KR101797696B1 - System and method for recognizing license plate based on smart phone - Google Patents

System and method for recognizing license plate based on smart phone Download PDF

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Publication number
KR101797696B1
KR101797696B1 KR1020150186575A KR20150186575A KR101797696B1 KR 101797696 B1 KR101797696 B1 KR 101797696B1 KR 1020150186575 A KR1020150186575 A KR 1020150186575A KR 20150186575 A KR20150186575 A KR 20150186575A KR 101797696 B1 KR101797696 B1 KR 101797696B1
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South Korea
Prior art keywords
smartphone
vehicle
license plate
image
photographed
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KR1020150186575A
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Korean (ko)
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KR20170076387A (en
Inventor
정재훈
이철훈
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성남도시개발공사
정재훈
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Priority to KR1020150186575A priority Critical patent/KR101797696B1/en
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    • G06K9/32—
    • G06K9/3258—
    • 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
    • G06K2209/15—

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  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)

Abstract

A smartphone-based license plate recognition system and method are disclosed. A smartphone-based license plate recognition system for a smart phone, comprising: a smartphone camera for photographing an illegal driving car and photographing the illegal driving car by specifying a license plate of the illegal driving car through a view find area; (smart phone camera); The control module performs image processing on the license plate of the illegally parked vehicle photographed by the smartphone camera and performs an OCR (Optical Character Reader) function to recognize the vehicle number and store the recognized vehicle number. According to the smartphone-based license plate recognition system and method, it is possible to photograph and illegally drive an illegally parked car by a smartphone anytime and anywhere without using a separate fixed CCTV or vehicle-mounted mobile CCTV. In particular, the automatic photographing is performed at predetermined time intervals without the necessity of taking a moving image for a long time of 3 to 5 minutes, thereby reducing the consumption of the battery. In addition, the image processing apparatus is configured to perform the brightness and darkness processing of the image using the illuminance detected by the smartphone illuminance sensor and to correct the distortion of the image using the tilt sensed by the smartphone tilt sensor, There is an effect that the recognition rate can be improved by correcting the problem of the image.

Description

TECHNICAL FIELD [0001] The present invention relates to a smartphone-based car license plate recognition system and method,

The present invention relates to a vehicle license plate recognition system and method, and more particularly, to a motor vehicle phone license plate recognition system and method.

In the past, Closed-Circuit Television (CCTV) has been mainly used to control illegal parking vehicles. The fixed CCTV installed on the road is configured to recognize illegal parking vehicles by video and to recognize the vehicle number of the vehicle and recognize the vehicle number.

Open Patent Publication No. 10-2013-0100615 discloses such fixed type CCTV.

However, it is not possible to install fixed CCTV on all roads in order to control illegal parking vehicles. In order to solve these problems, it is easy to detect illegal parking vehicles by attaching CCTV to vehicles.

However, this method has a problem that the CCTV having a large bulky volume is used in any case, and therefore its utility is not high. There is also a limit to the restriction of illegal parking on the parking lot. There are cases where it is necessary to control only in a certain region or certain time zone in terms of regional or temporal view.

10-2013-0100615

It is an object of the present invention to provide a smartphone-based license plate recognition system.

Another object of the present invention is to provide a smartphone-based license plate recognition method.

A smartphone-based license plate recognition system according to an exemplary embodiment of the present invention is a smart phone-based license plate recognition system, which is capable of photographing an illegally parked vehicle and detecting a view find area A smart phone camera for photographing the license plate of the illegally parked vehicle by specifying the license plate of the illegally parked vehicle; And a control module for performing image processing on the license plate of the illegally parked vehicle photographed by the smartphone camera and performing an OCR (Optical Character Reader) function to recognize the vehicle number and store the recognized vehicle number .

At this time, the control module captures a color bitmap image of the vehicle license plate photographed by the smartphone camera, converts the color bitmap image into a gray bitmap image, Converts the map image into a binary bitmap image, decodes the converted binary bitmap image, and applies a Gaussian Blur Filtering technique to the decoded binary bitmap image. Can be configured to remove and perform OCR functions.

