一种空间相机快速自动曝光技术

基于CMOS传感器的高集成小型相机在航天器上得到了越来越广泛的应用。空间相机能够完成航天器关键动作记录、对地遥感、近地天体观测等任务，并且具有体积小、重量轻、智能化的特点。为了实现良好的成像效果，适应于空间环境特点的自动曝光技术不可或缺。本文针对空间环境的特殊性及空间任务的不可逆性，提出了一种快速自适应曝光算法。该算法以能量分析为基础，进行目标与背景分离，针对目标进行加权统计，根据图像的统计结果，采用最速查表法，计算获得最佳曝光时间。设置双重目标调整范围，使得自动曝光算法收敛性较好。实验结果表明，该算法能够快速稳定地获得最佳曝光时间，曝光收敛速度快，稳定性高，资源占用少，非常适合空间场景探测。相关算法已成功应用于多个在轨型号。

Automatic exposure technology for space camera

Highly integrated miniature cameras based on CMOS sensors have been used more and more widely inspacecraft. Space camera can accomplish the key operation record, remote sensing and near celestial observationof spacecraft, and has the characteristics of small volume, light weight and intelligent. In order to achieve a goodimaging effect, automatic exposure technology which is suitable for the space environment is indispensable. In thispaper, a fast adaptive exposure algorithm is proposed for the particularity of space environment and the irreversibilityof spatial tasks. The algorithm is based on energy analysis, weighting statistics on the target according to the statistics of the image, and using the lookup table method to calculate the optimal exposure time. The double objectiveadjustment range is set, so that the automatic exposure algorithm converges better. The experimental results showthat the algorithm can obtain the best exposure time quickly and stably. The speed of exposure is fast and the stability is high. It is very suitable for space scene detection. The correlation algorithm has been successfully applied tomultiple on orbit models.