CN109377767B - License plate recognition system of parking lot and control method - Google Patents
License plate recognition system of parking lot and control method Download PDFInfo
- Publication number
- CN109377767B CN109377767B CN201811495436.7A CN201811495436A CN109377767B CN 109377767 B CN109377767 B CN 109377767B CN 201811495436 A CN201811495436 A CN 201811495436A CN 109377767 B CN109377767 B CN 109377767B
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- license plate
- information
- plate recognition
- camera
- adjusting mechanism
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000006073 displacement reaction Methods 0.000 claims abstract description 60
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000004888 barrier function Effects 0.000 claims abstract description 14
- 230000010365 information processing Effects 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 8
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/043—Allowing translations
- F16M11/045—Allowing translations adapted to left-right translation movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/50—Context or environment of the image
- G06V20/52—Surveillance or monitoring of activities, e.g. for recognising suspicious objects
- G06V20/54—Surveillance or monitoring of activities, e.g. for recognising suspicious objects of traffic, e.g. cars on the road, trains or boats
-
- 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
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V2201/00—Indexing scheme relating to image or video recognition or understanding
- G06V2201/08—Detecting or categorising vehicles
Abstract
The invention discloses a license plate recognition system of a parking lot, which comprises an industrial personal computer, a vehicle detection device, a barrier gate and a license plate recognition device, wherein the license plate recognition device comprises a camera and a position adjusting part, the camera is arranged on the position adjusting part, the position adjusting part comprises a transverse adjusting mechanism and an angle adjusting mechanism, a linear displacement sensor for detecting the moving position of a ball screw pair is arranged on the transverse adjusting mechanism, an angle displacement sensor for detecting the rotating angle of a rotating cylinder or a rotating shaft is arranged on the angle adjusting mechanism, and the linear displacement sensor and the angle displacement sensor are respectively connected with an industrial personal computer. The invention also discloses a control method of the license plate recognition system of the parking lot. Compared with the prior art, after long-term repeated statistics, the method can obtain the position information of the camera, such as optimization, suboptimal optimization and the like, and the position of the camera is quickly adjusted through the position information, so that the clear shooting efficiency of the camera is greatly improved.
Description
Technical Field
The invention relates to a parking lot license plate recognition system and a control method, and belongs to the field of parking lot license plate recognition.
Background
With the development of social economy, the maintenance amount of urban motor vehicles is rapidly increased, so that the demand of residential parking lots and public parking lots is greatly increased. In an open parking lot or an entrance of an underground parking lot, a license plate recognition system is generally arranged, and after the license plate recognition system recognizes a license plate, a railing is controlled to be opened to let a motor vehicle go in. In the process, the license plate recognition technology is very important, and the license plate recognition technology is adopted, so that the captured image is analyzed through software to find out the license plate number and is extracted to be used as the identification code of the vehicle, and management activities such as illegal capturing and parking charging are performed. However, since motor vehicles have various hanging positions (e.g. heights) of license plates, and meanwhile, the driving information of each vehicle at the entrance and exit of the parking lot is different (e.g. the driving deviates from the position of the main road), and the position of the camera at the entrance and exit of the parking lot is generally fixed, so that the camera is inconvenient to adjust, therefore, the license plate number cannot be well identified due to the angle problem in photographing different vehicles, and the entrance and exit efficiency of the vehicles can be affected.
Disclosure of Invention
In view of the problems in the background art, an object of the present invention is to: the license plate recognition system and the control method for the parking lot can automatically adjust the shooting position of the camera so as to quickly and clearly shoot license plate numbers of different vehicles and improve the passing efficiency of the vehicles.
