CN111862622B - Device and method for improving identification accuracy of license plate at lane entrance - Google Patents
Device and method for improving identification accuracy of license plate at lane entrance Download PDFInfo
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- CN111862622B CN111862622B CN202010731263.5A CN202010731263A CN111862622B CN 111862622 B CN111862622 B CN 111862622B CN 202010731263 A CN202010731263 A CN 202010731263A CN 111862622 B CN111862622 B CN 111862622B
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
- G08G1/0175—Detecting movement of traffic to be counted or controlled identifying vehicles by photographing vehicles, e.g. when violating traffic rules
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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
- G06V20/52—Surveillance or monitoring of activities, e.g. for recognising suspicious objects
- G06V20/54—Surveillance or monitoring of activities, e.g. for recognising suspicious objects of traffic, e.g. cars on the road, trains or boats
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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 discloses a method for improving the accuracy of recognizing license plates at lane openings, which comprises the following steps: s01: when a vehicle enters a vehicle crossing, the entrance camera shoots a license plate image B and transmits the license plate image B to an entrance recognition center; the entrance recognition center calculates the license plate image B to obtain license plate information B; wherein the entrance recognition center recognizes less than or equal to 2 license plate information B within M seconds; s02: the vehicle is driven out of the vehicle crossing, and the license plate image A is shot by the exit camera and is transmitted to the exit recognition center; the exit recognition center calculates the license plate image A to obtain license plate information A; the exit identification center identifies at least 3 license plate information A within 2M seconds; s03: and the license plate information B and the license plate information A are transmitted to a control center, and the control center adopts a self-adaptive intelligent checking and matching algorithm to obtain accurate license plate information C. The invention can greatly improve the accuracy of license plate recognition and can be widely applied to various systems for vehicle management.
Description
Technical Field
The invention relates to the field of license plate recognition, in particular to a device and a method for improving the accuracy of license plate recognition at a lane opening.
Background
With the popularization of private cars and the wide application of intelligent management systems, license plate recognition has become the most important and basic part of a vehicle management system, and further application and operation of the vehicle management system need to be established on the basis of license plate recognition. In the prior art, the license plate recognition technology adopts a method for directly recognizing license plate images, and under the conditions of large traffic flow and small inter-vehicle distance, the license plate images are difficult to shoot, so that vehicle missing or repeated shooting is easily caused, and further, the recognition system is caused to repeatedly recognize or miss vehicles.
Particularly, when the vehicle is identified at a high-speed toll station, the license plate identification system is closely associated with the receiving and dispatching card, if repeated identification or vehicle leakage occurs, the receiving and dispatching card is caused to have problems, and the vehicle passing efficiency of the toll station is seriously influenced.
In the prior art, a license plate recognition system is influenced by the external environment of a vehicle crossing, such as different external illumination in night, day, rainy day, sunny day and the like, and the license plate image and the recognition result are also influenced; too fast a vehicle speed may result in missed vehicles, and too long boxcars may result in repeated identification. Therefore, in the prior art, the license plate recognition system cannot achieve high enough accuracy due to a plurality of factors such as the speed of the vehicle, the external environment, the position of the license plate in the vehicle, the license plate recognition algorithm and the like.
Disclosure of Invention
The invention aims to provide a device and a method for improving the accuracy of vehicle license plate recognition at a lane entrance.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for improving the accuracy rate of recognizing license plates at lane openings comprises the following steps:
s01: when a vehicle enters a vehicle crossing, the entrance camera shoots a license plate image B and transmits the license plate image B to an entrance recognition center; the entrance recognition center calculates the license plate image B to obtain license plate information B; wherein the entrance recognition center recognizes less than or equal to 2 license plate information B within M seconds; m is greater than 0;
s02: the vehicle is driven out of the vehicle crossing, and the license plate image A is shot by the exit camera and is transmitted to the exit recognition center; the exit recognition center calculates the license plate image A to obtain license plate information A; the exit identification center identifies at least 3 license plate information A within 2M seconds;
s03: and the license plate information B and the license plate information A are transmitted to a control center, and the control center adopts a self-adaptive intelligent checking and matching algorithm to obtain accurate license plate information C.
Further, the license plate information B comprises license plate information B1 and license plate information B2, and the license plate information A comprises license plate information A1, license plate information A2 and license plate information A3;
if the license plate information B1 is consistent with the license plate information A1, and the license plate information B2 is consistent with the license plate information A2, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A1, and the license plate information B2 is consistent with the license plate information A3, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2, and the license plate information B2 is consistent with the license plate information A3, the license plate information C is consistent with the license plate information B1;
if only the license plate information B2 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B2;
if only the license plate information B1 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1.
