CN108959998A - Two-dimensional code identification method, apparatus and system - Google Patents
Two-dimensional code identification method, apparatus and system Download PDFInfo
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- CN108959998A CN108959998A CN201810665147.0A CN201810665147A CN108959998A CN 108959998 A CN108959998 A CN 108959998A CN 201810665147 A CN201810665147 A CN 201810665147A CN 108959998 A CN108959998 A CN 108959998A
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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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- 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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Abstract
The present invention provides a kind of two-dimensional code identification method, apparatus and system, is related to image identification technical field, two-dimensional code identification method, comprising: obtain image in 2 D code to be identified；Image in 2 D code to be identified is pre-processed；Pretreated image in 2 D code is positioned, target two-dimension code area is obtained；Feature extraction and identification are carried out to target two-dimension code area, obtain the recognition result of image in 2 D code to be identified.The two dimensional code Machine Vision Inspecting System that the present invention can be developed based on LabVIEW, quick, efficient and inexpensive two-dimensional barcode information recognition is realized by digital image processing method, it is imaged by common camera, is identified using soft decoding, fundamentally reduce barcode scanning cost.
Description
Technical field
The present invention relates to image identification technical fields, more particularly, to a kind of two-dimensional code identification method, apparatus and system.
Background technique
Technical grade barcode scanning equipment principle is usually in the market: scanner issues Ray Of Light by a laser diode,
It being irradiated on the prism that one rotates or the mirror to swing back and forth, the light after reflection passes through reading window and is irradiated to bar code surface,
Light returns to reader after bar code reflects, and is acquired, is focused by a mirror, is converted into telecommunications by photoelectric converter
Number, which will be decoded by the decoding software on scanner or terminal.
The dust-proof drop resistant of existing industry barcode scanning equipment, recognition rate is also fast, and adjoint rigid disadvantage is also apparent from: price is high
It is expensive.General average expert equipment price is at 1000 yuan or so, and then wanting for some famous brands is 6.7 thousand even up to ten thousand.
Summary of the invention
In view of this, can be based on the purpose of the present invention is to provide a kind of two-dimensional code identification method, apparatus and system
The two dimensional code Machine Vision Inspecting System of LabVIEW exploitation, is realized quick, efficient and inexpensive by digital image processing method
Two-dimensional barcode information recognition, imaged by common camera, using soft decoding identify, fundamentally reduction barcode scanning cost.
In a first aspect, the embodiment of the invention provides a kind of two-dimensional code identification methods, comprising:
Obtain image in 2 D code to be identified；
Image in 2 D code to be identified is pre-processed；
Pretreated image in 2 D code is positioned, target two-dimension code area is obtained；
Feature extraction and identification are carried out to target two-dimension code area, obtain the recognition result of image in 2 D code to be identified.
With reference to first aspect, the embodiment of the invention provides the first possible embodiments of first aspect, wherein obtains
Image in 2 D code to be identified is taken, is specifically included:
The operational order of user is received, operational order is the instruction and serial ports selection instruction for enabling driving camera；
According to operational order, driving camera is called from LabVIEW program panel, corresponding serial ports is selected to connect, configuration
File is driven, to acquire two-dimensional code graphical information；
And real-time display is carried out to two-dimensional code graphical information, using the graphical information of display as image in 2 D code to be identified.
With reference to first aspect, the embodiment of the invention provides second of possible embodiments of first aspect, wherein
According to operational order, driving camera is called from LabVIEW program panel, selects corresponding serial ports to connect, configuration driven file
Before, further includes:
Image pick-up card is initialized.
With reference to first aspect, the embodiment of the invention provides the third possible embodiments of first aspect, wherein also
Include:
One group of memory space is established as buffer area by IMAQ Create.vi to store image in 2 D code to be identified.
With reference to first aspect, the embodiment of the invention provides the 4th kind of possible embodiments of first aspect, wherein right
Image in 2 D code to be identified is pre-processed, and is specifically included:
Receive the filter command of user；
According to filter command, median filtering is carried out using the MATLAB script node Calling MATLAB in LabVIEW.
With reference to first aspect, the embodiment of the invention provides the 5th kind of possible embodiments of first aspect, wherein
It is also wrapped before carrying out median filtering using the MATLAB script node Calling MATLAB in LabVIEW according to filter command
It includes:
Gray processing processing is carried out to image in 2 D code to be identified.
