What is the principle of speed measurement and photography on the road?

There are several types of vehicle detectors:

1.Coil type, there are 2 groups of induction coils buried under the road surface, when the vehicle passes, divide the distance of the two groups of coils by the time difference of detection, and the vehicle speed is obtained.

2.The microwave type and the radar type are basically the same.

The coil velocity measurement is more classic, and the detection effect is also good. For example, in the south of China, such as Shanghai, Guangdong and other regions, this method is mostly used. According to the speed of the vehicle passing through the parallel coil, it is judged whether it is overspeeding, and the camera is used for evidence.

The disadvantage of this detection method is that the construction amount of the induction coil buried in the ground is large, and the road surface needs to be re-buried once the road surface is changed, and the maintenance work of the coil is huge in the place where the high latitude freezing period and the low latitude summer road surface and the road surface quality are not good.

Detection through the analysis of continuous images, track the process of illegal vehicle behavior, and take pictures through analysis and control to capture violations. The advantage of this system is that it is not limited by road surface conditions, and it does not need to destroy the road surface for installation, or bury an induction coil under the road surface, and it is a new generation of road vehicle detection method by setting up a camera above the road to detect traffic data. The disadvantage is that there is a certain difficulty in the identification of moving vehicles.

On the one hand, it is necessary to have a fast enough shutter (at least 1 3000px) and a sufficient number of pixels and image algorithms to shoot high-speed moving vehicles. On the other hand, at intersections, crossings and highway entrances and exits, the speed of vehicles is generally slow, and the most common violations are running red lights, merging violations and wrong lane selection, etc., these behaviors do not require radar with high-speed cameras, and the use of a slower shutter can achieve the purpose of monitoring. In addition, ** technology is affected by light, weather.

The principle of speed measurement on the highway is so simple, and those who don't understand it can take a look.

There are several types of vehicle detectors:1. Coil type, two sets of induction coils are buried under the road surface.

As the vehicle passes by, the distance between the two sets of coils is divided by the detected time difference to get the vehicle's velocity. 2.The microwave type and the radar type are basically the same.

The detection method tracks the process of illegal vehicle behavior through the analysis of continuous images, and takes pictures through analysis and control to capture the violation. The advantage of this system is that it is not limited by road conditions, and it does not need to destroy the road surface when installing, or bury an induction coil under the road surface, and it is a new generation of road vehicle detection method by setting a camera above the road surface to detect traffic data. The disadvantage is that it is difficult to identify moving vehicles.

On the one hand, when photographing a high-speed car, it is necessary to have a fast shutter speed (at least 1 3000px), a sufficient number of pixels, and an image algorithm. On the other hand, at highway intersections, crossings, and entrances and exits, the speed of vehicles is generally slow, and common violations include running red lights, merging violations, and wrong lane selection. These behaviors do not require radar and high-speed cameras, and can be monitored using a slow shutter speed. In addition, technology is affected by light and weather.

As mentioned above, microwave radar is different from ** detection. Intersections are usually multi-lane and have the complexity of multiple vehicles and pedestrians. It is also very difficult to detect illegal vehicles at intersections using microwave radar with a single Doppler effect.

For high-speed one-way highways, microwave radar is currently the best partner for cooperation with high-speed cameras. After receiving the high-speed vehicle detected by the microwave radar, the high-speed camera quickly enters the state of rapid capture and cooperates with the high-speed shutter to illegally collect evidence. The world's mainstream product is radar with high-speed cameras to shoot overspeed.

Millions of car purchase subsidies.

The principle of high-speed speed measurement and photography can be divided into three types, among which the more classic is the coil type, which requires a large amount of construction of the induction coil buried in the ground. Subsequently, with the development of science and technology, there are empty cars, microwave and radar, as well as first-class analysis software to calculate the speed.

The principle of interval speed measurement is: by taking pictures twice in the speed measurement area, and comparing the time of the two photos, you can judge whether you are speeding.

The interval speed measurement generally adopts the "two-point capture" method: that is, at the first point, if there is a car exceeding the rated speed, a photo will be taken first, and then the second point after one kilometer is also a speed measurement, and the car that exceeds the rated speed at this point will be captured.

If the same car appears at both points, the time is calculated by dividing the preset distance by the time of the two photographs to calculate whether the average speed exceeds the rated speed.

If there is no speeding, it will be automatically eliminated, which is generally calculated by the computer on the automatic recognition of the car version of the auspicious rolling function.

For example, the distance between two speed measurement points on a certain section of Guanghui Expressway is 120 kilometers, and the speed limit of this section is 120 kilometers per hour, if the vehicle takes 1 hour or more to run, then its average speed is less than 120 kilometers per hour, which means that you are not speeding; If you run within 1 hour, you're considered speeding. (Photo by photo:.)

