基于USB Video Camera的自动对焦系统  

An Automatic Focusing System Based on USB Video Camera

作　　者：王立强[1] 林斌[1] 徐向东[1] 陆祖康[1] 

机构地区：[1]浙江大学国家光学仪器工程技术研究中心,浙江杭州310027

出　　处：《光电工程》2001年第5期32-34,共3页Opto-Electronic Engineering

基　　金：国家九五重点科技攻关项目(96-B11-03-01-04)资助。

摘　　要：介绍一种应用于USB video camera中的自动对焦系统。由USB video camera获取的视频图像经计算机进行FFT运算或微分运算,得到其频谱幅值数据或微分幅值数据,计算机根据所得数据判断USB video camera中的镜头是否处于离焦位置并控制电机将镜头移到对焦位置。文章还进一步讨论了提高自动对焦准确度的措施。实验结果表明该自动对焦系统能很好地实现USB video camera的自动对焦,该系统将使具有USB接口的video camera使用更简单方便。An automatic focusing system applied in USB video camera is introduced. The computer calculates the video image achieved by USB video camera through FFT operation or differential operation, obtains its frequency data or differential data. The computer judges whether the lens of USB video camera is in defocusing position and moves the lens to the focusing position with a motor. The paper further discusses the measures for improving automatic focusing accuracy. The experimental results show that the automatic focusing has been carried out in a very good approach. The system will make the use of video camera with USB interface to be simpler and more convenient.

关 键 词：计算机外设 自动对焦 图像处理 视频摄像机 USB接口 

分 类 号：TP334.2[自动化与计算机技术—计算机系统结构]