CN109902689A - A kind of vehicle license plate recognition methods and system - Google Patents
A kind of vehicle license plate recognition methods and system Download PDFInfo
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- CN109902689A CN109902689A CN201910339692.5A CN201910339692A CN109902689A CN 109902689 A CN109902689 A CN 109902689A CN 201910339692 A CN201910339692 A CN 201910339692A CN 109902689 A CN109902689 A CN 109902689A
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Abstract
A kind of vehicle license plate recognition methods and system, by carrying out identification acquisition come vehicle license board information to driving vehicle come vehicle identification data, record carrys out the real-time time that vehicle license board information is identified to driving vehicle, go the identification acquisition of vehicle license board information that vehicle is gone to identify data driving vehicle, record the real-time time for going vehicle license board information to be identified driving vehicle, when according to carrying out vehicle license board information and go vehicle license board information to whether there is identification data, and time interval and the size of given set time that identical license plate occurs, determine license plate recognition result.Portal frame is across above road, forward direction license plate imaging identification component and backward license plate imaging identification component are separately connected portal frame, and the license plate identification data that forward direction license plate imaging identification component and backward license plate imaging identification component will acquire is transferred to industrial personal computer by interchanger.The embodiment of the present invention disposably increases Car license recognition chance originally only once twice, to greatly improve highway Car license recognition success rate.
Description
Technical field
The present embodiments relate to field of license plate recognition, and in particular to one kind is based on two-way double imaging identification component
Vehicle license plate recognition methods and system.
Background technique
China in 1988 has built up first highway-Shanghai and has praised highway.This indicates opening for China's highway
Begin to start construction.Hereafter annual, the highway in China is all in the speed increase with 2000Km.In development in more than 30 years,
Also there is the highway of oneself in western and each autonomous region, China.By the end of the end of the year 2018, in the highway in China is total
Number of passes alreadys exceed 140,000 kilometers, occupies the first in the world.While highway sustainable growth, the car ownership in China
Rapid growth.Cut-off is current, and the car ownership in China has been over 3.1 hundred million, and the situation persistently risen is presented.
Currently, the deployment way of the Vehicle License Plate Recognition System on highway be it is single unidirectional, i.e., in highway portal frame
On come that a set of Car license recognition video camera is installed to every lane towards vehicle, for shooting and identifying vehicle photo and license plate letter
Breath.But due to the limitation that video imaging itself is illuminated by the light, weather etc. is affected, the success rate of single Vehicle License Plate Recognition System
Only once distinguishing opportunity, causes Car license recognition success rate to be constantly in relatively low level, recognition success rate under limiting case
Even less than 60%, the application of extreme influence Car license recognition on a highway.
Summary of the invention
For this purpose, the embodiment of the present invention provides a kind of vehicle license plate recognition methods and system, it is based on two-way double Car license recognition
Camera assembly is increased Car license recognition chance originally only once for twice using license plate there are the characteristic of headstock and the tailstock,
Improve the success rate of Car license recognition.
To achieve the goals above, the embodiment of the present invention provides the following technical solutions: a kind of vehicle license plate recognition methods, institute
It states in recognition methods, to license plate imaging identification component and backward license plate imaging identification component, the forward direction license plate camera shooting before configuration
Recognizer component identifies direction to the car license plate, and the backward license plate imaging identification component recognition removes vehicle direction license plate, by the forward direction
Any one in license plate imaging identification component and backward license plate imaging identification component identify successful direction to the car license plate data or
Go license plate recognition result of the vehicle direction license plate data as vehicle.Specifically, the following steps are included:
Identify that obtaining vehicle identifies data to the vehicle license board information of coming of driving vehicle, record carrys out the driving vehicle
The real-time time T that vehicle license board information is identified1;
Vehicle license board information is gone to carry out identifying that acquisition goes vehicle to identify data driving vehicle, record removes the driving vehicle
The real-time time T that vehicle license board information is identified2;
When to carrying out vehicle license board information and vehicle license board information being gone to there are identification data, if when the time of identical license plate appearance
Interval is less than given set time T, and T2-T1When > 0;Determine to carry out vehicle license board information and vehicle license board information gone to identify success,
Vehicle identification data or vehicle is gone to identify data as license plate recognition result using described.