The technical scheme of the invention is as follows: the car license plate recognition system comprises an industrial personal computer, a car detection device, a barrier gate and a license plate recognition device, wherein the industrial personal computer is respectively and electrically connected with the car detection device, the barrier gate and the car recognition device, the car detection device and the barrier gate are both arranged on an entrance lane of the car park, the license plate recognition device is arranged on one side edge of the barrier gate or the entrance lane,
the license plate recognition device comprises a camera and a position adjusting part, wherein the camera is arranged on the position adjusting part, and the position adjusting part comprises a transverse adjusting mechanism and an angle adjusting mechanism; wherein,
the transverse adjusting mechanism comprises a driving motor, a ball screw pair and two sliding rails, wherein the driving motor is electrically connected with the industrial personal computer, a motor shaft of the driving motor is connected with the ball screw, the sliding rails are correspondingly arranged on two sides of the ball screw respectively, the ball screw pair is sleeved on the ball screw and the sliding rails, and the driving motor drives the ball screw to rotate positively and negatively so that the ball screw pair moves back and forth on the ball screw;
the angle adjusting mechanism is arranged on the ball screw pair, the angle adjusting mechanism is arranged as a rotary cylinder or a rotary motor driving rotating shaft structure, the rotary cylinder or the rotary motor is electrically connected with the industrial personal computer, and the camera is arranged on the rotary cylinder or the rotating shaft to adjust the pitching angle of the camera;
the device is characterized in that a linear displacement sensor for detecting the moving position of the ball screw pair is arranged on the transverse adjusting mechanism, an angle displacement sensor for detecting the rotating angle of the rotating cylinder or the rotating shaft is arranged on the angle adjusting mechanism, and the linear displacement sensor and the angle displacement sensor are respectively connected with the industrial personal computer through an electric motor.
The license plate recognition device comprises a license plate recognition box, and the camera and the position adjusting part are arranged in an opening groove at the upper part of the license plate recognition box.
And a light supplementing lamp for assisting the camera to work is arranged on the license plate recognition box.
The industrial personal computer is arranged in a monitoring room at the entrance and the exit of the parking lot or in the license plate recognition box.
The industrial personal computer comprises an information acquisition unit, an information processing unit, an information storage unit and a main control unit, wherein the information acquisition unit receives identification information of the vehicle detection device, the linear displacement sensor and the angle displacement sensor, transmits acquired data information to the information processing unit, and the information processing unit analyzes and processes acquired data to realize that license plate information, camera linear displacement information and pitching angle displacement information are stored in the information storage unit and feed back processing information to the main control unit, and the main control unit controls the operation of the barrier gate, the transverse adjusting mechanism and the angle adjusting mechanism.
The invention also provides a control method of the parking lot license plate recognition system, which comprises the following steps:
(1) The method comprises the steps of collecting position information of clear photographing of a camera when different vehicles enter and exit a parking lot, including linear displacement information and pitching angle displacement information, and sending the information to an information storage unit of an industrial personal computer;
(2) The information processing unit of the industrial personal computer counts different position information in real time, arranges the position information according to the occurrence times from more to less, and stores the processing result in the information storage unit;
(3) When a vehicle enters and exits the parking lot, the main control unit sequentially adjusts the transverse adjusting mechanism and the angle adjusting mechanism according to the probability of the occurrence of the position information in the information storage unit from more to less until license plate information can be clearly acquired.
The linear displacement information and the angular displacement information of the camera are divided into a plurality of sections, the linear displacement sections and the angular displacement sections which enter different vehicles when the vehicles are photographed clearly are counted, the linear displacement sections and the angular displacement sections are arranged according to the probability, and the processing structure is stored in the information storage unit.
