CN106845314B - A kind of method for rapidly positioning of two dimensional code - Google Patents
A kind of method for rapidly positioning of two dimensional code Download PDFInfo
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- CN106845314B CN106845314B CN201611232321.XA CN201611232321A CN106845314B CN 106845314 B CN106845314 B CN 106845314B CN 201611232321 A CN201611232321 A CN 201611232321A CN 106845314 B CN106845314 B CN 106845314B
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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 proposes a kind of method for rapidly positioning of two dimensional code, include the following steps: S1, obtain image in 2 D code to be processed；The step S1 image in 2 D code obtained is converted to gray level image by S2；S3, median filtering；S4, edge detection；S5, parallel coordinates positioning；Wherein, the step S5 specifically comprises the following steps: S51, and the step S4 edge image got is mapped on parallel coordinates；S52, the edge image that step S4 is got is rotated along Y-axis, and postrotational edge image is mapped on parallel coordinates；The spacing for each intersection point on image that the spacing and step S52 for each intersection point on image that S53, comparison step S51 are obtained obtain, coordinate corresponding to the equal point of spacing describe the region where two dimensional code jointly.A kind of method for rapidly positioning of two dimensional code provided by the invention quickly positions two dimensional code region under complex background.
Description
Technical field
The present invention relates to two dimensional code fields, and in particular to a kind of method for rapidly positioning of two dimensional code.
Background technique
Two dimensional code be distributed in plane i.e. two-dimensional directional according to certain rules with certain specific geometric figure it is black
White alternate graphic recording data symbol information；Composition computer-internal logical foundations are dexterously utilized in code compilation
The concept of " 0 ", " 1 " bit stream indicates text numerical information using several geometrical bodies corresponding with binary system, passes through
Image input device or photoelectric scanning device automatically identifying and reading are to realize automatic processing of information: it has some total of barcode technology
Property: every kind of code system has its specific character set；Each character occupies certain width；With certain verifying function etc..Simultaneously
Also have to the information automatic identification function and the processing rotationally-varying point of figure that do not go together.Two dimensional code is a kind of image identification skill
Art stores the advantages that information category is more, and error correcting capability is strong because having memory capacity big, in article code, the neck such as mobile payment
Domain is widely used.
Two dimensional code has a wide range of application, therefore its application environment is relative complex.The picture got often has complicated back
Scape in decoding process, need to navigate to the specific region of two dimensional code from picture.Common method disappears in two dimensional code positioning stage
Time-consuming is long.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of method for rapidly positioning of two dimensional code.Provided by the invention one
The method for rapidly positioning of kind two dimensional code quickly positions two dimensional code region under complex background.
The technical solution adopted by the invention is as follows:
A kind of method for rapidly positioning of two dimensional code, includes the following steps:
S1 obtains image in 2 D code to be processed；
The step S1 image in 2 D code obtained is converted to gray level image by S2；
S3, median filtering；
S4, edge detection；
S5, parallel coordinates positioning；
Wherein, the step S5 specifically comprises the following steps:
The step S4 edge image got is mapped on parallel coordinates by S51；
S52, the edge image that step S4 is got is rotated along Y-axis, and postrotational edge image is mapped in parallel
On coordinate；
On the image that the spacing and step S52 for each intersection point on image that S53, comparison step S51 are obtained obtain
The spacing of each intersection point, coordinate corresponding to the equal point of spacing describe the region where two dimensional code, the spacing phase jointly
Deng point refer to point equal between the spacing of the intersection point inside step S51 or S52.
The method for rapidly positioning of above-mentioned a kind of two dimensional code, wherein the step S4 specifically includes use " Canny " operator
Extract the edge of image.
A kind of method for rapidly positioning of above-mentioned two dimensional code, wherein the step S2 is specifically included: the figure that step S1 is obtained
Picture respectively indicates the red, green, blue component of each pixel in color image with R, G, B, the corresponding picture of gray level image after conversion
The brightness value of vegetarian refreshments is I, then:
I=0.3*R+0.59*G+0.11*B.
