一种上下视差最小的线阵影像核线确定方法  

A Method of Obtaining Epipolar Lines with Minimum Vertical Parallax for Linear Imagery

作　　者：段尚琪 余俊鹏 沈刚 黄双得 葛兴科 周仿荣 DUAN Shangqi;YU Junpeng;SHEN Gang;HUANG Shuangde;GE Xingke;ZHOU Fangrong(Kunming Power Supply Bureau of Yunnan Power Grid Co.,Ltd.Kunming 650011,China;School of Civil and Traffic Engineering,Guangdong University of Technology,Guangzhou 510006,China;Electric Power Research Institute,Yunnan Power Grid Company Ltd.,Kunming 650217,China)

机构地区：[1]云南电网有限责任公司昆明供电局,昆明650011 [2]广东工业大学土木与交通工程学院,广州510006 [3]云南电网有限责任公司电力科学研究院,昆明650217

出　　处：《航天返回与遥感》2021年第4期74-82,共9页Spacecraft Recovery & Remote Sensing

基　　金：基于卫星技术的电网“天空地协同”巡视及风险防控策略研究与示范应用(YNKJXM20180016);国家自然科学基金(41704019)。

摘　　要：建立核线约束是保证立体影像匹配准确性和可靠性的重要条件。由于线阵影像的多中心投影性质,难以对其建立严格的核线模型。文章在假定线阵影像局部范围内核线为直线前提下,提出一种基于RFM模型的同名核线求取方法。首先通过RFM生成的立体影像同名点直线拟合度测试获取核线倾角初值,再以抛物线拟合法精确求出核线倾角,从而得到具有最小上下视差的核线方程。根据ZY-3、Pleiades、SPOT-5、QuickBird等卫星线阵立体影像的试验结果得出:该方法所求核线对在5000像元×5000像元范围内上下视差中误差最大不超过0.6像元,核线精度明显优于投影轨迹法结果。不同影像核线倾角变化呈现不同规律:ZY-3卫星的影像核线几近平行,而SPOT-5和QuickBird卫星的影像核线倾角变化率较大。该结论将为构建线阵影像的核线平差模型提供参考。Establishing the epipolar geometry constraint is an important condition to realize stereo image matching accuracy and reliability.Due to the multi-center projection properties of the line array image,it is difficult to establish a strict epipolar geometry model.This paper proposes a method of obtaining epipolar lines based on RFM.First,the initial value of the epipolar line inclination is obtained through the collinearity test of the corresponding image points generated by RFM,and then the accurate line inclination is computed using the parabolic fitting method,and the epipolar line equation with minimum vertical parallax is obtained.The test results of linear stereo images such as ZY-3,Pleiades,SPOT-5 and Quickbird show the RMSE of vertical parallax in 5000×5000 pixels is not more than 0.6 pixels,better than the results of the projection track method.Epipolar lines of different images show diverse trends,almost parallel for the ZY-3 but having obvious inclination changes for SPOT-5 or Quickbird.The relevant conclusions may provide a reference for designing the adjustment model of epipolar geometry.

关 键 词：线阵影像 摄影测量 核线 上下视差 遥感应用 

分 类 号：P237[天文地球—摄影测量与遥感]