Further, the license plate information B comprises license plate information B1 and license plate information B2, and the license plate information A comprises license plate information A1 and license plate information A2;
if the license plate information B1 is consistent with the license plate information A1, and the license plate information B2 is consistent with the license plate information A2, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2 and the license plate information B1 is empty, the license plate information C is consistent with the license plate information B2; if the license plate information B1 is consistent with the license plate information A2 and the license plate information B1 is not empty, otherwise, the license plate information C is consistent with the license plate information B1;
and if the license plate information B1, the license plate information B2, the license plate information A1 and the license plate information A2 are inconsistent, the license plate information C is consistent with the license plate information A1.
Further, the license plate information B comprises license plate information B1 and license plate information B2, and the license plate information A comprises license plate information A1;
if the license plate information B1 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2, the license plate information C is consistent with the license plate information B1;
if the license plate information B2 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B2;
and if the license plate information B1 and the license plate information B2 are not consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1.
Further, the license plate information B comprises license plate information B1 and license plate information B2, and the license plate information A is empty; the license plate information C coincides with the license plate information B1.
Further, the license plate information B comprises license plate information B1, and the license plate information A comprises license plate information A1, license plate information A2 and license plate information A3;
if the license plate information B1 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2 and the license plate information A1 is empty, the license plate information C is consistent with the license plate information B1; if the license plate information B1 is consistent with the license plate information A2 and the license plate information A1 is not empty, the license plate information C is consistent with the license plate information A1;
if the license plate information B1 is consistent with the license plate information A3, comparing time differences among adjacent license plate information in the license plate information A1, the license plate information A2 and the license plate information A3, and if the time differences are smaller than a time threshold, determining that the license plate information C is consistent with the license plate information A3; if the license plate information B1 is consistent with the license plate information A3, comparing time differences between adjacent license plate information in the license plate information A1, the license plate information A2 and the license plate information A3, and if at least one time difference is larger than a time threshold, comparing the time difference A between the license plate information A1 and the license plate information A221If the time difference A21If the time threshold value is smaller than the time threshold value, the license plate information C is consistent with the license plate information A2; otherwise, the license plate information C is consistent with the license plate information A1;
and if the license plate information B1 is not consistent with the license plate information A1, the license plate information A2 and the license plate information A3, comparing time differences among adjacent license plate information in the license plate information A1, the license plate information A2 and the license plate information A3, and if the time differences are smaller than a time threshold value, determining that the license plate information C is consistent with the license plate information A1.
Further, the license plate information B comprises license plate information B1, and the license plate information A comprises license plate information A1 and license plate information A2;
if the license plate information B1 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2, the license plate information C is consistent with the license plate information B1;
and if the license plate information B1 is not consistent with the license plate information A1 and the license plate information A2, the license plate information C is consistent with the license plate information A1.
Further, the license plate information B comprises license plate information B1, and the license plate information A comprises license plate information A1;
if the license plate information B1 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is inconsistent with the license plate information A1 and the license plate information B1 is empty, the license plate information C is consistent with the license plate information A1; if the license plate information B1 is inconsistent with the license plate information A1 and the license plate information B1 is not empty, the license plate information C is consistent with the license plate information B1;
further, the license plate information B includes license plate information B1, and the license plate information a is empty; the license plate information C coincides with the license plate information B1.
A device for improving the accuracy of license plate recognition at a lane entrance comprises a control center, an entrance camera and an entrance recognition center which are positioned at the entrance of a lane, and an exit camera and an exit recognition center which are positioned at the exit of the lane, wherein the entrance camera shoots a license plate image B and transmits the license plate image B to the entrance recognition center, and the entrance recognition center calculates the license plate image B to obtain license plate information B; the exit recognition center calculates the license plate image A to obtain license plate information A; the control center adopts a self-adaptive intelligent checking matching algorithm to obtain accurate license plate information C according to the license plate information B and the license plate information A; wherein the entrance recognition center recognizes less than or equal to 2 license plate information B within M seconds; the exit recognition center recognizes at least 3 license plate information A within 2M seconds; m is greater than 0.
The invention has the following beneficial effects: the invention adopts an inlet camera and an inlet recognition center to obtain license plate information B, adopts an outlet camera and an outlet recognition center to obtain license plate information A, and obtains accurate license plate information C through a self-adaptive intelligent checking and matching algorithm; the invention can greatly improve the accuracy of license plate recognition and can be widely applied to various systems for vehicle management.
