Analysis of Electronic Police Technical Principles

Electronic police is a method that uses automated detection and measurement technology to capture traffic violations or traffic accidents, and uses the network to send the collected information back to relevant departments for analysis and processing, and uses this as evidence to punish the perpetrators to reduce accidents and assist traffic police. Working method. Compared with the traffic police supervision, the electronic police has a more accurate judgment on the accident and catches more quickly. It can still work normally in the dark and in bad conditions, and at the same time reduces the manpower expenditure of the traffic police!

How electronic police work

1. The electronic eye uses the induction line to sense the pressure from the car on the road, collects the signal to the central processor through the sensor, and sends it to the register for temporary storage (the data is valid within a red light cycle);

2. In the same time interval (in the red light cycle), if two pulse signals are generated at the same time, it is regarded as "valid". Simply put, if the red light is at that time, your head wheel is over the line, and then the wheel If there is no outgoing line, only one pulse is generated. When there are no two consecutive pulses, no picture is taken;

3. Some situations are: Some people drove the front wheel across the line, afraid of being photographed, so he reversed the car and returned to the line, but the result was still taken. What is the reason? It is because one after the other, A "pair" of pulse signals was generated (this pair of pulses was generated during the same red light cycle).

Post-processing:

After the image is downloaded and transmitted to the command center, the image needs to be registered, numbered, and announced, and then transferred to the central computer database for use by various agencies.

System Features:

Vehicle capture rate-100% (excluding two-wheeled motorcycles, etc.).

Recognition time ----- about 1 second.

The license plate recognition rate is more than 95% during the day and more than 90% at night (higher).

Applicable speed ------ 5-180Km / h.

1. The principle of illegal TV capture

There are two ways, one is to bury induction coils underground, erect a digital camera on the crossbar to capture the red light, and the other is to set up a camera to record real-time video of speeding, red light and illegal parking. Either way, at least three pictures will be taken of the illegal vehicle, one is an instant illegal picture, one is a number plate recognition picture, and one is a panoramic picture. Either way, it is 24 hours to start shooting, the picture retention time is generally one week.

2. Processing of violations

After receiving the picture, the command center will compare the license plate number information with the information of the vehicle management office, so as to call up the comprehensive information of the vehicle, such as the owner, model, color, etc., and then the information processing personnel will enter the website of the Public Security and Transportation Administration to make Owners of illegal vehicles can make inquiries.

3. Information loss

Not all illegal vehicles can be photographed. Only when the license plate picture is clear, the information entry personnel can enter the illegal vehicles into the database for processing.

4. Shooting range:

A camera usually only shoots one lane, and a few can shoot two lanes, which are usually located on the first and second lanes from left to right. Digital cameras have a wide shooting range, so most of the urban areas can photograph all lanes in the same direction.

Main technical functions of electronic police (1)

The main core parts of the electronic police are vehicle detection technology, motor vehicle license plate recognition technology and video camera.

Vehicle video detection technology

At present, the main vehicle detectors used in electronic police in various cities are coil sensors and video detectors. Buried induction coil detectors have been widely used in the past few years because of their high reliability, high accuracy, and low price, but with the development of electronic technology, the development of large-scale and ultra-large-scale integrated circuits, functions With the emergence of powerful digital processing chips, vehicle video detection technology has made breakthroughs and developed quite maturely. Compared with the coil detection technology, the advantages and high cost performance have been gradually recognized by the industry, and represent the future development and application direction of the vehicle detection field.

Video vehicle detector is an integrated system based on video image analysis and computer vision technology to detect and analyze the operation of road vehicles. It can analyze the input traffic images in real time, track the vehicles in the images, and obtain various traffic data.

The main advantages of video vehicle detector:

1. Using a panoramic camera as a video sensor, it does not need to cut and destroy the road surface, or even lay a long coil feeder cable, which minimizes the time to close the road. In addition, the position of the video virtual coil can be arbitrarily placed as needed, and the induction coil cannot be moved arbitrarily according to the changes in road conditions after being installed in a position, otherwise repeated cutting of the road surface will seriously affect the life of the road.

2. The position of the video virtual coil can be adjusted arbitrarily according to road conditions, and its coil function attributes can also be set according to needs, such as: presence, delay, delay, pulse and count. Different coils with different attributes can be used to achieve different control requirements. Multiple virtual coils can be set for each video image.

3. The service life of the induction coil is about 2-5 years (depending on traffic volume and road temperature), and the service life of the video detector is more than 10 years.

4. Using digital signal processing technology (DSP) and advanced algorithms, video detection can face the challenges of road reflection, vehicle shadows, harsh weather and various lighting conditions. It can accurately and reliably detect data and truly achieve all-weather detection control.

Vehicle video detection technology is the most complex application in traffic information collection, statistics, and analysis. This video traffic detector uses video processing and recognition technology to construct an observation station that can automatically extract several traffic flow parameters, automatically classify vehicle models, and detect General traffic accidents and other special traffic accidents. The detector can be installed in highway traffic arteries or important traffic observation points, used to replace traditional traffic observation stations. In addition, in the red light, speeding, and forbidden mobile electronic police systems, video vehicle detection technology is used, and the traditional buried induction coil is being replaced.

As the core technology of traffic monitoring, license plate recognition is applied in multiple subsystems, such as red light monitoring system, speeding monitoring system, retrograde monitoring system, prohibited traffic monitoring system, bus lane monitoring system, non-motorized lane driving monitoring system, and dual Yellow line monitoring system, emergency parking belt driving monitoring system, mobile vehicle inspection system, etc. The intelligent multimedia network license plate recognition system is widely used in the automatic registration and verification of passing vehicles, highway tolls, vehicle safety verification, community, parking lot management, etc.

The system adopts real-time video triggering method to detect and capture, which can automatically detect, accurately identify and verify the vehicle license plate number of vehicles in driving or parking. The captured image can be compared with the database data in a timely manner. When it is found that the vehicle should be intercepted, the system can alarm in time on the local machine and the central machine. The system adopts advanced fuzzy image processing technology. Through the program, it can process the overall tilt of the license plate, the text tilt of the license plate, the stain and blur of the license plate, etc., and recognize the license plate number that is difficult for human eyes to recognize.

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