CN108765970B - Method and device for automatically identifying license plate of automobile during roadside parking - Google Patents
Method and device for automatically identifying license plate of automobile during roadside parking Download PDFInfo
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- CN108765970B CN108765970B CN201810893154.6A CN201810893154A CN108765970B CN 108765970 B CN108765970 B CN 108765970B CN 201810893154 A CN201810893154 A CN 201810893154A CN 108765970 B CN108765970 B CN 108765970B
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
- G08G1/0175—Detecting movement of traffic to be counted or controlled identifying vehicles by photographing vehicles, e.g. when violating traffic rules
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/20—Scenes; Scene-specific elements in augmented reality scenes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/60—Type of objects
- G06V20/62—Text, e.g. of license plates, overlay texts or captions on TV images
- G06V20/625—License plates
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Abstract
The invention discloses a method and a device for automatically identifying a license plate of an automobile during roadside parking, wherein the method comprises the steps of detecting the distance between the automobile and an equipment end, and judging whether the automobile enters a warehouse or leaves the warehouse; capturing license plate information pictures for multiple times, and encrypting; it is right license plate information picture carries out license plate discernment, realizes the discernment to the license plate, and separately sets up license plate camera device and recognition device, takes a candid photograph many license plate information images, and backend server discerns license plate information image, and monitors the distance of vehicle and equipment end through the sensor, combines together with license plate discernment for can take a candid photograph the vehicle information picture of different parking status, carry out discernment many times, improve license plate discernment's rate of accuracy greatly, carry out analysis and result output to many images simultaneously fast.
Description
Technical Field
The invention relates to the technical field of license plate recognition, in particular to a method and a device for automatically recognizing a license plate of an automobile during roadside parking.
Background
In recent years, with the acceleration of urbanization, the consumption level of residents is improved, and the popularity of the number of urban automobiles is greatly increased. The number of the matched parking lots is slowly increased. The roadside parking field is used as a necessary supplement of a parking mode and is continuously enlarged in scale in order to practically solve parking pressure, but phenomena of roadside parking stall disorder, operation disorder, charge disorder, order disorder, supervision disorder and the like are prominent to a certain extent due to the fact that the difference between the quantity of motor vehicles kept and the supply of parking stalls is increased year by year, and the traditional manual management traffic cannot adapt to the change, so that the intelligent traffic system is widely applied to urban traffic management and dispatching China. The license plate recognition is the core of the intelligent traffic system.
License plate identification is an important component in modern intelligent traffic systems, is widely applied, and is based on technologies such as mode identification, computer vision, digital image processing and the like. The functions of traffic flow control index measurement, vehicle positioning, traffic violation snapshot, parking charge management and the like can be realized through a series of processing of license plate data, and currently, license plate identification is realized by acquiring images of vehicles entering and exiting a parking lot through a license plate identification camera, calling a license plate identification algorithm to perform real-time analysis processing on the image information so as to identify license plates, sending the identified license plates to a convergence switch through the switch, and then sending the license plates to a parking lot server through the convergence switch, but the license plate identification camera can only snapshot the images of the vehicles through a triggering mode, analyzes the license plate information through a single image, cannot simultaneously and rapidly analyze and output a plurality of images, so that the license plate identification accuracy is low, and errors exist; in addition, due to the limitation of the structure of the license plate recognition camera all-in-one machine, the internal storage space of hardware and a main control chip cannot be greatly expanded, and a more complex and higher-level deep learning frame cannot be arranged in the license plate recognition camera due to the reasons, so that the video information of vehicles entering and exiting the parking lot cannot be subjected to deep structural analysis, and the license plate number recognition accuracy of the existing license plate recognition camera is greatly upgraded to 100%.
Disclosure of Invention
Aiming at the defects in the technology, the invention provides a method and a device for automatically identifying the license plate of an automobile during roadside parking, which separate a license plate camera from identification, capture a plurality of license plate information pictures of the automobile in an unused state, and then identify the license plate information pictures, thereby greatly improving the accuracy of license plate identification.
In order to achieve the above object, the present invention provides a method for automatically identifying a license plate of a vehicle during roadside parking, which comprises:
detecting the distance between the vehicle and the equipment end, and judging the vehicle to enter and exit;
capturing license plate information pictures for multiple times, and encrypting;
and identifying the license plate of the license plate information picture.