The beneficial effects of the invention are as follows: according to the invention, the position adjusting part can be used for adjusting the transverse position and the pitching angle shot by the camera, so that the recognition capability of the camera on the license plate of the vehicle entering and exiting can be improved, and the passing efficiency of the vehicle can be improved. In particular, according to the control method, the position information of the camera, namely the transverse displacement information and the pitching angle information of the camera, which are clearly photographed by the camera when different vehicles enter and exit the parking lot, are collected and counted, and the main control unit sequentially adjusts the transverse adjusting mechanism and the angle adjusting mechanism from large to small according to the probability of the position information until the camera can clearly collect license plate information. Compared with the prior art, after long-term repeated statistics, the method can obtain the position information of the camera, such as optimization, suboptimal optimization and the like, and the position of the camera is quickly adjusted through the position information, so that the clear shooting efficiency of the camera is greatly improved.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic diagram of the structure of the present invention;
FIG. 3 is a schematic view of a position adjusting portion of the present invention;
reference numerals illustrate: the vehicle license plate recognition device comprises a license plate recognition box 1, a camera 2, a driving motor 3, a ball screw 4, a ball screw pair 5, an angle adjusting mechanism 6, a light supplementing lamp 7, an angle displacement sensor 8, a sliding rail 9 and a linear displacement sensor 10.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific examples:
referring to fig. 1 to 3, a license plate recognition system of a parking lot comprises an industrial personal computer, a vehicle detection device, a barrier gate and a license plate recognition device, wherein the industrial personal computer is electrically connected with the vehicle detection device, the barrier gate and the vehicle recognition device respectively, the vehicle detection device and the barrier gate are both arranged on an entrance lane of the parking lot, and the license plate recognition device is arranged on one side edge of the barrier gate or the entrance lane. The industrial personal computer is used for controlling the working conditions of the vehicle detection device, the barrier gate and the license plate recognition device, the vehicle detection device is used for detecting the vehicle access information in real time and uploading the information to the industrial personal computer, the industrial personal computer is used for controlling the working conditions of all parts, the license plate recognition device is used for recognizing passing vehicles, and the recognized information is stored in the industrial personal computer so as to be convenient for checking when the vehicles access, and further the action of the barrier gate is controlled.
The license plate recognition device comprises a camera 2, a mounting seat and a position adjusting part, wherein the camera 2 is arranged on the position adjusting part through the mounting seat, the position adjusting part is used for adjusting the transverse position and the pitching angle position of the camera 2, and the position adjusting part comprises a transverse adjusting mechanism and an angle adjusting mechanism 6. Preferably, the transverse adjusting mechanism comprises a driving motor 3, a ball screw 4, a ball screw pair 5 and two sliding rails 9, wherein the driving motor 3 is electrically connected with an industrial personal computer, the operation of the transverse adjusting mechanism is controlled by the industrial personal computer, a motor shaft of the driving motor 3 is connected with the ball screw 4, two sliding rails 9 are correspondingly and respectively arranged at two sides of the ball screw 4 in parallel, the ball screw pair 5 is sleeved on the ball screw 4 and the sliding rails 9, the driving motor 3 drives the ball screw 4 to rotate positively and negatively, and the ball screw pair 5 moves reciprocally along the length direction of the ball screw 4 due to the limitation of the sliding rails 9. Preferably, the drive motor 3 is a stepper motor.
The angle adjusting mechanism 6 is arranged on the ball screw pair 5, or a mounting seat can be fixed on the ball screw pair 5, and then the angle adjusting mechanism 6 is arranged on the mounting seat. The angle adjusting mechanism 6 is arranged to be a rotary cylinder or a rotary motor driven rotating shaft structure, the rotary cylinder or the rotary motor is electrically connected with the industrial personal computer, the industrial personal computer controls the rotary cylinder or the rotary motor to rotate, and the camera 2 is arranged on the rotary cylinder or the rotating shaft, so that the pitching angle of the camera 2 can be adjusted through the rotary cylinder or the rotating shaft. Preferably, the rotary motor is a stepping motor.
Preferably, the license plate recognition device further comprises a license plate recognition box 1, an open slot is formed in the upper portion of the license plate recognition box 1, and the camera 2 and the position adjusting part are arranged in the open slot, so that rainwater can be prevented from affecting the normal operation of the camera 2. The license plate recognition box 1 is provided with a light supplementing lamp 7 for assisting the camera 2 to work so as to improve the recognition efficiency of the camera 2, especially when the light is bad or at night. Preferably, the industrial personal computer may be disposed in a parking lot entrance monitoring room or mounted in the license plate recognition box 1.
