CN103150538B - Number plate reflective membrane two-dimensional bar code recognizing apparatus and reading method - Google Patents
Number plate reflective membrane two-dimensional bar code recognizing apparatus and reading method Download PDFInfo
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- CN103150538B CN103150538B CN201310075771.2A CN201310075771A CN103150538B CN 103150538 B CN103150538 B CN 103150538B CN 201310075771 A CN201310075771 A CN 201310075771A CN 103150538 B CN103150538 B CN 103150538B
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Abstract
The invention provides a kind of number plate reflective membrane two-dimensional bar code recognizing apparatus, the control circuit unit of the enclosure that comprises shell, top cover, bottom, also comprise communication interface, is arranged on, camera, infrared light supply, annular minute surface, semi-transparent circle taper light shield; Described bottom has circle and windows, semi-transparent circle taper light shield is arranged on the side of enclosure near bottom, its deployment opening is identical towards the circle of the bottom diameter and its deployment opening diameter and the circle of bottom are windowed of windowing, and the deployment opening edge of semi-transparent circle taper light shield is fixed on the inwall of shell; Annular minute surface arranges around semi-transparent circle taper light shield and is fixed on the inwall of shell; Described infrared light supply is arranged on the top of annular minute surface and semi-transparent circle taper light shield; Described camera is arranged on the top of infrared light supply, and its camera lens aims at the contraction mouth of semi-transparent circle taper light shield through the opening in the middle of infrared light supply.The recognition of the two-dimensional bar code of the present invention on number plate of vehicle film against sunshine.
Description
Technical field
The present invention relates to a kind of bar code recognizing apparatus, especially a kind of automotive number plate reflective membrane two-dimensional bar code recognizing apparatus.
Background technology
Two-dimensional bar code recognizing apparatus common at present is generally made up of light source, optical lens, imageing sensor, graphics processing unit and shell.Its ultimate principle be light source irradiation scanning plane, reflection ray after optical lens again by imageing sensor imaging, imageing sensor acquisition scans image, then to be positioned the two-dimensional bar code on image by graphics processing unit and identifies and decode.
Learnt by research, Versatile two-dimension bar code recognizing apparatus is mainly used in scanning the black-and-white two color two-dimensional bar code above paper material.There is following shortcoming in the two-dimensional bar code of the color backgrounds such as recognition number plate:
1, the imageing sensor of common recognizing apparatus can only gather gray level image.Can jamming pattern be produced after the color background of number plate reflective membrane converts gray level image to, the requirement in two-dimensional bar code recognition dead zone cannot be met, cause two-dimensional bar code to be difficult to normal recognition.
2, reflective membrane surface smoother, the light source of two-dimensional bar code recognizing apparatus or environment light source are irradiated on reflective membrane can cause flare, needs not stop adjustment recognizing apparatus angle and position during scanning, avoids two-dimensional barcode image to be highlighted flare and pollutes.
3, kart number plate reflective membrane is covered by cyan ink, its two-dimensional bar code shows as the two-dimensional bar code of black fore dark blue background, due to mazarine and black difference too little, common recognizing apparatus cannot be distinguished, and the recognizing apparatus with the identifiable design color two dimension bar code of color image sensor also cannot normally identify.
Summary of the invention
The object of the invention is to overcome, supplement the deficiencies in the prior art, a kind of number plate reflective membrane two-dimensional bar code recognizing apparatus is provided and applies the reading method of this equipment, solve existing number plate reflective membrane background colour interference and flare cause bar code be difficult to recognition a difficult problem, to realize the quick position of the two-dimensional bar code on the automotive number plate such as kart, full-sized car reflective membrane and efficiently to distinguish.The technical solution used in the present invention is:
A kind of number plate reflective membrane two-dimensional bar code recognizing apparatus, the control circuit unit of the enclosure that comprises shell, top cover, bottom, also comprise communication interface, is arranged on, camera, infrared light supply, annular minute surface, semi-transparent circle taper light shield;
Described bottom has circle and windows, semi-transparent circle taper light shield is arranged on the side of enclosure near bottom, its deployment opening is identical towards the circle of the bottom diameter and its deployment opening diameter and the circle of bottom are windowed of windowing, and the deployment opening edge of semi-transparent circle taper light shield is fixed on the inwall of shell; Annular minute surface arranges around semi-transparent circle taper light shield and is fixed on the inwall of shell; Described infrared light supply is arranged on the top of annular minute surface and semi-transparent circle taper light shield; Described camera is arranged on the top of infrared light supply, and its camera lens aims at the contraction mouth of semi-transparent circle taper light shield through the opening in the middle of infrared light supply;
The output connection control circuit unit of camera, control circuit unit is connected with PC host computer by communication interface; Control circuit unit connects infrared light supply.