In the step of detecting the distance between the vehicle and the equipment end and judging the vehicle entering and leaving, the distance between the vehicle and the equipment end is detected, and the method for judging the vehicle entering comprises the following steps:
judging whether the object is a valid vehicle;
when the object is an effective vehicle, continuously acquiring the parking space state of the effective vehicle;
judging whether the valid vehicle enters a valid range according to the parking state of the valid vehicle;
and when the effective vehicle enters an effective range, capturing the license plate information picture.
When the object is judged not to be an effective vehicle, detecting the parking space state of the object in real time; and when the state of the parking space is kept unchanged, activating an alarm device to give an alarm to remind the owner of the object to remove the object.
Wherein, in the license plate information picture of taking a candid photograph many times, and carry out the step of encryption processing, when the vehicle enters the parking stall for the side, this step is: in the process of repeatedly moving forwards and backing a car, pictures of the car at different distances from the equipment end are captured, and when the front and back states of the parking space of the car are unchanged, the shooting is finished; and sequencing the images of the license plate according to the sequence from the last to the earliest, and encrypting.
In the step of detecting the distance between the vehicle and the equipment end and judging the vehicle to enter and exit, the distance between the vehicle and the equipment end is detected, and the method for judging the vehicle to exit comprises the following steps: and when the parking space state of the vehicle is detected to be that the distance between the current parking space state and the equipment end is larger than the distance between the previous parking space state and the equipment end, determining that the vehicle is going out of the garage, simultaneously carrying out series snapshot on the license plate information pictures, and carrying out encryption processing.
In the step of recognizing the license plate of the license plate information picture, when a vehicle enters a garage, the method for recognizing the license plate information picture comprises the following steps:
acquiring encrypted vehicle image information, firstly identifying two pieces of vehicle image information which are sequenced in the front, if the identification is successful, storing the license plate number and the image, and storing the current parking starting time;
if the identification is unsuccessful, continuing to identify the image information of the two subsequent vehicles, and when the license plate identification is successful, storing the license plate number and the image and storing the current parking starting time;
when the license plate is not recognized successfully, the image information of the following vehicle is continuously recognized; and storing the license plate number and the image until the license plate is successfully identified, and storing the current parking starting time.
In the method for recognizing the license plate information picture when a vehicle enters a garage, a manual recognition link is entered when the license plate is not finally recognized.
After the step of identifying the license plate of the license plate information picture, the method further comprises a comparison step: and comparing the license plate information picture of the vehicle leaving the garage with the vehicle information picture of the vehicle entering the garage, and determining the parking time of the vehicle for charging the vehicle.
The invention also provides a device for automatically identifying the license plate of the automobile during roadside parking, which comprises an equipment end, a background server and a mobile terminal, wherein the equipment end, the background server and the mobile terminal are mutually wirelessly connected in a wireless communication mode, and the device specifically comprises the following components: a sensor at the equipment end detects the distance between the vehicle and the equipment end and judges whether the vehicle enters or leaves the warehouse; the camera device of the equipment side captures license plate information pictures for multiple times and encrypts the license plate information pictures; and the background server identifies the license plate of the license plate information picture.
The device comprises a sensor at the equipment end, a vehicle and a vehicle storage and delivery judging device, wherein the sensor at the equipment end detects the distance between the vehicle and the equipment end, and the vehicle storage and delivery judging process is as follows:
the microprocessor of the equipment end judges whether the object is a valid vehicle;
when the object is an effective vehicle, a sensor at the equipment end continuously acquires the parking space state of the effective vehicle;
the microprocessor judges whether the effective vehicle enters an effective range according to the parking state of the effective vehicle;
when the effective vehicle enters the effective range, the camera device captures the license plate information picture.
When the microprocessor judges that the object is not an effective vehicle, the sensor detects the parking space state of the object in real time; when the parking state is kept unchanged, the alarm device at the equipment end gives an alarm to remind the object owner to remove the object.
