify the encoded data, and the corresponding operation of the encoded data is executed. The data column and the positioning column of the invention only need to be basically in a straight line in one direction, more data information can be placed, the coding capacity is large, the invention is suitable for larger optical imaging distortion, the visual interference to human eyes is smaller, and the identification mode is simple and reliable.
Description
Technical Field
The invention relates to the technical field of image identification, in particular to a dot matrix two-dimensional code and a coding and identifying method thereof.
Background
The dot matrix two-dimensional code is an emerging information coding mode in recent years and is commonly used in audio books for children. The dot matrix two-dimensional code has the characteristics of large information carrying capacity, strong concealment, no influence on the visual attractiveness of publications, encryption and anti-counterfeiting functions, can be perfectly combined with paper media, and assists children in performing three-dimensional learning by combining vision and hearing.
In most existing dot matrix two-dimensional code design schemes, during decoding, two directions of a code region need to be obtained by utilizing straight line detection or utilizing variance of each line obtained by radon transformation of a dot matrix. This requires that the dot pattern of the code region is designed in consideration of the fact that the distribution of the viewed dots in the transverse direction and the longitudinal direction is closer to a straight line, which inevitably occupies additional code region space, so that the code region with the same area cannot be provided with more data points.
In the prior art, the X direction and the Y direction are detected through the distribution of code points, wherein the X direction is the direction that a code region is horizontally rightwards after being straightened, and the Y direction is the direction that the code region is vertically downwards after being straightened; in the prior art, code points on an approximate straight line comprise positioning points and data points, the positioning points and the data points are intersected, no columns completely containing the positioning points or the data points exist, and the scheme largely applies interpolation to calculate reference points, so that the distortion resistance is relatively weak.
In addition, for example, the data is expressed by the presence or absence of a point in the national standard established by MPR, and this scheme has problems of high requirement for printing quality and poor appearance in practical use.
Disclosure of Invention
In view of the above problems, the present invention provides a dot matrix two-dimensional code and a method for encoding and identifying the dot matrix two-dimensional code, wherein a data column and a positioning column only need to be substantially in a straight line in one direction, more data information can be placed, the encoding capacity is large, the method is suitable for larger optical imaging distortion, the visual interference to human eyes is small, and the identification method is simple and reliable.
According to one embodiment of the invention, a dot matrix two-dimensional code is provided, wherein a predetermined number of code points are distributed on the dot matrix two-dimensional code;
the dot matrix two-dimensional code is provided with at least one code area, the code area comprises at least one data column and at least one positioning column, and the data column and the positioning column are periodically and alternately arranged;
the positioning columns comprise a standard positioning column, an original point positioning column and a direction positioning column;
the standard positioning column is a point set of code points which are uniformly distributed; the origin positioning column is a point set comprising code points forming a first local dot matrix pattern; the direction positioning column is a point set comprising code points forming a second local lattice pattern;
the code area comprises an original point positioning column and a direction positioning column, wherein a first local dot matrix pattern and/or a second local dot matrix pattern are distributed on the positioning column.
In the dot matrix two-dimensional code, the first local dot matrix pattern appears only in the positioning column; the second local lattice pattern is different from the first local lattice pattern.
Another embodiment of the present invention provides a method for encoding a lattice two-dimensional code, including:
calculating a reference point according to a standard positioning point around the data point, wherein the code point in the data column is defined as the data point, and the code point in the standard positioning column is defined as the standard positioning point;
calculating the magnitude and direction of the vector of the reference point to the data point;
encoded data is formed according to the magnitude and direction of the vector.
In the above method for encoding a dot matrix two-dimensional code, if the data point is surrounded by a plurality of standard positioning points, the intersection point of the diagonal lines of a quadrangle formed by the nearest four standard positioning points adjacent to the data point is used as a reference point;
and if the nearest standard positioning point adjacent to the data point has a deletion, taking the midpoint of a connecting line between the two diagonal standard positioning points as a reference point.
In the above method for encoding a dot matrix two-dimensional code, if the surroundings of the data points are code points forming a first local dot matrix pattern or code points forming a second local dot matrix pattern, the code points forming the first local dot matrix pattern or the code points forming the second local dot matrix pattern are converted into the standard positioning points.
