CN108345817A - A kind of recognition methods of cylindrical surface Quick Response Code - Google Patents
A kind of recognition methods of cylindrical surface Quick Response Code Download PDFInfo
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- CN108345817A CN108345817A CN201810115231.5A CN201810115231A CN108345817A CN 108345817 A CN108345817 A CN 108345817A CN 201810115231 A CN201810115231 A CN 201810115231A CN 108345817 A CN108345817 A CN 108345817A
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- quick response
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- response code
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- positioning pattern
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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
- G06K7/146—Methods for optical code recognition the method including quality enhancement steps
- G06K7/1473—Methods for optical code recognition the method including quality enhancement steps error correction
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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 recognition methods of cylindrical surface Quick Response Code, are related to image processing field, positioning pattern self-defined first, form special pattern with Quick Response Code, are pasted onto on cylindrical surface after printing, shoot n clear photographs, n >=2 in order；Then, it all identifies the positioning pattern in n photos, projective transformation coefficient is solved further according to positioning pattern, projective transformation flattening is carried out into n two-dimension code images to n distortion figures；N two-dimension code image cuttings are spliced to form complete two-dimension code pattern again, finally, identify complete two-dimension code pattern, obtain the information of former Quick Response Code, the recognition methods that the present invention solves existing cylindrical surface Quick Response Code needs particular device and stringent requirement of taking pictures, and can only identify the cylindrical surface Quick Response Code of specific arc, cause inconvenient to use and the problem of cannot promote the use of.
Description
Technical field
The present invention relates to image processing field, more particularly to a kind of recognition methods of cylindrical surface Quick Response Code.
Background technology
With the increasingly maturation of image processing techniques, the use of Quick Response Code in people's daily life is more and more extensive, and two
It is a kind of barcode standard more more advanced than one-dimension code to tie up code, and Quick Response Code can both horizontally and vertically store information, can store up
The information such as Chinese character, number and picture are deposited, other than having the advantages that one-dimension code, while the also big, reliability with information capacity
High, the advantages that security and antiforge purpose is strong and application field is wide.
The one kind of QR codes as Quick Response Code is the matrix two-dimensional code that Japanese Denso companies developed in 1994, full name
It is quick response matrix code.It not only has the advantages that other Quick Response Codes, also has 360 degrees omnidirection, ultrahigh speed recognition etc. excellent
Point, especially it indicate Chinese character with 13bit compress modes, than other Quick Response Codes indicate Chinese character efficient 20%, to
So that QR codes is become and is highly suitable for the Quick Response Code that China promotes the use.Since 2010, the train ticket in China used QR
Code replaces one-dimension code, stores with ticket information for train ticket to be anti-fake, along with the burning hot application of Quick Response Code, widens Quick Response Code
Use occasion and enhancing orientation performance are a fields for being worth research.
Currently, the research about Quick Response Code identification technology just intimately carries out, but most of concentrate on is studying its identification speed
On degree, it is rarely studied using place, although also all being deposited about the recognition methods of research Quick Response Code on cylinder song
In some problems, for example, need particularly customized identification equipment or need fixed shooting style and angle that could identify, and
Can only identification division radian cylindrical surface Quick Response Code, these methods are in practical applications, all very inconvenient, can not push away on a large scale
It is wide to use.
Invention content
It is an object of the invention to：A kind of recognition methods of cylindrical surface Quick Response Code is provided, self-defined positioning pattern is utilized
The cylinder Quick Response Code for identifying arbitrary radian under different angle by common photographing device, solves existing cylindrical surface Quick Response Code
Recognition methods need particular device and stringent requirement of taking pictures, and can only identify the cylindrical surface Quick Response Code of specific arc, cause
It is inconvenient to use and the problem of cannot promote the use of.
