CN109360440B - Parking lot management method and parking lot management equipment based on ad hoc network - Google Patents
Parking lot management method and parking lot management equipment based on ad hoc network Download PDFInfo
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- CN109360440B CN109360440B CN201811228834.2A CN201811228834A CN109360440B CN 109360440 B CN109360440 B CN 109360440B CN 201811228834 A CN201811228834 A CN 201811228834A CN 109360440 B CN109360440 B CN 109360440B
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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
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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
- G08G1/149—Traffic control systems for road vehicles indicating individual free spaces in parking areas coupled to means for restricting the access to the parking space, e.g. authorization, access barriers, indicative lights
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Abstract
The invention discloses a parking lot management method and a parking lot management device based on an ad hoc network, wherein a license plate recognition device (which can be an exit device or an entrance device) and a license plate recognition device (which can be an exit device or an entrance device) are in communication connection through the same networking, the network structure synchronizes information data of all entrance devices and all exit devices, when the exit device recognizes a license plate number, whether a record of the license plate number exists is searched according to the record of the entrance device, and then parking information is synthesized. The invention can realize decentralization and real unattended operation, and greatly saves cost.
Description
Technical Field
The invention relates to the technical field of license plate recognition, in particular to a parking lot management method and parking lot management equipment based on an ad hoc network.
Background
The parking lot management system is a network system for managing vehicle access in the parking lot, traffic flow guidance in the parking lot and parking fee collection, and is a necessary tool for professional parking lot management companies. The system realizes the dynamic and static comprehensive management of vehicle access and vehicle in-and-out through acquiring and recording the vehicle access record and the position in the field. The system can automatically record the vehicle access information, and complete the functions of charging strategy realization, charging accounting management, lane equipment control and the like through management software.
The parking lot management system generally comprises an exit device, an entrance device and a central server, wherein the exit device and the entrance device are both central servers to form a star-structured network taking the central servers as centers. However, this system has the following disadvantages:
1) the core service processing data storage and the like can only be processed by the central server, and the damage of the central server can cause the whole system to be paralyzed.
2) The detection of the parking lot entrance/exit information must be performed by the central server.
3) Although a single egress and ingress device can perform some simple business processing, information between different devices needs to be comprehensively processed by a central server.
4) In the absence of a central server, the separate egress and ingress devices have no way to handle the traffic efficiently because they are unaware of the existence of the other egress and ingress devices.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the parking lot management method and the parking lot management equipment based on the ad hoc network are provided, the decentralization can be realized, the real unattended operation can be realized, and meanwhile, the cost is greatly saved.
In order to solve the technical problems, the invention adopts a technical scheme that: the parking lot management method based on the ad hoc network comprises the following steps: step S1: the entrance equipment of each entrance and the exit equipment of each exit of the parking lot are in communication connection through the same networking, the entrance equipment of the same entrance is grouped, and the exit equipment of the same exit is grouped; step S2: the entrance equipment identifies the license plate of the entrance vehicle to obtain an entrance license plate number; step S3: the entrance device inquires whether the same unused local license plate number exists, if the same unused local license plate number does not exist, the step S4 is executed, otherwise, the step S6 is executed, wherein the unused local license plate number is: a license plate number that is recognized by the inlet device and stored locally but not recognized by the outlet device; step S4: the access device judges whether other access devices exist in the group, if so, the step S5 is executed; otherwise, executing step S8; step S5: the entrance equipment inquires whether other entrance equipment has the same unused local license plate number, if so, the step S6 is executed, otherwise, the step S8 is executed; step S6: the entrance equipment judges whether the confidence of the entrance license number is greater than the confidence of the local license number, if so, the step S7 is executed, otherwise, the step S8 is executed; step S7: the entrance equipment updates entrance license plate information and broadcasts the entrance license plate information to all exit equipment, wherein the entrance license plate information comprises entrance license plate numbers and entrance time; step S8: the entrance equipment generates entrance license plate information and stores the entrance license plate information locally; step S9: the exit equipment identifies the license plate of the exit vehicle to obtain an exit license plate number; step S10: the exit equipment searches whether the exit license number is recorded according to the received entrance license information, and if not, the step S11 is executed; otherwise, executing step S13; step S11: the exit device inquires whether the entrance device stores the record of the exit license number, if not, the step S12 is executed; otherwise, go to step S13; step S12: the exit device generates a piece of vehicle entry information using the default record; step S13: and the exit equipment generates parking information according to the entrance license plate information and the departure time or according to the vehicle entrance information and the departure time, and informs all the entrance equipment and the exit equipment of updating the entrance license plate information corresponding to the exit license plate number.