Another embodiment of the present invention provides a method for identifying a dot matrix two-dimensional code, including:
acquiring image data of the dot matrix two-dimensional code, and performing image processing on the image data;
segmenting all code points in the image data;
calculating the position coordinates of the code points, and forming a code point coordinate set by all the position coordinates;
rotating the code point coordinate set within a preset angle range, calculating the collinear feature of the code point coordinate set at each rotation angle, taking the angle corresponding to the maximum collinear feature as the rotation angle of the code point coordinate set, and executing rotation operation on each code point in the code point coordinate set by using the rotation angle;
identifying a data column and a positioning column in the image data, judging the type of the positioning column, and determining the origin and the direction of a code area;
calculating a reference point according to a standard positioning point around each data point in the code region;
and identifying coded data according to the magnitude and the direction of the vector from the reference point to the data point, and executing a preset operation corresponding to the coded data.
In the above identification method of the dot matrix two-dimensional code, if the data point is surrounded by a plurality of standard positioning points, the intersection point of the diagonal line of the quadrangle formed by the nearest four standard positioning points adjacent to the data point is used as a reference point;
and if the nearest standard positioning point adjacent to the data point has a deletion, taking the midpoint of a connecting line between the two diagonal standard positioning points as a reference point.
In the above method for identifying a dot matrix two-dimensional code, if the surroundings of the data points are code points forming a first local dot matrix pattern or code points forming a second local dot matrix pattern, the code points forming the first local dot matrix pattern or the code points forming the second local dot matrix pattern are converted into the standard positioning points.
Another embodiment of the present invention provides an apparatus for recognizing a dot matrix two-dimensional code, including:
the acquisition module is used for acquiring the image data of the dot matrix two-dimensional code and carrying out image processing on the image data;
a segmentation module for segmenting all code points in the image data;
the position coordinate module is used for calculating the position coordinates of the code points and forming a code point coordinate set by all the position coordinates;
the correcting module is used for rotating the code point coordinate set within a preset angle range, calculating the collinear feature of the code point coordinate set at each rotating angle, taking the angle corresponding to the maximum collinear feature as the rotating angle of the code point coordinate set, and executing rotating operation on each code point in the code point coordinate set by using the rotating angle;
the determining module is used for identifying the data column and the positioning column in the image data, judging the type of the positioning column and determining the origin and the direction of a code area;
the calculation module is used for calculating a reference point according to the standard positioning points around each data point in the code area;
and the identification module is used for identifying the coded data according to the magnitude and the direction of the vector from the reference point to the data point and executing a preset operation corresponding to the coded data.
Another embodiment of the present invention provides a computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program runs, the computer-readable storage medium is controlled to make a computer execute the above method for recognizing a dot matrix two-dimensional code.
The encoding and identifying method of the lattice two-dimensional code at least provides the following technical effects: the data column and the positioning column are basically in a straight line in one direction, more data information can be placed, the coding capacity is large, the method is suitable for large optical imaging distortion, the visual interference to human eyes is small, the identification mode is simple and reliable, and the decoding can be successfully performed under the condition that the positioning point is lost.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention.
Fig. 1 shows a schematic structural diagram of a dot matrix two-dimensional code provided by an embodiment of the present invention.
Fig. 2 shows a schematic flow chart of a method for encoding a dot matrix two-dimensional code according to an embodiment of the present invention.
Fig. 3 is a schematic flow chart illustrating a method for identifying a dot matrix two-dimensional code according to an embodiment of the present invention.
Fig. 4 shows a schematic diagram of a distribution mode of code region coordinates provided by an embodiment of the present invention.
Fig. 5 is a schematic structural diagram illustrating an apparatus for recognizing a dot matrix two-dimensional code according to an embodiment of the present invention.
Description of the main element symbols:
10-dot matrix two-dimensional code; a 100-code region; 110-columns of data; 120-positioning columns; 130-a standard anchor point; 140-a first local lattice pattern; 150-a second local lattice pattern; 170-coordinate data; 180-other information; 190-acquiring a target point; 20-a device for identifying the dot matrix two-dimensional code; 210-an acquisition module; 220-a segmentation module; 230-position coordinate module; 240-a rectification module; 250-a determination module; 260-a calculation module; 270 identify the module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Example 1
Fig. 1 shows a schematic structural diagram of a dot matrix two-dimensional code provided by an embodiment of the present invention.
