CN108960000A - A kind of strip small two-dimension code recognition methods - Google Patents
A kind of strip small two-dimension code recognition methods Download PDFInfo
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- CN108960000A CN108960000A CN201810786134.9A CN201810786134A CN108960000A CN 108960000 A CN108960000 A CN 108960000A CN 201810786134 A CN201810786134 A CN 201810786134A CN 108960000 A CN108960000 A CN 108960000A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- 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
- G06K7/1439—Methods for optical code recognition including a method step for retrieval of the optical code
- G06K7/1443—Methods for optical code recognition including a method step for retrieval of the optical code locating of the code in an image
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- 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
- G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
- G06K7/1417—2D bar codes
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Abstract
The invention discloses a kind of strip small two-dimension code recognition methods, which comprises after image in 2 D code is carried out gray processing and binaryzation pretreatment, then carries out median filter processing；Horizontal and vertical scanning distinguished to treated image in 2 D code, the intersection point of lateral segment and longitudinal segment is the center of positioning pattern and scans and arrive anchor point；It is acquired according to the anchor point scanned from standard two-dimensional code coordinate to the perspective transform image coordinate；All code element informations are obtained according to the relationship of perspective transform, even-odd check is carried out to code element information, carry out mask, the data encoded originally with the mask method recorded in mask row further according to examining.The present invention quickly identifies information entrained by the two dimensional code by scanning the two-dimensional code, few suitable for information content, limited space, the scene for needing while identifying there are multiple two dimensional codes in image.
Description
Technical field
The present invention relates to planar bar code technology field more particularly to a kind of strip small two-dimension code recognition methods.
Background technique
Two dimensional code is the machine readable pattern of encoded information on two dimensions, QR two dimensional code (Quick Response,
Matrix two-dimensional code sign) it is now most widely used two dimensional code, have information capacity big, the strong advantage of error correcting capability, still,
QR two dimensional code is all square, and the smallest QR two dimensional code also has 21 symbol x21 symbols, big for some image in 2 D code
Small limited scene, the area that can be occupied due to each code element is too small so that camera is difficult to differentiate, such as shared at one
The case where two dimensional code for representing each self-information is all posted for camera scanning in all books sides in bookcase, such two dimensional code
It is not available；In addition, QR two dimensional code exists in the scene that two dimensional code intensively occurs and needs while identifying all two dimensional codes
When identification, since there are three positioning patterns for each two dimensional code, needs to match all positioning patterns detected of combination, will belong to same
The positioning pattern of one two dimensional code is grouped together, the step be for intensive two dimensional code it is relatively difficult, will increase
Recognition time and reduction discrimination.
Therefore, the existing technology needs to be improved and developed.
Summary of the invention
The technical problem to be solved in the present invention is that the present invention provides a kind of strip small-sized two for prior art defect
Tie up code recognition methods, it is intended to information entrained by the two dimensional code is quickly identified by scanning the two-dimensional code, it is few suitable for information content,
Limited space, there are the scenes that multiple two dimensional codes need to identify simultaneously in image.
The technical proposal for solving the technical problem of the invention is as follows:
A kind of strip small two-dimension code recognition methods, wherein the strip small two-dimension code recognition methods includes:
After image in 2 D code is carried out gray processing and binaryzation pretreatment, then carry out median filter processing；
Horizontal and vertical scanning distinguished to treated image in 2 D code, the intersection point of lateral segment and longitudinal segment is positioning pattern
Center and scan arrive anchor point；
It is acquired according to the anchor point scanned from standard two-dimensional code coordinate to the perspective transform image coordinate；
All code element informations are obtained according to the relationship of perspective transform, even-odd check is carried out to code element information, further according to inspection and is covered
The mask method recorded in code row carries out mask, the data encoded originally.
The strip small two-dimension code recognition methods, wherein the two dimensional code is lateral longitudinal 17 symbols of 5 symbol *
Rectangle two dimensional code, the two dimensional code are made of 5 column symbols from left to right and 17 row symbols from top to bottom.
The strip small two-dimension code recognition methods, wherein the 1st row to the 4th row and the 14th row to the 17th behavior number
According to code line, the information that indicates different for carrying out data encoding；
5th V&V of behavior and mask row, for carrying out data parity check and mask；
Blank line is arranged in 6th row and the 12nd row；
The figure that 7th row to the 11st row forms is positioning pattern, for positioning to two dimensional code；13rd behavior bottom row is used
In the direction for determining two dimensional code.
