CN110837826B - License plate recognition method and related device based on self-adaptive strong light irradiation - Google Patents
License plate recognition method and related device based on self-adaptive strong light irradiation Download PDFInfo
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- CN110837826B CN110837826B CN201911017202.6A CN201911017202A CN110837826B CN 110837826 B CN110837826 B CN 110837826B CN 201911017202 A CN201911017202 A CN 201911017202A CN 110837826 B CN110837826 B CN 110837826B
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000001502 supplementing effect Effects 0.000 claims abstract description 24
- 230000003044 adaptive effect Effects 0.000 claims description 25
- 230000004313 glare Effects 0.000 claims description 13
- 238000011084 recovery Methods 0.000 claims description 6
- 238000005286 illumination Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/141—Control of illumination
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/60—Type of objects
- G06V20/62—Text, e.g. of license plates, overlay texts or captions on TV images
- G06V20/63—Scene text, e.g. street names
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/60—Type of objects
- G06V20/62—Text, e.g. of license plates, overlay texts or captions on TV images
- G06V20/625—License plates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Traffic Control Systems (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
The invention discloses a license plate recognition method and a related device for self-adaptive strong light irradiation, and relates to the technical field of image recognition. The method comprises the following steps: acquiring a vehicle image; carrying out regional processing on the vehicle image to form a plurality of subregions; counting the brightness average value of each subarea; judging whether the brightness average value of each subarea exceeds a preset threshold value or not; if the brightness of the light supplementing lamp panel exceeds the preset brightness value, the gain and the exposure time of the camera are reduced, and the brightness of the light supplementing lamp panel is controlled to be increased; and identifying the license plate in the vehicle image. The invention can automatically judge the strong light irradiation, automatically reduce the gain and exposure time parameters of the camera under the strong light irradiation, and avoid the situation that the license plate cannot be identified due to the overexposure of the image. Meanwhile, the brightness of the light supplementing lamp panel is controlled to be high, so that the light reflection of the license plate is enhanced, and the license plate in the image can be conveniently identified.
Description
Technical Field
The invention relates to the technical field of image recognition, in particular to a license plate recognition method and a related device for self-adaptive strong light irradiation.
Background
The license plate number of the vehicle is a unique identity mark of the vehicle, and the license plate recognition technology can realize automatic registration and verification of the identity of the vehicle under the condition that the vehicle is not changed, and the technology is already applied to various occasions such as road charging, parking management, weighing systems, traffic guidance, traffic law enforcement, road inspection, vehicle dispatching, vehicle detection and the like.
The traditional license plate recognition adopts a camera to shoot and recognize the license plate, but in a direct scene of strong light (car light or backlight and the like), gain must be reduced in order to recognize the license plate, and thus the ambient brightness around the vehicle is reduced. When strong light is strong enough, the surrounding environment of the vehicle cannot be clearly seen, and normal monitoring of the surrounding environment cannot be considered.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a license plate recognition method and a related device capable of self-adapting to strong light irradiation, which can automatically adjust gain and exposure time parameters of a camera under the strong light irradiation, so as to facilitate recognition of a license plate.
In a first aspect, an embodiment of the present invention provides a license plate recognition method with adaptive strong light irradiation, the method including:
acquiring a vehicle image;
carrying out regional processing on the vehicle image to form a plurality of subregions;
counting the brightness average value of each subarea;
judging whether the brightness average value of each subarea exceeds a preset threshold value or not;
if the brightness of the light supplementing lamp panel exceeds the preset brightness value, the gain and the exposure time of the camera are reduced, and the brightness of the light supplementing lamp panel is controlled to be increased;
and identifying the license plate in the vehicle image.
The license plate recognition method of the self-adaptive strong light irradiation has at least the following beneficial effects: the method can automatically judge the strong light irradiation, automatically reduce the gain and exposure time parameters of the camera under the strong light irradiation, and avoid the situation that license plates cannot be identified due to overexposure of images. Meanwhile, the brightness of the light supplementing lamp panel is controlled to be high, so that the light reflection of the license plate is enhanced, and the license plate in the image can be conveniently identified.
Methods for license plate recognition with adaptive glare according to further embodiments of the present invention, the methods further comprising:
judging whether the number of subareas with the average brightness exceeding the preset threshold exceeds the preset number or not;
if the brightness of the light supplementing lamp panel exceeds the preset brightness value, the gain and the exposure time of the camera are reduced, and the brightness of the light supplementing lamp panel is controlled to be increased.
