定标法大面阵航空影像相对辐射校正  

Relative radiation correction of the digital large format aerial camera based on the calibration method

作　　者：张硕[1] 方勇[2,3] 楼乐乐 ZHANG Shuo;FANG Yong;LOU Lele(Chang^n University,Xi'an 710061,China;Xi'an Research Institute of Surveying and Mapping,Xi'an 710054,China;State Key Laboratory of Geo-Information Engineering,Xi'an 710054,China;Unit 61363,Beijing 100072,China)

机构地区：[1]长安大学,陕西西安710061 [2]西安测绘研究所,陕西西安710054 [3]地理信息工程国家重点实验室,陕西西安710054 [4]61363部队,北京100072

出　　处：《测绘科学与工程》2020年第6期52-59,共8页Geomatics Science and Engineering

摘　　要：针对新一代大面阵航测相机DMZH,分析辐射误差产生的各种因素,通过研究辐射误差能量分布,提出了一种基于定标法的相对辐射校正方法。首先通过采集不同曝光时间以及辐射亮度积分球数据,中值滤波后采取定标法逐像素进行校正因子曲线函数拟合,从而构建出逐像素辐射校正模型;其次利用该模型对机载影像进行辐射校正;最后进行整体匀光匀色处理。实验证明,该方法能够有效消除大面阵航测相机影像的辐射不均匀现象,对于实际航空影像辐射校正具有良好适应性。In this paper,several causes for the radiation error o£the new generation o£large format aerial camera are analyzed,and a new way of radiation correction based on the calibration method is proposed by analyzing the energy distribution of radiation error.A pixel-by-pixel radiation correction model is constructed by collecting the sphere data of different exposure times and radiances and fitting the function of the correction factor curve pixel-by-pixel using the calibration method.Then the model is used to conduct the radiation correction of the airborne image,and finally the overall radiation adjustment processing is carried on.The experimental results show that this method can effectively eliminate the radiation unevenness of images taken by the large format aerial camera,and be adaptable to actual aerial image radiation correction.

关 键 词：航测相机 航空 相对辐射定标 校正因子 相对辐射校正 匀光匀色 

分 类 号：P208[天文地球—地图制图学与地理信息工程]