On the other hand, it can be configured to further include a smartphone illuminance sensor for sensing the illuminance of the surroundings. At this time, the control module may be configured to apply the gamma adjustment value to the gray bitmap image using the illuminance detected by the smartphone illuminance sensor.

And a smartphone gyro sensor for sensing the tilt value (x, y) of the smartphone. Here, the control module may be configured to adjust the warping of the image by adjusting the inclination of the license plate photographed by the smartphone camera using the tilt values (x, y) detected by the smartphone gyro sensor have.

On the other hand, in the control module, the smartphone camera automatically photographs the illegally parked vehicle at predetermined time intervals, determines whether the image of the illegally parked vehicle is changed during a predetermined illegal parking time, It can be configured to judge whether illegal driving is possible depending on whether or not there is a change during a predetermined illegal driving time.

The control module may be configured to automatically transmit the image of the illegally parked vehicle automatically photographed at the predetermined time interval and the vehicle number of the illegally parked vehicle to the server.

According to another aspect of the present invention, there is provided a method for recognizing a license plate based on a smart phone, the method comprising the steps of: photographing a vehicle by a smart phone camera; Determining whether the photographed vehicle is illegally illegally displayed on the display of the smartphone; Photographing the illegally parked vehicle with the smartphone camera by designating the license plate of the illegally parked vehicle through a view find area; The control module performs image processing on the license plate of the illegally parked vehicle photographed by the smartphone camera and performs an optical character reader (OCR) function to recognize the vehicle number and store the recognized vehicle number .

Here, the control module performs image processing on the license plate of the illegally parked vehicle photographed by the smartphone camera, recognizes the car number by performing the OCR function, and stores the recognized car number, A color bitmap image of a car license plate photographed by a camera is captured and converted to a gray bitmap image and the converted gray bitmap image is converted into a binary bitmap image image, decodes the converted binary bitmap image, applies a Gaussian blur filtering method to the decoded binary bitmap image, and removes noise and performs an OCR function.

The step of photographing the illegally parked vehicle with the smartphone camera by designating the license plate of the illegally parked vehicle through a view find area may be performed by a smartphone illuminance sensor to detect ambient illuminance And the control module may be configured to apply the gamma adjustment value to the gray bitmap image using the illuminance sensed by the smartphone illuminance sensor.

The step of photographing the illegally parked vehicle with the smartphone camera by designating the license plate of the illegally parked vehicle through a view find area is performed by the smartphone inclination sensor by using the inclination value of the smart phone wherein the control module controls the inclination of the license plate photographed by the smartphone camera using the tilt value (x, y) sensed by the smartphone gyro sensor, Can be configured to adjust the distortion.

Meanwhile, in the step of photographing the parking space vehicle by the smart phone camera, the smartphone camera may be configured to automatically photograph the illegal parking space vehicle at predetermined time intervals.

At this time, the control module determines whether the illegally photographed illegally parked vehicle is illegally displayed and displays the displayed illegally parked vehicle through a display of the smartphone, And judges whether or not an illegal driving accident occurs based on whether or not there is a change during the predetermined illegal driving time.

On the other hand, the control module may be configured to automatically transmit, to the server, the image of the illegally parked vehicle automatically photographed at predetermined time intervals by the smartphone camera and the vehicle number of the illegally parked vehicle.

According to the smartphone-based license plate recognition system and method, it is possible to photograph and illegally drive an illegally parked car by a smartphone anytime and anywhere without using a separate fixed CCTV or vehicle-mounted mobile CCTV.

In particular, the automatic photographing is performed at predetermined time intervals without the necessity of taking a moving image for a long time of 3 to 5 minutes, thereby reducing the consumption of the battery.

In addition, the image processing apparatus is configured to perform the brightness and darkness processing of the image using the illuminance detected by the smartphone illuminance sensor and to correct the distortion of the image using the tilt sensed by the smartphone tilt sensor, There is an effect that the recognition rate can be improved by correcting the problem of the image.