Methods for license plate recognition with adaptive glare according to further embodiments of the present invention, the methods further comprising:
if the license plate in the vehicle image is identified, maintaining the current gain and exposure time of the camera until the vehicle leaves the preset time and then returns to the normal value.
Methods for license plate recognition with adaptive glare according to further embodiments of the present invention, the methods further comprising:
if no license plate in the vehicle image is recognized within the preset time, the gain and the exposure time of the camera are restored to normal values.
In a second aspect, an embodiment of the present invention provides a license plate recognition device with adaptive strong light irradiation, including:
the acquisition module is used for acquiring the vehicle image;
the processing module is used for carrying out regional processing on the vehicle image to form a plurality of subareas;
the statistics module is used for counting the brightness average value of each subarea;
the first judging module is used for judging whether the brightness average value of each subarea exceeds a preset threshold value;
the first control module is used for reducing the gain and the exposure time of the camera if the gain and the exposure time exceed the first control module and controlling the brightness of the light supplementing lamp panel to be increased;
and the identification module is used for identifying the license plate in the vehicle image.
According to further embodiments of the present invention, a license plate recognition device for adaptive glare, the device further comprising:
the second judging module is used for judging whether the number of the subareas with the average brightness value exceeding the preset threshold exceeds the preset number;
and the second control module is used for reducing the gain and the exposure time of the camera if the gain and the exposure time of the camera are exceeded, and controlling the brightness of the light supplementing lamp panel to be increased.
According to further embodiments of the present invention, a license plate recognition device for adaptive glare, the device further comprising:
and the first recovery module is used for maintaining the current gain and the exposure time of the camera if the license plate in the vehicle image is identified, and recovering the vehicle to a normal value after the vehicle leaves the preset time.
According to further embodiments of the present invention, a license plate recognition device for adaptive glare, the device further comprising:
and the second recovery module is used for recovering the gain and the exposure time of the camera to normal values if the license plate in the vehicle image is not recognized within the preset time.
In a third aspect, an embodiment of the present invention provides a license plate recognition control device for adaptive strong light irradiation, including:
at least one processor, and,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform an adaptive glare license plate recognition method as described above.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions for causing a computer to perform a license plate recognition method of adaptive glare as described above.
Drawings
FIG. 1 is a flowchart of a license plate recognition method with adaptive strong light illumination according to an embodiment of the present invention;
fig. 2 is a flowchart of another embodiment of a license plate recognition method with adaptive strong light irradiation according to an embodiment of the present invention.
Detailed Description
The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, if an orientation description such as "upper", "lower", "front", "rear", "left", "right", etc. is referred to, it is merely for convenience of description and simplification of the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention. If a feature is referred to as being "disposed," "secured," "connected," or "mounted" on another feature, it can be directly disposed, secured, or connected to the other feature or be indirectly disposed, secured, connected, or mounted on the other feature.
In the description of the embodiments of the present invention, if "several" is referred to, it means more than one, if "multiple" is referred to, it is understood that the number is not included if "greater than", "less than", "exceeding", and it is understood that the number is included if "above", "below", "within" is referred to. If reference is made to "first", "second" it is to be understood as being used for distinguishing technical features and not as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
Example 1
Referring to fig. 1, a flow chart of a license plate recognition method of adaptive strong light irradiation in the present embodiment is shown.
The method comprises the following steps:
s100, acquiring a vehicle image;
s200, carrying out regional processing on the vehicle image to form a plurality of subregions;
s300, counting the brightness average value of each sub-area;
s400, judging whether the average brightness value of each sub-area exceeds a preset threshold value;
s500, if the brightness of the light supplementing lamp panel exceeds the preset brightness value, the gain and the exposure time of the camera are reduced, and the brightness of the light supplementing lamp panel is controlled to be increased;
s600, identifying license plates in the vehicle images;
s700, if a license plate in a vehicle image is identified, maintaining the current gain and exposure time of the camera until the vehicle leaves for a preset time and then returns to a normal value;
s800, if no license plate in the vehicle image is recognized within the preset time, the gain and the exposure time of the camera are restored to normal values.
By combining the steps, the camera acquires the vehicle image of the past vehicle in real time, and when no vehicle passes through, the gain and exposure time parameters of the camera are set to normal values (the gain and exposure time parameters are higher at the moment), so that the surrounding environment can be clearly monitored and observed by utilizing the image acquired by the camera.
