CN103327258A - License plate camera device and method for adjusting image exposure - Google Patents
License plate camera device and method for adjusting image exposure Download PDFInfo
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- CN103327258A CN103327258A CN2012100757629A CN201210075762A CN103327258A CN 103327258 A CN103327258 A CN 103327258A CN 2012100757629 A CN2012100757629 A CN 2012100757629A CN 201210075762 A CN201210075762 A CN 201210075762A CN 103327258 A CN103327258 A CN 103327258A
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Abstract
The invention discloses a license plate camera device and an image exposure adjusting method thereof. The license plate camera device shoots a scene, and the license plate camera device comprises: an image sensing module, an identification module and a processing module. The image sensing module senses a scene to generate an image. The identification module identifies at least one vehicle object from the image. The processing module carries out exposure adjustment on each vehicle object to respectively generate an exposure adjustment vehicle object, the identification module identifies a license plate object from each exposure adjustment vehicle object, and the processing module carries out exposure adjustment on each license plate object.
Description
Technical field
The invention relates to a kind of car plate camera head and image exposure method of adjustment thereof, particularly relevant for car plate camera head and the image exposure method of adjustment thereof of indivedual car plate images being exposed respectively adjusting.
Background technology
Handle a case and contain general mood day along with science, many vehicles accident cases that betide in the big city all can be put attribution of liability in order by making video recording of crossing monitor.Yet the density of setting of monitor is limited after all, still possibly can't know in some cases the image of the lower scene of the accident of record.In addition, in case vehicle enters suburb or scenic spot, the setting of monitor is rare especially, just in case have an accident, only can by the appreciation personnel afterwards field investigation put traffic accident responsibility in order.Therefore, more and more many people select to install additional drive recorder in car, can ensure the legal right of oneself at crucial moment.Generally speaking drive recorder has photologging and memory function, even part also has function of radio receiver.
When accident occured, the image reproduction by drive recorder can help the police or relevant unit to understand actual state, also can be according to license board information in the image, chase the troublemaker with hunting, and present license board information for clear, the part drive recorder utilizes the automatic exposure adjustment to achieve the goal.But, module is adjusted in the automatic exposure of part drive recorder now, the brightness that mostly utilizes whole image is for reference data or utilize high dynamic range imaging (High Dynamic Range Imaging, HDRI) mode, to the image adjustment that exposes, but often quick because of environmental change, so that effect is limited.
In view of this, how to design desirable car plate camera head and an image exposure method of adjustment thereof, present the car plate image to reach clear, become the instant subject under discussion in the practical application.Be indebted to pixel sensing and detecting type complementary metal oxide semiconductor element (pixel-based complementary metal-oxide-semiconductor sensor, pixel-based CMOS sensor) development of technology, the present inventor's thinking also designs a kind of car plate camera head and image exposure method of adjustment thereof, improved with the disappearance for prior art, and then the enforcement utilization on the enhancement industry.
Summary of the invention
Because above-mentioned known technology problem, purpose of the present invention is providing a kind of car plate camera head and image exposure method of adjustment thereof exactly, to reach the effect that indivedual car plates are exposed and adjust.
For achieving the above object, the present invention by the following technical solutions: a kind of car plate camera head, to take a scene, it comprises: an image sensing module, an identification module and are processed module.The image sensing module carries out sensing to scene, to produce an image.At least one vehicle item of identification module identification from image.Process module to adjustments that expose of each vehicle item, adjust vehicle item to produce respectively an exposure, the identification module is adjusted identification one car plate object vehicle item from each exposure again, and the processing module is again to the adjustment that exposes of each car plate object.
Wherein, the image sensing module can be a pixel sensing and detecting type cmos device (pixel-based complementary metal-oxide-semiconductor sensor, pixel-based CMOS sensor).
Wherein, the car plate camera head also comprises a photometry module, and scene is carried out photometry, producing image exposure data, and each car plate object is carried out photometry, to produce respectively a car plate exposure data, and photometry is carried out in the zone to non-each car plate object in the scene, to produce regional exposure data.
Wherein, process module according to image exposure data, each car plate exposure data and regional exposure data, to the image adjustment that exposes.