Preferably, the step of updating the entrance license plate information by the entrance device specifically includes: and comparing the confidence degrees of the entrance license plate numbers by the entrance devices in the same group, updating the entrance license plate information by the entrance devices with higher confidence degrees, and discarding the entrance license plate information by the entrance devices with lower confidence degrees.
Preferably, in step S9: when a plurality of outlet devices in the same group exist at the same outlet and are on line at the same time, and the outlet devices in the same group identify outlet license numbers at the same time, the outlet devices in the same group compare the confidence degrees of the outlet license numbers, the outlet device with the maximum confidence degree retains the outlet license number, and the residual outlet devices discard the outlet license number; and when the exit equipment in the same group is not on line, selecting one exit equipment to inquire whether the same license plate number exists in the local cache or not, and if the same license plate number does not exist, outputting a default value.
Preferably, the entrance license plate information stored by the entrance device is mutually exclusive with the entrance license plate information stored by other entrance devices; the exit license plate numbers stored by the exit equipment and the exit license plate numbers stored by other exit equipment are mutually exclusive.
Preferably, the parking lot management method further includes performing service data processing according to the parking information.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided an ad hoc network based parking lot management device comprising a processor and a storage medium storing a plurality of instructions adapted to be loaded and executed by the processor to carry out the steps of the parking lot management method according to any one of claims 1 to 5.
In summary, by adopting the above technical solution, the parking lot management method and the parking lot management device based on ad hoc network of the present invention connect the license plate recognition device (which may be an exit device or an entrance device) and the license plate recognition device (which may be an exit device or an entrance device) through the same networking communication, the network structure synchronizes information data of all the entrance and exit devices, when the exit device recognizes a license plate number, it searches whether there is a record of the license plate number according to the record of the entrance device, and then synthesizes parking information; the central server in the prior art is weakened, the importance range is reduced, and other services irrelevant to the data of the license plate recognition equipment are processed, so that decentralization can be realized, real unattended operation is realized, and the cost is greatly saved.
Drawings
Fig. 1 is a schematic flow chart of a part of a parking lot management method based on an ad hoc network according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of another part of the ad hoc network-based parking lot management method according to the embodiment of the present invention.
Fig. 3 is a schematic view of an application scenario of the parking lot management method based on the ad hoc network according to the embodiment of the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
As shown in fig. 1 and fig. 2, in the embodiment of the present invention, the method for managing a parking lot based on an ad hoc network includes the following steps:
step S1: the entrance equipment of each entrance and the exit equipment of each exit of the parking lot are in communication connection through the same networking, the entrance equipment of the same entrance is grouped, and the exit equipment of the same exit is grouped.
All the entrance devices and the exit devices can be connected to the same switch in a wired or wireless mode to form a local area network, successful multicast search is guaranteed, networking is carried out, and a parking lot local area network is established. After networking, ingress devices of the same ingress may be grouped according to IP address, and egress devices of the same egress may be grouped.
Step S2: and the entrance equipment identifies the license plate of the entrance vehicle to obtain the entrance license plate number.
