CN113744535B - Dynamic coordinate synchronization method and device for RFID (radio frequency identification) tag and video inspection vehicle - Google Patents
Dynamic coordinate synchronization method and device for RFID (radio frequency identification) tag and video inspection vehicle Download PDFInfo
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- CN113744535B CN113744535B CN202110976211.9A CN202110976211A CN113744535B CN 113744535 B CN113744535 B CN 113744535B CN 202110976211 A CN202110976211 A CN 202110976211A CN 113744535 B CN113744535 B CN 113744535B
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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
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/14—Traffic control systems for road vehicles indicating individual free spaces in parking areas
- G08G1/145—Traffic control systems for road vehicles indicating individual free spaces in parking areas where the indication depends on the parking areas
- G08G1/148—Management of a network of parking areas
Abstract
The invention discloses a dynamic coordinate synchronization device for an RFID (radio frequency identification) tag, and belongs to the technical field of roadside parking. The device comprises a camera, an RFID reading unit, a delayer and a processor. The camera is used for acquiring vehicle images of parked vehicles in a series of parking spaces, and the vehicle images comprise license plate information; the RFID reading unit is used for acquiring RFID tag information in the parking space, and the RFID tag information comprises parking space information; the delayer is used for delaying the RFID label information for a first time period and then sending the RFID label information to the processor; the processor is configured to perform dynamic coordinate synchronization matching on the license plate information and the RFID label information which are received simultaneously. By the dynamic regulation and control method, the time for the processor to receive the RFID label information is adjusted to be matched with the vehicle image receiving time, the error probability caused by time mismatching is reduced, and the identification rate of the equipment is improved.
Description
Technical Field
The invention relates to the technical field of roadside parking, in particular to a dynamic coordinate synchronization method and device for an RFID (radio frequency identification) tag and a video inspection vehicle.
Background
The video inspection vehicle owner aims at the management of parking spaces in roads, and is adapted to various complex environments through a mobile wide dynamic imaging technology to finish behaviors such as photographing, inspection, supervision, traffic dispersion and the like, record parking time and finally carry out parking charge management, so that the inspection efficiency is greatly improved, and meanwhile, inspection and evidence obtaining are carried out on roadside illegal parking, and law enforcement can be relied on.
A Radio Frequency Identification (RFID) tag and a high-definition camera are adopted for a patrol vehicle for roadside parking charge management, a picture is shot when the patrol vehicle enters the vicinity of a pre-collected optimal recognition position, license plate detection and recognition are carried out on the picture, and a recognition result is uploaded to a background. The patrol car can identify the corresponding RFID label through the chip buried in the specific place of the parking space when passing through the parking space, thereby realizing one-to-one correspondence between the car space number and the RFID. However, in the moving process of the inspection vehicle, delay is caused by the problems of sampling conversion time of the camera, network transmission delay, installation angle of the camera and the like, image shooting time is not matched with the RFID label due to the fact that the delay of the moving factors is amplified, large-area pictures are not matched with positions seriously, and large-area pictures cannot be identified or are identified wrongly.
For the problem that the camera is not matched with the identified rfid tag, the conventional method is usually improved from image transmission, such as better equipment, more complicated transmission mode, etc., and has high debugging difficulty and high consumption cost.
Disclosure of Invention
The embodiment of the application provides a dynamic coordinate synchronization method and device for RFID tags and a video patrol vehicle, and the corresponding time of RFID identification is finely adjusted to be matched with the time of a camera, so that the error probability caused by time mismatch is reduced, and the identification rate of equipment is improved.
The embodiment of the application provides a dynamic coordinate synchronization device for an RFID label, and the device comprises:
the system comprises a camera, a storage unit, a display unit and a control unit, wherein the camera is used for acquiring vehicle images of parked vehicles in a series of parking spaces, the vehicle images comprise license plate information, the series of vehicle images are images of the parked vehicles in the parking spaces shot by the camera in the process of moving along a specific direction, and the specific direction is vertical to the parking direction of the parked vehicles;
the RFID reading unit is used for acquiring RFID tag information in the parking space, and the RFID tag information comprises parking space information;
the time delay device is used for delaying the RFID label information for a first time period and then sending the information to the processor; and the number of the first and second groups,
and the processor is configured to perform dynamic coordinate synchronous matching on the license plate information and the RFID label information which are received simultaneously.
Further, the delayer is a singlechip.