Wherein, according to each car plate object vary in size or position in scene different, each car plate exposure data has different weighted values.
According to another object of the present invention, an image exposure method of adjustment is proposed, comprise the following step: provide an image sensing module that one scene is carried out sensing, to produce an image; By at least one vehicle item of identification module identification from image; Process module to adjustments that expose of each vehicle item, to produce respectively an exposure adjustment vehicle item by one; Adjust identification one car plate object the vehicle item by the identification module from each exposure; By processing module to the adjustment that exposes of each car plate object.
Wherein, the image sensing module can comprise a pixel sensing and detecting type complementary metal oxide semiconductor element (pixel-based complementary metal-oxide-semiconductor sensor, pixel-based CMOS sensor).
Wherein, the image exposure method of adjustment also comprises the following step: a photometry module is provided, scene is carried out photometry, to produce image exposure data; By the photometry module, each car plate object is carried out photometry, to produce a car plate exposure data; And by the photometry module, photometry is carried out in the zone of non-car plate object in the scene, to produce regional exposure data; By processing module according to image exposure data, each car plate exposure data and regional exposure data, to the image adjustment that exposes.
Wherein, according to each car plate object vary in size or position in scene different, each car plate exposure data has different weighted values.
According to a further object of the present invention, a kind of car plate camera head is proposed, to take a scene, it comprises: a photo-sensitive cell, an image processing module, an identification module and are processed module.Photo-sensitive cell carries out sensing to a scene, to produce a sensing signal.The image processing module is according to the sensing signal, to produce an image.At least one vehicle item of identification module identification from image.Process module to adjustments that expose of each vehicle item, adjust vehicle item to produce respectively an exposure, the identification module is adjusted identification one car plate object vehicle item from each exposure again, and the processing module is again to the adjustment that exposes of each car plate object.
Wherein, Image Sensor can be a pixel sensing and detecting type cmos device (pixel-based complementary metal-oxide-semiconductor sensor, pixel-based CMOS sensor).
Wherein, the car plate camera head also comprises a photometry module, and scene is carried out photometry, producing image exposure data, and each car plate object is carried out photometry, to produce respectively a car plate exposure data, and photometry is carried out in the zone to non-each car plate object in the scene, to produce regional exposure data.
Wherein, process module according to image exposure data, each car plate exposure data and regional exposure data, to the image adjustment that exposes.
Wherein according to each car plate object vary in size or position in scene different, each car plate exposure data has different weighted values.
From the above, according to car plate camera head of the present invention and image exposure method of adjustment thereof, it can have one or more following advantage:
(1) car plate camera head of the present invention and image exposure method of adjustment thereof are by the exposure information of each object in the image, so that each car plate in the image is carried out the multiexposure, multiple exposure adjustment, so that each license board information is easier of identification.
(2) car plate camera head of the present invention and image exposure method of adjustment thereof, photometry is carried out in zone to non-vehicle item in whole image, each vehicle item, each car plate object and the scene, and cooperate different weighted values, with the adjustment that exposed in the zone of non-vehicle item in the image, image is known presented actual road conditions.
Description of drawings
Fig. 1 is the calcspar of car plate camera head of the present invention.
Fig. 2 is the calcspar of the first embodiment of car plate camera head of the present invention.
Fig. 3 is the first schematic diagram of the first embodiment of car plate camera head of the present invention.
Fig. 4 is the second schematic diagram of the first embodiment of car plate camera head of the present invention.
Fig. 5 is the flow chart of image exposure method of adjustment of the present invention.
Fig. 6 is the schematic diagram of the embodiment of image exposure method of adjustment of the present invention.
Embodiment
The effect of understanding technical characterictic of the present invention, content and advantage and reaching for the expensive auditor of profit, below the present invention is cooperated accompanying drawing, and describe in detail with the expression-form of embodiment, and employed accompanying drawing wherein, its purport only is the usefulness of signal and aid illustration book, may not be the true ratio after the invention process and precisely configuration, therefore should not understand, limit the invention to the interest field in the actual enforcement, in advance statement with regard to ratio and the configuration relation of accompanying drawing.