Drawings
FIG. 1 is a schematic diagram of a device for improving the accuracy of vehicle license plate recognition at a lane entrance in embodiment 1;
FIG. 2 is a schematic diagram of a device for improving the accuracy of vehicle license plate recognition at a lane entrance in embodiment 2;
FIG. 3 is a schematic view of a device for improving the accuracy of license plate recognition at a lane entrance in embodiment 3;
in the figure: the lane identification system comprises a lane left edge 101, a lane right edge 102, a vehicle 103, an exit identification module 104, an entrance identification module 105, an exit light supplement lamp 106 and an entrance light supplement lamp 107.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1-3, the device for improving the accuracy of recognizing the license plate at the lane entrance provided by the invention comprises a control center, an entrance camera positioned at the entrance of the lane, an entrance recognition center, an exit camera positioned at the exit of the lane, and an exit recognition center. Preferably, the entrance camera and the entrance recognition center may be integrated in the entrance recognition module 105, and the exit camera and the exit recognition center may be integrated in the exit recognition module 104.
The entrance recognition module 105 and the exit recognition module 104 may be disposed on the same side or on two sides of the lane, and may be specifically disposed according to actual requirements. As shown in fig. 1, a schematic diagram of an apparatus in which an entrance recognition module 105 and an exit recognition module 104 are disposed on the same side of a lane in embodiment 1 is shown; as shown in fig. 2, a schematic diagram of an apparatus in which an entrance recognition module 105 is disposed on the right side of a lane and an exit recognition module 104 is disposed on the left side of the lane in embodiment 2; as shown in fig. 3, the device of embodiment 3 is configured such that the recognition module 105 is disposed on the left side of the lane and the exit recognition module 104 is disposed on the right side of the lane.
The entrance camera shoots a license plate image B and transmits the license plate image B to the entrance recognition center, and the entrance recognition center calculates the license plate image B to obtain license plate information B; the exit camera shoots a license plate image A and transmits the license plate image A to an exit recognition center, and the exit recognition center calculates the license plate image A to obtain license plate information A; and the control center acquires accurate license plate information C by adopting a self-adaptive intelligent checking and matching algorithm according to the license plate information B and the license plate information A.
The entrance camera and the exit camera only need to shoot license plate images, the license plate images can be front license plate images or rear license plate images, and the positions of the license plate images shot by the entrance camera and the exit camera can be specifically set according to actual requirements. In practical application, if the device is used in a vehicle management system such as a toll station and the like which needs to determine the next operation according to license plate information, the license plate image B and the license plate image A are preferably front license plate images, because the entrance camera is over against the entering direction of the vehicle, shooting can be carried out between lanes where the vehicle enters, and the whole recognition time can be saved; the final recognition result is directly determined by the recognition result of the license plate image shot by the exit camera, and further the next operation of the vehicle recognition system is related, so that the license plate information A needs to be obtained before the vehicle exits the lane, and the license plate information A needs to be shot by the exit camera and is also the front license plate information.
In order to improve the definition of a license plate image, an inlet light supplement lamp 107 and an outlet light supplement lamp 106 can be respectively arranged below an inlet camera and an outlet camera, because the external environments are different during shooting, the light supplement lamps can be arranged to improve the definition of the image, the parameters of the light supplement lamps are related to the positions of the cameras and other factors, and the outlet light supplement lamps and the inlet light supplement lamps can be automatically adjusted according to the change of the external environments where the corresponding cameras are located; thereby improving the definition of the shot image.
The processing process of the license plate image B by the entrance recognition module and the processing process of the license plate image A by the exit recognition module are independent processes, and the algorithms adopted by the entrance recognition module and the exit recognition module are different from each other in the preprocessing operation of the images.
The invention provides a method for improving the accuracy of recognizing a license plate at a lane entrance, which comprises the following steps:
s01: when a vehicle enters a vehicle crossing, the entrance camera shoots a license plate image B and transmits the license plate image B to an entrance recognition center; the entrance recognition center calculates the license plate image B to obtain license plate information B; wherein, the entrance recognition center recognizes less than or equal to 2 license plate information B within M seconds; m is greater than 0. For example, when the entrance recognition center recognizes the license plate information B1 and the license plate information B2, the entrance recognition center transmits the information to the control center, and if the entrance recognition center recognizes only the license plate information B1, the entrance recognition center continues to wait for 5 seconds, and if the entrance recognition center still recognizes only the license plate information B1 after 5 seconds, the license plate information B1 is transmitted to the control center.
