CN203179034U - Number plate reflective membrane two-dimensional bar code reading device - Google Patents
Number plate reflective membrane two-dimensional bar code reading device Download PDFInfo
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- CN203179034U CN203179034U CN 201320107330 CN201320107330U CN203179034U CN 203179034 U CN203179034 U CN 203179034U CN 201320107330 CN201320107330 CN 201320107330 CN 201320107330 U CN201320107330 U CN 201320107330U CN 203179034 U CN203179034 U CN 203179034U
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- bar code
- dimensional bar
- reflective membrane
- number plate
- control circuit
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Abstract
The utility model provides a number plate reflective membrane two-dimensional bar code reading device, comprising a housing, a top cover, a bottom cover, a communication interface and a control circuit unit, a camera, an infrared light source, a circular mirror surface and a semitransparent conical photomask which are arranged in the housing; the bottom cover is provided with a circular window; the semitransparent conical photomask is installed on one side close to the bottom cover in the housing, an expansion port of the semitransparent conical photomask faces the circular window of the bottom cover and the diameter of the expansion port is equal to the diameter of the circular window of the bottom cover ; the rim of the expansion port of the semitransparent conical photomask is fixed to the inner wall of the housing. The circular mirror surface surrounds the semitransparent conical photomask and is fixed to the inner wall of the housing; the infrared light source is arranged above the circular mirror surface and the semitransparent conical photomask; the camera is arranged above the infrared light source and the lens traverses an intermediate opening of the infrared light source and aligns with a contraction port of the semitransparent conical photomask. The device is used for reading two-dimensional bar codes on a number plate reflective membrane.
Description
Technical field
The utility model 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
Common two-dimensional bar code recognizing apparatus generally is made of light source, optical lens, imageing sensor, graphics processing unit and shell at present.Its ultimate principle be light source irradiation scanning plane, reflection ray behind optical lens again by the imageing sensor imaging, imageing sensor acquisition scans image positions identification and decoding by graphics processing unit to the two-dimensional bar code on the image then.
Learn that by research the Versatile two-dimension bar code recognizing apparatus is mainly used in scanning the black-and-white two color two-dimensional bar code of paper material top.There is following shortcoming in the two-dimensional bar code of color backgrounds such as recognition number plate:
1, the imageing sensor of common recognizing apparatus can only be gathered gray level image.The color background of number plate reflective membrane can produce jamming pattern after converting gray level image to, can't satisfy the requirement in two-dimensional bar code recognition dead zone, causes two-dimensional bar code to be difficult to normal recognition.
2, reflective membrane surface smoother, the light filling source of two-dimensional bar code recognizing apparatus or environment light source shine on the reflective membrane and can cause flare, need not stop to adjust recognizing apparatus angle and position during scanning, avoid bar code image to be highlighted flare and pollute.
3, kart number plate reflective membrane is covered by mazarine printing ink, its two-dimensional bar code shows as the two-dimensional bar code of the dark blue background of black prospect, because mazarine and black difference are too little, common recognizing apparatus can't be distinguished, and the recognizing apparatus that has the color two dimension bar code identified of color image sensor also can't normally be identified.
Summary of the invention
The purpose of this utility model is to overcome, replenish the deficiencies in the prior art, a kind of number plate reflective membrane two-dimensional bar code recognizing apparatus is provided, solve the difficult problem that existing number plate reflective membrane background colour disturbs and flare causes bar code to be difficult to distinguish, with quick location and the efficient recognition that realizes the two-dimensional bar code on the automotive number plate reflective membranes such as kart, full-sized car.The technical solution adopted in the utility model is:
A kind of number plate reflective membrane two-dimensional bar code recognizing apparatus comprises shell, top cover, bottom, also comprises communication interface, is arranged on control circuit unit, camera, infrared light supply, annular minute surface, the semi-transparent circle taper light shield of enclosure;
Described bottom has circle and windows, semi-transparent circle taper light shield is installed in enclosure near a side of bottom, its deployment opening towards the circle of bottom window and its deployment opening diameter and the circle of the bottom diameter of windowing identical, the deployment opening edge of semi-transparent circle taper light shield is fixed on the inwall of shell; The annular minute surface centers on semi-transparent circle taper light shield setting 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 passes the contraction mouth that the middle opening of infrared light supply is aimed at semi-transparent circle taper light shield;
The output of camera connects the control circuit unit, and the control circuit unit is connected with the PC host computer by communication interface; The control circuit unit connects infrared light supply.