As the preferred embodiment of vehicle license plate recognition methods, when to carrying out vehicle license board information and vehicle license board information gone to exist to know
When other data, if when the time interval that identical license plate occurs is greater than given set time T or T2-T1< 0 determines vehicle twice
By portal frame, and carry out vehicle license board information and to go vehicle license board information to identify respectively successfully primary.
As the preferred embodiment of vehicle license plate recognition methods, according to the real-time time T for carrying out vehicle license board information and being identified1
With to the real-time time T for going vehicle license board information to be identified2License plate recognition result is judged, in T2-T1In the case where < T;When to next
Vehicle license board information identify successfully, to vehicle license board information recognition failures are removed when, since vehicle identification data as license plate recognition result;When
To carry out vehicle license board information recognition failures, to going the vehicle license board information to identify successfully when, to go vehicle to identify data as Car license recognition knot
Fruit.
The embodiment of the present invention also provides a kind of vehicle license plate identifying system, including portal frame, and the portal frame is across
Road side, to license plate imaging identification component, backward license plate imaging identification component, interchanger and industrial personal computer before further including;Before described
Be separately connected the portal frame to license plate imaging identification component and backward license plate imaging identification component, the interchanger and it is described before
It establishes a connection to license plate imaging identification component and backward license plate imaging identification component, interchanger and the industrial personal computer are established and connected
Relationship is connect, the license plate identification data that the forward direction license plate imaging identification component and backward license plate imaging identification component will acquire passes through
Interchanger is transferred to the industrial personal computer.
As the preferred embodiment of vehicle license plate identifying system, the forward direction license plate imaging identification component is used for driving vehicle
Come vehicle license board information carry out identification obtain come vehicle identification data, forward direction license plate imaging identification component record is to the driving vehicle
Carry out the real-time time T that vehicle license board information is identified1。
As the preferred embodiment of vehicle license plate identifying system, the backward license plate imaging identification component is used for driving vehicle
Go vehicle license board information carry out identification obtain go vehicle identify data, backward license plate imaging identification component record is to the driving vehicle
The real-time time T for going vehicle license board information to be identified2。
As the preferred embodiment of vehicle license plate identifying system, the industrial personal computer includes license plate determination module, and the license plate is sentenced
In cover half block, when to carrying out vehicle license board information and vehicle license board information being gone to there are identification data, if when identical license plate occurs
Between interval be less than given set time T, and T2-T1When > 0, determines to carry out vehicle license board information and vehicle license board information is gone to be identified as
Function vehicle identification data or goes vehicle to identify data as license plate recognition result using described.
As the preferred embodiment of vehicle license plate identifying system, in the license plate determination module, when to come vehicle license board information and
When vehicle license board information being gone to there are identification data, if when the time interval that identical license plate occurs is greater than given set time T, or
T2-T1< 0 indicates to carry out vehicle license board information and to go vehicle license board information identify respectively successfully primary, according to carrying out the progress of vehicle license board information
The real-time time T of identification1With to the real-time time T for going vehicle license board information to be identified2License plate recognition result is judged, in T2-T1It is small
In the case where T;When to come vehicle license board information identify successfully, to vehicle license board information recognition failures are removed when, since vehicle identify data
As license plate recognition result;When to carry out vehicle license board information recognition failures, to going vehicle license board information to identify successfully when, to go vehicle to identify
Data are as license plate recognition result.
As the preferred embodiment of vehicle license plate identifying system, the industrial personal computer and the forward direction license plate imaging identification component and
Backward license plate imaging identification component is established a connection by cable network or wireless transport module, and the cable network is using string
One of mouth, network interface or optical fiber, the wireless transport module use one of bluetooth, 3G, 4G or WiFi.
It further include control data corporation as the preferred embodiment of vehicle license plate identifying system, the industrial personal computer is by the vehicle
Board recognition result is sent to the control data corporation.