Further, the processor is configured to extract a license plate number through the license plate information, and synchronously match the license plate number with the RFID label information.
Further, the processor is configured to re-determine the duration of the first time period when the same license plate number matches both of the RFID tag information.
Further, the processor is configured to: reading two pieces of RFID label information corresponding to the same license plate number, wherein the RFID label information also comprises the acquisition time of the RFID label; determining a first parking space and a second parking space according to the acquisition time of the RFID tag, wherein the first parking space is a parking space for parking the vehicle, and the second parking space is a matching staggered parking space; determining the first acquisition time and the last acquisition time of the RFID tag of the second parking space; and updating the duration of the first time period through the first acquisition time and the last acquisition time.
The embodiment of the application also provides a video inspection vehicle which is provided with the dynamic coordinate synchronization device for the RFID label, wherein the dynamic coordinate synchronization device is set in the claims.
The embodiment of the present application further provides a dynamic coordinate synchronization method for an RFID tag, which is applied to the aforementioned dynamic coordinate synchronization device, and the method includes:
acquiring vehicle images of parked vehicles in a series of parking spaces, wherein the vehicle images comprise license plate information, the series of vehicle images are images of the parked vehicles in the parking spaces shot in the process that the cameras move along a specific direction, and the specific direction is vertical to the parking direction of the parked vehicles;
acquiring RFID tag information in a parking space, wherein the RFID tag information comprises parking space information;
after the RFID label information in the parking space is acquired, the RFID label information is sent after a first time period is delayed;
and carrying out dynamic coordinate synchronous matching on the license plate information and the RFID label information.
Further, synchronously matching the license plate information with the RFID label information, comprising:
extracting the license plate number according to the license plate information;
and synchronously matching the license plate number with the RFID label information.
Further, the method further comprises:
and when the same license plate number is matched with the two pieces of parking space information, the duration of the first time period is determined again.
Further, determining the duration of the first time period comprises:
reading two pieces of RFID label information corresponding to the same license plate number, wherein the RFID label information also comprises the acquisition time of the RFID label;
determining a first parking space and a second parking space according to the acquisition time of the RFID tag, wherein the first parking space is a parking space for parking the vehicle, and the second parking space is a matching staggered parking space;
determining the first acquisition time and the last acquisition time of the RFID tag of the second parking space;
and updating the duration of the first time period through the first acquisition time and the last acquisition time.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
a dynamic coordinate synchronization device for RFID tags comprises a camera, an RFID reading unit, a time delay unit and a processor. The camera is used for acquiring vehicle images of parked vehicles in a series of parking spaces, and the vehicle images comprise license plate information; the RFID reading unit is used for acquiring RFID tag information in the parking space, and the RFID tag information comprises parking space information; the delayer is used for delaying the RFID label information for a first time period and then sending the RFID label information to the processor; the processor is configured to perform dynamic coordinate synchronous matching on the license plate information and the RFID label information which are received simultaneously. By the dynamic regulation and control method, the time for the processor to receive the RFID label information is adjusted to be matched with the vehicle image receiving time, the error probability caused by time mismatching is reduced, and the identification rate of the equipment is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of an application scenario of a video inspection vehicle;
FIG. 2 is a diagram illustrating recognition results with matching misalignment;
FIG. 3 is a system block diagram of a dynamic coordinate synchronization apparatus for RFID tags according to the present disclosure;
FIG. 4 is a schematic diagram of a video inspection vehicle identification result with a dynamic coordinate synchronization device installed;
FIG. 5 is a flow chart of a method of dynamic coordinate synchronization for RFID tags of the present disclosure;
fig. 6 is a flow chart of determining the duration of the first time period in the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
For the convenience of description of the embodiments, the application scenarios of the embodiments of the present disclosure are briefly introduced below. Fig. 1 is a schematic diagram of an application scenario of a video patrol car. Referring to fig. 1, when the video patrol car moves at a speed v in the illustrated direction, the camera acquires images of vehicles parked at parking spaces 1011, 1012 and 1013 at a certain frequency, and collects RFID tag information in parking spaces 1011, 1012 and 1013 during the movement to match the images of the vehicles.
Because the problems of sampling conversion time of the camera, network transmission delay, installation angle of the camera and the like cause time delay, and meanwhile, the video inspection vehicle moves to cause certain matching errors.
For example, 3 images of the vehicle in parking space 1011 and 3 images of the vehicle in parking space 1012 are acquired at points A1, A2, A3, A4, A5, and A6, respectively.