Hereinafter with reference to relevant drawings, the embodiment according to car plate camera head of the present invention and image exposure method of adjustment thereof is described, to be convenient to understand for making, the similar elements among the following embodiment illustrates with identical symbology.
See also Fig. 1, it is the calcspar of car plate camera head of the present invention.As shown in the figure, car plate camera head 10 is taken a scene 20, and it comprises: an image sensing module 11, an identification module 12 and are processed module 13.11 pairs of scenes of image sensing module 20 are carried out sensing, to produce an image 111.At least one vehicle item 112 of identification module 12 identification from image 111.Process adjustments that expose of 13 pairs of each vehicle item 112 of module, to produce respectively an exposure adjustment vehicle item 131.Identification module 12 is adjusted identification one car plate object 113 vehicle item 131 from each exposure, processes module 13 again to the adjustment that exposes respectively of each car plate object 113.Wherein identification module 12 can be Digital System Processor (digital signal processor, DSP); Process module 13 and can be central processing unit (central processing unit, CPU) or microprocessor (micro processor).In other words, car plate camera head 10 of the present invention can be to each car plate object 113, adjustment exposes respectively, so that image 111 can clearlyer present the actual conditions of each car plate object 113, improve the picture pick-up device that in the past is applied to moving carrier with this, to view picture image 111 adjustment that exposes, make the license board information can't be effectively by the disappearance of identification.
See also Fig. 2, Fig. 3 and Fig. 4.Fig. 2 is the calcspar of the first embodiment of car plate camera head of the present invention; Fig. 3 is the first schematic diagram of the first embodiment of car plate camera head of the present invention; Fig. 4 is the second schematic diagram of the first embodiment of car plate camera head of the present invention.Car plate camera head 10 can be applicable to a moving carrier 40, with as one the driving register 30.As shown in Figures 2 and 3, drive recorder 30 comprises a car plate camera head 10 and display unit 21.Car plate camera head 10 is electrically connected display unit 21.Wherein display unit 21 can be designed to one-body molded according to practical application and car plate camera head 10.Drive recorder 30 utilizes car plate camera head 10 sensing scenes 20 to produce an image 111, and image 111 is shown in a display screen 211 of display unit 21 after exposure adjustment processing.Car plate camera head 10 comprises: an image sensing module 11, an identification module 12, are processed module 13 and photometry module 14.Image sensing module 11 sensings one scene 20 is to produce an image 111.Wherein image sensing module 11 can comprise camera lens, photo-sensitive cell such as pixel sensing and detecting type cmos device (pixel-based complementary metal-oxide-semiconductor sensor, pixel-based CMOS sensor), analogy/digit circuit, image processing element etc.Each vehicle item 112 and car plate object 113 thereof in the identification module 12 identification images 111.Photometry is carried out in the zone of non-vehicle item 112 in 14 pairs of images 111 of photometry module, each car plate object 113, each vehicle item 112 and the image 111, to produce respectively image exposure data 141, a car plate exposure data 142, regional exposure data 143 and a vehicle exposure data 144.Process module 13 according to the adjustment that exposes respectively of 142 pairs of each car plate objects 113 of each car plate exposure data, and according to the adjustment that exposes of the zone of non-vehicle item 112 in exposed image data 141, regional exposure data 143 and 144 pairs of images 111 of vehicle exposure data.Wherein, each car plate exposure data 142 is different according to the position in image 111, and has different weighted values.
