一种高分七号卫星影像的分块核线影像生成方法  

A block epipolar image production method for GF-7 satellite image

作　　者：巩丹超[1,2] 席英 GONG Danchao;XI Ying(Xi'an Research Institute of Surveying and Mapping,Xi'an 710054,China;State Key Laboratory of Geo-Information Engineering,Xi'an 710054,China;Unit 61175,Nanjing 210049,China)

机构地区：[1]西安测绘研究所,陕西西安710054 [2]地理信息工程国家重点实验室,陕西西安710054 [3]61175部队,江苏南京210049

出　　处：《测绘科学与工程》2021年第3期20-24,共5页Geomatics Science and Engineering

摘　　要：由于线阵光学卫星影像通常采用投影轨迹法来生成近似核线影像,因此,这种近似会随着影像像幅范围的增大而使核线影像出现较大的上下视差,从而影响后续影像匹配的精度。本文针对高分七号光学卫星影像像幅大的特点,设计了一种基于分块核线影像的生成方法。试验结果表明,分块核线影像同名点的上下视差能够达到子像素的精度要求。该方法不仅能够满足高分七号卫星高精度核线影像的生成,而且通过分块也便于后续的影像并行处理。When processing images of linear array optical satellite,the projection trajectory method is generally used to gen-erateapproximate epipolar image,which will cause a larger parallax of the epipolar image as the image range increases,and then affect the accuracy of subsequent image matching.In this paper,a method to produce block epipolar image is proposed for high resolution image of GF-7 with larger size.The experimental results show that the parallax of the same point in block epipolar image can achieve sub-pixel accuracy,which proves that the method can meet the requirements of producing high precision epipolar image of GF-7,and it is convenient for the subsequent parallel processing of block images.

关 键 词：高分七号 核线 影像匹配 投影轨迹法 有理函数模型 

分 类 号：P208[天文地球—地图制图学与地理信息工程]