CN109948608B - License plate number recognition method, computer device and computer readable storage medium - Google Patents
License plate number recognition method, computer device and computer readable storage medium Download PDFInfo
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Abstract
The invention provides a license plate number recognition method, which comprises the steps of obtaining video signals, carrying out character recognition on each frame of license plate image signals in the video signals to form license plate number information, wherein each frame of license plate image signals corresponds to one license plate number information, dividing the same license plate number information into the same license plate number information groups, carrying out quantity statistics on each license plate number information group, judging whether a group of license plate number information groups with the largest quantity appear in the quantity statistics result, and if so, confirming the license plate number information groups with the largest quantity as final license plate number information. The invention also provides a computer device and a computer readable storage medium for realizing the method. The invention has the characteristic of accurately and effectively identifying the license plate number of the vehicle.
Description
Technical Field
The invention relates to the field of vehicle identification in parking lots, in particular to a vehicle number identification method, a computer device and a computer readable storage medium.
Background
The license plate is the main identity information of the vehicle, the common license plate is a physical license plate hung in front of and behind the vehicle, the license plate number on the license plate is composed of numbers and letters, in general, the method for identifying the identity of the vehicle in the parking lot is that a camera is arranged in the parking lot, when the vehicle enters the camera shooting range of the camera, the image signal of the vehicle is intercepted through the camera, and then the license plate number of the vehicle is identified through an identification device according to the image signal of the license plate, so that the identity information of the vehicle is identified. However, the accuracy of recognizing the license plate number of the vehicle by the recognition device according to the image information of the license plate is related to the performance of the recognition device, and the quality, the style, the specification, the size and the installation position of the license plate in a part of areas such as the China harbor and Australia area are not strictly unified standard, and furthermore, due to the conditions of narrow space, insufficient light and the like of the parking lot in the harbor and Australia area, the image information of the license plate intercepted by the camera is not clear enough, so that the situation that the identity information of the license plate cannot be recognized accurately occurs due to the fact that the performance of the recognition device is not high.
Disclosure of Invention
The first object of the present invention is to provide an accurate and effective license plate number recognition method.
A second object of the present invention is to provide a computer device for implementing the license plate number recognition method.
A third object of the present invention is to provide a computer-readable storage medium embodying the above license plate number recognition method.
In order to achieve the first objective, the present invention provides a license plate number recognition method, which includes obtaining video signals, performing character recognition on each frame of license plate image signals in the video signals to form a plurality of license plate number information, wherein each frame of license plate image signals corresponds to one license plate number information, dividing the same license plate number information into the same license plate number information groups, performing quantity statistics on each license plate number information group, judging whether a group of license plate number information groups with the largest quantity appear in the numerical control statistics result, and if so, confirming the license plate number information groups with the largest quantity as final license plate number information.
In view of the above, the video signal of the license plate is acquired through the image pickup device, and then character recognition is performed on each frame of license plate image signal in the video signal through the recognition device such as the OCR optical character recognition device, so as to form the license plate number information corresponding to each frame of license plate image signal. Then, the same license plate number information is divided into the same license plate number information groups, the number statistics is carried out on each license plate number information group, and the license plate number information group with the largest number is confirmed to be the final license plate number information, so that the problem that the recognition result is affected due to the fact that the license plate image information partially recognized is wrong because of the fact that the environment factors of a parking lot and the recognition performance of a recognition device are not high is avoided, and the purpose of accurately and effectively recognizing the license plate number is achieved.
In a further scheme, if more than two license plate number information groups with the same maximum number appear in the result of the number statistics, each license plate number information group in the more than two license plate number information groups with the same number is marked as a fuzzy license plate number information unit respectively, and each fuzzy license plate number information unit is sent to a database respectively.
It can be seen that, when more than two license plate number information groups with the same maximum number appear in the number statistics result, it indicates that the license plate number information correspondingly identified by the multi-frame license plate image signal is wrong, and each license plate number information group in the more than two license plate number information groups with the same maximum number is marked as a fuzzy license plate number information unit and sent to the database for processing.