See also Fig. 4, specifically, suppose (scene 20) A of having car near and far on the road, B car and C car (vehicle item 112), image sensing module 11 sensing scenes 20 are to produce image 111.14 pairs of images of photometry module 111 carry out photometry, to produce image exposure data 141.A car, B car and C car in the identification module 12 identification images 111, and respectively identification A car plate, B car plate and C car plate (car plate object 113) from each vehicle.14 pairs of A cars of photometry module, B car and C car and car plate thereof carry out photometry, producing each car plate exposure data 142 and each vehicle exposure object data 144, and photometry are carried out in the zone outside A car, B car and the C car in the scene 20, to produce regional exposure data 143.Process module 13 according to each car plate exposure data 142, to the adjustment that exposes of each car plate object 113.Wherein according to the different or big or small difference of the position of each car plate object 113, each car plate exposure data 142 has different weighted values, and namely the A car plate has higher weighted value with respect to the C car plate.Process module 13 according to the adjustment that exposes of the zone of non-vehicle item 112 in image exposure data 141, regional exposure data 143 and 144 pairs of images 111 of vehicle exposure data.Wherein, image exposure data 141 have lower weighted value compared to regional exposure data 143, can adjust according to practical application request the proportion of weighted value.In addition, for making each car plate in the shown image 111 easier of identification, can carry out the re-expose adjustment to car plate object 113.In more detail, identification module 12 is each vehicle item 112 of identification from image 111, process module 13 first respectively to adjustments (car plate object 113 is done for the first time exposure and adjusted) that expose individually of each vehicle item 112, and produce respectively an exposure adjustment vehicle item 131; Identification module 12 is adjusted each car plate object 113 of identification the vehicle item 131 from each exposure, and carries out respectively the exposure adjustment second time by processing 13 pairs of each car plate objects 113 of module.
In brief, car plate camera head 10 is by the exposure data (such as aperture size, time for exposure or exposure value (Exposure Value)) of each object (car plate object 113 and vehicle item 112) in photometry module 14 pick-up images 111, to carry out indivedual exposure value adjustment for each car plate object 113, and by image exposure data 141, regional exposure data 143 and vehicle exposure data 144, the exposure value adjustment is carried out in the zone of non-vehicle item 112 in the image 111.Wherein, exposed when adjusting in the zone of non-vehicle item 112, also can add each car plate exposure data 142 and distribute by weighted value, so that image 111 presents actual road conditions more accurately.
See also Fig. 5, it is the flow chart of image exposure method of adjustment of the present invention.The image exposure method of adjustment can be applicable to a car plate camera head 10, and it comprises the following step:
Step S51 provides an image sensing module, and a scene is carried out sensing to produce an image;
Step S52, by an identification module, at least one vehicle item of identification from image;
Step S53 processes module by one, to adjustments that expose of each vehicle item, to produce respectively an exposure adjustment vehicle item;
Step S54 adjusts identification car plate object the vehicle item by the identification module from each exposure; And
Step S55 is by processing module to the adjustment that exposes of each car plate object.
Described when the detailed description of the image exposure method of adjustment of the present embodiment and execution mode have been narrated car plate camera head of the present invention in the front, just no longer narrated for schematic illustration at this.
See also Fig. 6, it is the flow chart of the embodiment of image exposure method of adjustment of the present invention.The image exposure method of adjustment can be applicable to a car plate camera head 10, and it comprises the following step:
Step S61 provides an image sensing module, and a scene is carried out sensing to produce an image;
Step S62 is by at least one vehicle item of identification module identification from image;
Step S63 carries out photometry by a photometry module to each vehicle item, to produce respectively a vehicle exposure data;
Step S64 processes module according to each vehicle exposure data by one, to adjustments that expose of each vehicle item, to produce respectively the adjustment vehicle item of exposing;
Step S65 adjusts each car plate object of identification the vehicle item by the identification module from each exposure;
Step S66 by the photometry module, carries out photometry to each car plate object, to produce a car plate exposure data;
Step S67 is by processing module according to each car plate exposure data, to the adjustment that exposes of each car plate object;
Step S68 carries out photometry by the photometry module to the zone of non-vehicle item in scene and the scene, to produce image exposure data and regional exposure data; And
Step S69 is by processing module according to image exposure data, vehicle exposure data and regional exposure data, to the adjustment that exposes of the zone of non-car plate object in the image.
The above only is illustrative, but not is restricted person.Anyly do not break away from spirit of the present invention and category, and to its equivalent modifications of carrying out or change, all should be contained in the accompanying claim scope.