Described camera comprises camera case, graphics processing unit, imageing sensor, camera lens, is provided with visible ray and ends infrared fileter between camera lens and imageing sensor; Imageing sensor electrical connection graphics processing unit, graphics processing unit electrical connection control circuit unit;
The infrared external reflection light collected is carried out imaging and passes to graphics processing unit by imageing sensor, graphics processing unit process also identifies the infrared image received, and recognition result is sent to control circuit unit, recognition result is uploaded to PC host computer by communication interface by control circuit unit.
Described infrared light supply is ring-like infrarede emitting diode array, and the circular open in the middle of it passes for camera lens.
Described communication interface is usb communication interface, is arranged on the side on top cover.
Described shell is cuboid-type.
A kind of number plate reflective membrane two-dimensional bar code reading method, comprises following steps:
Step 1, PC upper computer software sends instruction, request number plate reflective membrane two-dimensional bar code recognizing apparatus recognition two-dimensional bar code;
Step 2, after control circuit unit receives instruction, drives infrared light supply to launch infrared light; The infrared portions launched shines directly into semi-transparent circle taper light shield, a part of infrared light is irradiated to semi-transparent circle taper light shield after annular mirror-reflection in addition, infrared light becomes coned face light source after the diffusion of semi-transparent circle taper light shield, and uniform irradiation is on number plate reflective membrane;
Step 3, infrared light enters camera lens after number plate reflective membrane dieletric reflection, with after end infrared fileter filtering visible ray through visible ray, then required infrared light is in imageing sensor imaging; Infrared image is converted to digital signal by imageing sensor, is transferred to graphics processing unit by data-interface;
Step 4, graphics processing unit carries out filtering, binary conversion treatment to infrared image, then carries out the location of two-dimensional bar code, identification and decoding;
Step 5, the recognition result of infrared image is sent to control circuit unit by graphics processing unit, and recognition result is uploaded to PC host computer by communication interface by control circuit unit.
Advantage of the present invention: this programme employs infrared light supply illumination, and is provided with visible ray in the camera and ends infrared fileter, eliminates ambient visible light interference, thus forms the infrared image of two-dimensional bar code in the camera, eliminates the interference of reflective membrane background color; In addition, the program also uses translucent taper light shield, improves light source by its diffuse effect.Above-mentioned recognizing apparatus and reading method, have that not affected by environment, recognition methods is simple, discrimination advantages of higher, effectively can identify the two-dimensional bar code on blueness, yellow, white number plate reflective membrane.
Accompanying drawing explanation
Fig. 1 is number plate reflective membrane two-dimensional bar code recognizing apparatus structural representation of the present invention.
Fig. 2 is camera structure schematic diagram of the present invention.
Fig. 3 is shell schematic diagram of the present invention.
Fig. 4 is circuit block diagram of the present invention.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in Figure 1 and Figure 2:
A kind of number plate reflective membrane two-dimensional bar code recognizing apparatus, control circuit unit 4, camera 5, infrared light supply 6, annular minute surface 7, the semi-transparent circle taper light shield 8 of shell 3 inside that comprises shell 3, top cover 2, bottom 9, also comprise communication interface 1, is arranged on;
Described bottom 9 has circle and windows, semi-transparent circle taper light shield 8 is arranged on the inner side near bottom 9 of shell 3, its deployment opening is identical towards the circle of bottom 9 diameter and its deployment opening diameter and the circle of bottom 9 are windowed of windowing, and the deployment opening edge of semi-transparent circle taper light shield 8 is fixed by screws on the inwall of shell 3; Annular minute surface 7 arranges around semi-transparent circle taper light shield 8 and is fixed by screws on the inwall of shell 3; Described infrared light supply 6 is arranged on the top of annular minute surface 7 and semi-transparent circle taper light shield 8; Described camera 5 is arranged on the top of infrared light supply 6, and its camera lens 24 aims at the contraction mouth of semi-transparent circle taper light shield 8 through the opening in the middle of infrared light supply 6.
The output connection control circuit unit 4 of camera 5, control circuit unit 4 is connected with PC host computer by communication interface 1; Control circuit unit 4 connects infrared light supply 6.
Described camera 5 comprises camera case 20, graphics processing unit 21, imageing sensor 22, camera lens 24, is provided with visible ray and ends infrared fileter 23 between camera lens 24 and imageing sensor 22; Imageing sensor 22 is electrically connected graphics processing unit 21, and graphics processing unit 21 is electrically connected control circuit unit 4; Visible ray ends infrared fileter 23 can by the visible ray filtering of number plate reflective membrane dieletric reflection.
