Monitor the brightness of the camera
[Abstract] Shaanxi UETX:
In the design of monitoring system, monitoring camera brightness is where we consider, the light of the existing lighting conditions usually requires additional compensation, may need to Zo bright and dim, add contrast or hybrid light source is used, where light conditions are complex to adjust the light is more challenging.
Company video and transmission department head KostasMellos said, although the speed of the development of a million pixels camera is very fast, but the analog camera in the light of the performance of the system is better. Raytec marketing director DavidLambert said webcam need light in order to protect the nighttime show high performance of image, and reduce the transmission bandwidth and storage requirements, also can ensure faster frame rate. The appropriate light can significantly reduce the image noise, enhance the efficiency of video compression and transmission.
Each camera has a different light requirements. Lamber for example, such as the use of infrared light for video surveillance, and the front end of the detection device to detect potential hazards, the use of marine grade lighting and so on are possible.
Lamber said many projects because of the need for security and monitoring, the use of traditional street lighting, making the camera to capture the color picture, however, practical lighting scheme can greatly improve the effect of video surveillance system.
Factors to be considered in design
Lamber said, in the infrared and white light conditions in the video surveillance, camera from the vertical projection surface monitoring, and this will require more direct consideration: distance and angle, the general one kilometer has two lighting units, from the angle of 10 degrees to 120 degrees.
Under normal lighting conditions, according to Lamber, it is usually to consider the following points:
1, purpose / application is what? Usually identifies the direction of the direction, the installation height, etc.. For example, in a large park, a long and narrow road or aesthetic architectural decoration, etc..
2, customer or application standards have no specific lighting requirements, consider the matter, including the average light, minimum illumination, consistency (minimum VS average), diversity (minimum VS maximum), as well as horizontal or vertical
3, there are other scenarios to set the size of the no? There is no scene setting plan to install height is critical, obstacles, tree barrier or wall and other information is also very important. Is the light in the light of the existing light body?
Choice
Identification of the best lighting conditions suitable for project requirements is very important. Mainly to measure distance, angle, the maximum energy consumption, input power, maintenance elements, color reduction, security, ease of installation and technical support. Suppliers may help security experts choose products that best meet the requirements of distance and angle.
ALPR application is also very special for the requirements of light. "A license plate automatic recognition camera usually has a shutter setting, such as 1/1000 seconds, to avoid a clear picture of the movement," Lambert said. "So that the light from the image sensor is 20 times less than the traditional shutter speed, such as 1/50." Automatic license plate recognition camera requires additional light to optimize the performance of night and cloudy day.
The pulse illumination system can make the LED transmit two to three times the ordinary illumination. As the camera shutter is not sustained in the open state, it can reduce the average temperature, so as to extend the operating life of the pulse LED. This paper is provided by Shaanxi Electric Communication Technology Co., ltd.. For more information, please visit: http://www.uetx.cc/