Visibility的航空遥感相机自动焦面检测方法

为了解决航空遥感相机自动焦面检测的问题，提出了一种利用空间滤波测速（SFV）原理进行航空遥感相机自动焦面检测的方法。首先，在焦面检测过程中，采集线阵CCD输出图像的Visibility值，利用SFV信号的Visibility值与离焦量之间的关系，通过搜寻SFV信号Visibility最大值找出最佳的成像焦面位置；其次，对空间滤波测速原理及Visibility与离焦量的关系进行了介绍；最后，对设计的实验装置在5~53.2 mm/s的典型像移速度下进行了20次焦面检测，结果表明最大测量误差均方值为46.25m，小于航空遥感相机光学系统的检焦误差宽容度（76.8m），能够满足航空遥感相机的自动焦面检测精度要求。

Automatic focus plane detection of aerial remote camera based on Visibility

In order to solve the problem of automatic focus plane detection in aerial remote camera, a new method of automatic focus plane detection for aerial remote camera used Visibility based on SFV technique was proposed. Firstly, in the process of focusing, spatial filtering characteristic of spatial slits was simulated by doing interval sample with linear CCD image, the best focus position was found by searching maxim Visibility value of SFV signal, through used relationship between SFV signal and the Visibility value. Secondly, spatial filtering velocimetry and relationship of Visibility and defocusing error was introduced, and experiment setup was designed. Lastly, for the typical image motion velocity between 5 mm/s to 53.2 mm/s, 20 times focal plane detection tests were taken, and the experiment results show that the focusing accuracy was higher than 46.25m, which was within the tolerant defocus(76.8m) and satisfies requirement of aerial remote camera.