Step S3: the entrance equipment inquires whether the same unused local license plate number exists, if the same unused local license plate number does not exist, the step S4 is executed, otherwise, the step S6 is executed;
step S4: the access device judges whether other access devices exist in the group, if so, the step S5 is executed; otherwise, executing step S8;
step S5: the entrance equipment inquires whether other entrance equipment has the same unused local license plate number, if so, the step S6 is executed, otherwise, the step S8 is executed;
step S6: the entrance equipment judges whether the confidence of the entrance license number is greater than the confidence of the local license number, if so, the step S7 is executed, otherwise, the step S8 is executed;
step S7: the entrance equipment updates entrance license plate information and broadcasts the entrance license plate information to all exit equipment, wherein the entrance license plate information comprises entrance license plate numbers and entrance time;
step S8: the entrance equipment generates entrance license plate information and stores the entrance license plate information locally;
step S9: the exit equipment identifies the license plate of the exit vehicle to obtain an exit license plate number;
step S10: the exit equipment searches whether the exit license number is recorded according to the received entrance license information, and if not, the step S11 is executed; otherwise, executing step S13;
step S11: the exit device inquires whether the entrance device stores the record of the exit license number, if not, the step S12 is executed; otherwise, go to step S13;
step S12: the exit device generates a piece of vehicle entry information using the default record;
step S13: and the exit equipment generates parking information according to the entrance license plate information and the departure time or according to the vehicle entrance information and the departure time, and informs all the entrance equipment and the exit equipment of updating the entrance license plate information corresponding to the exit license plate number.
Wherein, the unused local license plate number is: a license plate number that is recognized by the ingress device and stored locally but not recognized by the egress device. That is, after a vehicle passes through an entrance, the entrance device recognizes the license plate number of the vehicle and stores the license plate number locally, and when the vehicle does not pass through the exit or passes through the exit, the exit device performs a false check, but does not recognize the license plate number of the vehicle, so that the license plate number is not recognized by the exit device at the exit.
Further, after step S13, the method further includes:
and processing the service data according to the parking information. The service data is e.g. calculation, payment, collection of parking fees etc.
In this embodiment, the step of updating the entrance license plate information by the entrance device specifically includes: and comparing the confidence degrees of the entrance license plate numbers by the entrance devices in the same group, updating the entrance license plate information by the entrance devices with higher confidence degrees, and discarding the entrance license plate information by the entrance devices with lower confidence degrees.
In the present embodiment, in step S9: when a plurality of outlet devices in the same group exist at the same outlet and are on line at the same time, and the outlet devices in the same group identify outlet license numbers at the same time, the outlet devices in the same group compare the confidence degrees of the outlet license numbers, the outlet device with the maximum confidence degree retains the outlet license number, and the residual outlet devices discard the outlet license number; and when the exit equipment in the same group is not on line, selecting one exit equipment to inquire whether the same license plate number exists in the local cache or not, and if the same license plate number does not exist, outputting a default value.
In this embodiment, the entrance license plate information stored by the entrance device is mutually exclusive with the entrance license plate information stored by other entrance devices; the exit license plate numbers stored by the exit equipment and the exit license plate numbers stored by other exit equipment are mutually exclusive.
Since the parking lot management system may need to maintain, replace or increase or decrease the exit and entrance devices at any time, the exit and entrance devices of the network are required to be configured, so as to update Vzid information of all the exit and entrance devices, thereby completing synchronous configuration.
The specific process of synchronous configuration comprises the following steps:
step 1: all the equipment continuously broadcasts the self serial number Sn and the self IP address;
step 2: establishing corresponding independent processing terminals based on all equipment of a parking lot network, and performing at least three-layer tree structure setting on equipment with different IP addresses and serial numbers by any processing terminal according to the type of an entrance and an exit of the parking lot, namely correspondingly setting equipment names, equipment types, groups and equipment networking states;
wherein, three layers of tree structures are provided; the first layer is a root node root and represents a device group, and the second layer is a sub-group, namely a device type, and devices belonging to the same group can be grouped in the same sub-group; the third layer is specific equipment under the sub-packet; the three-layer block coding numbers are all coded by Base 64; two devices can be connected when belonging to a root device group; the sub-groups represent the inlet devices of the same inlet or the outlet devices of the same outlet;
and step 3: when broadcasting is carried out after Vzid information configuration of a certain device is finished, other devices in the same local area network update the Vzid information of the device according to the local group list of the device, and synchronous configuration is finished; the Vzid information comprises an IP address, a serial number, an equipment name, an equipment type, an equipment group and an equipment networking state of the equipment;
when a new device is searched by the network of the parking lot, whether the two devices are interconnected is judged according to the device networking state of the new device, wherein the device networking state is related to the device type, and when the device type is an entrance device type or an exit type, the networking state is effective; when the device type is unknown, the networking state is unavailable;
further, the method also comprises the following conditions that the equipment is disconnected: when a certain device is disconnected, the corresponding processing terminal automatically changes the device type corresponding to the device into an undefined type, and the networking state of the device is an unavailable state.
