摘要
提出基于图像处理技术的航空相机镜头焦面定位的方法,利用光电自准直原理进行焦面定位,并选用两种图像清晰度评价函数实时提取图像清晰度特征,采用优化的爬山算法进行快速检焦。仿真实验结果表明:利用本系统对焦距为750mm,F数为6.3,CCD像元尺寸为6.8μm×6.8μm,成像光谱为500nm～800nm的航空相机进行焦面定位精度测定,得到相机的半焦深为0.040mm,可用于航空CCD相机的焦面检定及航空CCD相机的自动调焦系统。
A measuring method of aerial camera lens＇ focus plane is presented, which locates fo- cus plane using autocollimation theory. The system chooses two kinds of image definition eval- uation function to extract the characteristics of image definition, and detects focus plane quick- ly using hill-climbing algorithm. Simulation experiment result proves that measuring and cali- brating the focus plane of aerial camera using the autocollimation measuring system is charac- terized by high precision, high speed and good real-time performance, and has little influence by the artificial factors. The system is adapted for the focus plane calibration and auto-focusing system of aerial CCD camera.
出处
《应用光学》
CAS
CSCD
北大核心
2012年第2期288-292,共5页
Journal of Applied Optics
关键词
航空相机
自准直
图像处理
爬山算法
aerial camera
autocollimation
image processing technology
hill-climbing algorithm
