北京三号B卫星相机在轨自动调焦方法  

On-orbit Automatic Focusing Method for BJ-3B Satellite Camera

作　　者：朱志豪 谭伟[1] 唐琦[1] 李恺[1] 冯星泰 蔡浩 张鹏[1] 王芸[1] 胡永力[1] 高凌雁[1] ZHU Zhihao;TAN Wei;TANG Qi;LI Kai;FENG Xingtai;CAI Hao;ZHANG Peng;WANG Yun;HU Yongli;GAO Lingyan(Beijing Institute of Space Machanics&Electricity,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《航天器工程》2023年第3期64-71,共8页Spacecraft Engineering

摘　　要：提出利用面阵凝视成像的方式通过在轨成像电路与综合电子控制单元协同配合完成相机在轨自动调焦的方法。对比自动调焦方法中常用的平均灰度梯度法、点锐度法、平均边缘强度法和平均边缘宽度法4种图像清晰度评价算法,并结合实际应用进行仿真,最终确定基于均值作为阈值的平均灰度梯度法。平均灰度梯度法在连续帧成像的前提下具备较好的单峰性,对运算的资源需求适中,并且具备很高的可靠性。文章提出的在轨自动调焦方法在北京三号B相机中实现应用,在无云的地物丰富场景下能有效完成范围内搜索最佳焦面的工作,可为其他遥感相机的自动调焦提供参考。An on-orbit camera automatic focusing method of using area-array gazing imaging is proposed through the cooperative of imaging circuit and integrated electronics control units.By comparing four image definition evaluation algorithms commonly used in automatic focusing methods,namely mean gray gradient algorithm,point sharpness algorithm,mean edge intensity algorithm and mean width algorithm,conducting simulation in combination with practical applications,the mean gray gradient algorithm can be finally determined.This algorithm has good unimodality under the premise of continuous frame imaging,moderate demand for computing resources and high reliability.The on-orbit automatic focusing method proposed in the paper has been applied in the BJ-3B satellite camera,which can effectively search for the best focal plane within a range in the rich scene of cloudless terrain.It can offer reference for the automatic focusing usage of other remote sensing cameras.

关 键 词：北京三号B卫星相机 在轨自动调焦 凝视成像 清晰度 

分 类 号：TP75[自动化与计算机技术—检测技术与自动化装置]