The embodiment of the present invention has the advantages that by carrying out identification acquisition come vehicle license board information to driving vehicle come vehicle
Identify data, record carrys out the real-time time that vehicle license board information is identified to driving vehicle, goes vehicle license plate to believe driving vehicle
Breath carries out identification acquisition and vehicle is gone to identify data, records the real-time time for going vehicle license board information to be identified driving vehicle, according to
Carry out vehicle license board information and go vehicle license board information and whether there is time interval that when identification data and identical license plate occurs with to
The size of fixed set time determines license plate recognition result.The embodiment of the present invention is based on two-way double Car license recognition camera shooting, utilizes
There are the characteristics of headstock and the tailstock for license plate, Car license recognition chance originally only once are disposably increased twice, to mention significantly
The high success rate of highway Car license recognition.
Detailed description of the invention
It, below will be to embodiment party in order to illustrate more clearly of embodiments of the present invention or technical solution in the prior art
Formula or attached drawing needed to be used in the description of the prior art are briefly described.It should be evident that the accompanying drawings in the following description is only
It is merely exemplary, it for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer, which is extended, obtains other implementation attached drawings.
Fig. 1 is a kind of vehicle license plate recognition methods schematic diagram provided in the embodiment of the present invention;
Fig. 2 is a kind of vehicle license plate identifying system schematic diagram provided in the embodiment of the present invention;
Fig. 3 is a kind of vehicle license plate identifying system schematic layout pattern provided in the embodiment of the present invention.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily, it is clear that described embodiment is the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
In the specific technical solution for understanding the embodiment of the present invention, the meaning of following technical characteristic are as follows:
Carry out vehicle license board information, positioned at the license board information of front of the car, when vehicle is taken the photograph close to forward direction license plate on a highway
When as recognizer component to come vehicle license board information identification;
Vehicle license board information is gone, positioned at the license board information of rear vehicle end, when vehicle is taken the photograph by preceding to license plate on a highway
As recognizer component and far from when pass through after to license plate imaging identification component to go vehicle license board information identify;
Carry out vehicle identification data, identifies the data obtained to vehicle license board information is carried out to license plate imaging identification component by preceding;
Go vehicle identify data, by it is rear to license plate imaging identification component to go vehicle license board information identification obtain data.
Referring to Fig. 1, the embodiment of the present invention provides a kind of vehicle license plate recognition methods, comprising the following steps:
S1a: identify that obtaining vehicle identifies data to the vehicle license board information of coming of driving vehicle, record is to the Travel vehicle
Carry out the real-time time T that vehicle license board information is identified1;
S2a: it goes vehicle license board information to carry out identifying that acquisition goes vehicle to identify data driving vehicle, records to the Travel vehicle
The real-time time T for going vehicle license board information to be identified2;
S3a: when to carrying out vehicle license board information and vehicle license board information being gone to there are identification data, if occur when identical license plate
Time interval is less than given set time T, and T2-T1When > 0, determines to carry out vehicle license board information and vehicle license board information is gone to identify
Success vehicle identification data or goes vehicle to identify data as license plate recognition result using described.
In one embodiment of vehicle license plate recognition methods, S3b: when to vehicle license board information and vehicle license board information to be gone to deposit
When identifying data, if when the time interval that identical license plate occurs is greater than given set time T or T2-T1When < 0, vehicle is determined
Portal frame is passed twice through, and carrys out vehicle license board information and to go vehicle license board information to identify respectively successfully primary.S3c: according to next
The real-time time T that vehicle license board information is identified1With to the real-time time T for going vehicle license board information to be identified2Judge Car license recognition
As a result, in T2-T1In the case where < T;When to come vehicle license board information identify successfully, to vehicle license board information recognition failures are removed when, since
Vehicle identifies data as license plate recognition result;When to carry out vehicle license board information recognition failures, to going vehicle license board information to identify successfully when,
To go vehicle to identify data as license plate recognition result.
