The road surveillance camera should clearly photograph the license plate at night. On the one hand, it requires the camera to have a strong light suppression index, which can effectively suppress the oncoming glare, so that the license plate is captured more clearly, and the picture is true and complete; on the other hand, the object is required to be carried out. Fill light. The quality of a backlight compensation technology is directly related to whether the license plate can be clearly seen, and whether the back-end video detection and analysis system can give correct judgment results. The clarity of the photo depends on the choice of surveillance camera with backlight compensation, and the addition of a led fill light fixture. In addition to the light emitted by the vehicle itself (the light is harmful to the camera), the outdoor vehicle is the light of the environment itself. The ambient light is scattered on the vehicle and the light of the camera is very small. This requires the addition of led light fixtures. To increase the brightness of the illuminated object to meet the camera's requirements for light. The market mainstream intelligent traffic integrators have more illuminance requirements for LED fill light fixtures. There is no uniform standard, and it is required to illuminate objects at around 20 meters. It can be roughly divided into two categories: one with a distance of 17 meters to 20 meters and a required illumination of 100 Lux; the other is a distance of 20 meters to 23 meters, and the illumination requirement is 200 Lux. In the case of a single lane, when the lamp is at a height of 6 meters, a distance of 20 meters, and a lane width of 3.5 meters, the actual required light angle is 9.58 degrees. In the case of two lanes, that is, the height of 6 meters, the distance of 20 meters, and the double lane width of 7 meters, the actual demand light angle is 19 degrees. These two schemes can be designed with a combination of reflective bowls and lenses, using the advantages of small angle concentrating in the reflective bowl, and the distribution of light by the lens to achieve maximum light efficiency, and at the same time achieve uniform illumination within the required range. The best results. Editor: Liu Hai Car Audio Harness,Stereo Wiring Harness,Car Stereo Wiring Harness,Car Stereo Wiring Dong guan Sum Wai Electronic Co,. Ltd. , https://www.sw-cables.com