Epipolar resampling of space-borne linear array scanner scenes using parallel projection
Epipolar resampling of space-borne linear array scanner scenes using parallel projection
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DOI：
10.14358/pers.72.11.1255
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发表时间：
2006-11-01
影响因子：
1.3
通讯作者：
Habib, Ayman
中科院分区：
文献类型：
--
作者：
Morgan, Michel;Kim, Kyung-Ok;Habib, Ayman
核线重建的目的是生成归一化图像，其中共枕点位于沿着同一行。这种特性使得归一化图像对于许多应用非常重要，例如自动图像匹配、空中三角测量、DEM和正射照片生成以及立体观察。传统上，用于归一化过程的输入媒体是由帧相机捕获的数字图像。这些图像可以通过扫描模拟照片或直接由数码相机捕获来获得。与模拟相机相比，当前的数字帧相机提供更小格式的图像。在这方面，线性阵列扫描仪正在成为二维数字帧相机的可行替代品。然而，线性阵列扫描仪具有比帧相机更复杂的成像几何形状。通常，线性阵列扫描仪的成像几何结构产生非直的核线。此外，根据严格的模型，忠实地描述了成像过程中，所捕获的场景的核线resstriation，需要的内部和外部传感器的特性，以及一个数字高程模型（DEM）的对象空间的知识。最近，平行投影已经成为一种替代模型，近似的成像几何形状的高海拔扫描仪与窄角视场。与严格模型相比，平行投影模型不需要成像系统的内部或外部特性，并且产生直的核线。为了更好地对线阵扫描器进行建模，本文对平行投影方程进行了修正。然后，根据对极几何的修改后的平行投影模型的线阵扫描仪场景进行重采样。使用Ikonos和SPOT数据的实验结果表明，所提出的方法的可行性。
Epipolar resampling aims at generating normalized images where conjugate points are located along the same row. Such a characteristic makes normalized imagery important for many applications such as automatic image matching, aerial triangulation, DEM and ortho-photo generation, and stereo-viewing. Traditionally, the input media for the normalization process are digital images captured by frame cameras. These images could be either derived by scanning analog photographs or directly captured by digital cameras. Current digital frame cameras provide smaller format imagery compared to those of analog cameras. In this regard, linear array scanners are emerging as a viable substitute to two-dimensional digital frame cameras. However, linear array scanners have more complex imaging geometry than that of frame cameras. In general, the imaging geometry of linear array scanners produces non-straight epipolar lines. Moreover, epipolar resampling of captured scenes according to the rigorous model, which faithfully describes the imaging process, requires the knowledge of the internal and external sensor characteristics as well as a Digital Elevation Model (DEM) of the object space. Recently, parallel projection has emerged as an alternative model approximating the imaging geometry of high altitude scanners with narrow angular field of view. In contrast to the rigorous model, the parallel projection model does not require the internal or the external characteristics of the imaging system and produces straight epipolar lines. In this paper, the parallel projection equations are modified for better modeling of linear array scanners. The modified parallel projection model is then used to resample linear array scanner scenes according to epipolar geometry. Experimental results using Ikonos and SPOT data demonstrate the feasibility of the proposed methodology.