When a vehicle passes through, if the vehicle lamp of the vehicle is in an on state, namely under the condition of strong light irradiation, after the system detects the strong light, the gain and the exposure time parameters of the camera are automatically reduced, so that the license plate in the image can be conveniently identified. Specifically, the process of detecting strong light is: after the vehicle image acquired by the camera is acquired, the vehicle image is subjected to regional processing and divided into a plurality of subareas, the brightness average value of each subarea is counted, whether the brightness average value of each subarea exceeds a preset threshold value is judged, and if the brightness average value exceeds the preset threshold value, the fact that the vehicle passes possibly is indicated. At the moment, the gain and exposure time parameters of the camera are reduced, so that the brightness of the image acquired by the camera is reduced, and the situation that a license plate cannot be identified due to overexposure of the image is avoided. Meanwhile, the brightness of the light supplementing lamp panel is controlled to be high, so that the light reflection of the license plate is enhanced, and the license plate in the image can be conveniently identified.
Taking the example of dividing the vehicle image into 17×15 sub-areas, the luminance average value of each sub-area is calculated (the luminance value of one pixel is 255 at the maximum, and assuming that each sub-area has 8064 pixels, the luminance average value of the sub-area is the sum of the luminance values of the 8064 pixels divided by 8064). When the average brightness value exceeds a preset threshold value, limiting the gain parameter of the camera to 32 times, limiting the exposure time parameter to 1ms, and controlling the brightness of the light supplementing lamp panel to be higher so as to conveniently identify the license plate in the vehicle image.
After the license plate is identified, if the license plate in the vehicle image is identified, the current gain and exposure time parameters of the camera are maintained unchanged until the vehicle is detected to leave the preset time (15 s in the embodiment) and then restored to the normal value. The purpose is that: because the gain parameter of the camera needs a certain time to adjust, the too small focal length (4 mm or below) of the lens or the too fast speed (more than 40 km/h) of the vehicle is avoided, the license plate is possibly not recognized, and the vehicle leaves the monitoring area of the camera.
If no license plate in the vehicle image is recognized within the preset time (15 s in the embodiment), the gain and exposure time parameters of the camera are restored to normal values possibly due to misjudgment caused by that other light sources (such as a flashlight) enter the monitoring range of the camera, and no vehicle passes.
Example two
Referring to fig. 2, based on the first embodiment, the license plate recognition method of the adaptive strong light irradiation in the present embodiment further includes the steps between step S400 and step S500:
s401, judging whether the number of subareas with the brightness average value exceeding a preset threshold exceeds the preset number;
s402, if the brightness of the light supplementing lamp panel exceeds the preset brightness value, the gains and the exposure time of the cameras are reduced, and the brightness of the light supplementing lamp panel is controlled to be increased.
In this embodiment, taking the example of dividing the vehicle image into 17×15 sub-areas, the luminance average value of each sub-area is calculated (the luminance value of one pixel is 255 at the maximum, and assuming that each sub-area has 8064 pixels, the luminance average value of the sub-area is the sum of the luminance values of the 8064 pixels divided by 8064). Only when the number of sub-areas with the average brightness value exceeding the preset threshold exceeds the preset number (9 in the embodiment, normally, too many sub-areas with the average brightness value exceeding the preset threshold will not be influenced by the average brightness value of 1-2 sub-areas even if the street lamp irradiates, the gain parameter of the camera is limited to 32 times, the exposure time parameter is limited to 1ms, and the brightness of the light supplementing lamp panel is controlled to be increased so as to conveniently identify the license plate in the vehicle image, and the stability and accuracy of the system are improved.
Example III
The embodiment provides a license plate recognition device of self-adaptation highlight illumination, and the device includes:
the acquisition module is used for acquiring the vehicle image;
the processing module is used for carrying out regional processing on the vehicle image to form a plurality of subregions;
the statistics module is used for counting the brightness average value of each sub-area;
the first judging module is used for judging whether the brightness average value of each sub-area exceeds a preset threshold value;
the first control module is used for reducing the gain and the exposure time of the camera if the gain and the exposure time exceed the first control module and controlling the brightness of the light supplementing lamp panel to be increased;
the identification module is used for identifying license plates in the vehicle images;
and the first recovery module is used for maintaining the current gain and the exposure time of the camera if the license plate in the vehicle image is identified, and recovering the vehicle to a normal value after the vehicle leaves the preset time.
And the second recovery module is used for recovering the gain and the exposure time of the camera to normal values if the license plate in the vehicle image is not recognized within the preset time.