Furthermore, the group list also comprises an update time for indicating how long the latest update time of the group list is, so that the subsequent equipment can conveniently compare and update; the initial value of the update time is 0, which indicates that the update is not performed.
Further, the method also comprises a time synchronization implementation process: all devices are based on the device time with the smallest serial number in the parking lot network devices.
When the equipment initially joins in networking, only the ip address and the serial number of the equipment are known, and other Vzid information is in an unset unavailable state;
each device has its own name, which is used to mark the presence of the device. The device networking function can be closed, although one device has the device networking function, the device is closed by default, and the device does not need to be connected immediately after searching for the device. It is therefore necessary to notify the searched devices of the current device status when the devices are multicast in the network.
The name of each device is currently defined as vzid, which is used to label this device. He uses the data format of Json, as follows:
{
"vzid":{
"ip_addr":"192.168.4.137",
"name":"ABCED",
"sn":"XXXXXXXX-XXXXXXXX",
"type":"input",
"enable_group":"true"
}
}
where IP _ addr is the IP address of the device itself. If the names of the two devices are the same and the types of the two devices are the same in the whole networking, the two devices can be judged to be the two devices of the same gateway.
Sn is also the serial number of the current device.
The device name is set according to whether the name is set at the same input port. For example, the name of the device is expressed in the form of root & name01& name02& name 03. Only the devices with the same root can count the devices in the same group, and the devices are connected with each other.
Type is the Type of device, and there are currently only three types: input ingress devices, output egress devices and undefined types of unbown. This information is saved to a configuration file and is read each time the device is started. Initially, the type of device is undefined (un) and the user should configure this information at the first use.
enable _ group indicates whether to join the networking. The information indicates whether the current equipment can be added into networking information, and the networking program can judge whether the current equipment needs to be connected and information synchronization through the information.
Of the above information, the two pieces of information, ip _ addr and sn, are obtained through interfaces at other places of the device, and are not stored in a configuration file in the future. The initial value of the name may be a random value, but may also be obtained through an interface at other places, and a future user may customize the setting, and after the setting, the information will be stored in a configuration file, and when a future device networking application is started, the information will be directly read in the configuration file. the type and the enable _ group have certain correlation, if the type of the current device is unbown, the value of the enable _ group is ignored, and any device which is searched for and is of the type of unbown cannot join the device into the network. Only when the type is valid, the function of device networking will be valid.
Normally the value sn is never changed and can be used to mark and distinguish uniqueness of the device.
vzid information includes the IP address, serial number, device name, device type, device group (ingress device of the same group or egress device of the same group), and device networking status (networking status refers to joining networking status or unavailable status, and through this information, it can be judged whether the current device needs to be connected and information synchronization).
Referring to fig. 3, it is an application scenario of the parking lot management method of this embodiment, where the application scenario is a residential district, and the residential district has three entrances and exits, where:
1) the northeast door is an entrance and an exit, and has two functions of an exit and an entrance, and the exit and the entrance of the northeast door are respectively provided with an exit device and an entrance device.
2) Siemens is an inlet, which is a very large inlet, and therefore two inlet devices are provided at this inlet.
3) The south gate is the outlet, and is a very large outlet similar to the west gate inlet, so two outlet devices are also provided at this outlet.
IN this application scenario, assume that vehicle a enters the residential community from northeast door entry IN 1. The entrance device IN1 recognizes the license plate number of the vehicle a, that is, the entrance license plate number, generates entrance license plate information and stores it IN its own database, and notifies all the exit devices (here, the exit device O1, the exit device O2.1, and the exit device O2.2) at the same time, and all the exit devices cache the entrance license plate information from the entrance device IN 1.
