CN204348070U - The recognition device of car plate and video camera, system for Car license recognition - Google Patents
The recognition device of car plate and video camera, system for Car license recognition Download PDFInfo
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- CN204348070U CN204348070U CN201420749653.5U CN201420749653U CN204348070U CN 204348070 U CN204348070 U CN 204348070U CN 201420749653 U CN201420749653 U CN 201420749653U CN 204348070 U CN204348070 U CN 204348070U
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Abstract
The utility model discloses a kind of recognition device of car plate and video camera, the system for Car license recognition, this device comprises: high-pass filter, carries out transparent transmission for utilizing the penetrating film set up to the infrared light of the default wave band of vehicle reflection in the first image of current shooting; Or all-pass optical filter, carries out transparent transmission for the light launched vehicle license plate in the first image; ICR, for connecting high-pass filter or all-pass optical filter under the control of a processor; Processor, high-pass filter or all-pass optical filter is switched to for control ICR, determine that the first image is in infrared mode, and in utilizing penetrating film to the first image the infrared light of default wave band of vehicle reflection carry out transparent transmission or utilize all-pass optical filter to the first image in after the light of vehicle reflection carries out transparent transmission, know information according to the first kind board prestored to identify the car plate of vehicle in the first image, and then improve Car license recognition rate, guarantee the picture luminance of shooting at night.
Description
Technical field
The utility model relates to field of video monitoring, the recognition device in particular to a kind of car plate and the video camera for Car license recognition, system.
Background technology
There are two optical filters in two optical-filter switcher (ICR), one of them optical filter uses by day, and another one then can use at night, can guarantee that the color of image taken by day is full thus, and the distance of shooting at night is enough far away.Infrared ICR in correlation technique switches camera can exist following problem usually:
Problem one, empty burnt (focusing on unclear) problem, according to infrared lens, then therefore camera cost can increase, according to non-infrared lens, then cannot focused IR light and visible ray, camera can be caused thus empty burnt.
Problem two, picture luminance are not up to standard, because car plate very easily overexposure and smudgy under infrared light filling, see vehicle window clearly if want, then overexposure phenomenon can occur car plate, easily causes board to be known and greatly reduces; See car plate clearly if want, then vehicle window too secretly cannot be seen clearly.
Problem three, picture quality are not up to standard, and under the application scenarios of infrared light filling, picture achromatization, this can cause certain harmful effect to vehicle body identification and Car license recognition.
Utility model content
The utility model embodiment provides a kind of recognition device of car plate and video camera, the system for Car license recognition, sets at least to solve the car plate provided in correlation technique the problem that method exists empty burnt, picture luminance or quality dissatisfaction.
According to an aspect of the present utility model, provide a kind of recognition device of car plate.
Recognition device according to the car plate of the utility model embodiment comprises: high-pass filter, carries out transparent transmission for utilizing the penetrating film set up to the infrared light of the default wave band of vehicle reflection in the first image of current shooting, or all-pass optical filter, carries out transparent transmission for the light launched vehicle license plate in the first image, ICR, is connected with high-pass filter or all-pass optical filter, for connecting high-pass filter or all-pass optical filter under the control of a processor, processor, be connected with high-pass filter or all-pass optical filter, high-pass filter or all-pass optical filter is switched to for control ICR, determine that the first image is in infrared mode, and in utilizing penetrating film to the first image the infrared light of default wave band of vehicle reflection carry out transparent transmission or utilize all-pass optical filter to the first image in after the light of vehicle reflection carries out transparent transmission, know information according to the first kind board prestored to identify the car plate of vehicle in the first image, wherein, the content that first kind board knows information shown on the car plate to vehicle in the first image taken under infrared mode identifies.
Preferably, processor, also for according to the yield value of therein and the comparative result of the first predetermined threshold value and by light sensors sense to illumination brightness and the comparative result of the second predetermined threshold value determine enter Night or enter day mode.