The working process of the license plate recognition device with adaptive strong light irradiation in this embodiment refers to the description of the license plate recognition method with adaptive strong light irradiation in the first embodiment, and is not repeated here.
Example IV
Based on the third embodiment, the license plate recognition device of the adaptive strong light irradiation in this embodiment further includes:
the second judging module is used for judging whether the number of the subareas with the brightness average value exceeding a preset threshold exceeds a preset number;
and the second control module is used for reducing the gain and the exposure time of the camera if the gain and the exposure time of the camera are exceeded and controlling the brightness of the light supplementing lamp panel to be increased.
The working process of the license plate recognition device with adaptive strong light irradiation in this embodiment refers to the description of the license plate recognition method with adaptive strong light irradiation in the second embodiment, and is not repeated here.
Example five
The embodiment provides a license plate recognition control device of self-adaptation highlight illumination, includes:
at least one processor, and,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the adaptive glare license plate recognition method described in embodiments one and two.
Example six
The present embodiment provides a computer-readable storage medium storing computer-executable instructions for causing a computer to execute the license plate recognition method of adaptive glare described in embodiment one and embodiment two.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Claims (4)
1. A license plate recognition method of self-adaptive strong light irradiation, the method comprising:
acquiring a vehicle image acquired by a camera;
carrying out regional processing on the vehicle image to form a plurality of subregions;
counting the brightness average value of each subarea;
judging whether the brightness average value of each subarea exceeds a preset threshold value or not; if the gain parameter exceeds the preset threshold, limiting the gain parameter of the camera to 32 times, limiting the exposure time of the camera to 1ms, and controlling the brightness of the light supplementing lamp panel to be high;
judging whether the number of subareas with the average brightness exceeding the preset threshold exceeds the preset number or not; if the brightness of the light supplementing lamp panel exceeds the preset brightness value, the gain and the exposure time of the camera are reduced, and the brightness of the light supplementing lamp panel is controlled to be increased;
identifying a license plate in the vehicle image;
if the license plate in the vehicle image is identified, maintaining the current gain and exposure time of the camera until the vehicle leaves the preset time and then returns to the normal value;
if no license plate in the vehicle image is recognized within the preset time, the gain and the exposure time of the camera are restored to normal values.
2. A license plate recognition device of self-adaptation highlight illumination, characterized by comprising:
the acquisition module is used for acquiring the vehicle image acquired by the camera;
the processing module is used for carrying out regional processing on the vehicle image to form a plurality of subareas;
the statistics module is used for counting the brightness average value of each subarea;
the first judging module is used for judging whether the brightness average value of each subarea exceeds a preset threshold value;
the first control module is used for limiting the gain parameter of the camera to 32 times if the gain parameter exceeds the gain parameter, limiting the exposure time of the camera to 1ms and controlling the brightness of the light supplementing lamp panel to be higher;
the identification module is used for identifying license plates in the vehicle image;
the second judging module is used for judging whether the number of the subareas with the average brightness value exceeding the preset threshold exceeds the preset number;
the second control module is used for reducing the gain and the exposure time of the camera and controlling the brightness of the light supplementing lamp panel to be increased if the gain and the exposure time of the camera exceed the first control module;
the first recovery module is used for maintaining the current gain and exposure time of the camera if the license plate in the vehicle image is identified, and recovering the license plate to a normal value after the vehicle leaves the preset time;
and the second recovery module is used for recovering the gain and the exposure time of the camera to normal values if the license plate in the vehicle image is not recognized within the preset time.
3. A license plate recognition control device for adaptive glare irradiation, comprising:
at least one processor, and,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a license plate recognition method of adaptive glare according to claim 1.
4. A computer-readable storage medium storing computer-executable instructions for causing a computer to perform a license plate recognition method of adaptive glare according to claim 1.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111491103B (en) * | 2020-04-23 | 2021-10-15 | 浙江大华技术股份有限公司 | Image brightness adjusting method, monitoring equipment and storage medium |
| CN111754440B (en) * | 2020-06-29 | 2023-05-05 | 苏州科达科技股份有限公司 | License plate image enhancement method, system, equipment and storage medium |
| CN112291481B (en) * | 2020-10-30 | 2022-05-03 | 重庆紫光华山智安科技有限公司 | Exposure automatic adjusting method and device, electronic equipment and storage medium |
| CN112733827B (en) * | 2020-12-29 | 2023-08-04 | 深圳市天视通视觉有限公司 | License plate recognition method and device, electronic equipment and storage medium |
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