遥感相机的智能调焦方法

Intelligent focusing method for the remote sensing cameras

为了将基于图像处理的智能调焦方法引入到空间遥感相机中,从而提高其在轨调焦能力,提出了采用辅助CCD的遥感相机智能调焦方法。该方法解决了推扫式遥感相机由于图像动态变化导致的比较基准不确定问题,为智能调焦方法在遥感相机中的应用开创了途径。在阐述基本调焦原理的基础上,给出了实际应用中多片CCD级联时评价区域选择依据和算法,并以Variance函数为评价函数对调焦过程进行了仿真模拟,实验结果表明:该方法能够可靠、自动地搜索到最佳聚焦位置,获取清晰图像,适用于遥感相机使用。

In order to make use of intelligent focusing methods based on image processing m remote sensing camera and improve its focusing ability, an intelligent focusing method was proposed based on accessorial CCDs. This method solved the problem that the base of comparison was uncertain due to images changing. It created a way for intelligent focusing methods to come in the field of remote sensing cameras. On the basis of expatiating focusing principle, selecting principle and algorithm for multi-chip CCDs were given. Then a simulation of auto-focusing using Variance as the focus measure was carried out. The results show that the proposed focusing method based on auxiliary CCD can automatically and reliably search for and get to the best focus position, and obtain clear images, is suitable for remote sensing cameras accordingly.