A predetermined number of code points are distributed on the dot matrix two-dimensional code 10. The dot matrix two-dimensional code 10 is provided with at least one code area 100, and the code area 100 comprises at least one data column 110 and at least one positioning column 120. The data columns 110 and the positioning columns 120 are arranged alternately in a cycle.
In this embodiment, the code region 100 includes a dot set of 6 × 6, i.e., 3 data columns and 3 positioning columns alternately arranged in a cycle, and each data column and each positioning column includes 6 code dots. In other embodiments of the present invention, the code region may further include other size point set regions.
In this embodiment, the code point is square. In other embodiments of the present invention, the code point shape may also be circular, etc.
The data column 110 includes N code points, and the code points in the data column 110 are defined as data points, where N is greater than or equal to 0.
The positioning column 120 includes three types: a standard positioning column, an origin positioning column and a direction positioning column.
The standard positioning columns are point sets of code points distributed uniformly, and the code points in the type positioning columns are defined as standard positioning points 130. The origin location column is a set of dots including code dots constituting the first local dot matrix pattern 140, and the first local dot matrix pattern 140 is used to mark the origin of the code region.
In this embodiment, after the code region is aligned, the uppermost code point in the first local dot matrix pattern 140 is defined as an origin point, and the coordinates of the origin point are used as the origin coordinates of the code region where the origin point is located. In other embodiments of the present invention, a virtual point calculated according to a code point in the first local dot matrix pattern 140 may be used as an origin positioning point, and a coordinate of the virtual point may be used as an origin coordinate of the current code area.
In this embodiment, the first local dot matrix pattern 140 is located at the upper left corner of the code region, but in other embodiments of the present invention, the first local dot matrix pattern 140 may also be located at any other position of the code region.
The direction positioning column is a point set including code points constituting a second local dot matrix pattern 150, the second local dot matrix pattern 150 is used to mark the direction of the code area 100, determine the direction of the code area 100 after the code area 100 is aligned, and determine the boundary of the longitudinal Y-axis of the code area 100 if the direction of the code area 100 is upward or downward.
The first local dot matrix pattern 140 appears only in the positioning column, and does not appear in the data column as a point set in the same distribution manner; the second local dot matrix pattern 150 may present a set of dots in the same distribution pattern in the data column; the first partial lattice pattern 140 and the second partial lattice pattern 150 are different. In the present invention, the distribution of the first local dot matrix pattern 140 and the second local dot matrix pattern 150 is not only the arrangement in the present embodiment, but also the arrangement of the code points for marking the origin of the code area and the direction of the X-axis and the Y-axis is within the protection scope of the present invention as long as the arrangement can be distinguished from other code point arrangements.
The code area 100 includes a positioning row 120, the positioning row 120 includes an origin positioning row and a direction positioning row, and the positioning row is distributed with a first local dot matrix pattern 140 and/or a second local dot matrix pattern 150 for indicating the origin and the direction of the code area 100.
A code region 100 has at least one alignment row 120 having a first local dot pattern 140 for identifying the origin of the code region, and similarly, at least one alignment row has a second local dot pattern 150 for identifying the direction of the code region. The first local dot pattern 140 and the second local dot pattern 150 may be distributed in different alignment columns, or may be distributed in the same alignment column. The code dots forming the first local lattice pattern 140 and the code dots forming the second local lattice pattern 150 may be completely distributed in one code region, or may be distributed in two adjacent code regions.
The dot matrix two-dimensional code can be printed on the whole page, and can also be printed in certain designated areas. A plurality of same code areas can be placed in the dot matrix two-dimensional code area corresponding to certain information, the data placed in the same code areas are the same data and point to the same action, an optical scanning device can scan conveniently, the scanning range is expanded, adjacent code areas can be searched conveniently, and the identification accuracy is improved. The dot matrix two-dimensional code corresponding to the blank area can be a meaningless two-dimensional code. The number of data points is determined according to the amount of information contained in the current code region, and when the code region corresponds to a blank region, the number of data points may be 0.