Preferably, processor, also for when determining to enter Night, stepper motor is chosen the first universal input/output (GPIO) pin be communicated with high-pass filter or all-pass optical filter, and switches to high-pass filter or all-pass optical filter by a GPIO pin output high level pulse signal control ICR.
Preferably, said apparatus also comprises: low pass filter, and for filtering the infrared light of vehicle reflection in the second image of current shooting, wherein, low pass filter is different from the thickness of high-pass filter or all-pass optical filter; Processor, is connected with low pass filter, also exports high level pulse signal control ICR for the 2nd GPIO pin be communicated with low pass filter by choosing on stepper motor and switches to low pass filter, determine that the second image is in non-infrared mode.
Preferably, processor, also identify the car plate of vehicle in the second image for knowing information according to the Equations of The Second Kind board prestored, wherein, the content that Equations of The Second Kind board knows information shown on the car plate to vehicle in the second image taken under non-infrared mode identifies.
According to another aspect of the present utility model, provide a kind of video camera for Car license recognition.
The video camera for Car license recognition according to the utility model embodiment comprises: the recognition device of above-mentioned car plate and non-infrared lens.
According to another aspect of the present utility model, provide a kind of system for Car license recognition.
The system for Car license recognition according to the utility model embodiment comprises: the above-mentioned video camera for Car license recognition and infrared light compensating lamp, and wherein, video camera and infrared light compensating lamp are used in conjunction with each other and identify the displaying contents on car plate.
By the utility model embodiment, adopt control ICR to switch to high-pass filter or all-pass optical filter, determine that the first image of current shooting is in infrared mode, in utilizing penetrating film that high-pass filter is set up to the first image the infrared light of the default wave band of vehicle reflection carry out transparent transmission or utilize all-pass optical filter to the first image in after the light of vehicle reflection carries out transparent transmission, know information according to the first kind board prestored to identify the car plate of vehicle in the first image, wherein, first kind board is known information and is used for identifying the content shown by the car plate taking vehicle in the first image under infrared mode, the car plate that solving provides in correlation technique sets method and exists empty burnt, the problem of picture luminance or quality dissatisfaction, and then improve Car license recognition rate, guarantee the picture luminance of shooting at night, light pollution can not be caused again.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, and form a application's part, schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation of the recognition device of car plate according to the utility model embodiment;
Fig. 2 is the ICR switching flow figure according to the utility model preferred embodiment;
Fig. 3 realizes the forward of stepper motor and counter-rotational schematic diagram according to the utility model preferred embodiment by GPIO pin signal;
Fig. 4 is the structural representation of the recognition device of car plate according to the utility model preferred embodiment;
Mark in above accompanying drawing is as follows: 10, high-pass filter; 20, all-pass optical filter; 30, ICR; 40, processor; 50, low pass filter.
Embodiment
Hereinafter also describe the utility model in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
In the following description, except as otherwise noted, the symbol otherwise with reference to the action performed by one or more computing machine and operation represents each embodiment describing the application.Wherein, computing machine comprises the various products such as personal computer, server, mobile terminal, employs the equipment that central processing unit (CPU), single-chip microcomputer, digital signal processor (DSP) etc. have a process chip and all can be called computing machine.Thus, be appreciated that processing unit that this kind of action performed sometimes referred to as computing machine and operation comprise computing machine is to the manipulation of electric signal representing data with structured form.It is safeguarded in this manipulation transforms data or the position in the accumulator system of computing machine, and this reshuffles or changes the operation of computing machine in the mode that those skilled in the art understands.The data structure of service data is the physical location of the storer of the particular community that the form with data defines.But although describe the utility model in above-mentioned context, it does not also mean that restrictive, as understood by those skilled in the art, hereinafter described action and each side of operation also can realize with hardware.
Turn to accompanying drawing, wherein identical reference number refers to identical element, and the principle of the application is shown in a suitable computing environment and realizes.Below describe the embodiment based on described the application, and should not think about the alternative embodiment clearly do not described herein and limit the application.