The strip small two-dimension code recognition methods, wherein the verification and mask row three symbols in centre with it is described
At least there are two color differences for the rectangular cells of three symbols among the next row.
The strip small two-dimension code recognition methods, wherein each code element is indicated by a rectangular cells, institute
There are rectangular cells to be marked by two kinds of colors of black and white, black symbol representative 1, white symbol represents 0.
The strip small two-dimension code recognition methods, wherein the shape of the positioning pattern immobilizes, the positioning
The shape of figure is " returning " font.
The strip small two-dimension code recognition methods, wherein when the positioning pattern scanned the two-dimensional code, scheme by positioning
The line at shape center is divided into black five part of black and white black and white, ratio 1:1:1:1:1 by positioning pattern；To treated, image is horizontal respectively
To and longitudinal scanning, the intersection point of lateral segment and longitudinal segment is the center of positioning pattern.
The strip small two-dimension code recognition methods, wherein when Scan orientation point, each positioning pattern is swept
It retouches and determines four anchor points a, b, c, d；The horizontal scan line and positioning pattern outer layer black silhouette line for crossing positioning pattern center are handed over
In l, r two o'clock is scanned up using l as starting point along positioning pattern black outer edge, calculates each point and positioning in scanning process
The distance of centre of figure, is anchor point a apart from maximum point, other anchor points b, c, d analogize scanning and obtain.
The strip small two-dimension code recognition methods, wherein described to be acquired according to the anchor point scanned from standard two
Dimension code coordinate is specifically included to the perspective transform between image coordinate:
The coordinate of the corresponding points of anchor point a, b, c, d in standard two-dimensional code includes: the first for (0,6), (5,6),
(5,11), (0,11);Second is (5,6), (5,11), (0,11), (0,6);The third is (5,11), (0,
11), (0,6), (5,6);4th kind is (0,11), (0,6), (5,6), (5,11)；
To every kind of situation, it is known that a in image, b, the coordinate of 4 coordinates of c, d and corresponding points in standard two-dimensional code are acquired from mark
Quasi- two dimensional code coordinate is to the perspective transform between image coordinate.
The strip small two-dimension code recognition methods, wherein the relationship according to perspective transform obtains all symbols
Information carries out even-odd check to code element information, carries out mask with the mask method recorded in mask row further according to examining, obtains original
Data to encode specifically include:
Transformation relation is obtained according to perspective transform, calculates data encoding row and verification and position of the mask row in image in 2 D code
It sets, obtains all code element informations；
Even-odd check is carried out to obtained code element information, is then covered according to inspection with the mask method recorded in mask row
Code, the data encoded originally.
The invention discloses a kind of strip small two-dimension code recognition methods, which comprises carries out image in 2 D code
After gray processing and binaryzation pretreatment, then carry out median filter processing；To treated, image in 2 D code difference is horizontal and vertical
The intersection point of scanning, lateral segment and longitudinal segment is the center of positioning pattern and anchor point is arrived in scanning；According to the positioning scanned
Point is acquired from standard two-dimensional code coordinate to the perspective transform image coordinate；All symbols are obtained according to the relationship of perspective transform
Information carries out even-odd check to code element information, carries out mask with the mask method recorded in mask row further according to examining, obtains original
Come the data encoded.The present invention quickly identifies information entrained by the two dimensional code by scanning the two-dimensional code, and is suitable for information content
Lack, limited space, the scene for needing while identifying there are multiple two dimensional codes in image.
Detailed description of the invention
Fig. 1 is the flow chart of the preferred embodiment of strip small two-dimension code recognition methods of the present invention；
Fig. 2 is the structural schematic diagram of two dimensional code in the preferred embodiment of strip small two-dimension code recognition methods of the present invention；
Fig. 3 is the schematic diagram of Scan orientation figure in the preferred embodiment of strip small two-dimension code recognition methods of the present invention；
Fig. 4 is the schematic diagram of Scan orientation point in the preferred embodiment of strip small two-dimension code recognition methods of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, right as follows in conjunction with drawings and embodiments
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
It is of the invention in limiting.