And placing the data points at the positions of the reference points at the boundaries of the dot matrix two-dimensional code areas for marking the boundaries of the dot matrix two-dimensional codes.
In this embodiment, the positioning column width is the same as the data column width. In other embodiments of the present invention, the width of the positioning column may be smaller than the width of the data column to save space in the code area, while considering the aesthetic nature of the printing.
For example, as shown in FIG. 1, a 1 inch is 25.4mm, and assuming 1200 dots per inch of print, each dot is about 21.167 μm, and about 95 dots in a 2mm length range. The following description is given in units of dots, which correspond to one print dot under the condition of 1200 dpi.
As shown in fig. 1, the code region 100 has a size of 90 × 90, a width between each column of dot sets is 15, and includes 6 columns, where the 6 columns of dot sets include 3 columns of data columns and 3 columns of positioning columns, the code region 100 is periodically and alternately arranged in a manner that one column of positioning column is followed by one column of data column, and each column includes 6 code dots representing data. Each standard positioning column is provided with 6 standard positioning points, each standard positioning column is divided into 6 standard positioning point spaces, and the coordinates of the positioning points start from 0. The code region has 3 positioning columns, which are an original positioning column, a standard positioning column and a direction positioning column.
The first local dot matrix pattern at the upper left corner of the code area 100 is used for identifying the origin of the code area, the uppermost code point in the first local dot matrix pattern is an origin locating point, the coordinates of the origin locating point are the origin coordinates of the code area, the rightward direction is the X-axis direction, and the downward direction is the Y-axis direction. Each data point or standard positioning point is distributed in a 15 × 15 area, and the coordinate range of the area is X: 0-14, Y: 0-14.
Fig. 2 shows a schematic flow chart of a method for encoding a dot matrix two-dimensional code according to an embodiment of the present invention.
Step S110, calculating a reference point according to the standard positioning points around the data point.
If the periphery of the data point is provided with a plurality of standard positioning points, the intersection point of the diagonal lines of the quadrangle formed by the four closest standard positioning points adjacent to the data point is used as a reference point.
And if the nearest standard positioning point adjacent to the data point has a deletion, taking the midpoint of a connecting line between the two diagonal standard positioning points as a reference point.
And if the periphery of the data point is a code point for forming a first local lattice pattern or a code point for forming a second local lattice pattern, converting the code point for forming the first local lattice pattern or the code point for forming the second local lattice pattern into the standard positioning point.
For example, as shown in fig. 1, four code points closer to each other in the first local dot matrix pattern 140 in the original point positioning column may be removed from the middle two code points, and a new code point is obtained by interpolation and inserted into the original point positioning column as a missing positioning point, so that the positioning points in the positioning column are uniformly distributed at equal intervals; two code points in the second local dot matrix pattern 150 in the direction positioning column can be shifted down to the middle point between the first code point in the second local dot matrix pattern 150 and the third code point in the direction positioning column, so as to ensure that the periphery of each data point is a standard positioning point, and the position coordinates of the reference point can be acquired accurately.
Step S120, calculating the magnitude and direction of the vector from the reference point to the data point.
After the coordinates of the reference point are acquired, the magnitude and direction of the vector between the reference point and the data point are calculated according to the coordinates of the reference point and the coordinates of the data point.
In this embodiment, the coordinates of the code point may be represented by coordinates of the center of gravity of the code point, and the size and the direction of the vector may be represented by coordinates of the vector and the size of the included angle α.
Step S130, forming coded data according to the size and the direction of the vector.
Forming different coded data according to the difference of the magnitude and the direction of each vector calculated in step S120, where the coded data may correspond to a mapping numerical value or a coordinate, the mapping numerical value or the XY coordinate corresponds to different preset operations, and the optical scanning device stores in advance a corresponding relationship between the mapping numerical value or the XY coordinate and the executed operation and specific contents of the operation. The mapping numerical value can be a number, a character and the like, and the optical scanning device can be a writing pen, a touch and talk pen and the like.