The transverse adjusting mechanism is provided with a linear displacement sensor 10 for detecting the moving position of the ball screw pair 5, specifically, a sliding sheet of the sensor is arranged on the ball screw pair 5, and a fixed part of the sensor is arranged on the sliding rail 9, so that the displacement of the sliding sheet on the sliding rail 9 can be measured. An angle displacement sensor 8 for detecting the rotation angle of the rotary cylinder or the rotary shaft is arranged on the angle adjusting mechanism 6 so as to realize the measurement of the rotation angle of the rotary cylinder or the rotary motor. The linear displacement sensor 10 and the angular displacement sensor 8 are respectively electrically connected with the industrial personal computer to transmit the detected linear displacement and angular displacement to the industrial personal computer.
The industrial personal computer comprises an information acquisition unit, an information processing unit, an information storage unit and a main control unit, wherein the information acquisition unit receives identification information of the vehicle detection device, the camera 2, the linear displacement sensor 10 and the angle displacement sensor 8, transmits acquired data information to the information processing unit, and the information processing unit analyzes and processes the acquired data to realize the storage of license plate information, the linear displacement information of the camera 2 and pitching angle displacement information in the information storage unit and feed back processing information to the main control unit, and the main control unit controls the work of the barrier gate, the transverse adjusting mechanism and the angle adjusting mechanism 6.
The control method of the license plate recognition system of the parking lot comprises the following steps:
(1) The method comprises the steps that position information of clear photographing of a camera 2 when different vehicles enter and exit a parking lot is collected, the position information comprises linear displacement information and pitching angle displacement information, and the information is sent to an information storage unit of an industrial personal computer for storage;
(2) The information processing unit of the industrial personal computer counts different position information in real time, arranges the position information according to the occurrence times from more to less, and stores the processing result in the information storage unit;
(3) When a vehicle enters and exits the parking lot, the main control unit sequentially adjusts the transverse adjusting mechanism and the angle adjusting mechanism 6 according to the probability of occurrence of the position information in the information storage unit and the position information from more to less until the camera 2 can clearly acquire license plate information.
The above-mentioned position information is not classified roughly, and a large amount of statistics are needed for realizing more accurate adjustment, but there is still a problem that the adjustment speed is slow. For this purpose, the linear displacement information and the angular displacement information of the camera 2 can be divided into several segments, for example, the linear displacement information is divided into 1,2,3, N sections, each section has its displacement value range, divide the angle displacement information into 1,2,3, M sections from a certain position of the rotating shaft to its tail end, each section has its angle displacement value range. When the linear displacement section and the angular displacement section which are entered when different vehicles are counted and photographed clearly, information points such as (1, 2), (2, 3), (1, 4) and the like can appear, the probability of each information point is counted, the probability is arranged according to the probability, a processing structure is stored in an information storage unit, and when the vehicles enter and exit a parking lot, the transverse adjusting mechanism and the angle adjusting mechanism 6 are sequentially adjusted according to more information points to less information points until the camera 2 can clearly acquire license plate information.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (6)
1. The utility model provides a control method of parking area license plate recognition system, the system includes industrial computer, vehicle detection device, banister and license plate recognition device, the industrial computer electric connection respectively vehicle detection device, banister and vehicle recognition device, vehicle detection device with the banister all sets up in parking area access & exit lane, and license plate recognition device set up in banister or access & exit lane one side edge, its characterized in that:
the license plate recognition device comprises a camera (2) and a position adjusting part, wherein the camera (2) is arranged on the position adjusting part, and the position adjusting part comprises a transverse adjusting mechanism and an angle adjusting mechanism (6); wherein,
the transverse adjusting mechanism comprises a driving motor (3), a ball screw pair (5) and two sliding rails (9), wherein the driving motor (3) is electrically connected with the industrial personal computer, a motor shaft of the driving motor (3) is connected with the ball screw (4), the sliding rails (9) are correspondingly arranged on two sides of the ball screw (4) respectively, the ball screw pair (5) is sleeved on the ball screw (4) and the sliding rails (9), and the driving motor (3) drives the ball screw (4) to rotate positively and negatively so that the ball screw pair (5) moves back and forth on the ball screw (4);