The image of the vehicle shot at the point A1 is received by the point B1 position processor, and at the moment, the RFID reading unit acquires the information of the RFID tag in the parking space as the parking space 1011, so that the matching is correct.
The image of the vehicle shot at the point A2 is received by the point B2 position processor, and at the moment, the RFID reading unit acquires the information of the RFID tag in the parking space as a parking space 1012, and the matching is staggered.
The image of the vehicle shot at the point A3 is received by the point B3 position processor, and at the moment, the RFID reading unit acquires the information of the RFID tag in the parking space as a parking space 1012, and the matching is staggered.
The following parking spaces, for example, the vehicle images of points A4, A5, and A6 corresponding to the parking space 1012, may also have the situations that the matching of point B4 is correct, and the matching of points B5 and B6 is wrong. Therefore, the large area of the picture is not matched with the position, and the large area of the picture cannot be identified or is identified wrongly.
Fig. 2 is a diagram showing the recognition result in which the matching misalignment occurs. As shown in fig. 2, the first 3 times of identification of the license plate number "hubei a23X17" are at parking space 1011, the last two times of identification are at parking space 1012, and matching dislocation occurs.
Fig. 3 is a system block diagram of a dynamic coordinate synchronization apparatus for RFID tags according to the present disclosure. As shown in fig. 3, a dynamic coordinate synchronization apparatus for RFID tags designed by the present disclosure includes a camera 101, an RFID reading unit 102, a time delay 103, and a processor 104. The camera 101 is used for acquiring a series of vehicle images, wherein the vehicle images comprise license plate information, the series of vehicle images are images of vehicles parked in parking spaces shot by the camera in the process of moving along a specific direction at a certain frequency, and the specific direction is vertical to the parking direction of the parked vehicles; the RFID reading unit 102 is configured to acquire RFID tag information in a parking space, where the RFID tag information includes parking space information; the delayer 103 is used for delaying the RFID tag information for a first time period and then sending the RFID tag information to the processor; the processor 104 is configured to perform dynamic coordinate synchronization matching of the license plate information and the RFID tag information received at the same time.
In the embodiment of the disclosure, the RFID tag information is delayed by the delayer 103 for a first time period and then sent to the processor 104, and the time for the processor 104 to receive the RFID tag information is adjusted to match the vehicle image receiving time, so that the error probability caused by time mismatch is reduced, and the identification rate of the device is improved. Compared with the traditional mode of reducing the transmission delay of the image and manually adjusting when mismatching occurs, the method is simple in structure, convenient to debug and high in matching rate.
Fig. 4 is a schematic diagram of a video inspection vehicle identification result with a dynamic coordinate synchronization device, and it can be seen that the identified license plate is basically bound with the parking space, and no excessive deviation occurs.
Alternatively, the camera 101 may be an RTSP (Real Time Streaming Protocol) network camera.
Alternatively, the camera 101 may capture images of the parked vehicle in the parking space at a frequency of 10 times/second to 20 times/second. The camera captures an image of a parked vehicle in a parking space that is moving in a direction that is perpendicular to the direction of parking the parked vehicle (see fig. 1), which is perpendicular to the road surface (i.e., the direction of movement of the video inspection vehicle), with the license plate of the parked vehicle facing the road surface.
In some embodiments, the time delay unit 103 may be a single chip, and specifically, the single chip is an integrated circuit chip composed of a CPU, a RAM, a ROM, a timer, and the like, and is connected to the device through a serial port. The delay effect is realized by setting delay forwarding on the singlechip. The single chip microcomputer is used for receiving and delaying forwarding of the RFID label information, testing and analyzing are carried out for several times, then the problem that the vehicle image is not matched with the RFID label information can be solved through background setting and adjustment, the control is simple, repeated debugging is not needed, and a large amount of manpower and material resources are saved.
Fig. 5 is a flowchart of a dynamic coordinate synchronization method for an RFID tag according to the present disclosure. The method is applicable to the dynamic coordinate synchronization device for the RFID tag shown in fig. 3, and referring to fig. 5, the method includes:
in step S100, vehicle images of parked vehicles in a series of parking spaces are acquired, the vehicle images including license plate information.
Specifically, the vehicle images of the parked vehicle in a series of parking spaces are acquired, and the camera moves at a certain speed along the parking direction of the vehicle and shoots at a certain frequency in the moving process.