As shown in FIG. 1, the uppermost point in the first local dot matrix pattern at the upper left corner of the region is used as the origin locating point of the code region, and the right direction is the X-axis direction and the downward direction is the Y-axis direction. Each data point or standard positioning point is distributed in a 15 × 15 area, and the coordinate range of the area is X: 0-14, Y: 0-14. And (4) calculating the coordinates of the reference point of the region, namely the position of the midpoint O of a quadrangle formed by the four standard positioning points of the region, wherein the coordinates are (7, 7).
In this embodiment, the data points in the region are distributed on a square region, and the midpoint of the square is point O. In other embodiments of the present invention, the distribution of the data points is not limited to this, and may be in other distribution manners, which is convenient for distinguishing and increases the aesthetic property of the printing.
In fig. 1, all possible distribution positions of data points are eight positions (5,5), (5,7), (5,9), (7,5), (7,9), (9,5), (9,7) and (9, 9). If the eight possible distribution positions of the data point are represented by decimal values 0-7, respectively, the decimal data may be 3-bit binary data, i.e., each data point may represent 3-bit binary data. In this embodiment, the entire code region 1 has 18 data points, and can represent 54-bit data.
In this embodiment, the code area 100 can store two types of data, one is a mapping value, and the other is an XY coordinate and a page number. Other types of data formats are possible in other embodiments of the invention.
The corresponding relationship between the mapping value and the action can be a corresponding relationship table or a formula function, etc. As shown in the following table, the mapping values and the operations are corresponding.
| Mapping values | Operation of |
| 110011011 | Playing specified characters |
| 001110011 | Playing specified animation |
| …… | …… |
| 111101001 | Playing designated speech |
When the mapping numerical value is "110011011", the operation executed is "playing the specified animation", and the animation content is stored in the optical scanning device in advance; when the mapped data value is "111101001", the operation performed by it is "play designated voice", the voice content being stored in advance in the optical scanning apparatus.
In this embodiment, when the encoded data is a mapping value, 36 bits are selected to store the mapping value, which may represent 0-236 -1The remaining 18 bits are used to place the checksum error correction bits. In other embodiments of the invention, 42-bit projection values can be selected, other 12-bit check sum error correction bits can be placed, all 54-bit mapping values can be placed, check sum error correction bits are not placed, and the setting can be customized according to user requirements. In the embodiment, the checksum error correction algorithm is a Reed-Solomon algorithm, and in other embodiments of the invention, other types of checksum error correction algorithms can be selected.
Fig. 3 is a schematic flow chart illustrating a method for identifying a dot matrix two-dimensional code according to an embodiment of the present invention.
And step S210, acquiring image data of the dot matrix two-dimensional code, and performing image processing on the image data.
The image data of the dot matrix two-dimensional code is collected through a camera in the optical scanning device and is processed for facilitating subsequent image segmentation. The image processing may be image filtering, enhancing, or the like.
Step S220, all code points in the image data are segmented.
And segmenting all code points in the image data by using an image segmentation algorithm. The image segmentation algorithm may be a threshold-based segmentation method, a region-based segmentation method, an edge-based segmentation method, or the like.
Step S230, calculating the position coordinates of the code points, and forming a code point coordinate set from all the position coordinates.
In this embodiment, the position coordinates of all the divided code points are calculated, and the position coordinates of all the code points are combined into one code point coordinate set.
Step S240, rotating the code point coordinate set within a preset angle range, calculating a collinear feature of the code point coordinate set at each rotation angle, taking an angle corresponding to the largest collinear feature as a rotation angle of the code point coordinate set, and performing a rotation operation on each code point in the code point coordinate set by using the rotation angle.
In the scheme, the positioning column and the data column are only in a straight line in one direction, after the collected code area image is aligned, after the data point or the positioning point of the code area is removed, the rest code points are in a substantially straight line state in the X-axis direction of the code area.
In this embodiment, the code point coordinate sets are rotated within an angle range of 0 ° to 180 °, assuming that the X-axis range is 0-200 and the initial value is 0, at the position of each rotation angle, each code point coordinate set is projected to the X-axis, the projection result falls on a certain value within an interval of 0-200, and the value is added by 1 to obtain a set of one-dimensional data. And calculating collinear features of the projection data of each angle, wherein the collinear features can be the variances of the one-dimensional data, sequencing the variances of all the obtained one-dimensional data, taking the angle corresponding to the one-dimensional data with the largest collinear features, namely the variance as a rotation angle, and performing rotation operation on each point in the code point coordinate set according to the rotation angle so as to enable the positioning column to be in the vertical direction basically.