Strip small two-dimension code recognition methods described in present pre-ferred embodiments, as shown in Figure 1, a kind of strip small-sized two
Tie up code recognition methods, wherein the strip small two-dimension code recognition methods the following steps are included:
Step S10, after image in 2 D code being carried out gray processing and binaryzation pretreatment, then median filter processing is carried out；
Step S20, to treated, image in 2 D code distinguishes horizontal and vertical scanning, and the intersection point of lateral segment and longitudinal segment is
It simultaneously scans to anchor point at the center of positioning pattern；
Step S30, it is acquired according to the anchor point scanned from standard two-dimensional code coordinate to the perspective transform image coordinate；
Step S40, all code element informations are obtained according to the relationship of perspective transform, even-odd check is carried out to code element information, further according to
It examines and carries out mask, the data encoded originally with the mask method recorded in mask row.
Specifically, as shown in Fig. 2, the two dimensional code is the rectangle two dimensional code of laterally longitudinal 17 symbols of 5 symbol *, described two
Tie up code by 5 column symbols from left to right and from top to bottom 17 row symbols (symbol is the smallest rectangular cells in pattern in 2 D code,
Two dimensional code size in Fig. 2 is 5 symbol x17 symbols, is laterally having 5 symbols, longitudinal by 17 symbols) it forms.
1st row to the 4th row and the 14th row to the 17th row, which is provided for progress data encoding, indicates different information
Data encoding row；5th row is provided for carry out verification and the mask row of data parity check and mask；By the 6th row and
12 rows are set as blank line；The positioning pattern for being used to position two dimensional code is arranged in the figure that 7th row to the 11st row forms；
13rd row is provided for determine the next row in the direction of two dimensional code.
Wherein, each symbol indicates that the shape of each rectangular cells is that size is identical using a rectangular cells
Square, all rectangular cells are marked by two kinds of colors of black and white, and black symbol representative 1, white symbol represents 0.
Specifically, the 1st row can indicate the data of 40bit to the 4th row and the 14th row to the 17th behavioral data code line.
Wherein, the 5th row is verification and mask row, is used for data parity check and mask, mask is changed according to certain way
The color of time-varying code member, in verification with mask row, intermediate three symbols indicate the mask mode used, and the purpose of mask is to make two
It is balanced to tie up code pattern black and white, machine recognition of being more convenient for.
Specifically, only one positioning pattern in each two dimensional code of the invention, the i.e. figure that the 7th row is formed to the 11st row
The shape of shape, the positioning pattern immobilizes, and shape is " returning " font, and positioning pattern is two dimensional code center in Fig. 2
" returning " herringbone pattern, when scanning the two-dimensional code, is by scanning this positioning pattern come fixation and recognition two for positioning two dimensional code
Tie up code.
Specifically, cross " returning " shape central point it is wired can all be divided into five isometric chequered with black and white parts, in this way,
In scanning, the state (such as rotation angle) regardless of two dimensional code, " going back to " font center is arrived in horizontal line scanning, can all be obtained isometric
Chequered with black and white five section, put even if two dimensional code is not vertical 90 degree in use and (such as be attached to the side of books
For identifying books), effect above can also be got to, it can very easily identified.
Wherein, it is black to be fixed as black and white black and white for the color of five rectangular cells of the next row, for demarcating two dimensional code side
Position and reduction are accidentally known, the next line position second row below positioning pattern, after scanning to positioning pattern, are determined by the next row of scanning
The direction of two dimensional code.
Further, in the verification with mask row, intermediate three symbols indicate the mask method used；The bottom
It is black that the color of five capable rectangular cells is fixed as black and white black and white, the verification and mask row (the 5th row) and the next row (the
13 rows) in corresponding position the white black and white of code 010(of centre three) member at least two code elements are different (when identification, needs by the
13 rows, i.e., the next row differentiate direction, therefore, to assure that it and symmetrical 5th row is different therewith), then a total of 4 kinds of mask sides
Method, respectively 001,100,101 and 111.
Wherein, the mask mode that 001 mask mode is (row+col) mod 2=0,100 is (row+col) mod 3
The mask mode that=0,101 mask mode is col mod 2=0,111 is (row/2+col/2) mod 2=0；Wherein,
Row indicates the line number of symbol, and col indicates the row number of symbol, and mod expression takes the remainder；It is operated according to mask in data code line
The symbol for meeting mask mode sets anti-(blacking is white, and leucismus is black), and the symbol for not meeting mask mode is constant.