The infrared external reflection light collected is carried out imaging and passes to graphics processing unit 21 by imageing sensor 22, graphics processing unit 21 processes and identifies the infrared image received, and recognition result is sent to control circuit unit 4, recognition result is uploaded to PC host computer by communication interface 1 by control circuit unit 4.
The Circuits System of described infrared light supply 6, imageing sensor 22, graphics processing unit 21, control circuit unit 4, communication interface 1 group of cost apparatus.Schematic block circuit diagram is with reference to Fig. 4.
Described infrared light supply 6 is ring-like infrarede emitting diode array, and the circular open in the middle of it passes for camera lens 24.
Described communication interface 1 is usb communication interface, is arranged on the side on top cover 2.
Described shell 3 is cuboid-type, as shown in Figure 3.
Number plate reflective membrane two-dimensional bar code reading method in the invention process example, for distinguishing the black two-dimensional bar code on the automotive number plate such as kart, full-sized car reflective membrane, apply above-mentioned number plate reflective membrane two-dimensional bar code recognizing apparatus, specifically comprise following steps:
Step 1, PC upper computer software sends instruction, request number plate reflective membrane two-dimensional bar code recognizing apparatus recognition two-dimensional bar code;
Step 2, after control circuit unit 4 receives instruction, drives infrared light supply 6 to launch infrared light; The infrared portions launched shines directly into semi-transparent circle taper light shield 8, a part of infrared light is irradiated to semi-transparent circle taper light shield 8 after annular minute surface 7 reflects in addition, infrared light becomes coned face light source after the diffusion of semi-transparent circle taper light shield 8, and uniform irradiation is on number plate reflective membrane;
Step 3, infrared light enters camera lens 24 after number plate reflective membrane dieletric reflection, with after end the useless visible ray of infrared fileter 23 filtering through visible ray, then required infrared light is in imageing sensor 22 imaging; Infrared image is converted to digital signal by imageing sensor 22, is transferred to graphics processing unit 21 by data-interface;
Step 4, graphics processing unit 21 pairs of infrared images carry out filtering, binary conversion treatment, then carry out the location of two-dimensional bar code, identification and decoding;
Step 5, the recognition result of infrared image is sent to control circuit unit 4 by graphics processing unit 21, and recognition result is uploaded to PC host computer by communication interface 1 by control circuit unit 4.
As can be seen from the structure of above number plate reflective membrane two-dimensional bar code recognizing apparatus with apply the method that this recognizing apparatus carries out two-dimensional bar code recognition, the present invention has the following advantages:
(1) use infrared light as lighting source, effectively eliminate color background interference.Because two-dimensional bar code code element is black, absorb infrared ray, and blue, yellow, white reflective membrane background reflectance infrared ray, and reflectivity is close, under infrared environmental, its background all becomes white, therefore, use infrared illumination, effectively can eliminate the color background interference of reflective membrane.
(2) infrared light directly or after annular minute surface 7 reflects through semi-transparent circle taper light shield 8, light source becomes coned face light source, thus make number plate reflective membrane medium obtain evenly soft illumination, avoid reflective membrane occurring highlight reflection hot spot, affect bar code reading.
(3) use visible ray to end infrared fileter 23 by visible ray filtering, avoid visible ray to enter the interference of imageing sensor 22 formation background, improve image quality.
Claims (6)
1. a number plate reflective membrane two-dimensional bar code recognizing apparatus, comprise shell (3), top cover (2), bottom (9), it is characterized in that: also comprise communication interface (1), be arranged on shell (3) inner control circuit unit (4), camera (5), infrared light supply (6), annular minute surface (7), semi-transparent circle taper light shield (8);
Described bottom (9) has circle and windows, semi-transparent circle taper light shield (8) is arranged on the inner side near bottom (9) of shell (3), its deployment opening is identical towards the circle of bottom (9) diameter and its deployment opening diameter and the circle of bottom (9) are windowed of windowing, and the deployment opening edge of semi-transparent circle taper light shield (8) is fixed on the inwall of shell (3); Annular minute surface (7) arranges around semi-transparent circle taper light shield (8) and is fixed on the inwall of shell (3); Described infrared light supply (6) is arranged on the top of annular minute surface (7) and semi-transparent circle taper light shield (8); Described camera (5) is arranged on the top of infrared light supply (6), and its camera lens (24) aims at the contraction mouth of semi-transparent circle taper light shield (8) through the opening in the middle of infrared light supply (6);
The output connection control circuit unit (4) of camera (5), control circuit unit (4) is connected with PC host computer by communication interface (1); Control circuit unit (4) connects infrared light supply (6).