In other embodiments of the present invention, the rotation angle of the code point coordinate set may be calculated in other manners, so that the code region is in a correct state after the rotation is performed according to the rotation angle. In this embodiment, the righting state is that coordinates of an uppermost origin positioning point in the first local dot matrix pattern in the code region are used as coordinates of an origin of the code region, a rightward direction is an X axis, and a downward direction is a Y axis. In other embodiments of the present invention, other origin positions and XY-axis directions may be set in the code region as a correction state.
Step S250, identifying the data column and the positioning column in the image data, judging the type of the positioning column, and determining the origin and the direction of the code area.
In this case, the exact direction of the X-axis may be determined from a combination of the first local lattice pattern and the second local lattice pattern. In other embodiments of the invention, other modes of calculation may also be used.
Merging all the code points after being aligned according to the size sequence of Y coordinates, dividing the positioning column and the data column into one row, identifying the attribute of each row, judging the type of the positioning column, distinguishing a standard positioning column, an original point positioning column and a direction positioning column, and determining the original point and the XY direction containing the code area in the image data according to a first local dot matrix pattern in the original point positioning column and a second local dot matrix pattern in the direction positioning column.
Step S260, calculating a reference point according to the standard positioning point around each data point in the code region.
In this embodiment, the code points in the original point positioning column and the code points in the direction positioning column in the code region are processed, the original point positioning column and the direction positioning column are converted into the standard positioning column, and the decoding unit is determined. The structure of each decoding unit is composed of 4 standard positioning points and a data point, and the connecting lines among the four standard positioning points can form an approximate parallelogram.
In other embodiments of the present invention, after the decoding unit is determined, the origin positioning point and the direction positioning point in the decoding unit may be processed to be converted into the standard positioning point.
If the periphery of the data point is provided with a plurality of standard positioning points, the intersection point of the diagonal lines of the quadrangle formed by the four closest standard positioning points adjacent to the data point is used as a reference point.
And if the nearest standard positioning point adjacent to the data point has a deletion, taking the midpoint of a connecting line between the two diagonal standard positioning points as a reference point.
Step S270, identifying the encoded data according to the magnitude and direction of the vector from the reference point to the data point, and performing a preset operation corresponding to the encoded data.
And identifying the data stored in the data points according to the magnitude and the direction of the vector between the reference point and the data points, and checking to obtain an identification result. The optical scanning device stores the corresponding relation between the coded data and the preset operation and the content contained in the operation in advance, and executes the action corresponding to the identification result according to the corresponding relation between the pre-stored coded data and the preset operation.
The encoded data is a mapped value or XY coordinates, where XY coordinates are the coordinates of the code region in units of length and width of a code region.
When the decoded data is a mapping numerical value, the same mapping numerical value is placed in the plurality of same code areas, and when the same mapping numerical value is identified, the corresponding operation is executed according to the pre-stored corresponding relation by taking the same mapping numerical value as an index value.
When the code region data points store XY coordinates, the placement of the XY coordinates is shown in FIG. 4.
In this embodiment, the data portion 170 is used to place XY coordinates of the origin of the code region, and the XY coordinates occupy 4 data points respectively, and can encode 12-bit data. The distribution mode of XY coordinates in the horizontal direction is the same; in the vertical direction, if the current code region encodes the X coordinate first, the adjacent code region (upper code region or lower code region) encodes the Y coordinate first. The auxiliary data part 180 is used for placing other information, wherein the auxiliary data part 180 has a point placing auxiliary information for indicating the encoding mode of the current code area XY coordinate, namely, the X coordinate or the Y coordinate is encoded first from top to bottom, and other points are used for placing other information, such information is the same on the whole dot matrix two-dimensional code or is the same in a local range of a certain area, so that the decoding process can utilize periodic complementary data. The collection target point 190 is a center position of a camera in the optical scanning device, generally a center of an image, and the coordinates of the optical scanning device are calculated by using XY coordinates of a code area where the collection target point is located through a relative position relationship between the collection target point and an origin of the code area where the collection target point is located. The optical scanning device may be a stylus pen or a touch and talk pen.