Referring to figs. 2 and 3, the embodiment of the present invention also provides a kind of vehicle license plate identifying system, including portal frame 1, described
Portal frame 1 is across above road, to license plate imaging identification component 2, backward license plate imaging identification component 3, exchange before further including
Machine 4 and industrial personal computer 5;The forward direction license plate imaging identification component 2 and backward license plate imaging identification component 3 are separately connected described gantry
Frame 1, the interchanger 4 establish connection pass with the forward direction license plate imaging identification component 2 and backward license plate imaging identification component 3
System, interchanger 4 establish a connection with the industrial personal computer 5, and the forward direction license plate imaging identification component 2 and the camera shooting of backward license plate are known
The license plate identification data that other component 3 will acquire is transferred to the industrial personal computer 5 by interchanger 4.
In one embodiment of vehicle license plate identifying system, the forward direction license plate imaging identification component 2 is used for Travel vehicle
Come vehicle license board information carry out identification obtain come vehicle identification data, forward direction license plate imaging identification component 2 record to the traveling
Vehicle carrys out the real-time time T that vehicle license board information is identified1.The backward license plate imaging identification component 3 is used for driving vehicle
Go vehicle license board information to carry out identification and obtain that vehicle is gone to identify data, backward license plate imaging identification component 3 record is to the Travel vehicle
The real-time time T for going vehicle license board information to be identified2.The industrial personal computer 5 includes license plate determination module 6, and the license plate determines
In module 6, when to carrying out vehicle license board information and vehicle license board information being gone to there are identification data, if when the time of identical license plate appearance
Interval is less than given set time T, and T2-T1When > 0, determines to carry out vehicle license board information and vehicle license board information is gone to identify success,
Vehicle identification data or vehicle is gone to identify data as license plate recognition result using described.
For example, when vehicle travels the forward direction license plate imaging identification by being arranged on a portal frame 1 on a highway
Component 2 and backward license plate imaging identification component 3, forward direction license plate imaging identification component 2 carrys out vehicle license plate letter to driving vehicle at this time
Breath carries out identification acquisition one and carrys out vehicle identification data A, and vehicle is after portal frame 1, backward 3 pairs of license plate imaging identification component travelings
Vehicle go vehicle license board information carry out identification obtain one go vehicle identify data B, at this time if obtain come vehicle identification data A and
Go vehicle identification data B identical, since forward direction license plate imaging identification component 2 and backward license plate imaging identification component 3 are identifying mistake
Under the premise of carry out vehicle identification data A and go the identical probability of vehicle identification data B almost nil, and vehicle passes through positioned at a dragon
The time difference of forward direction license plate imaging identification component 2 and backward license plate imaging identification component 3 on door frame 1 is can be according to speed model
Enclose and counted in advance, thus when carry out vehicle identification data A and go vehicle identification data B identical and the time interval that occurs less than to
Fixed set time T, and T2-T1When > 0, it may be considered that forward direction license plate imaging identification component 2 and backward license plate imaging identification group
Part 3 to Car license recognition success, at this time can vehicle in future identification data A or go vehicle identification data B as license plate recognition result.
In one embodiment of vehicle license plate identifying system, in the license plate determination module 6, when to come vehicle license board information and
When vehicle license board information being gone to there are identification data, if when the time interval that identical license plate occurs is greater than given set time T, or
T2-T1When < 0, determine that vehicle passes twice through the portal frame, and carry out vehicle license board information and vehicle license board information is gone to identify success respectively
Once, according to the real-time time T for carrying out vehicle license board information and being identified1With to the real-time time for going vehicle license board information to be identified
T2License plate recognition result is judged, in T2-T1In the case where < T;When identifying successfully, to going vehicle license board information to carrying out vehicle license board information
When recognition failures, since vehicle identification data as license plate recognition result;When to carry out vehicle license board information recognition failures, to removing vehicle license plate
When information is identified successfully, to go vehicle to identify data as license plate recognition result.