Following examples can be applied in computing machine, such as: be applied in personal computer (PC).Also can be applied in the mobile terminal that have employed at present in intelligent operating system, and be not limited to this.Operating system for computing machine or mobile terminal does not have particular/special requirement, as long as can detect contact, determine whether this contact is consistent with pre-defined rule, and realizes corresponding function according to the attribute of this contact.
Fig. 1 is the structural representation of the recognition device of car plate according to the utility model embodiment.As shown in Figure 1, the recognition device of this car plate can comprise: high-pass filter 10, carries out transparent transmission for utilizing the penetrating film set up to the infrared light of the default wave band of vehicle reflection in the first image of current shooting, or all-pass optical filter 20, carries out transparent transmission for the light launched vehicle license plate in the first image, ICR 30, is connected with high-pass filter 10 or all-pass optical filter 20, for connecting high-pass filter 10 or all-pass optical filter 20 under the control of processor 40, processor 40, be connected with high-pass filter 10 or all-pass optical filter 20, high-pass filter 10 or all-pass optical filter 20 is switched to for control ICR 30, determine that the first image is in infrared mode, and in utilizing penetrating film to the first image the infrared light of default wave band of vehicle reflection carry out transparent transmission or utilize all-pass optical filter 20 to the first image in after the light of vehicle reflection carries out transparent transmission, know information according to the first kind board prestored to identify the car plate of vehicle in the first image, wherein, the content that first kind board knows information shown on the car plate to vehicle in the first image taken under infrared mode identifies.
Low pass filter that the intelligent transportation capture machine that theres is provided in correlation technique uses (can through visible ray and stop the optical filter of infrared light), visible ray can be responded to well by day, stop infrared ray and the impact of other visible rays, make bright in luster true to nature; At night because surround lighting is relatively darker, need to use infrared lamp to carry out light filling to capture machine.If but now re-use used low pass filter on daytime, then infrared light can be caused to be filtered, thus to make picture entirety partially dark.Adopt method as shown in Figure 1, adopt the high-pass filter being coated with penetrating film (contrary with the function of low pass filter at night, can through infrared light and stop visible ray) and then stop and filter out the light of below infrared light, and can through light more than infrared light, or, utilize all-pass optical filter (i.e. full impregnated spectral filter, it can through the light of whole wavelength) transparent transmission is carried out to the light of car plate reflection, moreover, capture machine is converted to white-black pattern by color mode simultaneously, it is infrared more clear apart from farther to make, and then can not light pollution be caused again while guaranteeing the picture luminance of shooting at night.In addition, know storehouse (i.e. above-mentioned first database) by the infrared board newly-increased separately for Night and can also effectively improve Car license recognition rate.
It should be noted that, infrared mode processes without the car plate under color and the poor two kinds of situations of contrast targetedly mainly under black and white imaging.The infrared board knowledge technology that the utility model embodiment provides is except by after processing high-pass filter, under making Infrared, car plate contrast improves as far as possible, can also by improving algorithm, carry out particular algorithm process for characters on license plate and the lower situation of background color contrast, namely can be improved by hardware and software optimization reach the object improving the knowledge of infrared board jointly.
The visible ray light compensating lamp provided in correlation technique is made up of multiple spectrum, and its brightness is higher, crosses car and namely dodges, because may frighten driver and easily cause traffic hazard.For this reason, in preferred implementation process, the infrared light compensating lamp that the utility model embodiment uses makes certain improvements to spectrum, through the spectrum of more than 700nm, so can not bring the reaction of vision, reduces light pollution.
Preferably, processor 40, also for according to the yield value of therein and the comparative result of the first predetermined threshold value and by light sensors sense to illumination brightness and the comparative result of the second predetermined threshold value determine to enter Night or determine to enter day mode.
In a preferred embodiment, if processor 40 judge that yield value is greater than the first predetermined threshold value and illumination brightness is less than the second predetermined threshold value when, then determine to enter Night; If judge that yield value is less than the first predetermined threshold value and illumination brightness is greater than the second predetermined threshold value when, then determine to enter day mode.