In other embodiments of the present invention, other types of coordinate distribution are possible.
When the XY coordinates are recognized, the current position is calculated in which decoding unit of which code region according to the coordinates of the acquisition target point 190. The distribution mode of the XY coordinates of the code region where the acquisition target point 190 is located is determined according to the auxiliary information in the auxiliary data part 180, and the complete sub-decoding region closest to the acquisition target point 190 is found. The complete sub-decoding region is a decoding region capable of decoding the XY coordinates of the code region where the acquisition target point 190 is located. In this embodiment, the distance from the complete sub-decoding region to the acquisition target point 190 does not exceed 2mm, and in other embodiments of the present invention, the acquisition range may be expanded by upgrading the optical scanning device or improving the robustness of the algorithm.
When the decoded data are XY coordinates, the XY coordinates of the adjacent code regions can be used to calculate the XY coordinates of the current code region, for example, the XY coordinates of the adjacent code regions are both increased by 1 or decreased by 1; the adjacent X coordinates are unchanged, and the Y coordinate is increased by 1 or decreased by 1; adjacent X coordinates are increased by 1 or decreased by 1, Y coordinates are unchanged, etc.
And determining the XY coordinates of the code area where the acquisition target point 190 is located according to the decoded XY coordinates, and obtaining the accurate coordinates of the current acquisition target point 190 by combining the relative position relation of the acquisition target point 190 in the code area.
Fig. 5 is a schematic structural diagram illustrating an apparatus for recognizing a dot matrix two-dimensional code according to an embodiment of the present invention.
The device 20 for identifying a dot matrix two-dimensional code includes: an acquisition module 210, a segmentation module 220, a position coordinates module 230, a rectification module 240, a determination module 250, a calculation module 260, and a recognition module 270.
The acquisition module 210 is configured to acquire image data of the dot matrix two-dimensional code and perform image processing on the image data.
A segmentation module 220, configured to segment all code points in the image data.
And a position coordinate module 230, configured to calculate position coordinates of the code points, and form a code point coordinate set with all the position coordinates.
And a correcting module 240, configured to rotate the code point coordinate set within a preset angle range, calculate a collinear feature of the code point coordinate set at each rotation angle, use an angle corresponding to the largest collinear feature as a rotation angle of the code point coordinate set, and perform a rotation operation on each code point in the code point coordinate set by using the rotation angle.
The determining module 250 is configured to identify a data column and a positioning column in the image data, determine a type of the positioning column, and determine an origin and a direction of a code region.
And the calculating module 260 is configured to calculate a reference point according to the standard positioning point around each data point in the code region.
And the identifying module 270 is configured to identify the encoded data according to the magnitude and the direction of the vector from the reference point to the data point, and perform a preset operation corresponding to the encoded data.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part of the technical solution that contributes to the prior art in essence can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (9)
1. A dot matrix two-dimensional code is characterized in that a predetermined number of code points are distributed on the dot matrix two-dimensional code;
the dot matrix two-dimensional code is provided with at least one code area, the code area comprises at least one data column and at least one positioning column, and the data column and the positioning column are periodically and alternately arranged;
the positioning columns comprise a standard positioning column, an original point positioning column and a direction positioning column;
the standard positioning column is a point set of code points which are uniformly distributed; the origin positioning column is a point set comprising code points forming a first local dot matrix pattern; the direction positioning column is a point set comprising code points forming a second local lattice pattern;
the code area comprises an original point positioning column and a direction positioning column, wherein a first local dot matrix pattern and/or a second local dot matrix pattern are distributed on the positioning column; the first local dot matrix pattern is used for marking the original point of the code area, and the second local dot matrix pattern is used for marking the direction of the code area; the first local dot matrix pattern appears only in the positioning column; the second local lattice pattern is different from the first local lattice pattern.
2. A dot matrix two-dimensional code encoding method, applied to the dot matrix two-dimensional code of claim 1, comprising:
calculating a reference point according to a standard positioning point around the data point, wherein the code point in the data column is defined as the data point, and the code point in the standard positioning column is defined as the standard positioning point;
calculating the magnitude and direction of the vector of the reference point to the data point;
encoded data is formed according to the magnitude and direction of the vector.