With reference to first aspect, the embodiment of the invention provides the 6th kind of possible embodiments of first aspect, wherein
After image in 2 D code to be identified progress gray processing processing, further includes:
Binary conversion treatment is carried out to gray processing treated image in 2 D code；The method of binary conversion treatment includes: histogram
It is any in Two-peak method, P parametric method, maximum variance between clusters, maximum entropy threshold method and iterative method.
With reference to first aspect, the embodiment of the invention provides the 7th kind of possible embodiments of first aspect, wherein right
Pretreated image in 2 D code is positioned, and is obtained target two-dimension code area, is specifically included:
Automatic coordinate setting is carried out using TransformROI VI function, obtains target two-dimension code area.
Second aspect, the embodiment of the present invention also provide a kind of two-dimension code recognition device, comprising:
Image capture module, for obtaining image in 2 D code to be identified；
Preprocessing module, for being pre-processed to image in 2 D code to be identified；
Locating module obtains target two-dimension code area for positioning to pretreated image in 2 D code；
Identification module obtains image in 2 D code to be identified for carrying out feature extraction and identification to target two-dimension code area
Recognition result.
The third aspect, the embodiment of the present invention also provide a kind of two dimensional code identifying system, comprising: photographic device and server；
Installation is just like two-dimension code recognition device described in second aspect on server.
The embodiment of the present invention bring it is following the utility model has the advantages that
Two-dimensional code identification method provided in an embodiment of the present invention includes: to obtain image in 2 D code to be identified；To be identified two
Dimension code image is pre-processed；Pretreated image in 2 D code is positioned, target two-dimension code area is obtained；To target two
It ties up code region and carries out feature extraction and identification, obtain the recognition result of image in 2 D code to be identified.The embodiment of the present invention being capable of base
In LabVIEW exploitation two dimensional code Machine Vision Inspecting System, by digital image processing method realize it is quick, efficient and it is low at
This two-dimensional barcode information recognition, imaged by common camera, using soft decoding identify, fundamentally reduction barcode scanning at
This.
Other features and advantages of the present invention will illustrate in the following description, also, partly become from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention are in specification, claims
And specifically noted structure is achieved and obtained in attached drawing.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of method flow diagram for two-dimensional code identification method that the embodiment of the present invention one provides；
Fig. 2 is the method flow diagram for another two-dimensional code identification method that the embodiment of the present invention one provides；
The schematic diagram of Image Acquisition in a kind of two-dimensional code identification method that Fig. 3 provides for the embodiment of the present invention one；
The schematic diagram of median filtering in a kind of two-dimensional code identification method that Fig. 4 provides for the embodiment of the present invention one；
Effect contrast figure in a kind of two-dimensional code identification method that Fig. 5 provides for the embodiment of the present invention one after median filtering；
Effect contrast figure in a kind of two-dimensional code identification method that Fig. 6 provides for the embodiment of the present invention one after binaryzation；
Schematic diagram is positioned in a kind of two-dimensional code identification method that Fig. 7 provides for the embodiment of the present invention one；
Fig. 8 is a kind of structural schematic diagram of two-dimension code recognition device provided by Embodiment 2 of the present invention；
Fig. 9 is a kind of structural schematic diagram for two dimensional code identifying system that the embodiment of the present invention three provides.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Existing industry barcode scanning equipment recognition rate is fast but expensive.Based on this, the embodiment of the present invention provides one kind two
Code recognition methods, apparatus and system are tieed up, the two dimensional code Machine Vision Inspecting System that can be developed based on LabVIEW passes through number
Image processing method realizes quick, efficient and inexpensive two-dimensional barcode information recognition, is imaged, is utilized by common camera
Soft decoding identification, fundamentally reduces barcode scanning cost.
For convenient for understanding the present embodiment, first to a kind of two-dimensional code identification method disclosed in the embodiment of the present invention
It describes in detail.
Embodiment one:
Shown in Figure 1 the embodiment of the invention provides a kind of two-dimensional code identification method, this method is based on LabVIEW
What the two dimensional code Machine Vision Inspecting System of exploitation was realized, this method is performed in server end, before method execution, is needed
The IMAQ Vision vision and motion module provided by LabVIEW, i.e. graphical programming language, finishing man-machine interaction interface,
Port connection between the design of program chart algorithm and modules, guarantees that system operates normally.Two-dimensional code identification method is specific
The following steps are included:
S11: image in 2 D code to be identified is obtained.
The step realizes that specific process includes following steps by the image capture module in server, ginseng
As shown in Figure 2:
S111: receiving the operational order of user, and operational order is the instruction and serial ports selection instruction for enabling driving camera.
S112: according to operational order, driving camera is called from LabVIEW program panel, corresponding serial ports is selected to connect,
Configuration driven file, to acquire two-dimensional code graphical information.
