2.本文分析了自动聚焦的理论依据,提出了实现自动调焦的总体方案和电路设计。根据视频信号在聚焦和散焦两种状态下的不同频率特性,对场间视频信号的高频分量进行检测、加工、处理,由硬件电路或电脑实现彩色摄象机光学镜头聚焦的自动控制,不改动内部线路,做到自动聚焦和手动聚焦兼容。 This paper analyzes the theoretical basis of automatic focusing, and proposes the overall scheme and circuit design to realize automatic focusing. According to the different frequency characteristics of the video signal under the condition of focusing and defocusing, the high frequency component of the video signal in the field is detected, processed and processed, the automatic control of the focus of the color camera optical lens by the hardware circuit or the computer, Do not change the internal lines, so auto focus and manual focus compatible.