KR20100040822A - System for enforcing illegal parking/stop vehicle - Google Patents

Abstract

PURPOSE: A system for cracking down an illegal stooping or parking vehicle is provided to automatically crack down the vehicle using a microwave sensor which senses multi target vehicles. CONSTITUTION: A microwave sensor(20) positions a microwave pulse from an antenna on an illegal stopping or parking crackdown section, receives a signal which returns from the vehicle on the illegal stopping or parking crackdown section, and calculates the position of the vehicle. A vehicle image photographing unit(21) photographs the image of the vehicle according to the calculated position of the vehicle by the microwave sensor. A controller(22) stores the position information of the vehicle outputted from the microwave sensor, recognizes a license plate of the image of the vehicle photographed by the vehicle image photographing unit, and stores a recognition result.

Description

System for enforcing illegal parking / stop vehicle}

The present invention relates to a parking vehicle violation control system, and more particularly, to a stationary parking vehicle violation control system that can automatically detect and crack down on a parking vehicle violation using a microwave sensor capable of detecting a multi-target vehicle. will be.

In general, a vehicle violating vehicle enforcement system is a system for detecting illegally parked vehicle enforcement sections such as roads, detecting vehicles that are stopped, and automatically recognizing license plates of detected vehicles. Stopping vehicle violating system can be largely classified into fixed, driving, and portable type, and there are many fixed parking vehicle violating systems. Fixed parking vehicle violation control system is a system that cracks and installs a camera and a vehicle detection device on a support in a road section where a lot of illegal parking vehicles are frequently used. Such a fixed parking vehicle violation control system includes a vehicle detection device for detecting a parking vehicle violation, and the vehicle detection device mainly uses a laser method and a camera image analysis method.

As an example, as shown in FIG. 1, a vehicle is detected by a laser method to detect a parking vehicle violation, and an integrated camera recognizes and cracks down a license plate. Referring to the system operation of FIG. 1, the camera 101 and the laser sensor 103 of the camera unit 100 are built in one housing so that vertical rotation of the camera unit rotation driving unit 200 is simultaneously performed. That is, the camera 101 and the laser sensor 102 are always on the same point because the camera 101 and the laser sensor 103 are always moved simultaneously in the vertical direction. Will be watching. By analyzing the pattern of the distance data measured by the laser sensor 103, it is determined that there is a vehicle or an object at this point when a nonlinear distribution suddenly appears. In this case, the camera unit rotation driver 200 finely analyzes the movement width to perform precise pattern analysis. By predicting that the analyzed object is a vehicle, the moving part of the camera rotating driver 200 is maintained at the start point or the end point of the pattern change and the distance from the subject is measured. When the distance from the subject is measured, the camera controller 102 controls the zoom, focus, and up, down, left, and right movements of the camera 101. After accurately adjusting the zoom, focus, and movement state, when the image processor 302 analyzes the image input from the camera 101 and determines whether the license plate of the vehicle exists, it is determined whether the detected object is the vehicle.

However, such a laser system has a problem in that the control is complicated and the vehicle detection time is required because the laser sensor must be moved by the rotation driving unit. In addition, there is a disadvantage that the distance that can be detected is limited because the vehicle is detected by a point scan method.

As another example, it is disclosed in Republic of Korea Patent Registration No. 10-0599587 as a camera-type parking stop violation system. The registered patent specifies several representative points inside the fixed camera view and obtains PTZ (Pan, Tilt, Zoom) values through manual operation for the points, and then interpolates the approximate values for all points except the representative points. By obtaining and storing the data in a lookup table, the present invention relates to a technique for automatically aligning the center of a PTZ camera precisely to a specified point without manual manipulation, regardless of the point specified in the fixed camera view.

However, such a camera method has a problem in that the accuracy of the pan tilt angle and zoom focal length decreases due to the mechanical error of the gear motor as the intermittent operation time passes. In addition, there is a problem in that it is difficult to crack down at night and sensitive to environmental changes such as surrounding buildings and shadows of trees in the crackdown section.

   [Patent Documents]

Document 1 KR 10-2007-0013610 A 2007.01.31.

[Reference 2] KR 10-0599587 B1 2006. 07. 19.

Document 3 KR 10-0531608 B1 2005. 11. 29.

Accordingly, an object of the present invention is to provide a parking violation control system that is capable of detecting and cracking a parking violation vehicle with a microwave sensor.

In order to achieve the above object, the parking violation vehicle control system of the present invention receives a signal from a vehicle that enters the illegal parking stop area by placing a microwave pulse from an antenna and enters the illegal parking stop area and receives a signal from the vehicle. The microwave sensor unit for calculating a, the vehicle image photographing unit for taking an image of the vehicle of a predetermined size according to the position of the vehicle calculated by the microwave sensor unit, the position of the vehicle output from the microwave sensor unit And a controller configured to store information, recognize a license plate of the vehicle image photographed by the vehicle image photographing unit, and store and control the recognition result.