It should be noted that, the comparatively figure of merit that above-mentioned first predetermined threshold value and above-mentioned second predetermined threshold value can be chosen from one group of numerical value, determine according to sensitivity, namely can switch sensitivity according to actual conditions adjustment.
As a preferred embodiment of the present utility model, Fig. 2 is the ICR switching flow figure according to the utility model preferred embodiment.As shown in Figure 2, this flow process can comprise following treatment step:
Step S202: device start, carries out initialization to the duty of stepper motor;
Step S204: the end points optical filter in stepper motor being moved to side;
Step S206: judge whether this stepper motor is in automatic switchover ICR pattern; If so, then continue to perform step S208; Otherwise continue maintenance and rest on this step, refusal performs follow-up flow process;
Step S208: (such as: 1 hour) judges whether this stepper motor is in anti-oscillating pattern continuously in preset duration; If so, then repeated execution of steps S208; If not, then continue to perform step S210;
Step S210: whether the number of times performing ICR switching in default sampling duration continuously exceedes predetermined threshold value (such as: 4 times); If so, then step S218 is forwarded to; If not, then continue to perform step S212;
Step S212: judge that applied environment is daytime or night according to gain and brightness; If daytime, then continue to perform step S214; If night, then forward step S220 to;
Step S214: judge whether ICR switches to day mode; If so, then step S206 is forwarded to; If not, then continue to perform step S216;
Step S216:ICR switches to day mode; Forward step S206 to;
Step S218:ICR switches to Night, and enters anti-oscillating pattern; Forward step S206 to;
Step S220: judge whether ICR switches to Night; If so, then step S206 is forwarded to; If not, then continue to perform step S222;
Step S222:ICR switches to Night; Forward step S206 to.
In preferred implementation process, anti-oscillating process can also be carried out by arranging ICR switching anti-oscillating processing module.Namely switch to the arbitrary pattern in day mode and Night as ICR after, judge whether ICR frequent switching (number of times switched continuously between pattern and Night by day exceedes specific threshold) occurs, if can determine that ICR is current to there occurs frequent switching (such as: occurred four times continuously by day between pattern and Night and switch), then can switch to Night and run preset duration (such as: 1 hour) under being locked in this Night, then, then resampling judge.
Preferably, processor 40, also for when determining to enter Night, stepper motor is chosen the first universal input/output (GPIO) pin be communicated with high-pass filter 10 or all-pass optical filter 20, and switches to high-pass filter 10 or all-pass optical filter 20 by a GPIO pin output high level pulse signal control ICR 30.
In a preferred embodiment, in order to daytime can be realized and night adopts dissimilar optical filter respectively, stepper motor can be adopted in video camera to connect two kinds of dissimilar optical filters (i.e. high-pass filter and low pass filter) respectively, rotated by the both forward and reverse directions of control step motor thus realize the handoff functionality of the dissimilar optical filter used at daytime and night.
The stepper motor that video camera uses can be realized its forward by control two universal input/output (GPIO) pin signals and be rotated backward.Fig. 3 realizes the forward of stepper motor and counter-rotational schematic diagram according to the utility model preferred embodiment by GPIO pin signal.As shown in Figure 3, when the pulse of the leading EN2 of the pulse of EN1, now step motor control optical filter moves to direction at night, and namely high-pass filter is in running order.
When infrared light filling, car plate background color and number-plate number contrast and discrimination all lower, board can be caused thus to know degree and greatly to reduce.The utility model embodiment is by conjunction with infrared light filling technology and infrared fileter handoff technique, according to the difference of car plate background color and number-plate number reflects infrared light band characteristic curve, high-pass filter is improved, the optionally infrared light of filter part wave band, car plate background color and the number-plate number are done and further accurately distinguishes, thus realize the object improving car plate sharpness.
