Analysis of the principle of electronic police technology

The electronic police is an automatic detection and measurement technology to capture traffic violations or traffic accidents. The network collects the collected information and sends it back to the relevant departments for analysis and treatment, and uses this as evidence to punish the perpetrators to reduce accidents and assist the traffic police. The method of work. Compared with the traffic police supervision, the electronic police judges the accident more accurately, captures more quickly, can still work normally under the night and 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 sensing line to sense the pressure from the car on the road. The signal is collected by the sensor to the central processor, and the register is temporarily stored (the data is valid in a red light cycle);

2. In the same time interval (within 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 the time, your head wheel is over the line, and then the wheel If there is no line, only one pulse is generated, and when there are no consecutive two pulses, no picture is taken;

3. Some situations are: Some people drive the front wheel over the line, afraid to be photographed, so he dumps the car and returns to the line. The result is still taken. What is the reason? Because it is tandem, A "pair" of pulse signals is generated (this pair of pulses are 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 transmitted 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.

License plate recognition rate-----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 embed the induction coil underground, the digital camera is set on the crossbar for capturing the red light, and the other is to set up the camera for real-time video recording of overspeed, red light, illegal parking, etc. Either way, at least three pictures will be taken for illegal vehicles, one is an instant violation picture, one is a number plate identification picture, and one is a panoramic picture. Either way, it is a 24-hour boot, and the picture retention time is usually one week.

2. Violation process

When the command center receives the picture, it compares the license plate number information with the information of the vehicle management office, so as to call out the comprehensive information of the vehicle, such as the owner, model, color, etc., and then the information processing personnel enter the website of the Public Security Traffic Management Bureau, so that Illegal owners can make inquiries.

3. Information loss problem

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

4, shooting range:

A camera usually takes only one lane, and a few can take two lanes, usually located on the first and second lanes from left to right. Digital cameras have a wide range of shots, so most of the urban areas are able to capture all lanes in the same direction.

The 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

The vehicle detectors currently used in electronic police in various cities are coil sensors and video detectors. Buried induction coil detectors have been widely used in previous years due to their high reliability, high accuracy and low price. However, with the development of electronic technology, the development of large-scale, ultra-large-scale integrated circuits, functions With the emergence of powerful digital processing chips, vehicle video detection technology has made breakthroughs and developed quite mature. Compared with the coil detection technology, the superiority and high cost performance have gradually been recognized by the industry, representing the development and application direction of the future vehicle detection field.

The video vehicle detector is an integrated system for detecting and analyzing the running condition of road vehicles based on video image analysis and computer vision technology. It analyzes incoming traffic images in real time, tracks vehicles in the image, and obtains various traffic data.

The main advantages of video vehicle detectors:

1. Using a panoramic camera as a video sensor, it does not need to cut and damage the road surface, and even lay a long coil feeder cable, which minimizes the time of closing the road. In addition, the position of the video virtual coil can be arbitrarily placed as needed, and the induction coil can not be moved arbitrarily according to the change of the road condition after being installed at one position, otherwise repeated cutting of the road surface will seriously affect the service life of the road.

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

3. The life of the induction coil is about 2-5 years (depending on traffic volume and road surface temperature), and the 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 surface reflection, vehicle shadows, harsh weather and various lighting conditions, it can accurately and reliably detect data, 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 vehicles, and detect General traffic accidents and other special traffic accidents. The detector can be installed on a road traffic trunk or an important traffic observation point to replace a traditional traffic observatory. In addition, video vehicle detection technology is used in red light, speeding, and forbidden mobile electronic police systems, and conventional buried induction coils are being replaced.

As the core technology of traffic monitoring, license plate recognition is applied in many subsystems, such as red light monitoring system, overspeed monitoring system, retrograde monitoring system, forbidden monitoring system, bus lane monitoring system, non-motor vehicle road monitoring system, pressure double 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 past automatic registration, verification, road toll, vehicle safety verification, community, parking lot management and so on.

The system uses video real-time triggering method to detect and capture, and can automatically detect, accurately identify and verify the vehicle license plate number of the vehicle in driving or parking. The captured image and the database data can be compared in time. When the vehicle is found to be intercepted, the system can promptly report the alarm on the local machine and the central machine. The system adopts advanced fuzzy image processing technology, which can realize the treatment of the overall tilt of the license plate, the tilt of the license plate, the staining and blurring of the license plate, etc., and identify the license plate number that is difficult for the human eye to distinguish.

CSRM safety relay fulfills the safety requirements of ISO13849- 1Cat.4, applies to monitoring of signals of industry field with high safety requirements, including emergency stop signal, safety gate switch signal, Safety Light Curtain signal, safety light curtain signal with pulse output and two-hands button signal.


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