The vehicle A is ready to leave through a south door exit after stopping in a residential district for one day, when the vehicle A approaches the south door exit, the exit equipment O2.1 and O2.2 recognize the license plate number of the vehicle A, namely the exit license plate number, in a very short time, the exit equipment O2.1 and O2.2 carry out data synthesis to obtain a best recognition result, whether the exit license plate number records exist is inquired from the cache according to the recognition result, and if the exit license plate number records do not exist, the vehicle A goes to the entrance equipment for inquiry. If the sequential query is successful, the exit device O2.1 or O2.2 generates parking information according to the entrance license plate information and the departure time, and informs all the entrance devices and the exit devices of updating the entrance license plate information corresponding to the exit license plate number, so that all the devices know that the vehicle leaves the parking lot. The egress device O2.1 or O2.2 may push an identification result including vehicle entrance and exit information to the application layer. Therefore, the application software can obtain the result through the corresponding protocol SDK or OpenSDK to perform corresponding charging switching-off processing.
Of course, if the vehicle a enters from the siemens inlet, the best recognition result can be screened out and stored between the inlet devices IN3.1 and IN3.2 through information synthesis, and the inquiry of the outlet device is waited.
The invention also provides a parking lot management device based on the ad hoc network, which comprises a processor and a storage medium, wherein the storage medium stores a plurality of instructions, and the instructions are suitable for being loaded and executed by the processor to realize the steps of the parking lot management method of the embodiment.
The parking lot management device has the same technical features as the steps of the parking lot management method of the foregoing embodiment, and thus, will not be described herein again.
Through the mode, the parking lot management method and the parking lot management equipment based on the ad hoc network can identify license plate information and process business simultaneously by the inlet equipment or the outlet equipment through the outlet and inlet detection in various forms, and the independence of the system is very strong due to the flexible decentralization server; based on the information provided by networking, the method can greatly facilitate the service development of users. Meanwhile, complete service processing and complete decentralization can be achieved among the devices through information provided by networking.
In the prior art, service processing is performed on a single device, and result synthesis is performed on information synthesis between devices in the same group by using an upper computer (central software). The invention uses the networking technology, can regard the cameras in the same group as a unified camera, and the upper layer does not need to be connected with a plurality of cameras to comprehensively output results, and only needs to be used like a common camera.
In the absence of the host computer, the stand-alone device has no way to do effective business processing because the stand-alone device is unaware of the presence of the other cameras. After networking is used, independent cameras are combined together, business logic processing of a parking lot can be conveniently achieved in the cameras, centralization is completely achieved, real and complete unattended operation can be achieved, and meanwhile cost is greatly saved.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (6)
1. A parking lot management method based on an ad hoc network is characterized by comprising the following steps:
step S1: the entrance equipment of each entrance and the exit equipment of each exit of the parking lot are in communication connection through the same networking, the entrance equipment of the same entrance is grouped, and the exit equipment of the same exit is grouped;
the specific process of synchronous configuration comprises the following steps:
all the equipment continuously broadcasts the self serial number Sn and the self IP address;
establishing corresponding independent processing terminals based on all equipment of the parking lot network, and setting at least three layers of tree structures for equipment with different IP addresses and serial numbers by any processing terminal according to the type of an entrance and an exit of the parking lot;
when broadcasting is carried out after Vzid information configuration of a certain device is finished, other devices in the same local area network update the Vzid information of the device according to the local group list of the device, and synchronous configuration is finished;
step S2: the entrance equipment identifies the license plate of the entrance vehicle to obtain an entrance license plate number;
step S3: the entrance device inquires whether the same unused local license plate number exists, if the same unused local license plate number does not exist, the step S4 is executed, otherwise, the step S6 is executed, wherein the unused local license plate number is: a license plate number that is recognized by the inlet device and stored locally but not recognized by the outlet device;