When the vehicle image acquisition system is used, a plurality of cameras can shoot simultaneously, so that the vehicle image acquisition efficiency is improved. It can be understood that due to the problem of the installation angle of the camera, partial images which do not include license plate information appear in the shot vehicle images, and the images are not included in a series of acquired vehicle images and do not participate in subsequent processing, so that the overall processing efficiency is improved.
In step S200, RFID tag information in a parking space is acquired, where the RFID tag information includes parking space information.
Specifically, the RFID chip is buried in a specific place of the parking space, and when the parking space is patrolled and examined, the RFID reading unit can recognize corresponding RFID label information through the buried RFID chip, so that the parking space and the RFID label are in one-to-one correspondence.
The RFID tag information includes parking space information, which may include, for example, a serial number of a parking space, coordinates of the parking space, and a region name of the parking space.
In step S300, after the RFID tag information in the parking space is acquired, the RFID tag information is transmitted after a first time period is delayed.
When the parking space is patrolled and examined to become to pass through, RFID reading unit passes through the RFID chip of burying underground and discerns corresponding RFID label information, sends for the treater after delaying first time quantum through the delay timer.
Specifically, the duration of the first time period can be set in advance before the dynamic coordinate synchronizing device leaves the factory, and the dynamic coordinate synchronizing device can be directly used after leaving the factory without manual adjustment, so that manpower and material resources are greatly saved.
In step S400, dynamic coordinate synchronization matching is performed on the license plate information and the RFID tag information.
In some embodiments, synchronously matching license plate information with the RFID tag information may include:
in step S401, a license plate number is extracted from the license plate information.
The license plate information can be an image of a license plate in a vehicle image, and the license plate number is extracted through positioning and recognition of the license plate image in the vehicle image. For example, the positioning may be performed by using a pseudo-range measurement algorithm, and the identification may be performed by using a brand recognition rate algorithm.
In step S402, the license plate number and the RFID tag information are synchronously matched.
In practice, the license plate number and the RFID label information are synchronously matched, so that effective management of the parking space in the road is realized.
For example, as shown in fig. 4, the parking space information in the RFID tag information is that the parking space number 1011 corresponds to the license plate number of jaw a23X17, and the parking space number 1012 is null, which indicates that the vehicle is not parked in the parking space.
The RFID label information is sent after being delayed for the first time period, and the time for receiving the RFID label information is adjusted to be matched with the vehicle image receiving time, so that the error probability caused by time mismatching is reduced, and the identification rate of equipment is improved. Compared with the traditional mode of reducing the transmission delay of the image and manually adjusting when mismatching occurs, the method is simple in structure, convenient to debug and high in matching rate.
In some embodiments, the method further comprises:
in step S500, when the same license plate number matches with the two pieces of parking space information, the duration of the first time period is determined again.
When the same license plate number is matched with the two pieces of parking space information, the fact that the duration of the first time period of the dynamic coordinate synchronizing device is not appropriate is shown, so that delay is insufficient, and the RFID tag information of the subsequent parking space interferes with the RFID tag information of the front parking space. Therefore, a dynamic adjustment is required to re-determine the duration of the first time period.
Fig. 6 is a flowchart of determining a duration of a first time period, and as shown in fig. 6, the method may include:
in step S501, two pieces of RFID tag information corresponding to the same license plate number are read, where the RFID tag information further includes the time for acquiring the RFID tag.
In step S502, a first parking space and a second parking space are determined according to the acquisition time of the RFID tag, where the first parking space is a parking space where the vehicle parks, and the second parking space is a matching and dislocated vehicle.
In step S503, the first and last acquisition times of the RFID tag of the second bay are determined.
In step S504, the duration of the first time period is updated by the first acquisition time and the last acquisition time.
Through the duration of updating the first time period, dynamic adjustment is carried out when matching dislocation is found, the situation that the routing inspection needs to be carried out again after large-area matching dislocation occurs is avoided, and the routing inspection efficiency is improved.
The following describes a method for determining the duration of the first time period, taking the matching offset appearing in fig. 2 as an example:
in step S501, two pieces of RFID tag information corresponding to the same license plate number are read, where the RFID tag information further includes an acquisition time of an RFID tag.
As shown in fig. 2, vehicles with the license plate number "hubei a23X17" correspond to two pieces of RFID tag information, that is, parking spaces 1011 and 1012, respectively.