Specifically, knowing when vehicle travels on a highway by the forward direction license plate camera shooting being arranged on a portal frame 1
Other component 2 and backward license plate imaging identification component 3, forward direction license plate imaging identification component 2 carrys out vehicle license plate to driving vehicle at this time
Information carries out identification acquisition one and carrys out vehicle identification data A, and vehicle is after portal frame 1, backward 3 pairs of rows of license plate imaging identification component
That sails vehicle goes vehicle license board information identify that obtaining one goes vehicle to identify data B, at this time if what is obtained carrys out vehicle identification data A
It is different with vehicle identification data B is removed, then it can not assert that carrying out vehicle identifies which is correctly to identify to data A with vehicle identification data B is removed
As a result.When vehicle is in subsequent driving process, 2 He of forward direction license plate imaging identification component on a portal frame 1 is again passed by
When backward license plate imaging identification component 3, then it will appear one again and carry out vehicle identification data C and one is gone vehicle to identify data D, at this time such as
Fruit, which carrys out vehicle identification data C and Lai Che identification data A, identical then can be determined that carrying out vehicle identification data is accurately identical license plate at this time
Time of occurrence interval be greater than given set time T (there is a certain distance between two portal frames 1, vehicle this section away from
Need to expend the regular hour from driving process), thus can vehicle in future identification data C and Lai Che identification data A any result
As license plate recognition result.Similarly, it can be determined that vehicle identifies if going vehicle identification data D identical with vehicle identification data B is removed
Data are accurate, therefore can will remove vehicle identification data D and go any result of vehicle identification data B as license plate recognition result.
In one embodiment of vehicle license plate identifying system, the industrial personal computer 5 and the forward direction license plate imaging identification component 2
It is established a connection with backward license plate imaging identification component 3 by wireless transport module 7, the wireless transport module 7 is using blue
One of tooth, 3G, 4G or WiFi, the industrial personal computer 5 are known with the forward direction license plate imaging identification component 2 and the camera shooting of backward license plate
Other component 3 can also be established a connection by cable network 9, and cable network 9 is using one of serial ports, network interface or optical fiber.
It additionally include control data corporation 8, the license plate recognition result is sent to the control data corporation 8 by the industrial personal computer 5.
Specifically, using the two-way double Car license recognition camera assembly in front and back and license plate of deployment, there are the characteristics of headstock and the tailstock, will be former
Originally Car license recognition chance only once increases twice, to improve the method for identifying success rate.Utilize industrial personal computer 5 or other modes
(judgement is screened in license plate imaging identification component networking itself, control data corporation 8 screens the modes such as judgement) completes Car license recognition number
According to examination judgement method, complete license plate by interchanger 4 or other networking modes (in the way of bluetooth, 3G/4G, WiFi etc.) and take the photograph
The method shared as identifying system data interchange.
The present invention is recorded by carrying out identification acquisition come vehicle license board information to driving vehicle come vehicle identification data to traveling
Vehicle carrys out the real-time time that vehicle license board information is identified, goes vehicle license board information to carry out identifying that acquisition goes vehicle to know driving vehicle
Other data record the real-time time for going vehicle license board information to be identified driving vehicle, according to vehicle license board information and to remove vehicle vehicle
Board information whether there is the time interval and the size of given set time that when identifying data and identical license plate occurs,
Determine license plate recognition result.The embodiment of the present invention is based on two-way double Car license recognition camera shooting, and using license plate, there are headstocks and the tailstock
Characteristic, Car license recognition chance originally only once is disposably increased as twice, the knowledge of highway license plate is substantially increased
Other success rate.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (10)
1. a kind of vehicle license plate recognition methods, which is characterized in that in the recognition methods, to license plate imaging identification component before configuration
With backward license plate imaging identification component, the forward direction license plate imaging identification component recognition direction to the car license plate, the backward license plate
Imaging identification component recognition removes vehicle direction license plate, by the forward direction license plate imaging identification component and backward license plate imaging identification component
In any one identify successful direction to the car license plate data or go license plate recognition result of the vehicle direction license plate data as vehicle.
2. a kind of vehicle license plate recognition methods according to claim 1, which comprises the following steps:
Identify that obtaining vehicle identifies data to the vehicle license board information of coming of driving vehicle, record carrys out vehicle vehicle to the driving vehicle
The real-time time T that board information is identified1;
Vehicle license board information is gone to carry out identifying that acquisition goes vehicle to identify data driving vehicle, record removes vehicle vehicle to the driving vehicle
The real-time time T that board information is identified2;
When to carrying out vehicle license board information and vehicle license board information being gone to there are identification data, if when the time interval of identical license plate appearance
Less than given set time T, and T2-T1When > 0, determines to carry out vehicle license board information and vehicle license board information is gone to identify success, with institute
It states and carrys out vehicle identification data or go vehicle identification data as license plate recognition result.