1 is a block diagram of a smartphone-based license plate recognition system according to an embodiment of the present invention.
2 is a user interface screen of a license plate recognition application according to an embodiment of the present invention.
3 is a flowchart of a smartphone-based license plate recognition method according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail to the concrete inventive concept. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a smartphone-based license plate recognition system according to an embodiment of the present invention.

1, a smartphone-based license plate recognition system 100 according to an exemplary embodiment of the present invention includes a smart phone camera 110, a smartphone illuminance sensor 120, a smartphone gyro sensor gyro sensor 130, a control module 140, a memory 150, and a mobile communication module 160.

Hereinafter, the detailed configuration will be described.

The smartphone camera 110 may be configured to photograph an illegal driving car as a camera installed in a smart phone. The user can take a tripod or a hand-held vehicle.

After a predetermined illegal driving time has elapsed, the user can designate the license plate of the illegally parked vehicle using the smartphone camera 110 and photograph it.

At this time, the control module 140 can judge whether or not illegal parking is available over time. If it is determined that illegal parking is available, the control module 140 displays a view find area on the display of the smartphone, And the vehicle license plate of the vehicle is designated through the view pint area.

The smartphone illuminance sensor 120 may be configured to detect ambient illuminance as an illuminance sensor provided in a smart phone.

The smartphone gyro sensor 130 is also provided in a smartphone and can be configured to detect the inclination of the smartphone. The smartphone gyro sensor 130 may be configured to obtain a slope value (x, y) by the slope of the smartphone.

The control module 140 may be configured to perform image processing on the license plate of the illegal driving car photographed by the smartphone camera 110. [

The control module 140 may be configured to recognize the vehicle number by performing an OCR (Optical Character Reader) function after optimizing the image recognition rate through image processing. The recognized vehicle number may be configured to be stored in the memory 150 by the control module 140. More specifically, it is as follows.

The control module 140 may be configured to capture a color bitmap image of the license plate photographed by the smartphone camera 110 and convert it to a gray bitmap image .

At this time, the control module 140 may be configured to convert the brightness detected by the smartphone illuminance sensor 120 into a gray bitmap image by applying the detected brightness to the gamma adjustment value or the brightness / darkness adjustment value. By adjusting the gamma adjustment value, it is possible to increase the recognition rate of the image according to the brightness of the day or night or the surrounding area. It is very useful in that it utilizes the hardware provided in the smartphone.

On the other hand, when a user holds a smart phone in his / her hand and shoots the image, the smart phone tilts or moves to distort the image.

At this time, the control module 140 adjusts the tilt of the license plate photographed by the smartphone camera 110 using the tilt values (x, y) detected by the smartphone gyro sensor 130 at the time of shooting, As shown in FIG. It is very encouraging that the problem of image distortion that may occur when using a smart phone is solved by itself using a smart smart phone gyro sensor 130 provided in a smart phone.

On the other hand, the control module 140 may convert the gray bitmap image into a binary bitmap image to further reduce the data.

Here, the OpecCV function can be used.

The control module 140 may be configured to decode a binary bitmap image and apply a Gaussian blur filtering technique to the decoded binary bitmap image to remove noise.

Meanwhile, the control module 140 may be configured to perform an OCR (Optical Character Reader) function from the noise-free image.

At this time, the Tesseract module, which is an open source based Android-based OCR engine, can be used.

The OCR engine can recognize the vehicle number by post processing the imaging black list and the white list.

The control module 140 can control the smartphone camera 110 to continuously photograph the illegal driving car for illegal driving time. However, in this case, a problem of the capacity of the memory 140 or a problem of battery exhaustion may occur.

Accordingly, the control module 140 can be configured such that the smartphone camera 110 automatically photographs illegal driving vehicles at predetermined time intervals. And the image of the illegally parked illegally parked vehicle may be configured to judge whether there is a change during a predetermined illegal parking time, and it may be configured to determine whether illegal parking is carried out according to whether or not there is a change during a predetermined illegal parking time have.

