A VIRTUAL SIMULATOR FOR PHOTOGRAMMETRY
A VIRTUAL SIMULATOR FOR PHOTOGRAMMETRY
复制标题
摄影测量虚拟模拟器
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
J. L. Lerma
中科院分区：
文献类型：
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作者：
E. Piatti;J. L. Lerma
本文展示了利用从数字表面模型中获得的合成图像来优化，一方面，摄影测量规划，另一方面，计算机动画。在定义一个具有已知内部方向参数的虚拟（或真实）摄影测量相机后，在一个摄影测量模拟器中生成合成图像，该模拟器将3D模型投射到图像上。当合成图像被拍摄时，外部方向参数被保存。三维模型采用简单的自定义元数据格式设计，能够识别存储在库中的三维实体。每个实体都是空间地理参考，可以与任何其他实体组合以生成复杂的结构。当将3D模型投影到一组图像时，模拟器检查可见性条件，以创建扭曲或未扭曲的透视图。这些视图在数学上等同于真实的照片。此外，虚拟模拟器还可用于优化简单或复杂场景下的事前数据收集。此外，这个虚拟模拟器的摄影测量能够产生自由姿态的单一或多个立体对；后一种可能性允许创建手动或自动计算机动画。如果改变内部方向参数，也可以重建图像镜头。因此，每个摄影测量项目的每台相机的性能可以在开始之前进行分析。
This paper shows the use of synthetic images obtained from digital surface models to optimize, on the one hand, photogrammetric planning, and on the other, computer animations. Synthetic images are generated in a photogrammetric simulator built up to project 3D models onto images, after defining a virtual (or real) photogrammetric camera with known inner orientation parameters. The outer orientation parameters are saved whenever a synthetic image is taken. The 3D model is design with simple own format metadata, and is able to recognize 3D solids stored in a library. Each solid is spatially georeferenced and can be combined with any others to generate complex structures. When projecting the 3D model to the set of images, the simulator checks visibility conditions in order to create either distorted or undistorted perspective views. These views are mathematically equivalent to real photographic shots. Besides, the virtual simulator can also be used to optimize before-hand data collection on simple or complex scenarios. Additionally, this virtual simulator for photogrammetry is able to produce free-attitude single or multiple stereo pairs; the latter possibility allows the creation of manual or automatic computer animations. The recreation of image shots is also possible if the inner orientation parameters are changed. Therefore, the performance of each camera for each photogrammetric project can be analysed before starting it.