The present invention provide the beneficial effects of the present invention are: by image carry out gradation conversion, median filtering, edge examine
After survey, the edge line of image is obtained, further whether judges edge line to being converted to for parallel coordinates using cartesian coordinate
Correctly.Its is easy to operate, is not related to complicated calculations, and by mathematical model, promotes precision.Under complex background, to two dimensional code
Region is quickly positioned, applied widely.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is a kind of flow chart of the method for rapidly positioning of two dimensional code of the present invention；
Fig. 2 is an image in 2 D code example in a kind of method for rapidly positioning of two dimensional code of the present invention；
Fig. 3 is edge line example corresponding with Fig. 2 in a kind of method for rapidly positioning of two dimensional code of the present invention；
Fig. 4 is that the cartesian coordinate point (0,2) and (2,0) in a kind of method for rapidly positioning of two dimensional code of the present invention are mapped to
The schematic diagram of parallel coordinates.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment
As shown in Figure 1, a kind of method for rapidly positioning of two dimensional code, includes the following steps:
S1 obtains image in 2 D code to be processed；The color image of equipment acquisition thecamera head.
The step S1 image in 2 D code obtained is converted to gray level image by S2；Gray level image, that is, image brightness values are arrived 0
255 image.The image that step S1 is obtained, the red, green, blue component of each pixel in color image is respectively indicated with R, G, B,
The brightness value of the corresponding pixel of gray level image after converting is I, then: I=0.3*R+0.59*G+0.11*B.
S3, median filtering；Since camera and transmission process will receive the influence for the factors such as electric current is unstable, image can go out
Existing other bright spot, i.e. salt-pepper noise.In order to eliminate the influence of salt-pepper noise, need to carry out median filtering to image.Intermediate value filter
Wave is a kind of nonlinear filter.In the window of definition, it is ranked up by the pixel value size of image, takes the number in middle position
Result as filter output.
S4, edge detection；Use the edge of " Canny " operator extraction image.After edge detection, the side of image is obtained
Edge, edge are made of line.It is exactly some parallel lines, as shown in Figure 2 and Figure 3 after two dimensional code edge detection.
S5, parallel coordinates positioning；
Wherein, the step S5 specifically comprises the following steps:
The step S4 edge image got is mapped on parallel coordinates by S51；It, will be two-dimentional according to parallel coordinates principle
Code is considered as the image in cartesian coordinate, then the straight line of cartesian coordinate is mapped as the point of parallel coordinates, but can only be to negative
The mapping of slope straight line.Cartesian coordinate point (0,2) and (2,0) are mapped to parallel coordinates, as shown in Figure 4.
S52, the edge image that step S4 is got is rotated along Y-axis, and postrotational edge image is mapped in parallel
On coordinate；Because parallel coordinates can only detect the straight line of negative slope, this step rotates edge image along y-axis, re-maps flat
On row coordinate, the straight line of positive slope in original image can detecte at this time.
On the image that the spacing and step S52 for each intersection point on image that S53, comparison step S51 are obtained obtain
The spacing of each intersection point, coordinate corresponding to the equal point of spacing describe the region where two dimensional code, the spacing phase jointly
Deng point refer to point equal between the spacing of the intersection point inside step S51 or S52.In two images, the equal point of spacing is just
It is two dimensional code region.The straight line of negative slope in image is detected in step S51, and image positive slope is detected in step S52
Straight line.In addition, the spacing of each parallel lines is equal, therefore, the image after the mapping of two width is compared, the equal point of spacing is just
It is the region of two groups of parallel lines intersection, two dimensional code region can be positioned as.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of method for rapidly positioning of two dimensional code, which comprises the steps of:
S1 obtains image in 2 D code to be processed；
The step S1 image in 2 D code obtained is converted to gray level image by S2；
S3, median filtering；
S4, edge detection；
S5, parallel coordinates positioning；
Wherein, the step S5 specifically comprises the following steps:
The step S4 edge image got is mapped on parallel coordinates by S51；
S52, the edge image that step S4 is got is rotated along Y-axis, and postrotational edge image is mapped to parallel coordinates
On；
It is each on the image that the spacing and step S52 for each intersection point on image that S53, comparison step S51 are obtained obtain
The spacing of intersection point, coordinate corresponding to the equal point of spacing describe the region where two dimensional code jointly, and the spacing is equal
Point refers to point equal between the spacing of the intersection point inside step S51 or S52.
