Several important technical indexes of the hottest

Several important technical indicators of color to black camera

(1) sharpness

sharpness is the most important indicator of a color to black camera. In the monitoring system, there are high requirements for the sharpness of images. For example, in traffic monitoring, vehicles should be able to see the license plate number and pedestrians should be able to see the facial features. If these are not clear, monitoring will lose its significance. The number of lines determines the sharpness. The higher the number of lines, the clearer the image will be. It has something to do with the slogan "CCD chip and size are also guaranteed". High speed spherical color to black camera must reach 480 line definition to meet the requirements. In ordinary shopping malls, hotels, schools, etc., the definition of 420 lines can meet the requirements

(2) minimum illumination

the minimum illumination of the color to black camera refers to that when the brightness of the photographed object decreases to a certain extent, the video signal output by the color to black camera can still be clearly visible. If it is outdoors, it needs 24-hour monitoring. At night, the light is very dark, and the minimum illumination of the color to black camera is usually required to reach 0.01LUX. For example, in traffic monitoring. At present, to solve the problem of low illumination of the camera, we mainly use the super sensitive CCD (i.e. exviewhadccd), which receives more light than the ordinary CCD, so that the object can still be clearly imaged in very dark light

(3) wide dynamic function

when the light changes greatly, and the foreground and background and their light contrast are also large (such as traffic monitoring), in order to capture high-quality pictures, color to black cameras need to have wide dynamic function. When the foreground object is dark and the background is bright, the captured object image is very dark and can't be seen clearly. At present, the solution of color to black camera in the market is to use backlight compensation (BLC), but because backlight compensation uses central light compensation technology to process the image, the image processed by backlight compensation technology can be seen clearly because of light compensation, but the background can't be seen clearly because of light compensation. If you need to see the foreground object and background at the same time, you need to use the color to black camera with wide dynamic function ◆ 2 Purpose and significance of developing bio based high molecular materials. Wide dynamic technology is to synthesize an image with clear and bright foreground object and background through internal processing circuit after two exposures of the image. Generally, the dynamic range of wide dynamic color to black camera can reach 80 times. At present, the high-speed spherical color to black camera has this function

(4) convenience of installation, commissioning and maintenance

the simplicity of structural design and the convenient installation, commissioning and maintenance of color to black camera are also important for the installation company and users that engineering color is an important part of marketing means. In the installation and commissioning stage, a lot of time and energy can be saved to facilitate the installation of engineering companies; For users, simple and timely product maintenance is undoubtedly the guarantee for the normal operation of the monitoring system

among the above indicators, clarity and minimum illumination are the primary considerations. At present, the wide dynamic function is not available for all color to black cameras, but only a few

we also have a distance problem in the monitoring system engineering. The monitoring distance is related to the focal length of the lens. The larger the focal length of the lens, the longer the viewing distance, but the viewing range will be smaller. For example, if you only need to see 10 meters, use 3 It also needs a 6mm lens. 3.6mm is a wide-angle lens, and the viewing range should be wider. If you want to see 100 meters, the 3.6m lens obviously can't meet the requirements. You should use a 25mm lens. The scope of view should be smaller. Of course, how much focal length to choose depends on the distance to be monitored. If the focal length is larger, the corresponding image range is smaller than that of a small focal length. (end)