S02: the vehicle is driven out of the vehicle crossing, and the license plate image A is shot by the exit camera and is transmitted to the exit recognition center; the exit recognition center calculates the license plate image A to obtain license plate information A; wherein, the exit identification center identifies less than or equal to 3 license plate information A within 2M seconds. For example, when the exit recognition center recognizes the license information a1, the license information a2, and the license information A3, the exit recognition center transmits the license information a1, the license information a2, and the license information A3 to the control center, and if the entrance recognition center recognizes only the license information a1 and/or the license information a2, the entrance recognition center continues to wait for 10 seconds, and if the entrance recognition center still recognizes only the license information a1 and/or the license information a2, the license information a1 and/or the license information a2 is transmitted to the control center.
The values are explained in the invention, license plate images shot by the inlet camera and the outlet camera comprise time stamps of shooting moments, the time stamps also exist along with license plate information B and license plate information A, and when the control center comprehensively judges the license plate information B and the license plate information A, the source of the license plate information and a corresponding calculation algorithm can be determined according to the time stamps in the license plate information B and the license plate information A.
S03: and the license plate information B and the license plate information A are transmitted to a control center, and the control center adopts a self-adaptive intelligent checking and matching algorithm to obtain accurate license plate information C.
Specifically, the process of the control center acquiring accurate license plate information C includes the following situations:
(1) the license plate information B comprises license plate information B1 and license plate information B2, and the license plate information A comprises license plate information A1, license plate information A2 and license plate information A3;
if the license plate information B1 is consistent with the license plate information A1, and the license plate information B2 is consistent with the license plate information A2, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A1, and the license plate information B2 is consistent with the license plate information A3, the license plate information A2 is a repeated recognition result, and the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2, and the license plate information B2 is consistent with the license plate information A3, the license plate information A1 is a repeated recognition result, and the license plate information C is consistent with the license plate information B1;
if only the license plate information B2 is consistent with the license plate information A1, the license plate information B1 is a repeated recognition result, and the license plate information C is consistent with the license plate information B2;
if only the license plate information B1 is consistent with the license plate information A1, it is indicated that a missing vehicle appears behind the license plate information A1, the license plate information C of the current vehicle is consistent with the license plate information B1, and the license plate information C of the next vehicle is consistent with the license plate information B2.
(2) The license plate information B comprises license plate information B1 and license plate information B2, and the license plate information A comprises license plate information A1 and license plate information A2;
if the license plate information B1 is consistent with the license plate information A1, and the license plate information B2 is consistent with the license plate information A2, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2, the license plate information A1 is a repeated recognition result, and the license plate information C is consistent with the license plate information B1;
if the license plate information B2 is consistent with the license plate information A1, the situation that a vehicle is missed before the license plate information A1 or the license plate information B1 is a repeated recognition result is shown, and at the moment, if the license plate information B1 is empty (no license plate), the license plate information C is consistent with the license plate information B2; if the license plate information B1 is not empty, otherwise, the license plate information C is consistent with the license plate information B1;
if the license information B1 and the license information B2 are inconsistent with the license information A1 and the license information A2, the license information B1 and the license information B2 are repeated, and the license information C is consistent with the license information A1.
(3) The license plate information B comprises license plate information B1 and license plate information B2, and the license plate information A comprises license plate information A1;
if the license plate information B1 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1;
if the license plate information B2 is consistent with the license plate information A1, the license plate information B1 is a repeated recognition result, and the license plate information C is consistent with the license plate information B2;
if the license plate information B1 and the license plate information B2 are inconsistent with the license plate information A1, the situation that the vehicle is missed before the license plate information A1 is indicated, and the license plate information C is consistent with the license plate information B1.
(4) The license plate information B comprises license plate information B1 and license plate information B2, and the license plate information A is empty; the vehicle missing of the exit recognition center is serious, and the license plate information C is consistent with the license plate information B1.
