important traffic crossing the regional real-time traffic conditions, image monitoring system plan, a set of intelligent road monitoring system installed in city traffic crossing the road traffic conditions in real-time image transmission channel uploaded to the road monitoring command center, which center staff on duty to keep abreast of the regional road conditions, each intersection in order to adjust the traffic flow to ensure smooth traffic. Monitoring illegal road vehicles can be found and arrangements for dealing with road traffic things. Running red lights, or reverse drive, as long as the motor vehicle through a major urban intersection in violation of the People's Republic of China on Road Traffic Safety Law "will be recorded by electronic police and video surveillance equipment, illegal vehicles in the control center of the public security traffic control be printed. The use of high-tech to manage traffic, improve work efficiency, but also convenient for the driver.

To sum up the main role of the urban road monitoring system has the following two points:

1, real-time traffic monitoring: each intersection of the camera will keep the real-time image of the regional monitoring returns the traffic command center, so that the traffic control personnel real-time visibility at road junctions and traffic conditions, such as: sections of traffic flow, traffic lights are working properly whether there are violations and traffic accidents. This information can help the traffic management department to take timely and appropriate treatment.

2, real-time video: video surveillance images are saved to the traffic command center on the video server, as a deal with accidents, violations, and even the evidentiary basis for a variety of emergency situations such as law and order criminal.

Road requirements and selection of video surveillance cameras
Road monitoring around the clock monitoring, so the front of the camera is relatively high, requiring the camera can clearly supervisor to see on the roads of the vehicle license, vehicle type, color, etc..

Road monitoring video system compared to the human visual system, then the camera video system like the human eye, and its importance is self-evident, so the traffic monitoring camera selection requirements are very demanding.

Traffic and road surveillance cameras to choose first to consider the following two requirements:

Performance: Camera performance is directly related to whether the shooting in a variety of conditions, a clear picture Can you see the license plate at night, shoot the image is true color;

Reliability: the camera to be able to long-term in the harsh environment of stable work to ensure that image quality does not deteriorate, low failure rate. If a traffic monitoring system "eyes" is not good or often failed and even other parts of the system perfect, the defects of the entire system is clear.

Most traffic surveillance cameras fixed lens cameras, these cameras should be concerned about the selection and application of the following main technical parameters and functionality:

1, camera resolution, image horizontal resolution greater than 500 lines, and then configure the high-definition monitor, there will be a better monitor. Greater than 500 lines of horizontal resolution camera than the 480-line camera imaging results to be more clear and sharp. Therefore, the higher the resolution, the better performance of the camera.

2, the camera sensitivity, minimum illumination indicators can not just look at how many of the previous figures, but should look at this indicator is measured under what conditions. Such as color most to illumination 0.15Lux/F1.4/50IRE/AGCON, and 0.15Lux low light lens of F1.4 through the amount of light, the video signal measurement level in 50IRE (350mv), measured AGCON conditions. Change through the light volume of the F1.0 lens, the video signal measurement level 25IRE lower to detect low light indicators. 1/2 inch CCD camera sensitivity and image quality is better than 1/3 inch CCD camera.

3, the camera signal to noise ratio. In good light, the camera signal to noise ratio is very good, the image point of view, no noise point, but in low light when camera images are still clear signal to noise ratio indicators of good, less noise point. Poor signal to noise ratio indicators camera, the noise will submerge the entire image.

4, the camera light suppression, road surveillance cameras to take clear pictures at night, the vehicle license, which requires light inhibition index better. Camera using this technology, can effectively inhibit the light face of the vehicle (Vehicle light), the vehicle license more clearly captured the picture is a true and complete. Eclipse technology a lot of road surveillance cameras, license plate good shot at night, but often the "eclipse" in the daytime, which affects the overall image appearance and integrity.

5, camera backlight compensation function, the camera at night shooting the license plate, backlight compensation technology is good or bad, is directly related to clearly see the license plate, whether the back-end video detection and analysis system to give the right to judge results. A good camera can be flexibly set for backlight compensation area and region selection.

6, the camera color restore performance, the camera does not have a specific color index, can only make colors true to the color adjustment and white balance adjustment. Different types of camera color reduction performance is different, this indicator is only through debugging and site true colors to compare. Can select the white balance adjustment means more cameras, such as: manual white balance adjustment mode, white balance, automatic tracking adjustment mode, indoor models, outdoor models.

7, camera digital noise reduction technology, in a dark environment, due to the illumination of the camera noise will inevitably increase, you can use a unique digital noise reduction technology. Make images clearer and pleasing to the eye under low light conditions.

Digital noise reduction technology is a professional video signal processing technology, the DSP chip by the image information in the detection and analysis of frame memory, automatically reduces the gain margin of a relatively static picture, eliminate interference noise in the signal, thereby effectively improving the picture clarity and cleanliness.

Camera debugging convenience, the camera in addition to the quality and reliable, but also to facilitate the installation and commissioning. The road most of the surveillance cameras installed in the 9-15 meter-high column on the installation and removal require special tools to vehicles, is a dangerous high-altitude operations, if the quality is not reliable or debugging inconvenient, it is bound to bring great cost of construction and engineering and affect the normal use.

Can use the camera's RS-485 port of the camera settings and debugging. Significant savings in manpower and debugging time; this fast and convenient port, this port can remotely control the camera, modifying the parameters of the camera inside, without having to visit the site to adjust the camera. There are a lot of cameras with this interface.