Today, with the rapid development of the social economy, the living standards of urban residents are constantly improving, and motor vehicles have become an indispensable means of transportation for people. How to effectively manage motor vehicles, how to punish and reduce traffic violations, how to quickly detect traffic accidents and motor vehicle theft cases has become an issue that governments and traffic control departments are paying more and more attention to. Therefore, the installation and implementation of the urban intelligent traffic monitoring system has become the focus of the management department.
Intelligent traffic monitoring system provides picture monitoring, vehicle inquiry, illegal inquiry, intelligent judgment, cloth control, traffic statistics analysis; real-time picture monitoring road vehicle information, synchronization picture overlay time, capture location, license plate number, license plate color, body color, device name , speed, speed limit, lane, red light time and snap number; support the real-time refresh and stop refresh operation of the bayonet vehicle information; support a variety of vehicle research modes such as first time, frequent, high-risk time, support vehicle behavior analysis and query mode Interval, collision, traveling car, deck car; real-time monitoring of traffic road conditions, providing identification of vehicle number plate characters, identification of vehicle number plate color, identification of body color, detection of vehicle speed and other bayonet functions, while also providing red light, not by lane Driving, illegal lane change, retrograde, pressure (solid) line and other functions; support by entering license plate number, owner information, body color, body length, vehicle type, license plate color, cloth control mechanism and overnight unit, cloth control type, control contact, Information such as the control time is controlled.
The urban intelligent traffic monitoring system is divided into high-definition electronic police system and high-definition smart bayonet system according to its functions.
1 HD electronic police system
1.1 System Overview
Red light violations are one of the main hidden dangers of traffic accidents in today's society. The electronic police system can be widely used in unattended intersections, one-way lines, forbidden lines, time-limited roads, restricted vehicle lanes, main and auxiliary roads for import and export, bus lanes, illegal speeding, pressure lines, lane changes, etc. Use technology to achieve effective monitoring and governance of violations.
1.2 System Solution
The high-definition electronic police system consists of intersection front-end equipment, network transmission system and central management system.
The system adopts the pure video detection mode to automatically detect, lock and track the moving objects in the video stream image in real time, and judge whether the vehicle is in violation according to the vehicle motion track. The system uses high-definition intelligent CCD camera as the main body of image acquisition. The single camera covers one-way 2-3 lanes, and integrates “image acquisition + vehicle detection + license plate recognition + violation judgmentâ€. LED cold light is used as nighttime fill light. Reduces the stimulation of the human eye; the system structure is simple, easy to install and maintain, only one network cable and power cord can be used on the pole, each direction equipment: 1 (camera) + 1 (fill light) + 1 (controller ). The overall structure of the system is as follows:
(1) Front-end equipment at the intersection:
The front-end equipment of the intersection is mainly composed of video capture equipment (HD smart camera, fill light), network transmission equipment (optical transceiver or optical transceiver), etc., complete traffic light status detection, motor vehicle violation behavior detection, illegal picture capture, fill light control , illegal recording of local storage, related information network uploading tasks. According to actual needs, one set of intersection front-end equipment is installed in each direction of the monitored intersection, which can monitor the traffic conditions of 2-3 lanes. The front end structure is shown in the following figure:
HD capture camera: The high-definition camera used in the system can monitor 2-3 lanes, using DSP embedded high-performance processing platform, embedded recognition software includes video capture, image pre-processing, vehicle detection, license plate detection, license plate cutting Modules for point, character recognition, tracking and comparison, image compression, data transfer, etc. The system recognition speed is fast, especially the unique moving object tracking and comparison technology can make full use of the effective information between frames, does not rely on a single picture, and effectively improves the recognition accuracy of the system and the adaptability to complex environments.
LED fill light: The auxiliary light source adopts LED light, and the photosensitive control module design can be automatically activated. When the ambient light is lower than the preset brightness, the light source is automatically turned on to fill the camera to ensure the nighttime camera effect. The light-emitting device is a high-power LED with an average time between failures: MTBF ≥ 30,000 hours.
Network transmission equipment: including switches, optical transceivers, etc., undertakes the task of transmitting vehicle illegal information recorded by the front-end equipment to the back-end management center.