Wherein, snap the license plate information picture many times at camera device to carry out the in-process of encryption processing, the vehicle is for the side to get into the parking stall, and this step is: in the process of repeatedly moving forwards and backing a car, pictures of the car at different distances from the equipment end are captured, and when the front and back states of the parking space of the car are unchanged, the shooting is finished; and sequencing the images of the license plate according to the sequence from the last to the earliest, and encrypting.
In the processes of detecting the vehicle distance and judging the vehicle entering and leaving, the sensor detects the vehicle distance, and the method for judging the vehicle leaving comprises the following steps: and when the microprocessor judges that the parking space state of the vehicle detected by the sensor is that the distance between the current parking space state and the equipment end is greater than the distance between the previous parking space state and the equipment end, determining that the vehicle is going out of the garage, simultaneously carrying out serial snapshot on the license plate information pictures, and carrying out encryption processing.
In the process that the background server identifies the license plate of the license plate information picture, when a vehicle enters a garage, the specific device of the background server for identifying the license plate information picture is as follows:
the acquisition module is used for acquiring the encrypted vehicle picture information;
the identification module is used for identifying the encrypted vehicle image information, and specifically comprises the following steps: firstly, identifying the image information of two vehicles which are sequenced in the front, if the identification is successful, storing the license plate number and the image, and storing the current time as the parking starting time;
if the recognition is unsuccessful, continuing to recognize the image information of the two vehicles behind, and when the license plate recognition is successful, storing the license plate number and the image, and storing the current time as the parking starting time;
when the license plate is not recognized successfully, the image information of the following vehicle is continuously recognized; and storing the license plate number and the image until the license plate is successfully identified, and storing the current time as the parking starting time.
The background server further comprises a manual identification module, wherein the manual identification module is used in a method for identifying the license plate information picture when a vehicle enters a garage, and enters a manual identification link when the license plate is not identified finally.
The system further comprises a comparison module, wherein the comparison module is used for comparing the license plate information picture of the vehicle which is out of the garage with the vehicle information picture of the vehicle which is in the garage after the license plate identification process is carried out on the license plate information picture, and determining the parking time of the vehicle, and the comparison module is used for charging the vehicle.
The invention has the beneficial effects that: compared with the prior art, the method and the device for automatically identifying the license plate of the automobile during roadside parking, provided by the invention, have the advantages that the license plate camera device and the identification device are separately arranged, the image information of a plurality of license plates is captured, the image information of the license plates is identified in the background, the distance between the automobile and the equipment end is monitored through the sensor, and the distance is combined with the license plate identification, so that the image information of the automobile in different parking states can be captured, the repeated identification can be carried out, the accuracy rate of the license plate identification is greatly improved, and the analysis and the result output of the plurality of images can be rapidly carried out.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a diagram of the method of the present invention illustrating specific steps of vehicle warehousing;
FIG. 3 is a flow chart of the reversing garage of the present invention;
FIG. 4 is an overall method flow diagram of the present invention;
FIG. 5 is a system configuration diagram of the apparatus of the present invention.
Detailed Description
In order to make the present invention more clear and complete, the following description of the present invention with reference to the attached drawings is provided for illustrative purposes only and does not represent that the scope of the present invention is limited only by the embodiments of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without any inventive work are within the scope of the present invention.
Referring to fig. 1 and 2, the method for automatically identifying a license plate of a vehicle during roadside parking according to the present invention includes the following steps:
s1, detecting the distance between the vehicle and the equipment end 1, and judging the vehicle to enter and exit;
the equipment end 1 is installed in the position on parking stall, and is concrete, when the parking stall is the side parking way, generally sets up the parking stall along road curb, installs the equipment end in the side the place ahead on parking stall, because the scope that general sensor can detect is limited, can guarantee like this that the sensor of equipment end can detect the distance of vehicle and equipment end, judges that the vehicle warehouse entry or warehouse exit.
S2, capturing license plate information pictures for many times and encrypting; in the embodiment, the parking mode of the side parking road and the parking space comprises a side reverse parking space mode and a side forward parking space mode, so that license plate information pictures need to be captured from different positions according to the actual situation, the license plate information pictures cannot be captured at absolutely determined time points, encryption processing is performed, the condition that required license plate information is not captured by a single license plate information picture is avoided, the identification of S3 is made to provide a basis, and the identification accuracy is improved.