The technical solution adopted by the present invention is as follows：
A kind of recognition methods of cylindrical surface Quick Response Code, includes the following steps：
Step 1：N clear photographs, n >=2, at this point, on photo are shot in order to the special pattern on cylindrical surface
Figure is the distortion figure with positioning pattern；
Step 2：Positioning pattern in the n that whole identification steps 1 obtain a distortion figures；
Step 3：According to the positioning pattern of identification by n distortion figure flattenings at n two-dimension code images；
Step 4：Cutting splicing is carried out to n two-dimension code images of flattening, forms complete two-dimension code pattern；
Step 5：Complete two-dimension code pattern is identified, the information that former Quick Response Code includes is obtained.
Further, the step 1 the specific steps are：
Step 1.1：Self-defined positioning pattern；
Step 1.2：Customized positioning pattern is positioned against to the position at the up and down or left and right both sides edge of Quick Response Code
It sets, generates special pattern；
Step 1.3：It is affixed on after special pattern is printed on the cylinder surfaces of revolution, makes the both sides for posting positioning pattern perpendicular to circle
The longitudinal axis of column is parallel to the longitudinal axis of cylinder without the both sides of positioning pattern；
Step 1.4：N clear photographs are shot in order to the special pattern posted on cylindrical surface, n >=2, at this point, according to
The figure of on piece is the distortion figure with positioning pattern.
Further, the step 2 the specific steps are：
Step 2.1：Fixation and recognition is carried out to the n distortion figures that step 1.4 is shot；
Step 2.2：If step 2.1 identifies all positioning patterns, projective transformation point is determined by positioning pattern
Coordinate；
Step 2.3：If step 2.1 None- identified goes out all positioning patterns, return to step 1.4 re-shoots photo.
Further, the step 3 the specific steps are：
Step 3.1：Using the central point or angle point of the positioning pattern that step 2.2 identifies, projective transformation coefficient is solved；
Step 3.2：Using the projective transformation coefficient found out, projective transformation is carried out to distortion figure, by n distortion figure exhibitions
N two-dimension code images of Heisei.
Further, the positioning pattern in the step 1.1 can be different colours, figure of different shapes.
Further, the equipment that the step 1.4 is taken pictures can be mobile phone, tablet computer or other tools of taking pictures.
Further, the step 3.1 solve projective transformation coefficient the specific steps are：
Step 3.1.1：If (x0,y0),(x1,y1),(x2,y2),(x3,y3) be original shooting figure on piece Quick Response Code coordinate,
(u0,v0),(u1,v1),(u2,v2),(u3,v3) be projective transformation after positive usual coordinates, a, b, c, d, e, f, g, h be conversion formula
In 8 projective transformation coefficients to be solved；
Step 3.1.2：Show that the formula of projective transformation is：
Step 3.1.3：According to the formula of step 3.1.2, it is after arrangement：
Step 3.1.4：The fixed coordinates of image, bring into after taking the calibration point of positioning pattern and correcting accordingly
3.1.3 it in formula, can obtain：
Step 3.1.5：After the formula of solution procedure 3.1.4,8 projective transformation coefficients are obtained.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1. a kind of recognition methods of cylindrical surface Quick Response Code limits positioning by the unique positioning pattern of self-definition design
Position, then special pattern is generated with Quick Response Code, there is originality, do not have to worry leakage of information, also add the identification of Quick Response Code
Accuracy recycles existing two-dimensional code decoder to be identified, and does not have particular requirement to identification equipment, method is simple and clear, more
It is suitble to promote the use of；
2. the equipment that the present invention takes pictures can be mobile phone, tablet computer or other tools of taking pictures, need not specifically take pictures
Equipment, the scope of application are wider；
3. the present invention to special pattern by carrying out splicing identification, in the case where ensureing recognition correct rate, to different bats
The accuracy for taking the photograph the Quick Response Code identification under angle is higher, has the characteristics that computation complexity is relatively low.
Description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is a kind of flow chart of the recognition methods of cylindrical surface Quick Response Code；
Fig. 2 is a kind of embodiment of the present invention.
Specific implementation mode
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
It elaborates to the present invention with reference to Fig. 1, Fig. 2.
