CN113269116A - Vehicle charging system based on license plate recognition - Google Patents
Vehicle charging system based on license plate recognition Download PDFInfo
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- CN113269116A CN113269116A CN202110625417.7A CN202110625417A CN113269116A CN 113269116 A CN113269116 A CN 113269116A CN 202110625417 A CN202110625417 A CN 202110625417A CN 113269116 A CN113269116 A CN 113269116A
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- 238000001514 detection method Methods 0.000 claims description 6
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- 230000011218 segmentation Effects 0.000 claims description 4
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 238000009434 installation Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/50—Context or environment of the image
- G06V20/56—Context or environment of the image exterior to a vehicle by using sensors mounted on the vehicle
- G06V20/58—Recognition of moving objects or obstacles, e.g. vehicles or pedestrians; Recognition of traffic objects, e.g. traffic signs, traffic lights or roads
- G06V20/584—Recognition of moving objects or obstacles, e.g. vehicles or pedestrians; Recognition of traffic objects, e.g. traffic signs, traffic lights or roads of vehicle lights or traffic lights
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q20/00—Payment architectures, schemes or protocols
- G06Q20/04—Payment circuits
- G06Q20/06—Private payment circuits, e.g. involving electronic currency used among participants of a common payment scheme
- G06Q20/065—Private payment circuits, e.g. involving electronic currency used among participants of a common payment scheme using e-cash
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q20/00—Payment architectures, schemes or protocols
- G06Q20/08—Payment architectures
- G06Q20/14—Payment architectures specially adapted for billing systems
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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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Abstract
The invention relates to a vehicle charging system based on license plate recognition, which is characterized in that cameras are respectively arranged at an inlet and an outlet of a charging area, license plate numbers are used as unique identification information of vehicles, the vehicles are determined to enter and leave the charging area based on a mature video license plate recognition technology, and then charging and fee deduction are carried out, so that the accuracy and the reliability are greatly improved.
Description
Technical Field
The invention belongs to the technical field of vehicle charging, and particularly relates to a vehicle charging system based on license plate recognition.
Background
At present, for charging when a vehicle enters a charging area (such as an expressway, an airport parking garage or a large commercial parking garage, etc.), a toll station is usually required to be arranged at an entrance and an exit, taking highway charging as an example, the vehicle-mounted electronic tag installed on a vehicle windshield and a microwave antenna on an ETC lane of the toll station are in special short-range communication, so that toll collection is realized without parking.
Disclosure of Invention
Based on this, to the technical problem, provide a vehicle charging system based on license plate discernment that accurate reliable, traffic are efficient.
In order to solve the technical problems, the invention adopts the following technical scheme:
a vehicle charging system based on license plate recognition is characterized by comprising a first camera, a second camera and information processing equipment, wherein the first camera is used for collecting vehicle images at an entrance of a charging area, the second camera is used for collecting vehicle images at an exit of the charging area, the first camera and the second camera are respectively arranged at the entrance and the exit of the charging area, and both the first camera and the second camera are connected with the information processing equipment;
the information processing apparatus is configured to:
identifying a license plate number from the vehicle image collected by the first camera, and determining that the corresponding vehicle enters the charging area;
identifying a license plate number from the vehicle image collected by the second camera, and determining that the corresponding vehicle leaves the charging area;
and when the vehicle entering the charging area leaves the charging area, calculating the cost of the vehicle, and deducting the fee from a corresponding account.
The invention sets up the camera in the entrance and exit of the charging area separately, and regard license plate number as the only identification information of the vehicle, confirm the vehicle enters, leaves the charging area on the basis of the mature video license plate recognition technology, and then carry on the charging and withholding, have greatly improved accuracy and reliability, such a way does not need to set up the toll booth, will not queue up and enter the phenomenon of the charging area again, has raised the efficiency of passing, meanwhile, there is no installation requirement to the vehicle additional equipment, has reduced the burden of the car owner, have wider application range, the license plate number of the noninductive recognition, has promoted the driver's driving and riding experience.
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The invention is described in detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of the present invention.
Detailed Description
As shown in fig. 1, the present specification provides a vehicle toll collection system based on license plate recognition, including a first camera 110 for collecting a vehicle image at an entrance of a toll collection area, a second camera 120 for collecting a vehicle image at an exit of the toll collection area, and an information processing device 130.
As shown in fig. 1 and 2, the first camera 110 and the second camera 120 are respectively disposed at an entrance and an exit of the charging area, and both are connected to the information processing apparatus 130.
The toll area is a highway, an airport parking garage or a large commercial parking garage, etc.
Wherein the information processing apparatus 130 is configured to:
firstly, executing the following image processing analysis flow:
1. the license plate number is recognized from the vehicle image collected by the first camera 110, and it is determined that the corresponding vehicle enters the toll collection area.
2. The license plate number is identified from the vehicle image captured 120 by the second camera, and the corresponding vehicle is determined to leave the toll area.