3. The encoding method of lattice two-dimensional code as claimed in claim 2, wherein said "calculating reference points according to standard anchor points around data points" comprises:
if the periphery of the data point is provided with a plurality of standard positioning points, taking the intersection point of the diagonal lines of the quadrangle formed by the four closest standard positioning points adjacent to the data point as a reference point;
and if the nearest standard positioning point adjacent to the data point has a deletion, taking the midpoint of a connecting line between the two diagonal standard positioning points as a reference point.
4. The encoding method of dot matrix two-dimensional code according to claim 3,
and if the periphery of the data point is a code point for forming a first local lattice pattern or a code point for forming a second local lattice pattern, converting the code point for forming the first local lattice pattern or the code point for forming the second local lattice pattern into the standard positioning point.
5. A dot matrix two-dimensional code recognition method applied to the dot matrix two-dimensional code according to claim 1, the recognition method comprising:
acquiring image data of the dot matrix two-dimensional code, and performing image processing on the image data;
segmenting all code points in the image data;
calculating the position coordinates of the code points, and forming a code point coordinate set by all the position coordinates;
rotating the code point coordinate set within a preset angle range, calculating the collinear feature of the code point coordinate set at each rotation angle, taking the angle corresponding to the maximum collinear feature as the rotation angle of the code point coordinate set, and executing rotation operation on each code point in the code point coordinate set by using the rotation angle;
identifying a data column and a positioning column in the image data, judging the type of the positioning column, and determining the origin and the direction of a code area;
calculating a reference point according to a standard positioning point around each data point in the code region;
and identifying coded data according to the magnitude and the direction of the vector from the reference point to the data point, and executing a preset operation corresponding to the coded data.
6. The method for identifying dot matrix two-dimensional codes according to claim 5, wherein said "calculating reference points according to standard positioning points around each data point in the code region" comprises:
if the periphery of the data point is provided with a plurality of standard positioning points, taking the intersection point of the diagonal lines of the quadrangle formed by the four closest standard positioning points adjacent to the data point as a reference point;
and if the nearest standard positioning point adjacent to the data point has a deletion, taking the midpoint of a connecting line between the two diagonal standard positioning points as a reference point.
7. The dot matrix two-dimensional code identification method according to claim 6, wherein if the data points are surrounded by code points forming a first local dot matrix pattern or code points forming a second local dot matrix pattern, the code points forming the first local dot matrix pattern or the code points forming the second local dot matrix pattern are converted into the standard positioning points.
8. The utility model provides an identification device of dot matrix two-dimensional code which characterized in that includes:
the acquisition module is used for acquiring the image data of the dot matrix two-dimensional code of claim 1 and carrying out image processing on the image data;
a segmentation module for segmenting all code points in the image data;
the position coordinate module is used for calculating the position coordinates of the code points and forming a code point coordinate set by all the position coordinates;
the correcting module is used for rotating the code point coordinate set within a preset angle range, calculating the collinear feature of the code point coordinate set at each rotating angle, taking the angle corresponding to the maximum collinear feature as the rotating angle of the code point coordinate set, and executing rotating operation on each code point in the code point coordinate set by using the rotating angle;
the determining module is used for identifying the data column and the positioning column in the image data, judging the type of the positioning column and determining the origin and the direction of a code area;
the calculation module is used for calculating a reference point according to the standard positioning points around each data point in the code area;
and the identification module is used for identifying the coded data according to the magnitude and the direction of the vector from the reference point to the data point and executing a preset operation corresponding to the coded data.
9. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed, the computer-readable storage medium controls a computer to execute the identification method of a dot matrix two-dimensional code according to any one of claims 5 to 7.
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| CN110487283B (en) * | 2019-09-17 | 2023-04-11 | 国微集团(深圳)有限公司 | Recognizable code point block and navigation method and system based on code point block |
| CN111428534B (en) * | 2020-04-15 | 2023-10-27 | 佛山市玖章智能科技有限公司 | Decryption identification method based on dot matrix hidden writing information coding |
| CN111583349A (en) * | 2020-05-15 | 2020-08-25 | 上海普正信息科技有限公司 | Method and system for restoring coded information by original handwriting |
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