S113: real-time display is carried out to two-dimensional code graphical information, using the graphical information of display as two dimensional code figure to be identified
Picture.
Above-mentioned according to operational order, driving camera is called from LabVIEW program panel, corresponding serial ports is selected to connect
It connects, before configuration driven file, further includes step, image pick-up card is initialized.
When specific implementation, driving camera vi is called in LabVIEW program panel, corresponding serial ports is selected to connect,
Configuration driven file.Image pick-up card initialization (img0) first is carried out before system operation, then carries out instruction triggers, acquisition figure letter
Breath and real-time display image, finally close image pick-up card.One group of memory is established by IMAQ Create.vi in this course
Space stores the graphical information of external acquirement as buffer area.Capture program structure is made of While circulation, therefore circulation is adopted
The figure signal of collection can be covered in memory space by continually entering, and constitute the real-time display (Image Out) of figure.Image is adopted
It is as shown in Figure 3 to collect program.
S12: image in 2 D code to be identified is pre-processed.
Can not there was only two dimensional code by the picture that camera is clapped, further comprise many other irrelevant informations, need at this time
Image preprocessing eliminates in picture most garbage signals, the two dimensional code effective information that reservation system need to acquire.
Camera sensing device when acquiring image information using light as input/output signal, in this course without can
It avoids that disturbance factor, such as noise, depth of exposure etc. can be generated.These disturbance factors will lead to image information and be mingled with coarse pixel,
I.e. usually said noise.Typical salt-pepper noise would generally be generated during image in 2 D code acquisition, therefore acquires figure
It needs to be filtered as after, to improve the precision of images.
Specifically, receiving the filter command of user；According to filter command, saved using the MATLAB script in LabVIEW
Point Calling MATLAB carries out median filtering.
Median filter is a kind of Nonlinear Smoothing Filter, can eliminate in image isolate noise spot, and can produce compared with
Few is fuzzy.Median filtering is carried out using the MATLAB script node Calling MATLAB in LabVIEW.Median filtering design
As shown in Figure 4.
Median filtering function medfilt2 () is single channel filtering in Matlab, and the color image of system acquisition is threeway
Road.Therefore it also needs that picture is first carried out gray processing processing I=rgb2gray (G) before Calling MATLAB is filtered.It is testing
The salt-pepper noise that joined to original image 10% in program, Contrast on effect such as (a) in Fig. 5 after being handled with median filter,
(b), (c), (d) are shown.
(a) it is original two dimensional code image, is (b) image in 2 D code of the salt-pepper noise of addition 10%, (c) for after gray processing
Picture, be (d) image after median filtering, it is clear that from comparison diagram it can be seen that the figure after median filtering is more clear
It is clear.
In order to further increase the clarity of image in 2 D code, reach the other requirement of technical grade, above-mentioned to two dimensional code figure
After carrying out gray processing processing, then binary conversion treatment is carried out to it.
Binaryzation is image processing techniques more further than gray processing, and gray processing is will be in color image by processing
The value of tri- pigment components of RGB is all equal, selects gray level in 256 (0~255) a palettes.And binaryzation is by image
Upper pixel gray value is set as 0 or 255, that is, image is become to black and white tone completely.Because of image in 2 D code sheet
Body is exactly to be made of a series of lattice of black and white, has respectively represented binary zero and 1 (0 represents white, and 1 represents black).Two
Image in 2 D code can be become the bar code of only black and white in binaryzation by dimension code, then be converted into binary system according to analytic formula
Information.This has just greatly saved memory space, and reduces the operand in later period.
Specific implementation process are as follows: IMAQ ImageToArray VI function is called in LabVIEW, function is after filtering
The point of all pixels in figure is converted into two-dimensional array.The array is inputted into the double-deck FOR loop, cycle-index is by array
Size determines, a threshold value is set in FOR loop, and the point greater than the threshold value exports 255, and the point less than the threshold value exports 0.This
Sample can generate a new two-dimensional array, and element is only 0 or 255 in array.Finally recall IMAQ
ArrayToImage VI function can convert binary image for two bit arrays.The key point of the process is the choosing of threshold value
It takes, usually common method has in image binaryzation threshold value selection: 1. histogram Two-peak methods, 2.P parametric method, between 3. maximum kinds
Variance method, 4. maximum entropy threshold methods, 5. iterative methods (are also best threshold method).
P parametric method be usually used in required target area in whole image proportion it is known that and acquisition image resolution ratio not
The case where change.
