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首页> 外文会议>Conference on Stereoscopic Displays and Applications; 20080128-30; San Jose,CA(US) >Extraction of Digital Elevation Map from Parallel-Perspective Stereo Mosaics
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Extraction of Digital Elevation Map from Parallel-Perspective Stereo Mosaics

机译：从平行透视立体马赛克中提取数字高程图

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摘要

In this paper we present an algorithm to extract the Digital Elevation Map or Model (DEM) of a scene from a pair of parallel-perspective stereo mosaics. Stereo mosaics are built from an aerial video of a scene using parallel ray interpolation technique. In addition to the left and right stereo pair, we also build a mosaic along the nadir view to distinguish between the apparent visible and occluded surfaces. This distinction helps us in fitting vertical planes to the occluded surfaces (in nadir view) and developing a complete CAD model of each object (especially buildings in an urban scene). Buildings and trees are two important classes of objects observed in urban scenes. So, the nadir mosaic is segmented and building/tree regions (segments) are identified and separated from terrain. The edges and corners of different surfaces of a building are identified. We match the control points along these edges to their corresponding points in left and right mosaic. Using the disparity between the corresponding points in the mosaics, an elevation map is developed at these points. Optimal surfaces are fit to each of the segments through the edge points. Parts of a DEM of a scene like buildings extracted from a real airborne video are presented in this paper.
机译：在本文中，我们提出了一种从一对平行透视的立体声镶嵌中提取场景的数字高程图或模型（DEM）的算法。立体马赛克是使用平行射线插值技术从场景的航拍视频中构建的。除了左右立体声对外，我们还沿着天底视图构建一个镶嵌图，以区分可见的可见表面和遮挡的表面。这种区别有助于我们将垂直平面拟合到被遮挡的表面（在最低点视图中），并为每个对象（尤其是城市场景中的建筑物）开发完整的CAD模型。建筑物和树木是在城市场景中观察到的两类重要物体。因此，对最低点马赛克进行了分割，并识别了建筑物/树木区域（片段）并将其与地形分离。确定建筑物不同表面的边缘和角落。我们将沿这些边缘的控制点与左右镶嵌中的相应点进行匹配。利用镶嵌图中相应点之间的视差，在这些点处绘制出高程图。最佳表面通过边缘点适合每个段。本文介绍了场景的DEM部分，例如从真实机载视频中提取的建筑物。

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