With mask row, the symbol positioned at the 1st column does even parity check to the 14th row to the 17th row for the verification, is located at the 5th column
Symbol even parity check is done to the 1st row to the 5th row, generating 4 two dimensional codes (is exactly the symbol for verifying first symbol Yu last four row
In, black he number is even number, and in 1-5 row, black symbol sum is even number).
Specifically, image preprocessing: image gray processing first, then Niblack algorithm binaryzation is used, intermediate value is carried out later
Filtering.As shown in figure 3, when the positioning pattern scanned the two-dimensional code, it is divided by the line at positioning pattern center by positioning pattern black
White black five part of black and white, ratio 1:1:1:1:1；Horizontal and vertical scanning distinguished to treated image, lateral segment and vertical
It is the center of positioning pattern to the intersection point of segment.
As shown in figure 4, being scanned to each positioning pattern when Scan orientation point and determining four anchor points a, b, c, d；
The method for looking for anchor point a is as follows: the horizontal scan line and positioning pattern outer layer black silhouette line for crossing positioning pattern center meet at l, r
Two o'clock is scanned up using l as starting point along positioning pattern black outer edge, calculates each point and positioning pattern in scanning process
The distance at center, is anchor point a apart from maximum point, other anchor points b, c, d analogize scanning and obtain.
It is possible that there are four types of the coordinates of the corresponding points of its midpoint a, b, c, d in standard two-dimensional code, the first is (0,6),
(5,6), (5,11), (0,11)；Second is (5,6), (5,11), (0,11), (0,6)；The third is (5,11),
(0,11), (0,6), (5,6)；4th kind is (0,11), (0,6), (5,6), (5,11)；To every kind of situation, due to
The coordinate of a in cicada image, b, 4 coordinates of c, d and their corresponding points in standard two-dimensional code, can be in the hope of from standard two
Code coordinate is tieed up to the perspective transform between image coordinate, standard two-dimensional code bottom row symbol is found out in the picture by this transformation
Position shows to be consistent with the next row, this situation is correct if the code element information of the position is that black and white black and white is black.
According to the transformation relation found out, 8 data code lines, verification and the position of mask row in the picture are calculated, is obtained
All code element informations carry out even-odd check to obtained code element information, are then carried out according to the mask method recorded in mask row
Mask has thus obtained the data of original coding.
Two dimensional code design of the invention is mainly used in scene (such as the more figures in shared bookcase of two dimensional code limited size
The two-dimension code label of book, camera need while scanning the situation of multiple two dimensional codes), only one positioning figure of each two dimensional code
Shape had both saved valuable space in limited size, in scanning there are when the image of multiple two dimensional codes, and multiple fixed
Bit pattern bring combines the burden of the positioning pattern of same two dimensional code；It is positioned using four anchor points of positioning pattern,
The perspective transform between standard two-dimensional code coordinate and scan image coordinate is calculated, so that can only be positioned with a positioning pattern
Two dimensional code in scan image；Two dimensional code width and positioning pattern are of same size, and the next row is fixed, and with odd even and mask row
At least two code elements are different, it is possible thereby to distinguish the up and down direction of two dimensional code, data encoding row is symmetrically distributed in the next row
The top of lower section and odd even and mask row.
In conclusion the present invention provides a kind of strip small two-dimension code recognition methods, which comprises by two dimensional code figure
After carrying out gray processing and binaryzation pretreatment, then carry out median filter processing；To treated, image in 2 D code is lateral respectively
And longitudinal scanning, the intersection point of lateral segment and longitudinal segment are the center of positioning pattern and scan and arrive anchor point；It is arrived according to scanning
Anchor point acquire from standard two-dimensional code coordinate to the perspective transform image coordinate；Institute is obtained according to the relationship of perspective transform
There is code element information, even-odd check carried out to code element information, carries out mask with the mask method recorded in mask row further according to examining,
Originally the data encoded.The present invention quickly identifies information entrained by the two dimensional code by scanning the two-dimensional code, and is suitable for
Information content is few, limited space, the scene for needing while identifying there are multiple two dimensional codes in image.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention
Protect range.
Claims (10)
1. a kind of strip small two-dimension code recognition methods, which is characterized in that the strip small two-dimension code recognition methods includes:
After image in 2 D code is carried out gray processing and binaryzation pretreatment, then carry out median filter processing；
Horizontal and vertical scanning distinguished to treated image in 2 D code, the intersection point of lateral segment and longitudinal segment is positioning pattern
Center and scan arrive anchor point；
It is acquired according to the anchor point scanned from standard two-dimensional code coordinate to the perspective transform image coordinate；
All code element informations are obtained according to the relationship of perspective transform, even-odd check is carried out to code element information, further according to inspection and is covered
The mask method recorded in code row carries out mask, the data encoded originally.