Weilin Yang) @2019

There are two ways to measure speed on the highway.

Radar microwave speed measurement: its principle is to use various frequencies of microwaves to hit your car, according to the reflection time to measure the speed of the car, can be divided into solid liquid celery fixed type and mobile type, mobile is the common hidden in the side of the road mobile speed radar and installed on the police car speed radar, fixed type is generally installed on bridges and intersections, kina tunnels and other dangerous areas. Radar speed measurement is commonly used on highways, national highways, and urban peripheries.

Magnetic-ground induction circle speed measurement: The principle is to bury two pressure sensors on the road surface, and judge the speed according to the time when the front and rear wheels press through the induction blotting device. It is commonly found at traffic lights on national highways and in cities.

This speed measurement point is very easy to identify, it is a telephone pole type, and during driving, you can see the photo spot from a distance by relying on the naked eye, especially at night, and there are very bright searchlights turned on. When you see a pole-style photo spot, just press the brakes and slow down the car.

In conclusion, car owners are advised to follow the traffic rules and not to exceed the speed limit, violating the traffic rules is dangerous. Moreover, once it is photographed, it has to pay a fine, and it is also fined by the traffic police department that has jurisdiction over the speeding section, and the payment cannot be transmitted back to the local area in time, which has an impact on the vehicle inspection and transfer.

About the landlord's concern about "what is the principle of illegal speed measurement and photography?" "Here's my personal opinion:

The principle of illegal speed measurement is to be wide: including concessions.

1. Speed photography and surveillance photography are two different kinds of cameras;

2. Use high-speed and high-sensitivity cameras and flashes to take pictures at high speed. The camera device is equipped with an induction coil (sensor) that automatically flashes when a vehicle enters it.

3. Conventional cameras are used for surveillance and photography, which are only used to observe traffic flow and road conditions. If you are taking surveillance photos, you need to use at least 3 or more photos** to prove speeding.

High-speed speed measurement photography is mainly to take pictures of whether there is a violation of traffic rules, which is both "speeding":

1. The speed camera is used to measure the speed and capture the speeding vehicle. Also commonly known as a bayonet, there will be a black square-shaped radar speedometer next to the camera, which is easy to distinguish;

2. Cameras can be divided into two categories: digital camera inclusions and analog cameras. The digital camera can convert the analog signal generated by the acquisition device into a digital signal, and then store it in the computer;

3. The meniscus captured by the analog camera must be converted into a digital mode through a specific signal capture card, and can be converted to the computer after compression.

Summary. Hello, which cameras on the highway are speed cameras including:1

Violation camera, the role of this camera is generally to capture the violation. For example, in the case of random parking, because in many cases, the illegal parking of cars will occupy the normal activity space of pedestrians and seriously disrupt social order. 2.

Electronic eye. This camera has a similar role to the violation camera, but its performance is more advanced and the range of action is also larger. Generally speaking, the role of the electronic eye is to monitor behaviors such as illegal lane changes and red light running at highway intersections.

3.Flow tachymeter probes. As the name suggests, a mobile speed probe is a camera used to monitor the speed of a moving vehicle.

As we all know, you can't slow down at will on the highway, because once the speed of the vehicle slows down to a certain level, it is easy to have a rear-end accident. 4.Overspeed camera.

The speed camera functions similarly to the mobile speed probe above, monitoring the speed of vehicles on the road.

Hello, which cameras on the highway are speed cameras including:1Violation camera, the role of this camera is generally to capture the violation.

For example, in the case of random parking, because in many cases, the illegal parking of cars will occupy the normal activity space of pedestrians and seriously disrupt social order. 2.Electronic eye.

The function of this camera is similar to that of the illegal camera, but its performance is more advanced and the range of action is larger. Generally speaking, the role of the electronic eye is to monitor behaviors such as illegal lane changes and red light running at highway intersections. 3.

Flow tachymeter probes. As the name suggests, a mobile speed probe is a camera used to monitor the speed of a moving vehicle. As we all know, you can't slow down at will on the highway, because once the speed of the vehicle slows down to a certain level, it is easy to have a rear-end accident.

4.Overspeed camera. The function of this speeding camera is similar to that of the mobile speed probe above, which monitors the speed of vehicles on the road.

Usually, a speed camera looks like a rectangular box. This kind of speed measurement camera, the reason why the vehicle can monitor the driving speed, is actually a radar module connected with a rectangular box, when the radar detects the vehicle speeding, it will touch the land camera to take pictures, using the principle of Doppler effect, when the vehicle is close to the radar antenna, the reflected signal frequency will be higher than the transmitter frequency, and the relative speed of the vehicle and the radar can be calculated by changing the frequency value.