2. number plate reflective membrane two-dimensional bar code recognizing apparatus as claimed in claim 1, it is characterized in that: described camera (5) comprises camera case (20), graphics processing unit (21), imageing sensor (22), camera lens (24), between camera lens (24) and imageing sensor (22), be provided with visible ray end infrared fileter (23); Imageing sensor (22) electrical connection graphics processing unit (21), graphics processing unit (21) electrical connection control circuit unit (4);
The infrared external reflection light collected is carried out imaging and passes to graphics processing unit (21) by imageing sensor (22), graphics processing unit (21) processes and identifies the infrared image received, and recognition result being sent to control circuit unit (4), recognition result is uploaded to PC host computer by communication interface (1) by control circuit unit (4).
3. number plate reflective membrane two-dimensional bar code recognizing apparatus as claimed in claim 1 or 2, is characterized in that: described infrared light supply (6) is ring-like infrarede emitting diode array, and the circular open in the middle of it passes for camera lens (24).
4. number plate reflective membrane two-dimensional bar code recognizing apparatus as claimed in claim 1 or 2, is characterized in that: described communication interface (1) is usb communication interface, is arranged on the side on top cover (2).
5. number plate reflective membrane two-dimensional bar code recognizing apparatus as claimed in claim 1 or 2, is characterized in that: described shell (3) is cuboid-type.
6. use number plate reflective membrane two-dimensional bar code recognizing apparatus as claimed in claim 2 to carry out a method for number plate reflective membrane two-dimensional bar code recognition, it is characterized in that, comprise the following steps:
Step 1, PC upper computer software sends instruction, request number plate reflective membrane two-dimensional bar code recognizing apparatus recognition two-dimensional bar code;
Step 2, after control circuit unit (4) receives instruction, drives infrared light supply (6) to launch infrared light; The infrared portions launched shines directly into semi-transparent circle taper light shield (8), a part of infrared light is irradiated to semi-transparent circle taper light shield (8) after annular minute surface (7) reflection in addition, infrared light becomes coned face light source after the diffusion of semi-transparent circle taper light shield (8), and uniform irradiation is on number plate reflective membrane;
Step 3, infrared light enters camera lens (24) after number plate reflective membrane dieletric reflection, with after end infrared fileter (23) filtering visible ray through visible ray, then required infrared light is in imageing sensor (22) imaging; Infrared image is converted to digital signal by imageing sensor (22), is transferred to graphics processing unit (21) by data-interface;
Step 4, graphics processing unit (21) carries out filtering, binary conversion treatment to infrared image, then carries out the location of two-dimensional bar code, identification and decoding;
Step 5, the recognition result of infrared image is sent to control circuit unit (4) by graphics processing unit (21), and recognition result is uploaded to PC host computer by communication interface (1) by control circuit unit (4).
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| CN201310075771.2A CN103150538B (en) | 2013-03-08 | 2013-03-08 | Number plate reflective membrane two-dimensional bar code recognizing apparatus and reading method |
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| CN201310075771.2A CN103150538B (en) | 2013-03-08 | 2013-03-08 | Number plate reflective membrane two-dimensional bar code recognizing apparatus and reading method |
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| CN103150538A CN103150538A (en) | 2013-06-12 |
| CN103150538B true CN103150538B (en) | 2015-10-28 |
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| US10430674B2 (en) * | 2015-12-14 | 2019-10-01 | Magna Electronics Inc. | Vehicle vision system using reflective vehicle tags |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1278088A (en) * | 1999-03-24 | 2000-12-27 | 符号技术有限公司 | Inverse reflextion scanning module used for electrooptical sensing device |
| CN2483775Y (en) * | 2001-06-21 | 2002-03-27 | 萧廷昊 | Bar code scanning pen |
| CN203179034U (en) * | 2013-03-08 | 2013-09-04 | 公安部交通管理科学研究所 | Number plate reflective membrane two-dimensional bar code reading device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6832724B2 (en) * | 1993-03-26 | 2004-12-21 | Symbol Technologies, Inc. | Electro-optical assembly for image projection, especially in portable instruments |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1278088A (en) * | 1999-03-24 | 2000-12-27 | 符号技术有限公司 | Inverse reflextion scanning module used for electrooptical sensing device |
| CN2483775Y (en) * | 2001-06-21 | 2002-03-27 | 萧廷昊 | Bar code scanning pen |
| CN203179034U (en) * | 2013-03-08 | 2013-09-04 | 公安部交通管理科学研究所 | Number plate reflective membrane two-dimensional bar code reading device |
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