The further scheme is that after each fuzzy license plate number information unit is respectively sent to a database, the method is executed: and respectively reading the main license plate number information associated with each fuzzy license plate number information unit from the database, and judging whether unique common main license plate number information exists between each fuzzy license plate number information unit.
The main license plate number information associated with the fuzzy license plate number information unit is stored in the database, so that the fuzzy license plate number information unit can be further and accurately identified through the database.
If the unique common main license plate number information exists between each fuzzy license plate number information unit, adding the main license plate number information into the quantity statistics according to the preset quantity to carry out the quantity re-statistics.
It can be seen that the common main license plate number information exists between each fuzzy license plate number information unit, so that the probability that the main license plate number information is the final license plate number information is high, and the license plate number is effectively identified by adding the main license plate number information into the quantity statistics according to the preset quantity to carry out the quantity statistics again.
The further scheme is that after the license plate number information of the main license plate and more than two license plate number information groups with the same maximum number are counted again, the method is executed: judging whether license plate number information groups which are the same as the main license plate number information exist in the re-number statistics, if so, adding the preset number to the license plate number information groups which are the same as the main license plate number information, and confirming a group of license plate number information groups with the largest number as final license plate number information in the re-number statistics result.
Therefore, if the license plate number information group which is the same as the main license plate number information exists in the process of counting the re-number, the number of the main license plate can be cast into the license plate number information which is the same as the main license plate number information.
If no unique common main license plate number information exists between each fuzzy license plate number information unit, prompt information is sent out, multi-frame license plate image signals corresponding to each fuzzy license plate number information unit are displayed, input final license plate number information is received, the received input final license plate number information is marked as the main license plate number information, and each fuzzy license plate number information unit is respectively associated with the main license plate number information and then is sent to a database for storage.
Further, the method for obtaining the video signal includes: a high definition video signal is acquired.
It can be seen that the accuracy of the identification is further improved by acquiring a high definition video signal.
The further scheme is that after the license plate number information group with the largest number is confirmed as the final license plate number information, the method is executed: and displaying the final license plate number information.
Therefore, the final license plate number information is displayed, so that parking lot association personnel can conveniently check the identity information of the vehicle.
In order to achieve the second object, the present invention further provides a computer device further comprising a processor and a memory, wherein the memory stores a computer program, and the computer program realizes each step of the license plate number recognition method when executed by the processor.
In order to achieve the third object, the present invention further provides a computer readable storage medium storing a computer program, which when executed by a processor, implements the steps of the license plate number recognition method.
Drawings
Fig. 1 is a flowchart of an embodiment of a license plate number recognition method according to the present invention.
The invention is further described below with reference to the drawings and examples.
Detailed Description
The invention provides a license plate number recognition method, which is applied to terminal equipment capable of acquiring video signals, typically applied to terminal equipment such as a computer, etc., wherein the computer device of the invention can be the electronic equipment, and the computer readable storage medium can be various storage media with a data storage function, such as a FLAASH, EEPROM nonvolatile memory, etc.
License plate number recognition method embodiment:
the preferred terminal device in this embodiment is a terminal device such as a desktop computer or a server.
Referring to fig. 1, the method first executes step S1 to obtain a video signal, and after character recognition is performed on each frame of license plate image signal in the video signal, a plurality of license plate number information is formed. For example, a video signal of a license plate is acquired through an image pickup device, character recognition is performed on each frame of license plate image signal in the video signal through a recognition device such as an OCR optical character recognition device, a plurality of license plate number information is formed, and each frame of license plate image signal corresponds to one license plate number information. Wherein acquiring the video signal includes acquiring a high-definition video signal, for example, by setting the definition of the image pickup device to a high-definition version definition.
And then, executing step S2, dividing the same license plate number information into the same license plate number information groups, and counting the number of each license plate number information group. The number of the same license plate number information in each license plate number information group is the number value obtained by counting the number of the license plate number information.
And then, executing the step S3, judging whether a group of license plate number information groups with the largest number appear in the counting result, if so, executing the step S4, and confirming the license plate number information with the largest number as final license plate number information. Therefore, the number of identical license plate number information in the license plate number information group with the largest number can be confirmed, namely, the frequency of the multi-frame identical license plate image signals corresponding to the license plate number information group in a video signal is the highest, and the license plate number information group is confirmed as final license plate information.