The control module 140 may display the viewfind through the display of the smartphone immediately when it is determined that the vehicle is illegally parked and inform the driver that the vehicle is illegally parked.

The control module 140 may be configured to automatically transmit the image of the illegally parked vehicle and the vehicle number of the illegally parked vehicle automatically taken at predetermined time intervals to the server 10.

2 is a user interface screen of a license plate recognition application according to an embodiment of the present invention.

Referring to FIG. 2, it is configured to easily photograph and store a license plate on a license plate recognition application. Such an image of the license plate can be stored and made searchable on the license plate recognition application.

3 is a flowchart of a smartphone-based license plate recognition method according to an embodiment of the present invention.

Referring to FIG. 3, a smartphone camera 110 photographs a driving vehicle (S101).

At this time, the smartphone camera 110 may be configured to automatically photograph the illegal driving car at predetermined time intervals.

Next, the control module 140 judges whether or not the photographed vehicle is illegally displayed and displays it on the display of the smartphone (S102).

At this time, the control module 140 determines whether or not the image of the illegally parked vehicle photographed previously fluctuates during a predetermined illegal parking time, and determines whether or not illegal parking is performed according to whether or not there is a change during a predetermined illegal parking time .

Next, the smartphone camera 110 specifies the license plate of the illegally parked vehicle through the view find area with respect to the illegally parked vehicle (S103).

Here, the smartphone illuminance sensor 120 is configured to sense the surrounding illuminance, and the control module 140 applies the gamma adjustment value using the illuminance sensed by the smartphone illuminance sensor 120, Image. ≪ / RTI >

The control module 140 is configured to sense the tilt value x, y of the smartphone by the smartphone tilt sensor 130 and the tilt value x, y detected by the smartphone gyro sensor 130 May be used to adjust the tilt of the license plate photographed by the smartphone camera 110 to adjust the distortion of the image.

Next, the control module 140 performs image processing on the license plate of the illegally parked vehicle photographed by the smartphone camera 110, performs an optical character reader (OCR) function to recognize the vehicle number, (S104).

At this time, a color bitmap image of the license plate photographed by the smartphone camera 110 is captured and converted into a gray bitmap image, and the converted gray bitmap image is converted into a gray bitmap image Converts the binary bitmap image into a binary bitmap image, decodes the converted binary bitmap image, and applies Gaussian blur filtering to the decoded binary bitmap image to remove noise and perform OCR function .

Next, the control module 140 automatically transmits the image of the illegally parked car and the car number of the illegally parked car automatically photographed by the smartphone camera 110 at predetermined time intervals (S105).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims. There will be.

110: Smartphone camera
120: Smartphone illuminance sensor
130: Smartphone gyro sensor
140: Control module

Claims (12)