Described camera comprises camera case, graphics processing unit, imageing sensor, camera lens, is provided with visible light by saturating infrared fileter between camera lens and imageing sensor; Imageing sensor is electrically connected graphics processing unit, and graphics processing unit is electrically connected the control circuit unit;
Imageing sensor carries out the infrared external reflection light that collects imaging and passes to graphics processing unit, the infrared image that graphics processing unit is handled and identification receives, and recognition result is sent to the control circuit unit, the control circuit unit uploads to the PC host computer by communication interface with recognition result.
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 the usb communication interface, is installed in the side on the top cover.
Described shell is rectangular build.
Advantage of the present utility model: this programme has used the infrared light supply illumination, and is provided with visible light by saturating infrared fileter in camera, eliminates the ambient visible light interference, thereby forms the infrared image of two-dimensional bar code in camera, eliminates the reflective membrane background color and disturbs; In addition, this scheme is also used 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, the discrimination advantages of higher, can effectively identify the two-dimensional bar code on blueness, yellow, the white number plate reflective membrane.
Description of drawings
Fig. 1 is number plate reflective membrane two-dimensional bar code recognizing apparatus structural representation of the present utility model.
Fig. 2 is camera structure synoptic diagram of the present utility model.
Fig. 3 is shell synoptic diagram of the present utility model.
Fig. 4 is circuit block diagram of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with concrete drawings and Examples.
As shown in Figure 1 and Figure 2:
A kind of number plate reflective membrane two-dimensional bar code recognizing apparatus comprises shell 3, top cover 2, bottom 9, also comprises communication interface 1, is arranged on 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;
Described bottom 9 has circle and windows, semi-transparent circle taper light shield 8 is installed in shell 3 inner sides near bottom 9, its deployment opening towards the circle of bottom 9 window and its deployment opening diameter and the circle of bottom 9 diameter of windowing identical, the deployment opening edge of semi-transparent circle taper light shield 8 is fixed on the inwall of shell 3 by screw; Annular minute surface 7 arranges and is fixed on by screw on the inwall of shell 3 around semi-transparent circle taper light shield 8; 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 passes the contraction mouth that infrared light supply 6 middle openings are aimed at semi-transparent circle taper light shield 8.
The output of camera 5 connects control circuit unit 4, and control circuit unit 4 is connected with the 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 light by saturating 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 light can be with the visible light filtering of number plate reflective membrane dieletric reflection by saturating infrared fileter 23.
Described infrared light supply 6, imageing sensor 22, graphics processing unit 21, control circuit unit 4, communication interface 1 are formed the Circuits System of this device.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 the usb communication interface, is installed in the side on the top cover 2.
Described shell 3 is rectangular build, as shown in Figure 3.
Use above-mentioned number plate reflective membrane two-dimensional bar code recognizing apparatus, carry out the method for number plate reflective membrane two-dimensional bar code recognition, be used for the black two-dimensional bar code on the automotive number plate reflective membranes such as recognition kart, full-sized car, specifically comprise following steps:
Step 1, the 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 emission infrared lights; The infrared light of emission partly shines directly into semi-transparent circle taper light shield 8, a part of infrared light shines semi-transparent circle taper light shield 8 after annular minute surface 7 reflections in addition, infrared light becomes the coned face light source after the diffusion of semi-transparent circle taper light shield 8, uniform irradiation is to the number plate reflective membrane;
Step 3, infrared light enters camera lens 24 behind number plate reflective membrane dieletric reflection, and with ending saturating infrared fileter 23 filtering visible lights by visible light, required then infrared light is in imageing sensor 22 imagings; Imageing sensor 22 is converted to digital signal with infrared image, is transferred to graphics processing unit 21 by data-interface;
Step 5, graphics processing unit 21 is sent to control circuit unit 4 with the recognition result of infrared image, and control circuit unit 4 uploads to the PC host computer by communication interface 1 with recognition result.