(5) The license plate information B comprises license plate information B1, and the license plate information A comprises license plate information A1, license plate information A2 and license plate information A3;
if the license plate information B1 is consistent with the license plate information A1, serious vehicle leakage behind the license plate information B1 is indicated, and the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2, the situation that the vehicle is missed before the license plate information B1 is indicated, or the repeated recognition result of the license plate information A1 is indicated; at this time, if the license plate information a1 is empty, the license plate information C is consistent with the license plate information B1; if the license plate information A1 is not empty, the license plate information C is consistent with the license plate information A1;
if the license plate information B1 is consistent with the license plate information A3, the situation that the vehicle is seriously missed in the entrance recognition center is shown; comparing time differences among adjacent license plate information in the license plate information A1, the license plate information A2 and the license plate information A3, wherein if the time differences are smaller than a time threshold, the license plate information C is consistent with the license plate information A3; if at least one time difference is larger than the time threshold value, comparing the time difference A between the license plate information A1 and the license plate information A221If the time difference A21If the time threshold value is smaller than the time threshold value, the license plate information C is consistent with the license plate information A2; otherwise, the license plate information C is consistent with the license plate information A1;
and if the license plate information B1 is inconsistent with the license plate information A1, the license plate information A2 and the license plate information A3, comparing time differences among adjacent license plate information in the license plate information A1, the license plate information A2 and the license plate information A3, merging the license plate information A if the time differences are smaller than a time threshold, and enabling the license plate information C to be consistent with the license plate information A. For example, if the time difference between the license plate information a2 and the license plate information a1 is much smaller than the time difference between the license plate information A3 and the license plate information a2, the license plate information C is consistent with the license plate information a 1.
(6) The license plate information B comprises license plate information B1, and the license plate information A comprises license plate information A1 and license plate information A2;
if the license plate information B1 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2, the license plate information A1 is a repeated recognition result, and the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is inconsistent with the license plate information A1 and the license plate information A2, the result of repeated recognition of the license plate information B1 is shown, and the license plate information C is consistent with the license plate information A1.
(7) The license plate information B comprises license plate information B1, and the license plate information A comprises license plate information A1;
if the license plate information B1 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is inconsistent with the license plate information A1, the license plate information B1 is repeated, or the vehicle is missed among the license plate information A1, at the moment, if the license plate information B1 is empty, the license plate information C is consistent with the license plate information A1; if the license plate information B1 is not empty, the license plate information C is consistent with the license plate information B1;
(8) the license plate information B comprises license plate information B1, and the license plate information A is empty; the vehicle is missed at the exit recognition center, and the license plate information C is consistent with the license plate information B1.
The invention adopts an inlet camera and an inlet recognition center to obtain license plate information B, adopts an outlet camera and an outlet recognition center to obtain license plate information A, and obtains accurate license plate information C through a self-adaptive intelligent checking and matching algorithm; the invention can greatly improve the accuracy of license plate recognition and can be widely applied to various systems for vehicle management.
The above description is only a preferred embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, so that all equivalent structural changes made by using the contents of the specification and the drawings of the present invention should be included in the scope of the appended claims.
Claims (9)
1. A method for improving the accuracy rate of recognizing a license plate at a lane entrance is characterized by comprising the following steps:
s01: when a vehicle enters a vehicle crossing, the entrance camera shoots a license plate image B and transmits the license plate image B to an entrance recognition center; the entrance recognition center calculates the license plate image B to obtain license plate information B; wherein the entrance recognition center recognizes less than or equal to 2 license plate information B within M seconds; m is greater than 0; the number of the entrance cameras is one, and a license plate image B shot by the entrance cameras comprises a time stamp of shooting time;
s02: the vehicle is driven out of the vehicle crossing, and the license plate image A is shot by the exit camera and is transmitted to the exit recognition center; the exit recognition center calculates the license plate image A to obtain license plate information A; the exit identification center identifies at least 3 license plate information A within 2M seconds; the number of the exit cameras is one, and a license plate image A shot by the exit cameras comprises a time stamp of shooting time;
s03: the license plate information B and the license plate information A are transmitted to a control center, and the control center adopts a self-adaptive intelligent checking matching algorithm to obtain accurate license plate information C;
when the license plate information B comprises license plate information B1, and the license plate information A comprises license plate information A1, license plate information A2 and license plate information A3, acquiring accurate license plate information C according to the following steps:
if the license plate information B1 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2 and the license plate information A1 is empty, the license plate information C is consistent with the license plate information B1; if the license plate information B1 is consistent with the license plate information A2 and the license plate information A1 is not empty, the license plate information C is consistent with the license plate information A1;
if the license plate information B1 is consistent with the license plate information A3, comparing time differences among adjacent license plate information in the license plate information A1, the license plate information A2 and the license plate information A3, and if the time differences are smaller than a time threshold, determining that the license plate information C is consistent with the license plate information A3; if the license plate information B1 is consistent with the license plate information A3, comparing time differences between adjacent license plate information in the license plate information A1, the license plate information A2 and the license plate information A3, and if at least one time difference is larger than a time threshold, comparing the time difference A between the license plate information A1 and the license plate information A221If the time difference A21If the time threshold value is smaller than the time threshold value, the license plate information C is consistent with the license plate information A2; otherwise, the license plate information C is consistent with the license plate information A1;
and if the license plate information B1 is not consistent with the license plate information A1, the license plate information A2 and the license plate information A3, comparing time differences among adjacent license plate information in the license plate information A1, the license plate information A2 and the license plate information A3, and if the time differences are smaller than a time threshold value, determining that the license plate information C is consistent with the license plate information A1.
