一种基于图像清晰度函数的调焦机构限区间变速控制方法  

Method of variable speed control for focusing mechanism limited interval based on image definition function

作　　者：张怀利 李迎春 张廷华 ZHANG Huaili;LI Yingchun;ZHANG Tinghua(Department of Electronic and Optical Engineering,Space Engineering University,Beijing 101416,China)

机构地区：[1]航天工程大学电子与光学工程系,北京101416

出　　处：《应用光学》2021年第6期969-974,共6页Journal of Applied Optics

基　　金：军队科研试验技术研究项目(421414322)。

摘　　要：针对自动聚焦耗时长的问题,通过对调焦过程中图像清晰度的变化规律进行分析,在调焦范围内确定了有效区间,根据清晰度变化斜率调整驱动速率,改进并实现了一种调焦机构限区间变速控制方法。与常规的控制方法相比,本文方法具有行程短、速度快和精度高的优点。实测结果表明,该方法最短聚焦时间小于1.5 s,可以作为同类光学镜头通用的自动调焦控制方法。Aiming at the problem of long time-consumption for automatic focus,by analyzing the change rule of image definition during the focusing process,the effective interval was determined within the focusing range.The drive rate was adjusted according to the slope of the definition change,so that a variable speed control method for focusing mechanism limited interval was improved and realized.Compared with the conventional control methods,the proposed method has the advantages of short stroke,fast speed and high precision.The experimental results show that the shortest focus time of the proposed method is less than 1.5 s,which can be used as a common automatic focus control method for similar optical lenses.

关 键 词：自动聚焦 变速控制 区间搜索 清晰度函数 光学成像 

分 类 号：TN206[电子电信—物理电子学]