A kind of recognition methods of cylindrical surface Quick Response Code, includes the following steps：
Step 1：N clear photographs, n >=2, at this point, on photo are shot in order to the special pattern on cylindrical surface
Figure is the distortion figure with positioning pattern；
Step 1.1：Self-defined positioning pattern；
Step 1.2：Customized positioning pattern is positioned against to the position at the up and down or left and right both sides edge of Quick Response Code
It sets, generates special pattern；
Step 1.3：It is affixed on after special pattern is printed on the cylinder surfaces of revolution, makes the both sides for posting positioning pattern perpendicular to circle
The longitudinal axis of column is parallel to the longitudinal axis of cylinder without the both sides of positioning pattern；
Step 1.4：N clear photographs are shot in order to the special pattern posted on cylindrical surface, n >=2, at this point, according to
The figure of on piece is the distortion figure with positioning pattern；
Step 2：Positioning pattern in the n that whole identification steps 1 obtain a distortion figures；
Step 2.1：Fixation and recognition is carried out to the n distortion figures that step 1.4 is shot；
Step 2.2：If step 2.1 identifies all positioning patterns, projective transformation point is determined by positioning pattern
Coordinate；
Step 2.3：If step 2.1 None- identified goes out all positioning patterns, return to step 1.4 re-shoots photo；
Step 3：According to the positioning pattern of identification by n distortion figure flattenings at n two-dimension code images；
Step 3.1：Using the central point or angle point of the positioning pattern that step 2.2 identifies, projective transformation coefficient is solved；
Step 3.2：Using the projective transformation coefficient found out, projective transformation is carried out to distortion figure, by n distortion figure exhibitions
N two-dimension code images of Heisei；
Step 4：Cutting splicing is carried out to n two-dimension code images of flattening, forms complete two-dimension code pattern；
Step 5：Complete two-dimension code pattern is identified, the information that former Quick Response Code includes is obtained.
Further, the positioning pattern in the step 1.1 can be different colours, figure of different shapes.
Further, the equipment that the step 1.4 is taken pictures can be mobile phone, tablet computer or other tools of taking pictures.
Further, the step 3.1 solve projective transformation coefficient the specific steps are：
Step 3.1.1：If (x0,y0),(x1,y1),(x2,y2),(x3,y3) be original shooting figure on piece Quick Response Code coordinate,
(u0,v0),(u1,v1),(u2,v2),(u3,v3) be projective transformation after positive usual coordinates, a, b, c, d, e, f, g, h be conversion formula
In 8 projective transformation coefficients to be solved；
Step 3.1.2：Show that the formula of projective transformation is：
Step 3.1.3：According to the formula of step 3.1.2, it is after arrangement：
Step 3.1.4：The fixed coordinates of image, bring into after taking the calibration point of positioning pattern and correcting accordingly
3.1.3 it in formula, can obtain：
Step 3.1.5：After the formula of solution procedure 3.1.4,8 projective transformation coefficients are obtained.
Specific embodiments of the present invention are：
As shown in Fig. 2, for a customized positioning pattern in the embodiment of the present invention, the two of specially two interconnections
Code view finding figure is tieed up, black and white is than meeting 1：1：3：1：1：1：3：1：1, it selects a QR version to be equal to 3 Quick Response Code, positioning is schemed
Shape is positioned against the position at the up and down or left and right both sides edge of Quick Response Code, generates special pattern, and cylinder rotation is affixed on after printing
Turn on face；
First, against special pattern shooting n clear photographs successively from left to right, n >=2, in the present embodiment, n=3,
The left, center, right part of special pattern is shot respectively, and the photo taken is 3 distortion figures for carrying positioning pattern；
Then, three of the shooting distortion figures with positioning pattern are subjected to fixation and recognition, if identifying all positioning
Figure, then determine the coordinate of projective transformation point by positioning pattern, if cannot recognize that all positioning patterns, re-shoots
Photo；
The central point or angle point for recycling the positioning pattern identified carry out projective transformation, by 3 distortion figure flattenings
Cutting splicing is carried out at 3 two-dimension code images, and to 3 two-dimension code images, it is generally the case that in order to improve the mistake of picture splicing
Cross the apparent lapping defect of part, can use distance weighting method to transition portion into row interpolation, to the effect for making human eye observe
Fruit is more preferable, however, the purpose of the present embodiment is to identify the content of Quick Response Code with decoder, and interpolation can cause mould to transition portion
The effect of paste so that the accuracy of decoder identification declines, therefore eliminates interpolation herein, using directly carrying out cutting spelling to picture
The mode connect forms complete two-dimension code pattern；
Finally, the full graphics spliced is identified using existing two-dimensional code decoder, obtains former Quick Response Code packet
The information contained.