1) it, finds out image histogram and is distributed P (t), t=0,1 ... 255.
2) threshold value, is calculated:
Fig. 6 is the figure that original gradation figure seeks threshold value binaryzation again by P parametric method, it can be seen that after binaryzation, is schemed
Material particular is remarkably reinforced in shape, fundamentally improves visual quality, improves image definition.
After pre-processing by above-mentioned median filtering, gray processing and binaryzation, garbage can be effectively removed, is saved effective
Signal simultaneously enhances effective information, improves the detection and reliability of system.Graphical information is maximally simplified, system is improved
Operational efficiency and recognition speed.
S13: positioning pretreated image in 2 D code, obtains target two-dimension code area.
A most important ring to the positioning of two-dimension code area in whole figure, using be based on morphologic ROI positioning mode,
In NI Vision vision module, calling IMAQ Construct ROI creation image is shown and corresponding tool, selects ROI work
Tool.The content representative of ROI is a cluster data, the array formed including an integer array and a cluster.There are 4 in integer array
Element, outlines the four edges coordinate of two dimensional code on the front panel, and each number of clusters group be by types of profiles, ROI type with
And figure coordinate point composition.The region for needing to handle and position in entire picture is outlined with various figures, is referred to as felt emerging
Interesting region ROI.In the present embodiment, two dimensional code region is area-of-interest, after image preprocessing, two dimensional code figure
The gradient of picture, color become apparent with texture.Using TransformROI VI function can automatic coordinate setting, to complete
The two dimensional code in target image is found by ROI positioning method, as shown in Figure 7.
S14: feature extraction and identification are carried out to target two-dimension code area, obtain the identification knot of image in 2 D code to be identified
Fruit.
After obtaining target two-dimension code area, feature extraction is carried out to it, obtains final recognition result.
The embodiment of the present invention, by examining camera, image pick-up card, LabVIEW software and NI Vision machine vision
Survey technology combines, and a kind of high-precision two-dimensional code identification method of technical grade is provided, using median filtering, gray processing, binaryzation
Pretreated image is benchmark image, and the feature extraction of two dimensional code is determined with ROI positioning mode, and carries out final two dimensional code letter
Breath identification.By test, this method scans bar code accuracy rate height, and recognition speed is fast, and low in cost, is using common camera
Achievable profession barcode scanning functions of the equipments.Application value all with higher and dissemination in industrial application and social life.
Embodiment two:
The embodiment of the present invention also provides a kind of two-dimension code recognition device, shown in Figure 8, which includes: Image Acquisition
Module 21, preprocessing module 22, locating module 23 and identification module 24.
Wherein, image capture module 21, for obtaining image in 2 D code to be identified；Preprocessing module 22 is known for treating
Other image in 2 D code is pre-processed；Locating module 23 obtains target for positioning to pretreated image in 2 D code
Two-dimension code area；Identification module 24 obtains two dimensional code to be identified for carrying out feature extraction and identification to target two-dimension code area
The recognition result of image.
In two-dimension code recognition device provided by the embodiment of the present invention, including skill identical with aforementioned two-dimensional code identification method
Therefore above-mentioned function equally may be implemented in art feature.The specific work process of modules is referring to above method reality in the present apparatus
Example is applied, details are not described herein.
Embodiment three:
The embodiment of the present invention also provides a kind of two dimensional code identifying system, and shown in Figure 9, which includes: photographic device
31 and server 32.Two-dimension code recognition device 321 as described in embodiment two is installed on the server 32.The photographic device 31
It can be common camera, be also possible to more expensive industrial camera, be not specifically limited herein.
In two-dimension code recognition device provided by the embodiment of the present invention, including skill identical with aforementioned two-dimension code recognition device
Therefore above-mentioned function equally may be implemented in art feature.The specific work process of modules is referring to above-mentioned apparatus reality in this system
Example is applied, details are not described herein.
The computer program product of two-dimensional code identification method provided by the embodiment of the present invention, including storing processor can
The computer readable storage medium of the non-volatile program code executed, before the instruction that said program code includes can be used for execution
Method described in the embodiment of the method for face, specific implementation can be found in embodiment of the method, and details are not described herein.
