一种适合降落序列影像的相对定向方法  

A Relative Orientation Method for Landing Sequence Images

作　　者：纪洋[1] JI Yang(Tianjin Railway Technical and Vocational College,Tianjin 300240,Chin)

机构地区：[1]天津铁道职业技术学院,天津300240

出　　处：《测绘通报》2018年第7期92-96,共5页Bulletin of Surveying and Mapping

基　　金：国家自然科学青年基金(41601494)

摘　　要：针对传统相对定向方法不适用于降落序列影像的问题,提出了一种适合基线与相机主光轴方向一致的降落序列影像相对定向方法。首先,根据降落影像拍摄的几何模型,确定相对定向元素BX、BY、BZ、κ,组成新的相对定向求解模型,然后基于SIFT特征匹配点形成的匹配线段,计算两幅图像的尺度变化,将两幅影像的尺度统一,并根据匹配点坐标变化计算4个相对定向元素的初值,最终通过最小二乘迭代完成相对定向过程。采用了地面模拟试验和嫦娥三号降落影像进行了试验,结果表明,本文的方法能够较好地完成降落序列影像的相对定向,并且具有较好的精度和可靠性。According to the problem that traditional relative orientation method is not suitable for the landing sequence images,a relative orientation method suitable for the the landing sequence images is proposed,when the baseline and the camera optical axis is consistent.Firstly,according to the geometric model of the landing images,the relative orientation elements are determined,and a new relative directional solution model is constructed.Then,the scale changes of the two images are calculated based on the matching line formed by the SIFT feature matching points,and the scale of the two images is unified.After that the initial values of 4 relative directional elements are calculated according to the coordinate change of the matching points.Finally,the relative orientation process is completed by least square iteration.Experiments were carried out using ground simulated images and Chang＇e three landing images. The results show that the proposed method can better achieve the relative orientation of the landing sequence image,and has better accuracy and reliability.

关 键 词：深空探测 降落相机 序列影像 垂直基线 相对定向 

分 类 号：P23[天文地球—摄影测量与遥感]