The present invention limits position location by the unique positioning pattern of self-definition design, then specific with Quick Response Code generation
Figure has originality, does not have to worry leakage of information, also adds the recognition accuracy of Quick Response Code, recycle existing Quick Response Code
Decoder is identified, and does not have particular requirement to identification equipment, and method is simple and clear, is more suitable for promoting the use of.
The above, only the preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, it is any
Those skilled in the art within the technical scope disclosed by the invention, can without the variation that creative work is expected or
It replaces, should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be limited with claims
Subject to fixed protection domain.
Claims (6)
1. a kind of recognition methods of cylindrical surface Quick Response Code, which is characterized in that include the following steps：
Step 1：N clear photographs, n >=2, at this point, the figure on photo are shot in order to the special pattern on cylindrical surface
For the distortion figure with positioning pattern；
Step 2：Positioning pattern in the n that whole identification steps 1 obtain a distortion figures；
Step 3：According to the positioning pattern of identification by n distortion figure flattenings at n two-dimension code images；
Step 4：Cutting splicing is carried out to the n two-dimension code images that step 3 flattens, forms complete two-dimension code pattern；
Step 5：Complete two-dimension code pattern is identified, the information that former Quick Response Code includes is obtained.
2. a kind of recognition methods of cylindrical surface Quick Response Code according to claim 1, it is characterised in that：The step 1 is specific
Step is：
Step 1.1：Self-defined positioning pattern；
Step 1.2：Customized positioning pattern is positioned against to the position at the up and down or left and right both sides edge of Quick Response Code, it is raw
At special pattern；
Step 1.3：It is affixed on after special pattern is printed on the cylinder surfaces of revolution, makes the both sides for posting positioning pattern perpendicular to cylinder
The longitudinal axis is parallel to the longitudinal axis of cylinder without the both sides of positioning pattern；
Step 1.4：N clear photographs, n >=2, at this point, on photo are shot in order to the special pattern posted on cylindrical surface
Figure be the distortion figure with positioning pattern.
3. a kind of recognition methods of cylindrical surface Quick Response Code according to claim 2, it is characterised in that：The step 2 is specific
Step is：
Step 2.1：Fixation and recognition is carried out to the n distortion figures that step 1.4 is shot；
Step 2.2：If step 2.1 identifies all positioning patterns, the coordinate of projective transformation point is determined by positioning pattern；
Step 2.3：If step 2.1 None- identified goes out all positioning patterns, return to step 1.4 re-shoots photo.
4. a kind of recognition methods of cylindrical surface Quick Response Code according to claim 3, it is characterised in that：The step 3 is specific
Step is：
Step 3.1：Using the central point or angle point of the positioning pattern that step 2.2 identifies, projective transformation coefficient is solved；
Step 3.2：Using the projective transformation coefficient found out, projective transformation is carried out to distortion figure, by n distortion figures flattenings at
N two-dimension code images.
5. a kind of recognition methods of cylindrical surface Quick Response Code according to claim 2, it is characterised in that：In the step 1.1
Positioning pattern, can be different colours, figure of different shapes.
6. a kind of recognition methods of cylindrical surface Quick Response Code according to claim 2, it is characterised in that：The step 1.4 is clapped
According to equipment can be mobile phone, tablet computer or other tools of taking pictures.
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| CN112547576A (en) * | 2020-12-21 | 2021-03-26 | 山东大舜医药物流有限公司 | Vaccine sorting line ex-warehouse rechecking system |
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Application publication date: 20180731 |