A smart phone-based license plate recognition system,
A smart phone camera for photographing an illegal driving car and photographing the illegal driving car by designating a license plate of the illegal driving car through a view find area;
A smartphone illuminance sensor that detects ambient illuminance;
A smartphone gyro sensor for sensing the tilt value (x, y) of the smartphone;
And a control module for performing image processing on a license plate of an illegally parked vehicle photographed by the smartphone camera and performing an OCR (Optical Character Reader) function to recognize the vehicle number and store the recognized vehicle number,
The control module includes:
Adjusting the tilt of the license plate photographed by the smartphone camera using the tilt value (x, y) sensed by the smartphone gyro sensor to adjust the distortion of the image, Captures a color bitmap image, applies it to the gamma adjustment value using the illumination sensed by the smartphone illuminance sensor, converts the gray bitmap image into a gray bitmap image, The image is converted into a binary bitmap image, the converted binary bitmap image is decoded, and a Gaussian blur filtering method is applied to the decoded binary bitmap image to remove noise And configured to perform OCR functions,
The control module includes:
The vehicles having been illegally parked in a predetermined illegal parking area are photographed in one image at predetermined time intervals and the OCR function is performed among the vehicles photographed at predetermined time intervals to determine whether there is a vehicle whose illegal parking time has elapsed And when the illegal parking time has elapsed as a result of the determination, the user can use the smartphone camera to photograph the illegally parked vehicle, view find area and output an alarm sound through a speaker, and automatically transmit an image of the license plate of the illegally parked vehicle and a vehicle number to a server. delete delete delete delete delete A method for recognizing a license plate based on a smart phone,
Photographing a parking space vehicle by a smart phone camera;
Determining whether the photographed vehicle is illegally illegally displayed on the display of the smartphone;
Photographing the illegal driving vehicle with the smartphone camera by designating the license plate of the illegal driving vehicle through a view find area;
The control module performs image processing on the license plate of the illegally parked vehicle photographed by the smartphone camera and performs an optical character reader (OCR) function to recognize the vehicle number and store the recognized vehicle number;
The control module automatically transmitting an image of an illegally parked vehicle photographed automatically at predetermined time intervals by the smartphone camera and a vehicle number of the illegal parking space vehicle to a server,
The step of photographing the illegal driving vehicle by the smartphone camera by designating the license plate of the illegal driving vehicle through the view find area,
(X, y) of the smartphone by a smartphone gyro sensor, and the control module is configured to detect the tilt value (x, y) of the smartphone using a tilt value (x, y) sensed by a smartphone gyro sensor, Adjusting a tilt of a license plate photographed by the smartphone illuminance sensor to adjust the warping of the image, detecting the illuminance of the surrounding area by a smartphone illuminance sensor, and using the illuminance detected by the smartphone illuminance sensor, Lt; / RTI >
Wherein the control module performs image processing on the license plate of the illegally parked vehicle photographed by the smartphone camera, recognizes the car number by performing the OCR function, and stores the recognized car number,
Capturing a color bitmap image of a license plate photographed by the smartphone camera to convert it to a gray bitmap image and converting the converted gray bitmap image into a binary bitmap image a binary bitmap image, a binary bitmap image is decoded, a Gaussian blur filter is applied to the decoded binary bitmap image to remove noise, and an OCR function is performed.
The step of photographing the driving vehicle by the smart phone camera comprises:
Wherein the smartphone camera is configured to automatically photograph the parked vehicles parked in a predetermined illegal parking space area with one image at predetermined time intervals,
Wherein the control module determines whether the photographed vehicle is illegally illegally displayed on the display of the smartphone,
It is determined whether or not there is a vehicle whose illegal parking time has elapsed from among the vehicles photographed at predetermined time intervals by an OCR function based on the recognized car number,
The step of photographing the illegal driving vehicle by designating the license plate of the illegal driving vehicle through the view find area by the smartphone camera,
If it is determined that there is a vehicle whose illegal driving time has elapsed from among the vehicles photographed at the predetermined time intervals, as a result of the judgment of the recognized car number by performing the OCR function, if there is a vehicle whose illegal driving time has elapsed, And displays the view find area on the license plate of the illegally parked vehicle so that the vehicle license plate of the illegal parking vehicle can be photographed by using the camera and output an alarm sound through the speaker How to recognize phone based license plates.
delete delete delete delete delete
KR1020150186575A 2015-12-24 2015-12-24 System and method for recognizing license plate based on smart phone KR101797696B1 (en)

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KR102033732B1 (en) * 2018-06-19 2019-10-17 건아정보기술 주식회사 Method for recognizing license number of vehicle regardless of direction and device having function thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101057882B1 (en) * 2011-02-28 2011-08-19 심광호 Wanted-vehicle and illegal parking crackdown system
KR101390179B1 (en) * 2013-12-12 2014-04-29 (주)엔토스정보통신 A two-way system for crackdown on illegal parking/stop and crime prevention and a two-way method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101057882B1 (en) * 2011-02-28 2011-08-19 심광호 Wanted-vehicle and illegal parking crackdown system
KR101390179B1 (en) * 2013-12-12 2014-04-29 (주)엔토스정보통신 A two-way system for crackdown on illegal parking/stop and crime prevention and a two-way method thereof

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