If more than two license plate number information groups with the same maximum number appear in the number statistics result, executing step S5, marking each license plate number information group in the license plate number information with the same maximum number as a fuzzy license plate number information unit, and respectively sending each fuzzy license plate number information unit to a database. In this embodiment, the database is a database of the terminal device itself, and the database stores the main license plate number information associated with each fuzzy license plate number information unit. It can be seen that, when more than two license plate number information groups with the same maximum number appear in the result of the number statistics, the final license plate information cannot be effectively identified, and the purpose of further identifying the fuzzy license plate number information units is achieved by marking each license plate number information group in more than one license plate number information with the same maximum number as a fuzzy license plate number information unit and respectively sending each fuzzy license plate number information unit to the database.
Then, step S6 is executed to read the main license plate number information associated with each fuzzy license plate number information unit from the database. The method comprises the steps of respectively sending each fuzzy license plate number information unit to a database, and then respectively searching the main license plate number information associated with each fuzzy license plate number information unit according to each fuzzy license plate number information unit by the database, so that the main license plate number information corresponding to each fuzzy license plate number information unit can be respectively read from the database.
Then, step S7 is executed to determine whether the main license plate number information associated with each fuzzy license plate number information unit has common main license plate number information. If yes, executing step S8, adding the number information of the main license plate number into the number statistics according to the preset number to carry out the re-number statistics. In this embodiment, after a plurality of unrecognizable fuzzy license plate number information units appear, final license plate number information obtained after a plurality of frame license plate image signals corresponding to the fuzzy license plate number information units are finally identified by a parking lot manager, the final license plate number information identified manually is marked as main license plate information, and the main license plate information identified manually and the plurality of unrecognizable fuzzy license plate number information units are respectively associated and then sent to a waiting database for storage. Therefore, if the main license plate number information associated with each fuzzy license plate number information unit is judged to have common main license plate number information, the main license plate number information is associated with a plurality of fuzzy license plate number information units which cannot be identified, the probability that the main license plate number information is final license plate number information is high, and the main license plate number information can be added into the quantity statistics in a preset quantity to carry out the quantity statistics again.
If no unique common main license plate number information exists between each fuzzy license plate number information unit, executing step S12, sending prompt information, displaying multi-frame license plate image signals corresponding to each fuzzy license plate number information unit, receiving input final license plate number information, marking the received input final license plate number information as the main license plate number information, respectively associating each fuzzy license plate number information unit with the main license plate number information, and sending the association to a database for storage. In this way, when a plurality of unrecognizable fuzzy license plate number information units appear, prompt information is sent out, for example, a device such as a loudspeaker sends out prompt voice or a light emitting device reminds, a manager in a parking lot is reminded that a plurality of unrecognizable fuzzy license plate number units appear, and multi-frame license plate image signals corresponding to each fuzzy license plate number information unit are displayed, so that final license plate number information is identified manually. Preferably, each fuzzy license plate number information unit is respectively associated with the main license plate number information and then is sent to the database for storage, so that the data information in the database is increased, and the accuracy of identifying the final license plate number information can be increased through the main license plate number information associated with the fuzzy license plate number information unit information when a plurality of fuzzy license plate number information units which cannot be identified next appear.
Next, step S9 is executed to determine whether the license plate number information set identical to the main license plate number information exists in the recommendable statistics. If yes, step S10 is executed, the preset number of the main license plate number information is added to the license plate number information group identical to the main license plate number information, and the license plate number information group with the largest number is confirmed as the final license plate number information group in the result of the statistics of the re-number. In this embodiment, since the probability that the main license plate number information is the final license plate number information is relatively high, the preset number of the main license plate number information may be set to a relatively high number, for example, the maximum number in the previous number statistics is 8, and then the preset number of the main license plate number information may be set to 8 or 7 and added to the new number statistics. Therefore, the license plate number information group which is the same as the main license plate number information exists in the statistics of the re-number, and the preset number of the main license plate number information is added to the license plate number information group which is the same as the main license plate number information, so that the purpose of accurately and effectively identifying the final license plate number information group is achieved.