2. a kind of method for rapidly positioning of two dimensional code according to claim 1, which is characterized in that the step S4 is specifically wrapped
Include the edge of use " Canny " operator extraction image.
3. a kind of method for rapidly positioning of two dimensional code according to claim 1 or 2, which is characterized in that the step S2 tool
Body includes: the image that step S1 is obtained, and the red, green, blue component of each pixel in color image is respectively indicated with R, G, B, is turned
The brightness value of the corresponding pixel of gray level image after changing is I, then: I=0.3*R+0.59*G+0.11*B.
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| CN106845314B (en) * | 2016-12-28 | 2019-07-12 | 广州智慧城市发展研究院 | A kind of method for rapidly positioning of two dimensional code |
| CN108985129B (en) * | 2018-08-02 | 2021-11-23 | 谷东科技有限公司 | Two-dimensional code positioning and detecting method |
| CN110348265B (en) * | 2019-07-19 | 2022-04-05 | 福建工程学院 | Novel matrix code restoration method based on parallel coordinate system |
| CN111178111A (en) * | 2019-12-31 | 2020-05-19 | 航天信息股份有限公司 | Two-dimensional code detection method, electronic device, storage medium and system |
| CN116776909B (en) * | 2023-08-28 | 2023-11-03 | 四川星点网络技术有限公司 | Bottle lid two-dimensional code system of tracing to source |
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| CN102074051A (en) * | 2011-01-13 | 2011-05-25 | 深圳市蓝韵实业有限公司 | Fast locating method for data bonding volume of volume rendering parallel projection |
| CN103354928A (en) * | 2012-02-03 | 2013-10-16 | 日本电气株式会社 | Device, method, and program for visualization of multi-dimensional data |
| CN106845314A (en) * | 2016-12-28 | 2017-06-13 | 广州智慧城市发展研究院 | A kind of method for rapidly positioning of Quick Response Code |
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| DE10244181A1 (en) * | 2002-09-23 | 2004-04-01 | Siemens Ag | Image forming method in computer tomography, by filtering data output from detector array and back-projecting, with rays weighted based on position in beam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102074051A (en) * | 2011-01-13 | 2011-05-25 | 深圳市蓝韵实业有限公司 | Fast locating method for data bonding volume of volume rendering parallel projection |
| CN103354928A (en) * | 2012-02-03 | 2013-10-16 | 日本电气株式会社 | Device, method, and program for visualization of multi-dimensional data |
| CN106845314A (en) * | 2016-12-28 | 2017-06-13 | 广州智慧城市发展研究院 | A kind of method for rapidly positioning of Quick Response Code |
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Effective date of registration: 20231117 Address after: 6 / F, block a, 88 Tiangui Road, Huadu District, Guangzhou, Guangdong 510800 Patentee after: DEVELOPMENT Research Institute OF GUANGZHOU SMART CITY Patentee after: GUANGZHOU BOCHUANG INFORMATION TECHNOLOGY CO.,LTD. Address before: 6 / F, block a, 88 Tiangui Road, Huadu District, Guangzhou, Guangdong 510800 Patentee before: DEVELOPMENT Research Institute OF GUANGZHOU SMART CITY Patentee before: GUANGZHOU BOCHUANG INFORMATION TECHNOLOGY CO.,LTD. Patentee before: Guangzhou Zhongke Integrated Circuit Design Co.,Ltd. |