2. strip small two-dimension code recognition methods according to claim 1, which is characterized in that the two dimensional code is lateral 5
The rectangle two dimensional code of longitudinal 17 symbols of symbol *, the two dimensional code is by 5 column symbols from left to right and 17 row symbols from top to bottom
Composition.
3. strip small two-dimension code recognition methods according to claim 2, which is characterized in that the 1st row to the 4th row and
14 rows to the 17th behavioral data code line, the information for indicating different for carrying out data encoding；
5th V&V of behavior and mask row, for carrying out data parity check and mask；
Blank line is arranged in 6th row and the 12nd row；
The figure that 7th row to the 11st row forms is positioning pattern, for positioning to two dimensional code；13rd behavior bottom row is used
In the direction for determining two dimensional code.
4. strip small two-dimension code recognition methods according to claim 3, which is characterized in that in the verification and mask row
Between that at least there are two colors is different for the rectangular cells of three symbols among three symbols and the next row.
5. strip small two-dimension code recognition methods according to claim 3, which is characterized in that each code element passes through a side
Shape unit is indicated, and all rectangular cells are marked by two kinds of colors of black and white, black symbol representative 1, white symbol generation
Table 0.
6. strip small two-dimension code recognition methods according to claim 5, which is characterized in that the shape of the positioning pattern
It immobilizes, the shape of the positioning pattern is " returning " font.
7. strip small two-dimension code recognition methods according to claim 6, which is characterized in that when the positioning scanned the two-dimensional code
When figure, black five part of black and white black and white, ratio 1:1:1:1:1 are divided by positioning pattern by the line at positioning pattern center；It is right
The intersection point of the horizontal and vertical scanning of image difference that treated, lateral segment and longitudinal segment is the center of positioning pattern.
8. strip small two-dimension code recognition methods according to claim 7, which is characterized in that right when Scan orientation point
Each positioning pattern, which is scanned, determines four anchor points a, b, c, d；The horizontal scan line and positioning for crossing positioning pattern center are schemed
Shape outer layer black silhouette line meets at l, and r two o'clock is scanned up using l as starting point along positioning pattern black outer edge, calculates scanning
Each point is anchor point a apart from maximum point, other anchor points b, c, d analogize at a distance from positioning pattern center in the process
Scanning obtains.
9. strip small two-dimension code recognition methods according to claim 8, which is characterized in that described to be determined according to what is scanned
Site is acquired to be specifically included from standard two-dimensional code coordinate to the perspective transform image coordinate:
The coordinate of the corresponding points of anchor point a, b, c, d in standard two-dimensional code includes: the first for (0,6), (5,6),
(5,11), (0,11);Second is (5,6), (5,11), (0,11), (0,6);The third is (5,11), (0,
11), (0,6), (5,6);4th kind is (0,11), (0,6), (5,6), (5,11)；
To every kind of situation, it is known that a in image, b, the coordinate of 4 coordinates of c, d and corresponding points in standard two-dimensional code are acquired from mark
Quasi- two dimensional code coordinate is to the perspective transform between image coordinate.
10. strip small two-dimension code recognition methods according to claim 9, which is characterized in that described according to perspective transform
Relationship obtain all code element informations, even-odd check is carried out to code element information, further according to examining and the mask that records in mask row
Method carries out mask, and the data encoded originally specifically include:
Transformation relation is obtained according to perspective transform, calculates data encoding row and verification and position of the mask row in image in 2 D code
It sets, obtains all code element informations；
Even-odd check is carried out to obtained code element information, is then covered according to inspection with the mask method recorded in mask row
Code, the data encoded originally.
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| WO2020186900A1 (en) * | 2019-03-18 | 2020-09-24 | 阿里巴巴集团控股有限公司 | Narrow-strip two-dimensional barcode, and method, apparatus and device for generating and recognizing narrow-strip two-dimensional barcode |
| CN112001469A (en) * | 2020-08-12 | 2020-11-27 | 北京太和互邦科技有限公司 | Two-dimensional code encoding method, decoding method and two-dimensional code |
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