Preferably, as shown in Figure 4, said apparatus can also comprise: low pass filter 50, for filtering the infrared light of vehicle reflection in the second image of current shooting, wherein, low pass filter 50 is different from the thickness of high-pass filter 10 or all-pass optical filter 20, by arranging different filter thickness, after day and night switching under making non-infrared lens, infrared and non-infrared under focus point can reach suppression, thus the focal length reaching infrared mode and non-infrared mode is unified, to improve the picture quality got; Processor 40, be connected with low pass filter 50, also export high level pulse signal control ICR 30 for the 2nd GPIO pin be communicated with low pass filter 50 by choosing on stepper motor and switch to low pass filter 50, determine that the second image is in non-infrared mode.
It should be noted that, the recognition device that above-mentioned all-pass optical filter and high-pass filter can't be arranged on above-mentioned car plate is simultaneously inner, also be not switched between all-pass optical filter and high-pass filter by processor control ICR, but recognition device all-pass optical filter and low pass filter being separately positioned on above-mentioned car plate is inner, and then switched between all-pass optical filter and low pass filter by processor control ICR; Or recognition device high-pass filter and low pass filter being separately positioned on above-mentioned car plate is inner, and then is switched between all-pass optical filter and low pass filter by processor control ICR.
In addition, adopt indicated by the solid line under the control of processor 40 current in the diagram, switched to low pass filter 50, and now, between ICR 30 and high-pass filter 10/ all-pass optical filter 20, there is not annexation, so adopt dotted line to be represented.
In a preferred embodiment, as shown in Figure 3 above, when the pulse of the leading EN1 of the pulse of EN2, then step motor control optical filter moves to direction on daytime, and namely low pass filter is by running order.
Preferably, processor 40, also identify the car plate of vehicle in the second image for knowing information according to the Equations of The Second Kind board prestored, wherein, the content that Equations of The Second Kind board knows information shown on the car plate to vehicle in the second image taken under non-infrared mode identifies.
License plate recognition technology in the correlation technique contrast mostly depended between car plate background color and the number-plate number navigates to car plate and identifies, however under infrared light filling scene car plate cross-color, contrast decline, board knowledge rate will reduce greatly.In a preferred embodiment, high-pass filter being improved, by adopting the mode of permeation parts infrared light, making the contrast between car plate background color and the number-plate number reach best.In addition, increase infrared board knowledge technology, again in conjunction with infrared light filling technology, car plate reflection technology and infrared fileter handoff technique, make under different filter pattern, different boards is used to know storehouse, namely switch to low pass filter under pattern by day and know storehouse (being equivalent to above-mentioned second database) according to colored board and (can include but not limited to: word the content that car plate shows, character) identify, and under Night, switch paramount pass filter or all-pass optical filter and know storehouse according to infrared board and (can include but not limited to: word the content that car plate shows, character) identify, thus reach high-precision board knowledge rate.
As another preferred embodiment of the present utility model, additionally provide a kind of video camera for Car license recognition.This video camera being used for Car license recognition can comprise: the recognition device of above-mentioned car plate and non-infrared lens.
As another preferred embodiment of the present utility model, additionally provide a kind of system for Car license recognition.This system can comprise: the above-mentioned video camera for Car license recognition and infrared light compensating lamp, and wherein, video camera and infrared light compensating lamp are used in conjunction with each other and identify the displaying contents on car plate.Video camera is after the all-pass being switched to night or high-pass filter, and can be carried out the light filling of optimum spectrum to video camera by extraneous infrared light compensating lamp, its first image obtained can be identified by system during the first board.