And S3, carrying out license plate recognition on the license plate information picture.
In this embodiment, the license plate information picture is subjected to license plate recognition, and since the license plate picture information of the vehicle in different parking states is captured in S2, the recognition accuracy is ensured.
In this embodiment, in step S1, the method for detecting the distance between the vehicle and the equipment and determining that the vehicle is parked includes the following steps:
s111, judging whether the object is a valid vehicle;
because there is the phenomenon of deliberately occupying the lane with tricycle, bicycle, when detecting the object, need carry out basic judgement to it earlier, specifically, can carry out different judgments according to the type of sensor, for example when the sensor is the radar, can judge according to the obstacle area that the radar reflects back, when the sensor is infrared ray sensor, then can judge according to the irradiation range of infrared ray, can decide according to actual conditions, carry out preliminary discernment judgement to the object earlier through the sensor.
S112, when the object is an effective vehicle, continuously acquiring the parking space state of the effective vehicle;
since the sensor 13 of the equipment terminal 1 is continuously operated, the parking space state of the valid vehicle can be monitored in real time.
The parking space state refers to a distance between the vehicle and the equipment side, that is, a situation of the vehicle in the parking space, and includes the following parking space states.
S113, judging whether the valid vehicle enters a valid range according to the parking state of the valid vehicle;
s114: and when the effective vehicle enters an effective range, capturing the license plate information picture.
Since the roadside parking space is arranged on the roadside and the range which can be detected by the sensor 13 is large, vehicles can avoid each other in the road driving process, this is because the sensor 13 can detect the vehicle being avoided, and can misjudge the vehicle as the vehicle to be parked and put in storage, at this time, a valid range is set, can effectively avoid misjudgment, when the effective vehicle is determined to enter the effective range, the license plate picture information is captured, the accuracy rate can be improved, the work is avoided, the effective range can be determined according to the actual situation and needs according to the type of the parking space, for example, the parking spaces of a large truck, a small truck or a small car are different in size, the corresponding effective ranges are also different, the corresponding effective ranges can be set for the corresponding parking spaces, in the present embodiment, a car is taken as an example, and the effective range is 1.5 m to 2.5 m.
In the step S111, when it is determined that the object is a valid vehicle, steps S112 to S114 are performed, and when it is determined that the object is not a valid vehicle, the following step S115 is performed: detecting the state of the parking space of the object in real time; and step S116, when the parking space state is kept unchanged, activating the alarm device 14 to give an alarm to remind the object owner to remove the object.
Taking the roadside car parking space occupied by the tricycle as an example, detecting that the object is not a car, judging the object as an obstacle, at the moment, continuously detecting the parking space state of the object, if the parking space state of the tricycle is guaranteed to be unchanged in 1-15 minutes, informing an alarm device, giving an alarm, and giving a light in an alarm mode, wherein the alarm mode can be a sound or a flashing light to remind the owner of the tricycle to remove the car, so that the existing regulation parking behavior is effectively avoided, certainly, some car owners may have a lucky mind.
In this embodiment, in step S2, since the parking mode of the roadside parking space is the side parking mode, and the side parking mode has two parking modes, i.e., the side-reverse parking space mode and the side-forward parking space mode, different processing modes are required when capturing the vehicle information picture, specifically, when the vehicle enters the parking space for side reverse and S22 when the vehicle enters the parking space for side forward, where S21 is: in the process of repeatedly advancing and backing, when the vehicle backs to be parallel to the roadside, capturing pictures of different distances between the vehicle and the equipment end, and finishing the capturing when the front and back states of a parking space of the vehicle are unchanged; and sequencing the images of the license plate according to the sequence from the last to the earliest, and encrypting.