3. a kind of vehicle license plate recognition methods according to claim 2, which is characterized in that when to vehicle license board information and to go
When there are identification data in vehicle license board information, if when the time interval that identical license plate occurs is greater than given set time T, or
T2-T1< 0 determines that vehicle passes twice through portal frame, and carrys out vehicle license board information and vehicle license board information is gone to identify successfully one respectively
It is secondary.
4. a kind of vehicle license plate recognition methods according to claim 3, which is characterized in that according to come vehicle license board information into
The real-time time T of row identification1With to the real-time time T for going vehicle license board information to be identified2Judge license plate recognition result;In T2-T1
In the case where less than T, when to come vehicle license board information identify successfully, to vehicle license board information recognition failures are removed when, since vehicle identify number
According to as license plate recognition result;When to carry out vehicle license board information recognition failures, to going vehicle license board information to identify successfully when, to go vehicle to know
Other data are as license plate recognition result.
5. a kind of vehicle license plate identifying system, including portal frame, the portal frame is across above road, which is characterized in that also
Including preceding to license plate imaging identification component, backward license plate imaging identification component, interchanger and industrial personal computer;The forward direction license plate camera shooting
Recognizer component and backward license plate imaging identification component are separately connected the portal frame, and the interchanger and the forward direction license plate image
Recognizer component and backward license plate imaging identification component establish a connection, and interchanger establishes a connection with the industrial personal computer, institute
The license plate identification data that will acquire before stating to license plate imaging identification component and backward license plate imaging identification component is passed by interchanger
It is defeated to arrive the industrial personal computer.
6. a kind of vehicle license plate identifying system according to claim 5, which is characterized in that the forward direction license plate imaging identification
Component is used to carry out identifying that acquisition carrys out vehicle and identifies data, forward direction license plate imaging identification component to the vehicle license board information of coming of driving vehicle
Record carrys out the real-time time T that vehicle license board information is identified to the driving vehicle1;
The backward license plate imaging identification component is used to go vehicle license board information to carry out identifying that acquisition goes vehicle to identify driving vehicle
Data, the real-time time T that backward license plate imaging identification component record goes vehicle license board information to be identified the driving vehicle2。
7. a kind of vehicle license plate identifying system according to claim 5, which is characterized in that the industrial personal computer includes that license plate is sentenced
Cover half block, in the license plate determination module, when to carrying out vehicle license board information and vehicle license board information being gone to there are identification data, if working as
The time interval that identical license plate occurs is less than given set time T, determines to carry out vehicle license board information and vehicle license board information is gone to know
Not Cheng Gong, vehicle identification data or vehicle is gone to identify data as license plate recognition result using described.
8. a kind of vehicle license plate identifying system according to claim 7, which is characterized in that in the license plate determination module,
When to carrying out vehicle license board information and vehicle license board information being gone to there are identification data, if when the time interval that identical license plate occurs is greater than
Given set time T or T2-T1< 0 is indicated to carry out vehicle license board information and to go vehicle license board information to identify respectively successfully primary;According to
To the real-time time T for carrying out vehicle license board information and being identified1With to the real-time time T for going vehicle license board information to be identified2Judge license plate
Recognition result, in T2-T1In the case where T;When identifying successfully, to removing vehicle license board information recognition failures to carrying out vehicle license board information
When, since vehicle identification data as license plate recognition result;When to come vehicle license board information recognition failures, to go vehicle license board information identify
When success, to go vehicle to identify data as license plate recognition result.
9. a kind of vehicle license plate identifying system according to claim 5, which is characterized in that the industrial personal computer and the forward direction
License plate imaging identification component and backward license plate imaging identification component are established a connection by cable network or wireless transport module,
The cable network uses bluetooth, 3G, 4G or WiFi using one of serial ports, network interface or optical fiber, the wireless transport module
One of.
10. a kind of vehicle license plate identifying system according to claim 5, which is characterized in that it further include control data corporation,
The license plate recognition result is sent to the control data corporation by the industrial personal computer.
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