2. The method for improving the identification accuracy of the license plate at the entrance of the lane according to claim 1, wherein when the license plate information B includes license plate information B1 and license plate information B2, and the license plate information a includes license plate information a1, license plate information a2 and license plate information A3, the accurate license plate information C is obtained according to the following steps:
if the license plate information B1 is consistent with the license plate information A1, and the license plate information B2 is consistent with the license plate information A2, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A1, and the license plate information B2 is consistent with the license plate information A3, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2, and the license plate information B2 is consistent with the license plate information A3, the license plate information C is consistent with the license plate information B1;
if only the license plate information B2 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B2;
if only the license plate information B1 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1.
3. The method for improving the identification accuracy of the license plate at the entrance of the lane according to claim 1, wherein when the license plate information B includes license plate information B1 and license plate information B2, and the license plate information a includes license plate information a1 and license plate information a2, the accurate license plate information C is obtained according to the following steps:
if the license plate information B1 is consistent with the license plate information A1, and the license plate information B2 is consistent with the license plate information A2, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2 and the license plate information B1 is empty, the license plate information C is consistent with the license plate information B2; if the license plate information B1 is consistent with the license plate information A2 and the license plate information B1 is not empty, otherwise, the license plate information C is consistent with the license plate information B1;
and if the license plate information B1, the license plate information B2, the license plate information A1 and the license plate information A2 are inconsistent, the license plate information C is consistent with the license plate information A1.
4. The method for improving the identification accuracy of the license plate at the entrance of the lane according to claim 1, wherein when the license plate information B includes license plate information B1 and license plate information B2, and the license plate information a includes license plate information a1, acquiring accurate license plate information C according to the following steps:
if the license plate information B1 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2, the license plate information C is consistent with the license plate information B1;
if the license plate information B2 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B2;
and if the license plate information B1 and the license plate information B2 are not consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1.
5. The method of claim 1, wherein when the license plate information B comprises license plate information B1 and license plate information B2, and the license plate information A is empty, then the license plate information C is consistent with the license plate information B1.
6. The method for improving the identification accuracy of the license plate at the intersection of the lane according to claim 1, wherein when the license plate information B comprises license plate information B1, and the license plate information A comprises license plate information A1 and license plate information A2, the method comprises the following steps of:
if the license plate information B1 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is consistent with the license plate information A2, the license plate information C is consistent with the license plate information B1;
and if the license plate information B1 is not consistent with the license plate information A1 and the license plate information A2, the license plate information C is consistent with the license plate information A1.
7. The method for improving the identification accuracy of the vehicle license plate at the lane entrance according to claim 1, wherein when the vehicle license plate information B comprises vehicle license plate information B1 and the vehicle license plate information A comprises vehicle license plate information A1, the method comprises the following steps of:
if the license plate information B1 is consistent with the license plate information A1, the license plate information C is consistent with the license plate information B1;
if the license plate information B1 is inconsistent with the license plate information A1 and the license plate information B1 is empty, the license plate information C is consistent with the license plate information A1; if the license plate information B1 is inconsistent with the license plate information A1 and the license plate information B1 is not empty, the license plate information C is consistent with the license plate information B1.
8. The method of claim 1, wherein when the license plate information B comprises license plate information B1 and the license plate information A is empty, the license plate information C is consistent with the license plate information B1.
9. An apparatus for improving the accuracy of recognizing the license plate at the entrance of a lane, which comprises a control center, an entrance camera positioned at the entrance of the lane, an entrance recognition center, an exit camera positioned at the exit of the lane, and an exit recognition center, and is used for executing the method for improving the accuracy of recognizing the license plate at the entrance of the lane according to any one of claims 1 to 8.
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