Ultra-low illumination and ultra-wide dynamic camera is a closed-circuit television camera which integrates low illumination and wide dynamic functions. Low illumination can work in extremely weak illumination. Super-wide dynamic technology of closed-circuit television system can work under illumination lower than normal visual response, which is a technology used to make the camera see the image features clearly under very strong contrast. When the high-brightness area is irradiated by a strong light source (sunlight, lights or reflections, etc.). ) and shadow, backlight and other areas with relatively low brightness coexist in the image. The bright areas will turn white due to overexposure, and the dark areas will turn black due to underexposure, which seriously affects the image quality. For the brightest and darker areas in the same scene, the performance of the camera is limited, which is usually called "dynamic range"