On the road to peace teach you how to match monitoring equipment
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Which technologies are the most important?
From the perspective of the demand characteristics of road monitoring, in a complex shooting environment, it is possible to intelligently identify road conditions and respond quickly to illegal phenomena. At the same time, ensuring clear image quality is the basic requirement for road monitoring. Therefore, the requirements of the surveillance cameras for imaging quality are still very high.
Sharpness requirements
Under normal circumstances, because the road surveillance camera is far from the shooting distance, and the vehicle moves quickly, the overall characteristics of the vehicle are not obvious. Therefore, road cameras are generally equipped with high-definition imaging capabilities into their work. From the perspective of the current surveillance camera performance. For the road situation is not very complicated, the 480-line imaging resolution can meet the daily shooting needs, and for the occasion of large traffic volume, the environment is more complex, it is recommended that the relevant departments to use more than 500 levels of surveillance cameras shooting.
In addition, in the choice of imaging chip, most current high-definition network cameras use CMOS chip configuration. Although this imaging chip can achieve higher definition, its night vision effect is much worse than the CCD chip. Therefore, in some places where the light is not very good, it is recommended to use CCD chip cameras.
Sensitivity requirements
The above is a simple explanation of the low illumination, so here we give you a detailed description of camera sensitivity recognition. For a camera, the higher the sensitivity, the lower his minimum illumination. However, it does not mean that the lower the illuminance, the better its night vision imaging. If it exceeds a reasonable range, it will also affect the quality of the image. In addition, when referring to indicators, in addition to the minimum illuminance, the amount of light must not be ignored. Under normal circumstances, the greater the cross-section of the lens through the amount of light, and the greater the number of shots the smaller the amount of light (such as: F1.2 lens than the amount of light transmitted through the F1.4 lens).
Optical aberration adjustment and backlight compensation technology needs
We put these two indicators together, mainly based on their adjustments to the imaging effects under extreme lighting conditions. Due to the angle of view, it is very common for the camera to be directly illuminated by the headlights during night work. This situation can easily cause instantaneous "blindness" of the camera. In this case, it needs wide dynamics, which can still ensure normal imaging in the case of bright backlight, so as to ensure the normal shooting. In addition, the use of light suppression technology is also an effective means to deal with such issues. Although some current cameras also use solar eclipse technology to ensure night-time imaging, this technology is not as ideal as a normal camera in the daytime.
The backlight compensation technology is still able to capture the license plate information and so on while ensuring that the ambient light is dark. This is even more important in a road environment where the illumination is not very good.
In addition, in the current surveillance cameras for traffic applications, there is a strong light shielding technology that covers part of the strong light through software, thereby reducing the overall brightness of the screen and better extracting details such as license plates. However, due to the current smart autonomy of this technology is not very strong. Therefore, whether or not it needs to be determined actually requires actual testing.
Demand for white balance
Based on the current color index of the camera is not very clear features, we need more proofreading and restoration of white balance function in our work. Especially for road surveillance cameras, it is necessary to have a detailed grasp of the color and characteristics of the vehicle. Therefore, the surveillance camera with rich white balance adjustment method will undoubtedly have more obvious help for road monitoring.
In addition, the camera's signal-to-noise ratio is also a major factor in the quality of imaging. However, the camera signal-to-noise ratio that generally meets the above requirements is basically above 48dB-50dB, which can fully meet the needs of road monitoring, so it is no longer emphasized here.
Application classification of cameras under different requirements
Take a snapshot of the camera. Under normal circumstances, speeding and other behaviors occur at night when traffic flows are sparse, and the vehicle is fleeting, so there is a high requirement for the camera's ability to capture at night. In this case, shooting with a double CCD fill camera is usually done.
A camera for snapping down lights. Due to the forensic evidence of such illegal acts, it is mainly the illegal videos and photographing information of the grabbed vehicles. Therefore, surveillance cameras that specialize in vehicle license plates are generally used.
Crossroads and other cameras with multiple angles. In general, the shooting of intersections involves the observation of multiple angles. If you use a fixed-angle camera, it will not only cause dead ends, but it will also increase the cost. In this case, the star camera became the best choice for multi-angle shooting.
The most widely used camera in the field. In our surveillance shooting, the most common is a gun camera. Because this type of camera is easy to control the focal length and angle, it is often used for traffic monitoring. It can be said that it is the road surveillance camera that has played the most role in the illegal shooting of various types of vehicles.
Special Location Monitoring Points to Note
Compared with ordinary urban roads, the characteristics of high-speed road monitoring are still different from urban roads. First of all, because highways are mostly located in remote suburbs or villages. Therefore, the facilities around the expressway are much less than the cities. Therefore, in the selection of high-speed road monitoring equipment, attention should be paid to road illumination. In poorly lit roads, the introduction of night vision capabilities and wide dynamic technologies should be strengthened. In addition, due to the frequent occurrence of rain, snow, or heavy fog on some road sections, the necessary fog camera is also indispensable. Where necessary, monitoring equipment for geological conditions can even be installed to ensure road safety.
Community Road
For the community road monitoring, its complexity is much simpler than the urban road. And although the same as the road monitoring. But its role tends to be more policing and the application of parking management. Therefore, the choice of such surveillance cameras should be more civil security. Unlike cities and high-speed roads that pursue high-tech capture, residential road monitoring can be done with ordinary security cameras with simple infrared support.
As the number of motor vehicles in various places has increased dramatically with Japan, the traffic problem seems to have become an unavoidable pain in people's lives. With the increasing status of surveillance cameras in the traffic management field, for traffic managers, a more reasonable application of surveillance cameras can help us to reduce our pain in life.