When a vehicle backs into a parking space on the side, the vehicle tail firstly tilts towards the vehicle tail and firstly enters into the parking space, the vehicle backs into the rear part of the parking space after entering into the parking space, and then the vehicle backs into the proper position of the parking space through repeated forward and backward movement, and the equipment is arranged in the front, so that the license plate can not be photographed after the vehicle is detected to enter into the parking space, the side surface of the vehicle can only be photographed, and the license plate can only be photographed when the vehicle backs into a certain position and is parallel to the roadside, therefore, correspondingly, in the process of repeatedly forwarding and reversing, when the vehicle backs into the parking space and is parallel to the roadside, pictures of the vehicle at different distances from the equipment end are captured, so that effective license plate information pictures can be captured, for example, in the process of adjusting the vehicle to the parking space each time when the vehicle advances forward and reverses, the license plate is photographed at the farthest and closest position from the equipment, at this time, obviously, the probability that the vehicle information pictures captured farther back are better in integrity is better, so that the captured vehicle information pictures are sorted in the order from the last to the earliest capture and are encrypted, and the recognition in the step S4 is facilitated; because the vehicle is at the side in-process that moves ahead into the parking stall, the car from far away to nearly entering parking stall, the locomotive is getting into the parking stall at an angle earlier, get into the front portion of advancing to the parking stall behind the parking stall, then through going ahead repeatedly and backing a car and stopping in the suitable position in parking stall, because equipment fixing is in front, so detect the vehicle and get into behind the parking stall, just can shoot the license plate, shoot the license plate at a plurality of suitable distances according to the position of vehicle and equipment at the vehicle in-process that goes ahead, therefore S22 is: in the process of repeatedly moving forwards and backing a car, pictures of the car at different distances from the equipment end are captured, and when the front and back states of the parking space of the car are unchanged, the shooting is finished; and sequencing the images of the license plate according to the sequence from the last to the earliest, and encrypting.
For example, during each forward and backward movement of the vehicle to adjust the vehicle to be in the parking space, a vehicle information picture can be captured at the position where the vehicle is farthest from and closest to the device, and one vehicle information picture can be captured after the vehicle is stable.
In step S1, the method of detecting the distance between the vehicle and the device side and determining the vehicle leaving the garage includes: and when the parking space state of the vehicle is detected to be that the distance between the current parking space state and the equipment end is greater than the distance between the previous parking space state and the equipment end, determining that the vehicle is going out of the garage, and simultaneously capturing the license plate information picture.
When the vehicle is taken out of the garage, the method for capturing the vehicle information picture comprises the following steps: and in the process of vehicle delivery, capturing a series of vehicle information pictures and carrying out encryption processing.
Referring to fig. 3, in step S2, when a vehicle enters the garage, the method for recognizing the license plate information picture includes:
s231, acquiring encrypted vehicle image information, firstly identifying two pieces of vehicle image information which are sequenced in the front, if the identification is successful, storing the license plate number and the image, and storing the current parking starting time;
s232, if the recognition is unsuccessful, continuing to recognize the image information of the two subsequent vehicles, and when the license plate recognition is successful, storing the license plate number and the image and storing the current parking starting time;
s233, when the license plate is not recognized successfully, the image information of the following vehicle is continuously recognized; and storing the license plate number and the image until the license plate is successfully identified, and storing the current parking starting time.
In the method for recognizing the license plate information picture when a vehicle enters a garage, a manual recognition link is entered when the license plate is not finally recognized.
In this embodiment, referring to fig. 4, after step S3, the method further includes comparing step S4: and comparing the license plate information picture of the vehicle leaving the garage with the vehicle information picture of the vehicle entering the garage, and determining the parking time of the vehicle for charging the vehicle.
Referring to fig. 5, the invention also discloses a device for automatically identifying a license plate of a vehicle during roadside parking, which comprises an equipment end 1, a background server 2 and a mobile terminal 3, wherein the equipment end 1, the background server and the mobile terminal are wirelessly connected with each other in a wireless communication mode, specifically, when the parking space is a side parking road, the equipment end is generally arranged in front of the side of the parking space by arranging the parking space along road teeth, and the range which can be detected by a general sensor is limited, so that the sensor 13 of the equipment end 1 can detect the distance between the vehicle and the equipment end, and the vehicle can be judged to be stored in or taken out of the garage. The equipment end 1 comprises a camera device 14, a sensor 13, a microprocessor 12 and a wireless communication device, wherein the sensor 13 is used for detecting the distance between the vehicle and the equipment end and judging the vehicle entering and leaving; the camera device 14 is used for capturing license plate information pictures for multiple times, and the microprocessor 12 is used for encrypting the license plate information pictures; the background server 2 identifies the license plate of the license plate information picture, and the mobile terminal 1 is used for informing a user. Install camera device 14 at equipment end 1, carry out the snapshot of many times picture, convey background server 2 through wireless communication, discern for the equipment end need not occupy too much memory, and the snapshot is many vehicle information pictures discerned, makes the recognition effect better, and the accuracy is high.