From the structure of above number plate reflective membrane two-dimensional bar code recognizing apparatus with use method that this recognizing apparatus carries out two-dimensional bar code recognition as can be seen, the utlity model has following advantage:
(1) uses infrared light as lighting source, effectively eliminate color background and disturb.Because the 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, and its background all becomes white under infrared environment, therefore, use infrared illumination, the color background that can effectively eliminate reflective membrane disturbs.
(2) infrared light directly or through annular minute surface 7 reflection backs sees through semi-transparent circle taper light shield 8, light source becomes the coned face light source, thereby make number plate reflective membrane medium obtain evenly soft illumination, avoid occurring highlighted flare on the reflective membrane, influence bar code reading.
(3) use visible light to end saturating infrared fileter 23 with the visible light filtering, avoid visible light to enter imageing sensor 22 and form background interference, improve image quality.
Claims (5)
1. 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 installed in the inner side near bottom (9) of shell (3), its deployment opening towards the circle of bottom (9) window and its deployment opening diameter and the circle of bottom (9) diameter of windowing identical, 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 and is fixed on the inwall of shell (3) around semi-transparent circle taper light shield (8); 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) passes the contraction mouth that the middle opening of infrared light supply (6) is aimed at semi-transparent circle taper light shield (8);
The output of camera (5) connects control circuit unit (4), and control circuit unit (4) are connected with the 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), is provided with visible light by saturating 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);
Imageing sensor (22) carries out the infrared external reflection light that collects imaging and passes to graphics processing unit (21), the infrared image that graphics processing unit (21) is handled and identification receives, and recognition result is sent to control circuit unit (4), control circuit unit (4) upload to the PC host computer by communication interface (1) with recognition result.
3. number plate reflective membrane two-dimensional bar code recognizing apparatus as claimed in claim 1 or 2, it is characterized in that: described infrared light supply (6) is ring-like infrarede emitting diode array, 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 the usb communication interface, is installed in the side on the top cover (2).
5. number plate reflective membrane two-dimensional bar code recognizing apparatus as claimed in claim 1 or 2, it is characterized in that: described shell (3) is rectangular build.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320107330 CN203179034U (en) | 2013-03-08 | 2013-03-08 | Number plate reflective membrane two-dimensional bar code reading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320107330 CN203179034U (en) | 2013-03-08 | 2013-03-08 | Number plate reflective membrane two-dimensional bar code reading device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203179034U true CN203179034U (en) | 2013-09-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320107330 Expired - Fee Related CN203179034U (en) | 2013-03-08 | 2013-03-08 | Number plate reflective membrane two-dimensional bar code reading device |
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| Country | Link |
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| CN (1) | CN203179034U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103150538A (en) * | 2013-03-08 | 2013-06-12 | 公安部交通管理科学研究所 | Two-dimensional barcode reading equipment of reflecting film of license plate and reading method |
| CN106555938A (en) * | 2016-11-28 | 2017-04-05 | 北京慧眼智行科技有限公司 | A kind of illuminator of hide information collection |
-
2013
- 2013-03-08 CN CN 201320107330 patent/CN203179034U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103150538A (en) * | 2013-03-08 | 2013-06-12 | 公安部交通管理科学研究所 | Two-dimensional barcode reading equipment of reflecting film of license plate and reading method |
| CN103150538B (en) * | 2013-03-08 | 2015-10-28 | 公安部交通管理科学研究所 | Number plate reflective membrane two-dimensional bar code recognizing apparatus and reading method |
| CN106555938A (en) * | 2016-11-28 | 2017-04-05 | 北京慧眼智行科技有限公司 | A kind of illuminator of hide information collection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20150308 |
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| EXPY | Termination of patent right or utility model |