(2) Network transmission system
It mainly undertakes the task of transmitting the vehicle illegal information recorded by the front-end equipment to the back-end management center. At the same time, the operator applies the remote management software on the central platform to remotely manage, monitor the state, and set the device parameters of the front-end equipment. The transmission network can adopt optical fiber communication, telephone dialing, data private line, broadband network, optical fiber network, wireless 3G and the like. If the optical transceiver is shared with the video surveillance system, the digital-to-analog optical transceiver can be used to transmit the video signal and control signal of the video surveillance system front-end camera on a single-mode optical fiber, and provide a 100M Ethernet port for transmitting the red light electronic police. Automatically monitors illegal vehicle information recorded by the front-end equipment of the system.
(3) Central Management System
The central management subsystem mainly implements remote management of electronic police front-end intersection equipment, network monitoring, processing of captured images and data, and penalties for illegal vehicles, and fully considers the compatibility of interfaces with other traffic management software systems. The management center adopts a central management server to connect multiple clients, and a proxy server is used to process the front-end device network data. One proxy server administers multiple front-end devices. The database is used to record various parameters of the central server and the network and identification information of the proxy server. The storage array is used to store pictures and related data information captured by the front-end device.
1.3 System functions
1) Video detection vehicle function
The system accurately tracks the vehicle's motion trajectory through video detection, determines the vehicle's straight, retrograde, and left-right direction, and records the vehicle's front, stop, and cross-line conditions, as well as the vehicle's lane separation line, without the need to embed coils. The principle of video detection is to detect the outline of the vehicle while tracking the moving object and find the license plate for tracking. If the license plate is not found, the system will capture the vehicle and the recognition result is “not detectedâ€. In the nighttime, the LED fill light will fill the license plate, and the accuracy of the video detection is increased according to the principle of the license plate reflection, which solves the problem of interference of pedestrians, bicycles and large vehicles.
2) Red light capture function
A single HD camera can completely monitor 3 lanes, and the picture quality meets the national standard. In the red signal state, when the vehicle passes, the system will quickly track the vehicle's driving trajectory, and analyze the trajectory to determine whether there is a vehicle. When the vehicle is detected to have a red light violation, it will immediately capture three high-definition pictures reflecting the illegal information of the vehicle and save the pictures. In the first picture, the front end of the motor vehicle with red light is clearly reflected, the red light signal, the vehicle type, the license plate number, and the body color. The second body of the motor vehicle clearly reflecting the red light has passed the stop line and the red light signal. , vehicle type, body color, license plate number; the third picture can clearly reflect the road center extension line, vehicle type, body color of the same motor vehicle crossing the adjacent direction. Clearly reflect the entire red light process.
3) Imprisonment orders, violations of prohibited markings, etc.
The system can judge the right/left turn, reverse driving, pressure line, over-line, violation of the prohibition line, motor vehicle driving in the non-motor vehicle lane, etc. through intelligent analysis of the video, and the right/left turn intersection can be Turn right or turn left to track and judge the illegal vehicles, and capture the reverse driving and other illegal activities. The system captures three illegal pictures to record the illegal process.
4) Bayonet function
The system has a rear-end bayonet function, that is, in the green light and yellow light state, all vehicles passing through each lane are detected, captured, recorded, saved and identified. The vehicle additional information includes the following contents: the number of effective frames, the vehicle detection time, the vehicle type, the lane number, the driving type, whether it is illegal, and whether it is retrograde. Stop the traffic light in front of the line. Stop the line after the traffic light status. The name of the intersection, the direction of the intersection.
5) License plate recognition function
The system has the ability to automatically identify the car number plates for civilian, police, military, and armed police. The identification rate of the number plate in the day is greater than 95%, and the recognition rate of the number plate at night is greater than 90%.
6) Model and color recognition
The system uses the combination of license plate color and video detection technology to classify the vehicle, and can automatically identify the four license plate colors of black, blue, yellow and white. For civilian vehicles, blue color license plates represent small vehicles, while yellow color license plates represent large vehicles. Therefore, the vehicle type is first judged by the license plate color. For the case where the vehicle type cannot be determined based on the license plate color or the license plate color cannot be judged, image analysis technology is used to assist in distinguishing the type of the vehicle.
