The implementation of fast light-adjusting based on PID system

Dynamic target tracking technology has been widely used in airborne fire control systems, airborne warning systems, onboard systems and battlefield surveillance target tracking. The dynamic target tracking technology is used in automatic target detection, identification and positioning to control the movement of the camera. High-sensitivity CCD camera system is widely used in Modern high-speed camera. When the camera is used in the scene that target is too bright and ground is in large variation, the images are easily saturated. The gray of collected images is directly related to the amount of light enter the camera, so the image gray relies on the adjustment of light amount through an optical system. The means of the exposure control focuses on the adjustment of image brightness, and the amount of light through an optical system relies on the integration time to adjust the brightness of the images, in our system, we adjust the integration time to change the image gray. We propose a method for automatically adjusting the gray of image, which takes the image gray as the feedback signal of FID system to adjust the camera´s exposure time. So we can get stable and desirable image gray under high image frame rate in restricted time. In different environment with different illumination, this technology is mainly used in adjusting the image gray to an appropriate value. Furthermore, the tracking camera attaches importance not only on the dimming range but also on the dimming speed. Our algorithm can guarantee a quick adjustment and get a stable and desired image gray.