In this embodiment, in the process of detecting the distance between the vehicle and the equipment end 1 by the sensor 13 and judging the vehicle entering and exiting, the two situations are divided into two situations, namely, the vehicle entering, the vehicle exiting, and when the vehicle entering is judged, the microprocessor 12 of the equipment end 1 judges whether the object is an effective vehicle; when the object is an effective vehicle, the sensor 13 of the equipment end 1 continuously acquires the parking space state of the effective vehicle; the microprocessor 12 judges whether the valid vehicle enters the valid range according to the parking state of the valid vehicle; when the microprocessor 12 judges that the valid vehicle enters the valid range, the camera 11 takes a snapshot of the license plate information picture, and when the microprocessor 12 judges that the object is not the valid vehicle, the sensor 13 detects the parking space state of the object in real time; when the parking state is kept unchanged, the alarm device 14 of the equipment end 1 gives an alarm to remind an object owner to remove the object, at the moment, if the alarm is given, the state of the parking space of the object is monitored and still does not change, at the moment, the condition is transmitted to a background server, law enforcement personnel are informed to process the condition.
The parking space is a road side parking space, the processes of entering the parking space by vehicles are two, namely side reversing and side front reversing, the parking space is detected in real time through the sensor 13, the real-time parking space state of the vehicles is captured by the corresponding control camera device 11 of the microprocessor 12, the specific details are described in the process of the method, and the equipment end 1 detects and captures vehicle information images through the sensor 13, the camera device 11 and the microprocessor 12 and transmits the images to the background server 2 for identification.
When the vehicle is taken out of the garage, the camera device 11 captures a series of vehicle picture information and encrypts the vehicle picture information through the microprocessor 12.
In this embodiment, the backend server 2 includes an obtaining module 21, an identifying module 22 and a storing module 23, where the obtaining module 21 is configured to obtain vehicle picture information from the device side 1; the identification module 22 is used for identifying the encrypted vehicle image information; the identification mode is as follows: the storage module 23 is configured to store the license plate information, the parking start time, and the parking departure time of the identified vehicle information pictures, and the identification process of the vehicle entering the garage includes: firstly, identifying the image information of two vehicles which are sequenced in the front, if the identification is successful, storing the license plate number and the image, and storing the current time as the parking starting time; if the recognition is unsuccessful, the two subsequent vehicle image information are continuously recognized, and when the license plate recognition is successful, the storage module 23 stores the license plate number and the image and the current time as the parking starting time; when the license plate is not recognized successfully, the image information of the following vehicle is continuously recognized; the storage module 23 stores the license plate number and the image until the license plate is successfully identified, and stores the current time as the parking starting time, wherein the parking system further comprises a manual identification module 25 (not shown), the manual identification module (not shown) is used in a method for identifying license plate information pictures when vehicles enter a warehouse, and the manual identification link is entered when the license plate is not identified finally.