step S4: the access device judges whether other access devices exist in the group, if so, the step S5 is executed; otherwise, executing step S8;
step S5: the entrance equipment inquires whether other entrance equipment has the same unused local license plate number, if so, the step S6 is executed, otherwise, the step S8 is executed;
step S6: the entrance equipment judges whether the confidence of the entrance license number is greater than the confidence of the local license number, if so, the step S7 is executed, otherwise, the step S8 is executed;
step S7: the entrance equipment updates entrance license plate information and broadcasts the entrance license plate information to all exit equipment, wherein the entrance license plate information comprises entrance license plate numbers and entrance time;
step S8: the entrance equipment generates entrance license plate information and stores the entrance license plate information locally;
step S9: the exit equipment identifies the license plate of the exit vehicle to obtain an exit license plate number;
step S10: the exit equipment searches whether the exit license number is recorded according to the received entrance license information, and if not, the step S11 is executed; otherwise, executing step S13;
step S11: the exit device inquires whether the entrance device stores the record of the exit license number, if not, the step S12 is executed; otherwise, go to step S13;
step S12: the exit device generates a piece of vehicle entry information using the default record;
step S13: and the exit equipment generates parking information according to the entrance license plate information and the departure time or according to the vehicle entrance information and the departure time, and informs all the entrance equipment and the exit equipment of updating the entrance license plate information corresponding to the exit license plate number.
2. The parking lot management method according to claim 1, wherein the step of updating the entrance license plate information by the entrance device specifically comprises:
and comparing the confidence degrees of the entrance license plate numbers by the entrance devices in the same group, updating the entrance license plate information by the entrance devices with higher confidence degrees, and discarding the entrance license plate information by the entrance devices with lower confidence degrees.
3. The parking lot management method according to claim 1, wherein in step S9: when a plurality of outlet devices in the same group exist at the same outlet and are on line at the same time, and the outlet devices in the same group identify outlet license numbers at the same time, the outlet devices in the same group compare the confidence degrees of the outlet license numbers, the outlet device with the maximum confidence degree retains the outlet license number, and the residual outlet devices discard the outlet license number;
and when the exit equipment in the same group is not on line, selecting one exit equipment to inquire whether the same license plate number exists in the local cache or not, and if the same license plate number does not exist, outputting a default value.
4. The parking lot management method according to any one of claims 1 to 3, wherein the entrance license plate information stored by the entrance device is mutually exclusive from the entrance license plate information stored by other entrance devices; the exit license plate numbers stored by the exit equipment and the exit license plate numbers stored by other exit equipment are mutually exclusive.
5. The parking lot management method according to claim 4, further comprising performing service data processing according to the parking information.
6. An ad-hoc network based parking lot management device, characterized in that the parking lot management device comprises a processor and a storage medium storing a plurality of instructions adapted to be loaded and executed by the processor to implement the steps of the parking lot management method according to any one of claims 1 to 5.
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| US20150371541A1 (en) * | 2014-06-23 | 2015-12-24 | Hi-Park Solutions Ltd. | Method and System for Locating Vacant Parking Places |
| CN105701900A (en) * | 2016-04-19 | 2016-06-22 | 王勇 | Method and system for parking place obligee to authorize access control passing identity carrier of other people |
| CN107067478A (en) * | 2017-03-29 | 2017-08-18 | 广州群安电子科技有限公司 | A kind of parking charging method and system |
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2018
- 2018-10-22 CN CN201811228834.2A patent/CN109360440B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150371541A1 (en) * | 2014-06-23 | 2015-12-24 | Hi-Park Solutions Ltd. | Method and System for Locating Vacant Parking Places |
| CN104392239A (en) * | 2014-09-25 | 2015-03-04 | 深圳市捷顺科技实业股份有限公司 | License plate identification method and system |
| CN105701900A (en) * | 2016-04-19 | 2016-06-22 | 王勇 | Method and system for parking place obligee to authorize access control passing identity carrier of other people |
| CN107067478A (en) * | 2017-03-29 | 2017-08-18 | 广州群安电子科技有限公司 | A kind of parking charging method and system |
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