Secondly, the following charging and fee deducting processes are executed:
when the vehicle entering the charging area leaves the charging area, the cost of the vehicle is calculated, and the corresponding account is deducted. In this embodiment, the online payment platform may be accessed to request to deduct fees from corresponding accounts, and if no corresponding account exists in the online payment platform, the vehicle owner is notified to handle the payment and binding financial account services.
The invention sets up the camera in the entrance and exit of the charging area separately, and regard license plate number as the only identification information of the vehicle, confirm the vehicle enters, leaves the charging area on the basis of the mature video license plate recognition technology, and then carry on the charging and withholding, have greatly improved accuracy and reliability, such a way does not need to set up the toll booth, will not queue up and enter the phenomenon of the charging area again, has raised the efficiency of passing, meanwhile, there is no installation requirement to the vehicle additional equipment, has reduced the burden of the car owner, have wider application range, the license plate number of the noninductive recognition, has promoted the driver's driving and riding experience.
In this embodiment, the toll collection area is an expressway, a plurality of third cameras 140 for collecting vehicle images are further disposed on each road section of the expressway, and each of the plurality of third cameras 140 is connected to the information processing apparatus 130.
Accordingly, in the image processing and analyzing process, the license plate number needs to be identified from the vehicle images collected by the plurality of third cameras 140, the track of the corresponding vehicle on the expressway needs to be determined according to the positions of the plurality of third cameras 140, and when the cost of the vehicle is calculated, the cost of the vehicle needs to be calculated according to the track of the vehicle on the expressway.
The specific process of identifying the license plate number from the vehicle images collected by the plurality of third cameras 140 is as follows:
a. when the vehicle enters the detection range of the third camera 140, the entry time of the vehicle is recorded.
b. From the video stream of the third camera 140, a plurality of vehicle images are cut out from the video stream at a preset speed from the entry time.
An edge line of the detection range of the third camera 140 may be used as a detection line, and a vehicle crossing the detection line may be used as a reference for determining that the vehicle enters the detection range of the third camera 140.
c. And identifying the license plate number from the intercepted vehicle image.
The license plate number is identified from a plurality of vehicle images, so that the identification accuracy can be improved.
Preferably, in the image processing and analyzing process, the number plate numbers identified from the vehicle images collected by the plurality of third cameras 140 are matched with the number plate numbers of the vehicles entering the charging area and not leaving the charging area, and the unmatched number plate numbers are filtered.
In the present embodiment, the image processing analysis process identifies the license plate number from the vehicle image by:
a. preprocessing the vehicle image: and converting the color picture into a gray picture by adopting a weighted average method, preprocessing the gray picture, calculating an edge gradient image, removing image noise data, and obtaining the edge gradient image which contains intermediate data with better characteristics of the license plate region.
b. And performing threshold segmentation on the edge gradient image, distinguishing a candidate license plate region (foreground) and a background, and removing image noise data through a filtering algorithm, such as a morphological filtering algorithm.
c. And extracting a candidate license plate region image from the image after thresholding segmentation.
d. And filtering the false license plate region image to obtain a final license plate region image.
In order to improve the execution efficiency, a line connection method is adopted, a relevance line connection area of a foreground target (license plate) is obtained through calculation according to the characteristics of the distribution relation of horizontal lines, the distribution density of vertical lines and the like, then the license plate area and a fake license plate area are positioned and extracted in a waiting selection area through processing of cluster fitting and the like, then the geometrical characteristics (such as width-to-height ratio and the like) of the license plate are assisted, the fake license plate area is filtered, and a final license plate area image, namely a license plate close-up image, is obtained.
e. And judging whether the number of pixel points occupied by the length direction edge and the width direction edge of the final license plate region image is higher than a threshold value, if so, determining that the license plate region image is an effective license plate region image.
f. And reading the license plate number from the image of the effective license plate area.
As shown in fig. 1 and fig. 2, in an actual application scenario of highway toll collection, the first camera 110 and the second camera 120 are respectively disposed at a charging point a at an entrance and a charging point B at an exit of a highway, and the first camera 110, the second camera 120 and the third camera 140 may be installed at a low position beside a lane or at a high position of a gantry according to field conditions, and the toll collection system works as follows:
1. after the vehicle enters the highway entrance charging point, the first camera 110 collects a vehicle image and sends the vehicle image to the information processing device 130 through the network, and the information processing device 130 identifies a license plate number from the vehicle image and determines that the vehicle enters the highway.
2. During the driving of the vehicle on the highway, the vehicle image is captured by each third camera 140 along the way. For high-speed vehicle snapshot, taking a vehicle speed of 300 kilometers per hour (about 83.4 meters per second), and an effective license plate snapshot range of a license plate recognition camera on a portal frame of 10 meters (a road surface interval capable of clearly shooting a license plate) as an example, in order to improve license plate recognition accuracy, the information processing device 130 intercepts 3 images from a video stream for each vehicle to recognize a license plate number, and it can be known through calculation that the shortest time interval of snapshot of each photo is 0.04 second, and the video interception speed should be 25 frames per second.