Claims (14)
1. a car plate camera head is taken a scene, it is characterized in that, it comprises:
One image sensing module carries out sensing to described scene, to produce an image;
One identification module, at least one vehicle item of identification from described image; And
One processes module, to the adjustment that exposes of each described vehicle item, adjust vehicle item to produce respectively an exposure, described identification module is adjusted identification one car plate object vehicle item from each described exposure again, and described processing module is again to the adjustment that exposes of each described car plate object.
2. car plate camera head as claimed in claim 1 is characterized in that, described image sensing module is a pixel sensing and detecting type cmos device.
3. car plate camera head as claimed in claim 1, it is characterized in that, described car plate camera head also comprises a photometry module, described scene is carried out photometry, producing image exposure data, and each described car plate object is carried out photometry, to produce respectively a car plate exposure data, and photometry is carried out in the zone to non-each described car plate object in the described scene, to produce regional exposure data.
4. car plate camera head as claimed in claim 3 is characterized in that, described processing module is according to described image exposure data, each described car plate exposure data and described regional exposure data, to the adjustment that exposes of described image.
5. car plate camera head as claimed in claim 4 is characterized in that, according to each described car plate object vary in size or position in described scene different, each described car plate exposure data has different weighted values.
6. an image exposure method of adjustment is characterized in that, comprises the following step:
By an image sensing module one scene is carried out sensing, to produce an image;
By an identification module, at least one vehicle item of identification from described image;
Process module by one, to adjustments that expose of each described vehicle item, to produce respectively an exposure adjustment vehicle item;
Adjust identification one car plate object the vehicle item by described identification module from each described exposure; And
By described processing module to the adjustment that exposes of each described car plate object.
7. image exposure method of adjustment as claimed in claim 6 is characterized in that, described image sensing module is a pixel sensing and detecting type complementary metal oxide semiconductor element.
8. image exposure method of adjustment as claimed in claim 6 is characterized in that, also comprises the following step:
One photometry module is provided, described scene is carried out photometry, to produce image exposure data;
By described photometry module, each described car plate object is carried out photometry, to produce a car plate exposure data;
By described photometry module, photometry is carried out in the zone of non-described car plate object in the described scene, to produce regional exposure data; And
By described processing module according to described image exposure data, each described car plate exposure data and described regional exposure data, to the adjustment that exposes of described image.
9. image exposure method of adjustment as claimed in claim 8 is characterized in that, according to each described car plate object vary in size or position in described scene different, each described car plate exposure data has different weighted values.
10. a car plate camera head is taken a scene, it is characterized in that, comprises:
One photo-sensitive cell carries out sensing to described scene, to produce a sensing signal;
One image processing module is according to described sensing signal, to produce an image;
One identification module, at least one vehicle item of identification from described image; And
One processes module, to the adjustment that exposes of each described vehicle item, adjust vehicle item to produce respectively an exposure, described identification module is adjusted identification one car plate object vehicle item from each described exposure again, and described processing module is again to the adjustment that exposes of each described car plate object.
11. car plate camera head as claimed in claim 10 is characterized in that, described photo-sensitive cell is a pixel sensing and detecting type complementary metal oxide semiconductor element.
12. car plate camera head as claimed in claim 10, it is characterized in that, described car plate camera head also comprises a photometry module, described scene is carried out photometry, producing image exposure data, and each described car plate object is carried out photometry, to produce a car plate exposure data, and photometry is carried out in the zone to non-described car plate object in the described scene, to produce regional exposure data.
13. car plate camera head as claimed in claim 12 is characterized in that, described processing module is according to described image exposure data, each described car plate exposure data and described regional exposure data, to the adjustment that exposes of described image.
14. car plate camera head as claimed in claim 13 is characterized in that, according to each described car plate object vary in size or position in described scene different, each described car plate exposure data has different weighted values.
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| CN2012100757629A CN103327258A (en) | 2012-03-21 | 2012-03-21 | License plate camera device and method for adjusting image exposure |
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| CN2012100757629A CN103327258A (en) | 2012-03-21 | 2012-03-21 | License plate camera device and method for adjusting image exposure |
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| CN111491103A (en) * | 2020-04-23 | 2020-08-04 | 浙江大华技术股份有限公司 | Image brightness adjusting method, monitoring equipment and storage medium |
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Application publication date: 20130925 |