In step S502, a first parking space and a second parking space are determined according to the acquisition time of the RFID tag, where the first parking space is a parking space where the vehicle parks, and the second parking space is a matching and dislocated vehicle.
When the same license plate number is matched with the two pieces of parking space information, the time length of the first time period of the dynamic coordinate synchronization device is not appropriate, so that delay is insufficient, and the RFID label information of the subsequent parking space interferes with the RFID label information of the front parking space. Therefore, according to the acquisition time of the RFID tag, it can be determined that the preceding parking space 1011 is the first parking space where the parked vehicle is parked, and the parking space 1012 is the second matching-misplaced parking space.
In step S503, the first and last acquisition times of the RFID tag of the second bay are determined.
As shown in FIG. 2, the RFID tag of the second parking space 1012 has an acquisition time of 20210811T152959.870 — 20210811T152959.960.
In step S504, the duration of the first time period is updated by the first acquisition time and the last acquisition time.
The time duration for updating the first time period may be calculated to be 960-870=90ms according to the acquisition time of the RFID tag of the second seat 1012. By delaying the adjustment, the time length of the first time period for forwarding the RFID is further prolonged by 90ms, and the correct matching of the image and the RFID label information can be realized.
When the updating is realized, the updating also comprises the step of writing the time length of the updated first time period into the configuration file and transmitting the configuration file to the delayer, and the new time length of the first time period is directly used in the next operation.
When the time length of the first time period from the factory is determined, a first time period with rough matching may be defined, and the adjustment is performed by the method in step S500, so as to achieve automatic updating, find out a suitable delay parameter, and write the delay parameter as the first time period from the factory into the configuration file.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (4)
1. A dynamic coordinate synchronization apparatus for an RFID tag, the apparatus comprising:
the camera is used for acquiring a series of vehicle images, the vehicle images comprise license plate information, the series of vehicle images are images of parked vehicles in parking places shot by the camera in the moving process along a specific direction, and the specific direction is vertical to the parking direction of the parked vehicles;
the RFID reading unit is used for acquiring RFID tag information in the parking space, and the RFID tag information comprises parking space information;
the time delay device is used for delaying the RFID label information for a first time period and then sending the information to the processor; and (c) a second step of,
the processor is configured to extract the license plate number through the license plate information, perform dynamic coordinate synchronous matching on the license plate number and the RFID label information which are received simultaneously, and determine the duration of a first time period again when the same license plate number is matched with the two RFID label information;
the re-determining the duration of the first time period comprises:
reading two pieces of RFID label information corresponding to the same license plate number, wherein the RFID label information also comprises the acquisition time of the RFID label;
determining a first parking space and a second parking space according to the acquisition time of the RFID tag, wherein the first parking space is a parking space where the parked vehicle is parked, and the second parking space is a matching staggered parking space;
determining the first acquisition time and the last acquisition time of the RFID tag of the second parking space;
and updating the duration of the first time period through the first acquisition time and the last acquisition time.
2. The dynamic coordinate synchronization device of claim 1, wherein the delay is a single chip.
3. A video patrol car, characterized in that it is equipped with the dynamic coordinate synchronization device for RFID tags according to any of claims 1 or 2.
4. A dynamic coordinate synchronization method for an RFID tag, which is applied to the dynamic coordinate synchronization apparatus of claim 1, the method comprising:
acquiring vehicle images of parked vehicles in a series of parking spaces, wherein the vehicle images comprise license plate information, the series of vehicle images are images of the parked vehicles in the parking spaces shot in the process that the camera moves along a specific direction, and the specific direction is vertical to the parking direction of the parked vehicles;
acquiring RFID tag information in a parking space, wherein the RFID tag information comprises parking space information;
after the RFID label information in the parking space is obtained, the RFID label information is sent after a first time period is delayed;
extracting license plate numbers through the license plate information, and synchronously matching the license plate numbers with the RFID label information;
when the same license plate number is matched with the two pieces of parking space information, the duration of the first time period is determined again;
wherein determining the duration of the first time period comprises:
reading two pieces of RFID label information corresponding to the same license plate number, wherein the RFID label information also comprises the acquisition time of the RFID label;
determining a first parking space and a second parking space according to the acquisition time of the RFID tag, wherein the first parking space is a parking space for parking the vehicle, and the second parking space is a matching staggered parking space;
determining the first acquisition time and the last acquisition time of the RFID tag of the second parking lot;
and updating the duration of the first time period through the first acquisition time and the last acquisition time.
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