From above description, can find out, above embodiments enable following technique effect (it should be noted that these effects are effects that some preferred embodiment can reach): adopt the technical scheme that the utility model embodiment provides, by using non-infrared lens, be convenient to complete upgrading to existing camera; The infrared light compensating lamp that camera uses can either guarantee the picture luminance of shooting at night, can not cause light pollution again.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (7)
1. a recognition device for car plate, is characterized in that, comprising:
High-pass filter, carries out transparent transmission for utilizing the penetrating film set up to the infrared light of the default wave band of vehicle reflection in the first image of current shooting; Or all-pass optical filter, carries out transparent transmission for the light launched vehicle license plate in described first image;
Two optical-filter switcher ICR, is connected with described high-pass filter or described all-pass optical filter, for connecting described high-pass filter or described all-pass optical filter under the control of a processor;
Described processor, be connected with described high-pass filter or described all-pass optical filter, described high-pass filter or described all-pass optical filter is switched to for control ICR, determine that described first image is in infrared mode, and in utilizing described penetrating film to described first image the infrared light of default wave band of vehicle reflection carry out transparent transmission or utilize described all-pass optical filter to described first image in after the light of vehicle reflection carries out transparent transmission, know information according to the first kind board prestored to identify the car plate of vehicle in described first image, wherein, the content that described first kind board knows information shown on the car plate to vehicle in described first image taken under described infrared mode identifies.
2. device according to claim 1, it is characterized in that, described processor, also for according to the yield value of therein and the comparative result of the first predetermined threshold value and by light sensors sense to illumination brightness and the comparative result of the second predetermined threshold value determine enter Night or enter day mode.
3. device according to claim 2, it is characterized in that, described processor, also for when determining to enter described Night, stepper motor is chosen the first universal input/output GPIO pin be communicated with described high-pass filter or described all-pass optical filter, and exports high level pulse signal by a described GPIO pin and control described ICR and switch to described high-pass filter or described all-pass optical filter.
4. device according to claim 2, is characterized in that, described device also comprises:
Low pass filter, for filtering the infrared light of vehicle reflection in the second image of current shooting, wherein, described low pass filter is different from the thickness of described high-pass filter or described all-pass optical filter;
Described processor, be connected with described low pass filter, also control described ICR switch to described low pass filter for being exported high level pulse signal by the 2nd GPIO pin be communicated with described low pass filter chosen on stepper motor, determine that described second image is in non-infrared mode.
5. device according to claim 4, it is characterized in that, described processor, also for knowing information according to the Equations of The Second Kind board prestored, the car plate of vehicle in described second image is identified, wherein, the content that described Equations of The Second Kind board knows information shown on the car plate to vehicle in described second image taken under described non-infrared mode identifies.
6. for a video camera for Car license recognition, it is characterized in that, described video camera comprises: the recognition device of the car plate according to any one of claim 1 to 5 and non-infrared lens.
7. the system for Car license recognition, it is characterized in that, described system comprises: the video camera for Car license recognition according to claim 6 and infrared light compensating lamp, and wherein, described video camera and described infrared light compensating lamp are used in conjunction with each other and identify the displaying contents on car plate.
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| CN201420749653.5U CN204348070U (en) | 2014-12-02 | 2014-12-02 | The recognition device of car plate and video camera, system for Car license recognition |
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| CN201420749653.5U CN204348070U (en) | 2014-12-02 | 2014-12-02 | The recognition device of car plate and video camera, system for Car license recognition |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109475023A (en) * | 2017-09-08 | 2019-03-15 | 深圳市海洋王照明工程有限公司 | Light Control Unit |
| CN111783776A (en) * | 2020-06-30 | 2020-10-16 | 平安国际智慧城市科技股份有限公司 | Character recognition method and device based on real plate and computer equipment |
-
2014
- 2014-12-02 CN CN201420749653.5U patent/CN204348070U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109475023A (en) * | 2017-09-08 | 2019-03-15 | 深圳市海洋王照明工程有限公司 | Light Control Unit |
| CN109475023B (en) * | 2017-09-08 | 2021-07-06 | 深圳市海洋王照明工程有限公司 | Light control device |
| CN111783776A (en) * | 2020-06-30 | 2020-10-16 | 平安国际智慧城市科技股份有限公司 | Character recognition method and device based on real plate and computer equipment |
| CN111783776B (en) * | 2020-06-30 | 2022-09-09 | 平安国际智慧城市科技股份有限公司 | Character recognition method and device based on real plate and computer equipment |
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