2 HD smart bayonet system
2.1 System Overview
The HD smart card port monitoring and management system is an important part of the safe city system. It installs high-definition smart bayonet system in key areas such as interprovincial, intercity, urban main roads, main traffic routes, main entrances and exits, highways, and toll stations. Real-time recording and monitoring of passing vehicles, monitoring of traffic violations, and organic integration with road monitoring, not only clear vehicle traffic information, vehicle shape, license plate number, and front passengers on the monitored road surface Features, etc. are automatically acquired, transmitted and processed 24 hours a day, 7 days a week.
2.2 System Solution
The high-definition smart bayonet system is purchased from the bayonet vehicle recording subsystem, the central management subsystem and the network communication subsystem.
The bayonet vehicle recording subsystem is the core part of the road vehicle intelligent monitoring and recording system. The system consists of embedded integrated capture host, synchronous fill light unit strobe flash, vehicle detection unit and network transmission unit. By capturing all the vehicles passing through the road bayonet, the vehicle image is obtained, and the license plate characters are automatically recognized in real time, and the time, model, license plate number, direction and other data of the vehicle are recorded; and all of them are imported into the network communication subsystem. Optical fiber transmission to the central management platform.
The central management subsystem mainly implements remote management of the bayonet device, network monitoring, processing of captured images and data, deployment of suspicious blacklisted vehicles, downloading of prepaid vehicle data, and penalties for illegal vehicles, and fully considering Interface compatibility issues with other traffic management software systems.
The network communication subsystem mainly realizes the transmission system topology diagram of the data and image information of the bayonet vehicle recording part and the command center management part:
2.3 System functions
1) Vehicle capture: The system uses coil/video detection to capture passing vehicles. A high-performance vehicle detector is used to monitor all passing motor vehicles in the detected lanes, with a vehicle capture rate of over 99%. The coil detection method has high capture rate and high accuracy. It can capture unlicensed vehicles and shield the number plate vehicles, and is not affected by weather such as rain, snow and light, thus ensuring the correctness and reliability of public security law enforcement.
2) Vehicle speed measurement: The system adopts coil/video speed measurement mode to measure the speed of each passing vehicle in the monitoring area within the speed range of 0km/h to 180km/h, save the vehicle picture, and cover the time and place on the picture. Information such as speed, lane, etc. For speeding vehicles, they can be saved to the appropriate location and uploaded to the center according to customer needs. When the speed is 30 km / h
3) Image recording: The system adopts high-definition industrial camera. The whole camera system is a sophisticated system consisting of embedded integrated capture host, synchronous fill light unit strobe flash, vehicle detection unit, network transmission unit, power supply unit and all-weather protective cover. The precise fit between them makes the image of the vehicle captured during the day and night very sharp.
4) License plate recognition: The system adopts the domestic leading image recognition algorithm to automatically realize license plate recognition for all passing vehicles.
5) Controlled alarm: For the speeding and stolen vehicles and traffic accidents, the escaped vehicles can be equipped with alarms in real time. For prepaid vehicles, the query can be confirmed in real time.
6) Traffic statistics: The system can query according to the time, model, lane, direction according to the needs, and carry out traffic statistics (including flow graph, flow meter, flow graph), and issue daily report, weekly report, monthly report, annual report. Wait.
7) Breakpoint resume: The system supports multiple ways of data transmission. The illegal data can be automatically uploaded by FTP, the vehicle passing information (time, location, license plate number, etc.), equipment monitoring data, traffic statistics, etc. can be uploaded to the central management system; the front-end equipment can also be downloaded and controlled in the center through the TCP/IP network. If the network is interrupted or other faults, the information is backed up and stored in the front-end device. After the fault is recovered, it is automatically uploaded. It has the function of resuming the breakpoint. The data in the front-end device can also be directly downloaded through the USB storage device.
8) Information inquiry: The system can query and collect statistics on vehicle traffic information, vehicle illegal information, control/disarming information, system operation log information, and system operation log according to different conditions. Including real-time monitoring of passing vehicles, accurate vehicle query, fuzzy query, control query, alarm query, traffic statistics of traffic, etc. The information of the query can be printed and output in various forms.
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