It is apparent to those skilled in the art that for convenience and simplicity of description, the device of foregoing description
And the specific work process of electronic equipment, it can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
The flow chart and block diagram in the drawings show multiple embodiment method and computer program products according to the present invention
Architecture, function and operation in the cards.In this regard, each box in flowchart or block diagram can represent one
A part of module, section or code, a part of the module, section or code include it is one or more for realizing
The executable instruction of defined logic function.It should also be noted that in some implementations as replacements, function marked in the box
It can also can occur in a different order than that indicated in the drawings.For example, two continuous boxes can actually be substantially parallel
Ground executes, they can also be executed in the opposite order sometimes, and this depends on the function involved.It is also noted that block diagram
And/or the combination of each box in flow chart and the box in block diagram and or flow chart, it can the function as defined in executing
Can or the dedicated hardware based system of movement realize, or can come using a combination of dedicated hardware and computer instructions real
It is existing.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.The apparatus embodiments described above are merely exemplary, for example, the division of the unit,
Only a kind of logical function partition, there may be another division manner in actual implementation, in another example, multiple units or components can
To combine or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or beg for
The mutual coupling, direct-coupling or communication connection of opinion can be through some communication interfaces, device or unit it is indirect
Coupling or communication connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in the executable non-volatile computer-readable storage medium of a processor.Based on this understanding, of the invention
Technical solution substantially the part of the part that contributes to existing technology or the technical solution can be with software in other words
The form of product embodies, which is stored in a storage medium, including some instructions use so that
One computer equipment (can be personal computer, server or the network equipment etc.) executes each embodiment institute of the present invention
State all or part of the steps of method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-
Only Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can be with
Store the medium of program code.
Finally, it should be noted that embodiment described above, only a specific embodiment of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, those skilled in the art should understand that: anyone skilled in the art
In the technical scope disclosed by the present invention, it can still modify to technical solution documented by previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover in protection of the invention
Within the scope of.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. a kind of two-dimensional code identification method characterized by comprising
Obtain image in 2 D code to be identified；
The image in 2 D code to be identified is pre-processed；
The pretreated image in 2 D code is positioned, target two-dimension code area is obtained；
Feature extraction and identification are carried out to the target two-dimension code area, obtain the identification knot of the image in 2 D code to be identified
Fruit.
2. being specifically included the method according to claim 1, wherein described obtain image in 2 D code to be identified:
The operational order of user is received, the operational order is the instruction and serial ports selection instruction for enabling driving camera；
According to the operational order, driving camera is called from LabVIEW program panel, corresponding serial ports is selected to connect, configuration
File is driven, to acquire two-dimensional code graphical information；
And real-time display is carried out to the two-dimensional code graphical information, using the graphical information of the display as the two dimension to be identified
Code image.
3. according to the method described in claim 2, it is characterized in that, described according to the operational order, from LabVIEW program
Driving camera is called in panel, corresponding serial ports is selected to connect, before configuration driven file, further includes:
Image pick-up card is initialized.
4. according to the method in claim 2 or 3, which is characterized in that further include:
One group of memory space is established as buffer area by IMAQ Create.vi to store the image in 2 D code to be identified.
5. the method according to claim 1, wherein described locate the image in 2 D code to be identified in advance
Reason, specifically includes:
Receive the filter command of user；
According to the filter command, median filtering is carried out using the MATLAB script node Calling MATLAB in LabVIEW.
6. according to the method described in claim 5, it is characterized in that, described according to the filter command, using in LabVIEW
MATLAB script node Calling MATLAB carry out median filtering before, further includes:
Gray processing processing is carried out to the image in 2 D code to be identified.
7. according to the method described in claim 6, it is characterized in that, carrying out gray scale to the image in 2 D code to be identified described
After change processing, further includes:
Binary conversion treatment is carried out to the gray processing treated image in 2 D code；The method of the binary conversion treatment includes: straight
It is any in square figure Two-peak method, P parametric method, maximum variance between clusters, maximum entropy threshold method and iterative method.
8. the method according to claim 1, wherein described determine the pretreated image in 2 D code
Position, obtains target two-dimension code area, specifically includes:
Automatic coordinate setting is carried out using TransformROI VI function, obtains the target two-dimension code area.
9. a kind of two-dimension code recognition device characterized by comprising
Image capture module, for obtaining image in 2 D code to be identified；
Preprocessing module, for being pre-processed to the image in 2 D code to be identified；
Locating module obtains target two-dimension code area for positioning to the pretreated image in 2 D code；
Identification module obtains the two dimensional code to be identified for carrying out feature extraction and identification to the target two-dimension code area
The recognition result of image.
10. a kind of two dimensional code identifying system characterized by comprising photographic device and server；
Two-dimension code recognition device as claimed in claim 9 is installed on the server.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109711223A (en) * | 2018-12-28 | 2019-05-03 | 福州符号信息科技有限公司 | A kind of promotion QR code decoding rate method and apparatus |
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