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基于光学自准直的航空相机自动调焦系统
引用本文:许兆林,赵育良,张玉叶.基于光学自准直的航空相机自动调焦系统[J].光学仪器,2011,33(2):52-56.
作者姓名:许兆林  赵育良  张玉叶
作者单位:海军航空工程学院青岛分院,山东,青岛,266041
摘    要:分析了摄影环境的大气压力和温度的变化对航空相机离焦的影响,介绍了基于光学自准直的自动调焦系统的硬件电路原理和软件流程设计.基于光学自准直的检焦技术,选用两种图像清晰度评价函数,运用爬山搜索法采用变步长进行检焦控制,不仅有效地节省了检焦时图像处理的时间,而且提高了检焦的精度.通过引入高度和摄影角度数据,进行离焦量计算,通...

关 键 词:航空相机  离焦  自动调焦  自准直  图像清晰度评价函数
收稿时间:2010/8/25

Autofocusing system based on optical autocollimating for aerial camera
XU Zhaolin,ZHAO Yuliang and ZHANG Yuye.Autofocusing system based on optical autocollimating for aerial camera[J].Optical Instruments,2011,33(2):52-56.
Authors:XU Zhaolin  ZHAO Yuliang and ZHANG Yuye
Affiliation:(Qingdao Branch,Naval Aeronautical Engineering Institute,Qingdao 266041,China)
Abstract:For the out of focus in aerial camera caused by the changes of atmospheric pressure and temperature during aerial photograph is analyzed. The principle of hardware theoretic electric circuit and the software design of autofocusing system based on optical autocollimating are introduced. The autofocusing method based on optical autocollimating choosed step length changing control by employing the hill-climbing algorithm with two image definition criterion function, which not only reduces the load for data processing, but also enhances the accuracy of focusing. By receiving the data of altitude and photographic angle to calculate out of focus, the system can adjust the CCD position to realize autofocusing by controlling a driving circuit. The conclusion of the optical measurement and flight indicates that the system meets the requirements of the accuracy of focusing of aerial camera.
Keywords:aerial camera  out of focus  autofocusing  autocollimating  image definition criterion function
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