Taking a car entering and warehousing and an ultrasonic sensor as an example:
at the moment, the ultrasonic detection range is 0.1-4.2 meters, after a car enters, the ultrasonic waves continuously send parking space states to the microprocessor, the microprocessor judges the parking space states at intervals of 10ms, when the car enters 0.5-2.5 meters, the car is considered to enter an effective range, the effective range is 0.5-2.5 meters, meanwhile, the microprocessor controls the camera to snapshot vehicle information pictures, and the snapshot mode is as follows: when the distance between the vehicle and the equipment end is 2.0-2.5 meters, 2 vehicle information pictures are taken by candid photograph and are numbered as A1/A2; 2 vehicle information pictures are taken at 1.5-2.0 m, and the serial number is A3/A4; 2 vehicle information pictures are taken at the distance of 1.0-1.5 m between the vehicle and the equipment end, and the serial number is A5/A6; 2 vehicle information pictures are taken at the distance of 0.5-1.0 m between the vehicle and the equipment end, and the serial number is A7/A8; the vehicle image information is sorted according to the sequence of A8-A7, encrypted and uploaded, or uploaded to a background server A7/A8 first, the identification modules A7 and A8 of the background server identify successfully, the identified license plate information, vehicle type and parking starting time are stored through a storage module, the identification is unsuccessful, the identification modules A5/A6 are uploaded to the background server, the identification modules A7 and A8 of the background server identify successfully, the identified license plate information, vehicle type and parking starting time are stored through the storage module, the identification is unsuccessful, the vehicle image information is uploaded to A3/A4 continuously, and the rest is done until the identification is successful; if the A1/A2 is recognized to be not successfully identified, the A1-A8 is sent to a manual identification module for manual identification.
The background server 2 further includes a comparison module 24, configured to compare the license plate information picture of the vehicle leaving the garage with the vehicle information image of the vehicle entering the garage after the license plate information picture is subjected to the license plate recognition process, determine the parking time of the vehicle, and charge the vehicle.
The invention has the advantages that: separately set up license plate camera device and recognition device, take a candid photograph many license plate image information, the backstage discerns license plate image information, and monitors the distance of vehicle and equipment end through the sensor, combines together with the license plate discernment for can take a candid photograph different parking state's vehicle picture information, discern many times, improve the rate of accuracy of license plate discernment greatly, carry out analysis and result output to many images simultaneously fast.
The above disclosure is only one or more specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (10)
1. A method for automatically identifying a license plate of a vehicle during roadside parking, which is characterized by comprising the following steps:
detecting the distance between the vehicle and the equipment end, and judging the vehicle to enter and exit;
capturing license plate information pictures for multiple times, and encrypting;
carrying out license plate identification on the license plate information picture;
in the step of capturing license plate information pictures for multiple times and carrying out encryption processing, when a vehicle enters a parking space from the side, the step is as follows: in the process of repeatedly moving forwards and backing a car, pictures of the car at different distances from the equipment end are captured, and when the front and back states of the parking space of the car are unchanged, the shooting is finished; sequencing the images of the license plate according to the sequence from the last to the earliest, and encrypting;
in the step of detecting the distance between the vehicle and the equipment end and judging the vehicle to enter and exit, the distance between the vehicle and the equipment end is detected, and the method for judging the vehicle to exit comprises the following steps: when the parking space state of the vehicle is detected to be that the distance between the current parking space state and the equipment end is larger than the distance between the previous parking space state and the equipment end, the vehicle is determined to be out of the garage, and meanwhile, serial snapshot is carried out on license plate information pictures and encryption processing is carried out;
in the step of identifying the license plate of the license plate information picture, when a vehicle enters a garage, the method for identifying the license plate information picture comprises the following steps:
acquiring encrypted vehicle image information, firstly identifying two pieces of vehicle image information which are sequenced in the front, if the identification is successful, storing the license plate number and the image, and storing the current parking starting time;
if the identification is unsuccessful, continuing to identify the image information of the two subsequent vehicles, and when the license plate identification is successful, storing the license plate number and the image and storing the current parking starting time;
when the license plate is not recognized successfully, the image information of the following vehicle is continuously recognized; and storing the license plate number and the image until the license plate is successfully identified, and storing the current parking starting time.
2. The method for automatically identifying the license plate of the automobile during roadside parking according to claim 1, wherein in the steps of detecting the distance between the vehicle and the equipment end and judging the vehicle entering and leaving, the method for detecting the distance between the vehicle and the equipment end and judging the vehicle entering comprises the following steps: judging whether the object is a valid vehicle; when the object is an effective vehicle, continuously acquiring the parking space state of the effective vehicle; judging whether the valid vehicle enters a valid range according to the parking state of the valid vehicle; and when the effective vehicle enters an effective range, capturing the license plate information picture.
3. The method for automatically identifying the license plate of the automobile for roadside parking according to claim 2, wherein when the object is judged not to be a valid vehicle, the parking space state of the object is detected in real time; and when the state of the parking space is kept unchanged, activating an alarm device to give an alarm to remind the owner of the object to remove the object.