According to the present invention, by using a smart microwave sensor capable of detecting a multi-target vehicle, the vehicle may be violated by violating a parking vehicle, thereby simultaneously detecting and cracking down a plurality of vehicles entering the illegal parking control area, and changing environmental conditions such as weather and night. Regardless of whether it can be cracked in all weather regardless of the situation, it can improve the performance of the parking violation cracking system as well as greatly improve crackdown equity.

1 is a block diagram of a conventional parking vehicle violation control system
2 is an overall system block diagram illustrating the present invention.
Figure 3 is a microwave sensor block diagram according to the present invention
4 is a diagram illustrating an example of detecting a multi-target vehicle according to the present invention.

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

2 is a system block diagram for explaining the present invention is largely composed of a field system and a central center system. The field system includes a microwave sensor unit 20, the vehicle image photographing unit 21 and the control unit 22, and a peripheral device 23 for the control system, the peripheral device 23 is an LED lighting unit for night control , A speaker for intermittent broadcasting, and a communication unit for data transmission to the central center system 24. The central center system 24 processes data transmitted from the field system, and performs database management and output of penalties.

The microwave sensor unit 20 calculates a position distance value of the vehicle by placing a microwave pulse in the illegal parking control zone and receiving a signal from the vehicle parked in the illegal parking control zone. The calculated position distance value of each vehicle is input to the controller 22, and calculates camera adjustment parameters of zoom, focus, and up, down, left, and right angles according to the position distance value. The vehicle image capturing unit 21 captures a vehicle image based on a camera adjustment parameter value calculated by the controller 22 and transmits the captured image to the controller 22. The controller 22 stores the detected vehicle position distance value and the camera adjustment parameter value, and recognizes the vehicle number by photographing the same vehicle at a predetermined time period.

3 is a block diagram of the microwave sensor unit according to the present invention, which is composed of an RF unit 30 and a signal processor 31. The RF unit 30 serves to transmit and receive microwave pulses to the antenna. Microwave pulses use Frequency Modulation Continuous Waveform (FMCW) Millimeter Wave to locate the exact vehicle position. The frequency band is 24 GHz, which is the ISM band. The FMCW millimeter wave modulates a continuous transmission wave and radiates to the antenna through the transmission end TX. The radiated FMCW milliwaves are reflected from the target vehicle and received by the receivers RXA and RXB. The mixer amplifier amplifies and converts the received FMCW milliwaves and the reference frequency into an intermediate frequency (IF signal). The signal is output to the signal processor 31.

The signal processor 31 removes the noise from the IF signal output from the RF unit 30 through a low pass filter, and then converts the IF signal into a digital signal through an A / D converter (A / D). The signal processing processor (DSP) performs a fast fast frequency transform (FFT) operation on the digital signal from the A / D converter to find the peak point of the signal. The peak point of the signal is processed by a Kalman filter to track the target vehicle entering the illegal parking area and predict its exact location.

4 is a diagram illustrating a sensed example of a multi-target vehicle according to the present invention, and is a screen capturing a result of processing on an actual road 40. In FIG. 4, there is an actual road view 40, and a portion of the microwave sensor 41, a portion 42 showing a microwave pulse beam emitted from the microwave sensor 41, and a dotted line 43 are shown. It displays the number of detected vehicles. The position of the vehicle is calculated by the Doppler principle. The equation for calculating the position of the vehicle according to the Doppler principle is as follows.

f ₁ is the frequency in the section where the speed increases, f ₂ is the frequency in the section where the speed decreases,

here,

f _d : Doppler frequency,

c: luminous flux, f ₀ : center frequency of the transmitted wave

f _m : Repetition frequency of transmitted wave

Δf: modulation width of the transmission wave

R: Distance to vehicle

The sum of f ₁ and f ₂ and the difference can be used to find the distance to the vehicle.

When the vehicle is stopped with microwave pulses, the speed value becomes "0",

f ₁ = f ₂ Therefore, the position distance R to the vehicle is given by the following equation.

CAN data interface of Figure 3 is a data interface including RS-232, RS-422, RS-485, Ethernet

Claims (4)

In a parking violation control system that includes a central center system,
A microwave sensor unit for placing a microwave pulse (including a millimeter wave) from an antenna in an illegal parking control zone and receiving a signal from a vehicle parked in the illegal parking control zone to calculate a location of the vehicle;
A vehicle image photographing unit which photographs an image of the vehicle having a predetermined size according to the position of the vehicle calculated by the microwave sensor unit;
And controlling the vehicle to store location information output from the microwave sensor unit, and to recognize the license plate of the vehicle image photographed by the vehicle image photographing unit and to store and control the recognition result. system
The apparatus of claim 1, wherein the controller has a database of position information of all vehicles detected by the microwave sensor and a database of camera zoom, focus, and up, down, left, and right angles, and photographs the same vehicle at a predetermined time period. Parking violation vehicle control system, characterized in that to control to The system of claim 1, wherein the microwave sensor unit simultaneously detects all vehicles entering the enforcement zone. The system of claim 1, wherein the microwave sensor unit emits microwave pulse types of frequency-modulated continuous millimeter waves.

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