The information processing apparatus 130 recognizes the number plate number from the intercepted 3 images of the vehicles and removes the duplicated number plate number, and then compares the recognized number plate number with the number plate that is driven into the high speed and is not driven out of the high speed, and removes the erroneously recognized number plate number, so that the trajectory of each vehicle on the expressway can be determined in combination with the installation position of each third camera 140.
3. After the vehicle enters the highway exit charging point, the second camera 120 collects a vehicle image and sends the vehicle image to the information processing device 130 through the network, and the information processing device 130 identifies the license plate number from the vehicle image and determines that the vehicle leaves the highway.
4. Finally, the information processing apparatus 130 calculates the highway toll based on the trajectory of the vehicle on the highway, and transmits the highway toll request to the online payment mechanism through the communication network.
In this embodiment, the information processing apparatus 130 includes a first information processing device 131 for executing the image processing analysis process and a second information processing device 132 for executing the charging deduction process, the first information processing device 131 is connected to the camera, and the second information processing device 132 is connected to the first information processing device 131.
The first information processing apparatus 131 may be composed of a plurality of image analysis servers, including but not limited to a deployment mode in which a proxy server responds to requests and is responsible for load balancing.
The second information processing apparatus 132 may be composed of a plurality of application servers including, but not limited to, a deployment mode in which a proxy server responds to a request and is responsible for load balancing and a cloud service mode.
It should be noted that the program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
However, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, provided they fall within the true spirit of the present invention.
Claims (9)
1. A vehicle charging system based on license plate recognition is characterized by comprising a first camera, a second camera and information processing equipment, wherein the first camera is used for collecting vehicle images at an entrance of a charging area, the second camera is used for collecting vehicle images at an exit of the charging area, the first camera and the second camera are respectively arranged at the entrance and the exit of the charging area, and both the first camera and the second camera are connected with the information processing equipment;
the information processing apparatus is configured to:
identifying a license plate number from the vehicle image collected by the first camera, and determining that the corresponding vehicle enters the charging area;
identifying a license plate number from the vehicle image collected by the second camera, and determining that the corresponding vehicle leaves the charging area;
and when the vehicle entering the charging area leaves the charging area, calculating the cost of the vehicle, and deducting the fee from a corresponding account.
2. The vehicle charging system based on license plate recognition of claim 1, wherein the charging area is a highway, the system further comprises a plurality of third cameras for collecting vehicle images at each road section of the highway, and the plurality of third cameras are respectively arranged at each road section of the highway and are all connected with the information processing device.
3. The vehicle charging system based on license plate recognition of claim 2, wherein the information processing device is further configured to:
and identifying the license plate number from the vehicle images collected by the plurality of third cameras, and determining the track of the corresponding vehicle on the expressway according to the positions of the plurality of third cameras.
4. The vehicle charging system based on license plate recognition of claim 3, wherein the calculating the cost of the vehicle further comprises:
and calculating the cost of the vehicle according to the track of the vehicle on the expressway.
5. The vehicle charging system based on license plate recognition of claim 4, wherein the information processing device is further configured to:
and matching the license plate number identified from the vehicle images collected by the plurality of third cameras with the license plate number of the vehicle entering the charging area and not leaving the charging area, and filtering the unmatched license plate numbers.
6. The vehicle charging system based on license plate recognition of claim 5, wherein the license plate number is recognized from the vehicle images collected by the plurality of third cameras, further comprising:
when the vehicle enters the detection range of the third camera, recording the entering time of the vehicle;
intercepting a plurality of vehicle images from the video stream of the third camera at a preset speed from the entry time;
and identifying the license plate number from the intercepted vehicle image.
7. The vehicle charging system based on license plate recognition of claim 1 or 6, wherein the information processing device is configured to recognize a license plate number from a vehicle image by:
preprocessing the vehicle image, calculating an edge gradient image, removing image noise data, and obtaining the edge gradient image;
performing threshold segmentation on the edge gradient image, distinguishing a candidate license plate region and a background, and removing image noise data;
extracting candidate license plate region images from the images after thresholding segmentation;
filtering the fake license plate area image to obtain a final license plate area image;
judging whether the number of pixels of the final license plate region image is higher than a threshold value, if so, taking the license plate region image as an effective license plate region image;
and reading the license plate number from the effective license plate area image.
8. The vehicle charging system based on license plate recognition of claim 7, wherein the information processing device is further configured to:
accessing an online payment platform and requesting to deduct fees from corresponding accounts;
and if the online payment platform has no corresponding account, informing the vehicle owner to handle the payment and binding the financial account service.
9. The vehicle charging system based on license plate recognition of claim 8, wherein the information processing device comprises a first information processing device for image processing and analysis and a second information processing device for charging fee deduction, the first information processing device is connected with the camera, and the second information processing device is connected with the first information processing device.
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| CN202110625417.7A CN113269116A (en) | 2021-06-04 | 2021-06-04 | Vehicle charging system based on license plate recognition |
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| CN202110625417.7A CN113269116A (en) | 2021-06-04 | 2021-06-04 | Vehicle charging system based on license plate recognition |
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