the angle adjusting mechanism (6) is arranged on the ball screw pair (5), the angle adjusting mechanism (6) is arranged to be a rotary cylinder or a rotary motor driving rotating shaft structure, the rotary cylinder or the rotary motor is electrically connected with the industrial personal computer, and the camera (2) is arranged on the rotary cylinder or the rotating shaft to adjust the pitching angle of the camera (2);
the transverse adjusting mechanism is provided with a linear displacement sensor (10) for detecting the moving position of the ball screw pair (5), the angle adjusting mechanism (6) is provided with an angle displacement sensor (8) for detecting the rotating angle of the rotating cylinder or the rotating shaft, and the linear displacement sensor (10) and the angle displacement sensor (8) are respectively electrically connected with the industrial computer;
the control method of the license plate recognition system of the parking lot comprises the following steps:
(1) The method comprises the steps of collecting position information of clear photographing of a camera (2) when different vehicles enter and exit a parking lot, including linear displacement information and pitching angle displacement information, and sending the information to an information storage unit of an industrial personal computer;
(2) The information processing unit of the industrial personal computer counts different position information in real time, arranges the position information according to the occurrence times from more to less, and stores the processing result in the information storage unit;
(3) When a vehicle enters and exits the parking lot, the main control unit sequentially adjusts the transverse adjusting mechanism and the angle adjusting mechanism (6) according to the probability of occurrence of the position information in the information storage unit from more to less until the camera (2) can clearly acquire license plate information.
2. The control method of a license plate recognition system for a parking lot according to claim 1, characterized by: the license plate recognition device comprises a license plate recognition box (1), and the camera (2) and the position adjusting part are arranged in an open slot at the upper part of the license plate recognition box (1).
3. The control method of the license plate recognition system of the parking lot according to claim 2, characterized in that: the license plate recognition box (1) is provided with a light supplementing lamp (7) for assisting the camera (2) to work.
4. The control method of the license plate recognition system of the parking lot according to claim 2, characterized in that: the industrial personal computer is arranged in a parking lot entrance monitoring room or the license plate recognition box (1).
5. The method for controlling a license plate recognition system of a parking lot according to claim 4, wherein: the industrial personal computer comprises an information acquisition unit, an information processing unit, an information storage unit and a main control unit, wherein the information acquisition unit receives identification information of the vehicle detection device, the linear displacement sensor (10) and the angle displacement sensor (8), the acquired data information is transmitted to the information processing unit, the information processing unit analyzes and processes the acquired data, license plate information, linear displacement information of the camera (2) and pitching angle displacement information are stored in the information storage unit, the processed information is fed back to the main control unit, and the main control unit controls the operation of the barrier gate, the transverse adjusting mechanism and the angle adjusting mechanism (6).
6. The control method of a license plate recognition system for a parking lot according to claim 1, characterized by: the linear displacement information and the angular displacement information of the camera (2) are divided into a plurality of sections, the linear displacement sections and the angular displacement sections which enter different vehicles when the vehicles are photographed clearly are counted, the linear displacement sections and the angular displacement sections are arranged according to the probability, and the processing structure is stored in the information storage unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811495436.7A CN109377767B (en) | 2018-12-07 | 2018-12-07 | License plate recognition system of parking lot and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811495436.7A CN109377767B (en) | 2018-12-07 | 2018-12-07 | License plate recognition system of parking lot and control method |
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| Publication Number | Publication Date |
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| CN109377767A CN109377767A (en) | 2019-02-22 |
| CN109377767B true CN109377767B (en) | 2023-12-26 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110335501B (en) * | 2019-08-13 | 2022-11-29 | 深圳市速亿通科技有限公司 | Property management parking system based on Internet of things |
| CN113674531A (en) * | 2021-08-21 | 2021-11-19 | 深圳市睿泰科技术有限公司 | License plate recognition all-in-one machine and accurate recognition method |
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