Linear pushbroom cameras
Linear pushbroom cameras
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DOI：
10.1109/34.615446
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发表时间：
1997-09-01
影响因子：
23.6
通讯作者：
Hartley, RI
中科院分区：
文献类型：
--
作者：
Gupta, R;Hartley, RI
由于轨道卫星相对于旋转地球的运动以及轨道动力学数学模型的非线性，卫星成像中常用的推扫式传感器的建模和分析是困难和计算密集的。本文介绍了一种推扫式传感器的简化模型（线性推扫模型）。与全轨道推扫式模型相比，它具有计算简单的优点，同时又能给出非常准确的结果。除了遥感之外，线性推扫模型在许多其他成像应用中也是有用的。简单的非迭代方法给出解决线性推扫模型的主要标准摄影测量问题：从地面控制点的模型参数的计算;从两幅图像之间的图像对应关系的相对模型参数的确定;和场景重建给定的图像对应关系和地面控制点。线性推扫式模型读取到的理论见解对完整模型也大致有效。线阵推扫式相机的极线几何形状与透视相机的极线几何形状完全不同。然而，矩阵类似于透视相机的基本矩阵示出存在线性推扫传感器。由此可见，一个场景是确定了一个仿射变换从两个视图与线性推扫相机。
Modeling and analyzing pushbroom sensors commonly used in satellite imagery is difficult and computationally intensive due to the motion of an orbiting satellite with respect to the rotating earth, and the nonlinearity of the mathematical model involving orbital dynamics. in this paper, a simplified model of a pushbroom sensor (the linear pushbroom model) is introduced. It has the advantage of computational simplicity while at the same time giving very accurate results compared with the full orbiting pushbroom model. Besides remote sensing, the linear pushbroom model is also useful in many other imaging applications. Simple noniterative methods are given for solving the major standard photogrammetric problems for the linear pushbroom model: computation of the model parameters from ground-control points; determination of relative model parameters from image correspondences between two images; and scene reconstruction given image correspondences and ground-control points. The linear pushbroom model reads to theoretical insights that are approximately valid for the full model as well. The epipolar geometry of linear pushbroom cameras in investigated and shown to be totally different from that of a perspective camera. Nevertheless, a matrix analogous to the fundamental matrix of perspective cameras is shown to exist for linear pushbroom sensors. From this it is shown that a scene is determined up to an affine transformation from two Views with linear pushbroom cameras.