4. The method for automatically identifying the license plate of the automobile during roadside parking according to claim 1, wherein in the method for identifying the license plate information picture when the automobile enters a garage, when the license plate is not finally identified, a manual identification link is entered.
5. The method for automatically identifying the license plate of the automobile for roadside parking according to claim 1, characterized by further comprising a comparison step after the step of performing license plate identification on the license plate information picture: and comparing the license plate information picture of the vehicle leaving the garage with the vehicle information picture of the vehicle entering the garage, and determining the parking time of the vehicle for charging the vehicle.
6. The utility model provides a device of roadside parking automatic identification car license plate which characterized in that, includes equipment end, backstage server and mobile terminal, and realizes wireless connection through wireless communication mode each other, specifically is: a sensor at the equipment end detects the distance between the vehicle and the equipment end and judges whether the vehicle enters or leaves the warehouse; the camera device of the equipment side captures license plate information pictures for multiple times and encrypts the license plate information pictures; the background server identifies the license plate of the license plate information picture;
in the process of capturing license plate information pictures for many times by the camera device and carrying out encryption processing, a vehicle enters a parking space for the side, and the steps are as follows: in the process of repeatedly moving forwards and backing a car, pictures of the car at different distances from the equipment end are captured, and when the front and back states of the parking space of the car are unchanged, the shooting is finished; sequencing the images of the license plate according to the sequence from the last to the earliest, and encrypting;
in the processes of detecting the vehicle distance and judging the vehicle entering and leaving, the sensor detects the vehicle distance, and the method for judging the vehicle leaving comprises the following steps: when the microprocessor judges that the parking space state of the vehicle detected by the sensor is that the distance between the current parking space state and the equipment end is larger than the distance between the previous parking space state and the equipment end, the microprocessor determines that the vehicle is going out of the garage, simultaneously carries out serial snapshot on the license plate information pictures and carries out encryption processing;
in the process that the background server identifies the license plate of the license plate information picture, when a vehicle enters a garage, the specific device of the background server for identifying the license plate information picture is as follows:
the acquisition module is used for acquiring the encrypted vehicle picture information;
the identification module is used for identifying the encrypted vehicle image information, and specifically comprises the following steps: firstly, identifying the image information of two vehicles which are sequenced in the front, if the identification is successful, storing the license plate number and the image, and storing the current time as the parking starting time;
if the recognition is unsuccessful, continuing to recognize the image information of the two vehicles behind, and when the license plate recognition is successful, storing the license plate number and the image, and storing the current time as the parking starting time;
when the license plate is not recognized successfully, the image information of the following vehicle is continuously recognized; and storing the license plate number and the image until the license plate is successfully identified, and storing the current time as the parking starting time.
7. The apparatus for automatically identifying license plates of automobiles during roadside parking according to claim 6, wherein the sensor at the equipment end detects the distance between the automobile and the equipment end and judges whether the automobile enters or leaves the garage, wherein the apparatus for detecting the distance between the automobile and judging whether the automobile enters the garage comprises: the microprocessor of the equipment end judges whether the object is a valid vehicle; when the object is an effective vehicle, a sensor at the equipment end continuously acquires the parking space state of the effective vehicle; the microprocessor judges whether the effective vehicle enters an effective range according to the parking state of the effective vehicle; when the effective vehicle enters the effective range, the camera device captures the license plate information picture.
8. The apparatus according to claim 7, wherein when the microprocessor judges that the object is not a valid vehicle, the sensor detects the parking space state of the object in real time; when the state of the parking space is kept unchanged, the alarm device at the equipment end gives an alarm to remind the owner of removing the object.
9. The apparatus of claim 6, wherein the background server further comprises a manual recognition module, the manual recognition module is used in a method for recognizing the license plate information picture when the vehicle enters the garage, and when the final license plate is not recognized, the manual recognition link is entered.
10. The apparatus of claim 6, further comprising a comparison module for comparing the license plate information picture of the vehicle leaving the garage with the vehicle information picture of the vehicle entering the garage after the license plate identification process of the license plate information picture, and determining the parking time of the vehicle for charging the vehicle.
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