If the license plate number information group with the same main license plate number information does not exist in the statistics of the re-number, executing step S12, sending prompt information, displaying multi-frame license plate image signals corresponding to each fuzzy license plate number information unit, receiving input final license plate number information, marking the received input final license plate number information as the main license plate number information, and respectively associating each fuzzy license plate number information unit with the main license plate number information and then sending the information to a database for storage.
Finally, step S11 is executed to display the final license plate number information. Thus, the manager of the parking lot can view the license plate number of the vehicle on the display interface of the terminal device.
As can be seen from the foregoing, in this embodiment, the license plate number information corresponding to each frame of license plate image information in the video signal is divided into the same license plate number information group, when more than one license plate number information group with the same maximum number appears in the process of counting the number of the plurality of license plate number information groups, a plurality of unrecognizable fuzzy license plate number information units appear, the unrecognizable fuzzy license plate number information units are sent to the database, the main license plate number information associated with the fuzzy license plate number information units is read from the database, and the existence of common main license plate number information among the fuzzy license plate number units is judged and added to the number statistics, so that the purpose of accurately and effectively recognizing the final license plate number information, namely the license plate number of the vehicle is achieved. Therefore, errors of part of the identified license plate image information due to the influence of the environmental factors of the parking lot and the low identification performance of the identification device are avoided, and errors of the identified final license plate number information are avoided.
Computer apparatus embodiment:
the computer device of the present embodiment includes a processor, a memory, and a computer program stored in the memory and executable on the processor, for example, a computer processing program for implementing the above-described information processing method. The processor implements the steps of the license plate number recognition method when executing the computer program.
For example, a computer program may be split into one or more modules, which are stored in memory and executed by a processor to perform the various modules of the invention. One or more of the modules may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the terminal device.
It should be noted that the terminal device may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, and the like. The terminal device may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that the schematic diagram of the present invention is merely an example of a terminal device and is not limiting of the terminal device, and may include more or less components than those illustrated, or may combine some components, or different components, e.g., the terminal device may also include an input-output device, a network access device, a bus, etc.
The processor referred to in the present invention may be a central processing unit (Central Processing Unit, CPU), or other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being a control center of the terminal device, and the various interfaces and lines being used to connect the various parts of the overall terminal device.
The memory may be used to store computer programs and/or modules, and the processor may implement various functions of the terminal device by running or executing the computer programs and/or modules stored in the memory, and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
Computer-readable storage medium:
the modules integrated in the terminal device may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as a stand alone product. Based on such understanding, the present invention may implement all or part of the procedures in the methods of the above embodiments, or may be implemented by instructing related hardware by a computer program, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of the license plate number identification method when executed by a processor.
Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the content of the computer readable medium can be appropriately increased or decreased according to the requirements of the jurisdiction's jurisdiction and the patent practice, for example, in some jurisdictions, the computer readable medium does not include electrical carrier signals and telecommunication signals according to the jurisdiction and the patent practice.
It should be noted that the foregoing is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made to the present invention by using the concept are also included in the scope of the present invention.
Claims (7)
1. A method for identifying a license plate number, comprising:
acquiring a video signal, performing character recognition on each frame of license plate image signal in the video signal, and forming a plurality of license plate number information, wherein each frame of license plate image signal corresponds to one license plate number information;
dividing the same license plate number information into the same license plate number information groups, and counting the number of each license plate number information group;
judging whether a group of license plate number information groups with the largest number appear in the counting result, if so, confirming the license plate number information groups with the largest number as final license plate number information;
if more than two license plate number information groups with the same maximum number appear in the counting result, marking each license plate number information group in the more than two license plate number information groups with the same number as a fuzzy license plate number information unit respectively, and sending each fuzzy license plate number information unit to a database respectively;
respectively reading the main license plate number information associated with each fuzzy license plate number information unit from the database, and judging whether unique common main license plate number information exists between each fuzzy license plate number information unit;
if the unique common main license plate number information exists between each fuzzy license plate number information unit, adding the main license plate number information into the number statistics result according to the preset number to carry out the re-number statistics.
2. The method for identifying a license plate number according to claim 1, wherein:
and after the license plate number information of the main license plate and the license plate number information groups with the same number as more than two groups and the maximum number are counted again, executing: judging whether license plate number information groups identical to the main license plate number information exist in the result of the re-number statistics, if so, adding the preset number to the license plate number information groups identical to the main license plate number information, and confirming a group of license plate number information groups with the largest number as final license plate number information in the result of the re-number statistics.
3. The method for identifying a license plate number according to claim 1, wherein:
if no unique common main license plate number information exists between each fuzzy license plate number information unit, prompt information is sent out, multi-frame license plate image signals corresponding to each fuzzy license plate number information unit are displayed, input final license plate number information is received, the received input final license plate number information is marked as the main license plate number information, and each fuzzy license plate number information unit is respectively associated with the main license plate number information and then is sent to a database for storage.
4. A method of identifying a license plate number according to any one of claims 1 to 3, wherein:
the acquiring the video signal includes: a high definition video signal is acquired.
5. A method of identifying a license plate number according to any one of claims 1 to 3, wherein:
after confirming the license plate number information group with the largest number as the final license plate number information, executing: and displaying the final license plate number information.
6. Computer device, characterized in that it comprises a processor and a memory, said memory storing a computer program which, when executed by the processor, implements the steps of the license plate number recognition method according to any one of claims 1 to 5.
7. A computer readable storage medium having stored thereon a computer program characterized by: the computer program, when executed by a processor, performs the steps of the license plate number recognition method of any one of claims 1 to 5.
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| CN114038207B (en) * | 2021-11-03 | 2023-01-03 | 上海途虎信息技术有限公司 | Guest welcoming method, computer readable storage medium and device |
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| US20140072177A1 (en) * | 2012-09-12 | 2014-03-13 | Pei-Yuan Chou | Methods for Identifying Vehicle License Plates |
| TWI497422B (en) * | 2012-12-25 | 2015-08-21 | Univ Nat Chiao Tung | A system and method for recognizing license plate image |
| CN103824066B (en) * | 2014-03-18 | 2017-10-10 | 厦门翼歌软件科技有限公司 | A kind of licence plate recognition method based on video flowing |
| CN104573637B (en) * | 2014-12-18 | 2020-11-03 | 厦门翼歌软件科技有限公司 | License plate recognition method based on multiple cameras |
| CN104504906B (en) * | 2014-12-25 | 2017-09-19 | 深圳市捷顺科技实业股份有限公司 | A kind of licence plate recognition method and system |
| CN205827661U (en) * | 2016-06-06 | 2016-12-21 | 石家庄商立智能科技有限公司 | Car license recognition passes through device automatically |
| CN107730896A (en) * | 2016-08-31 | 2018-02-23 | 西安艾润物联网技术服务有限责任公司 | Licence plate recognition method and device |
| CN106778743A (en) * | 2016-12-12 | 2017-05-31 | 深圳市捷顺科技实业股份有限公司 | A kind of improved car plate voting method and device |
| CN107665585B (en) * | 2017-09-21 | 2020-11-03 | 浙江志诚软件有限公司 | License plate number acquisition method and system |
| CN108197625A (en) * | 2017-12-18 | 2018-06-22 | 北京云星宇交通科技股份有限公司 | A kind of method and system for correcting Car license recognition |
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Effective date of registration: 20221118 Address after: Room 105, No. 6, Baohua Road, Hengqin New District, Zhuhai City, Guangdong Province, 519000 - 34312 (centralized office area) Applicant after: ZHUHAI QUANXINTONG TECHNOLOGY CO.,LTD. Address before: 528454 area a, floor 5, building a, Linhai plant, Cuicheng Road, Linhai Industrial Park, Cuiheng new area, Zhongshan City, Guangdong Province Applicant before: ZHONGSHAN ANXINTONG ROBOT MANUFACTURING Co.,Ltd. |
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