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1. 发明授权

US5317689A Digital visual and sensor simulation system for generating realistic scenes 失效
标题翻译：数字视觉和传感器仿真系统，用于生成现实场景
公开(公告)号：US5317689A
公开(公告)日：1994-05-31
申请号：US565864
申请日：1990-08-10
申请人： Myron L. Nack , Thomas O. Ellis , Norton L. Moise , Andrew Rosman , Robert J. McMillen , Chao Yang , Gary N. Landis
发明人： Myron L. Nack , Thomas O. Ellis , Norton L. Moise , Andrew Rosman , Robert J. McMillen , Chao Yang , Gary N. Landis
IPC分类号： G06F20060101 , G06T15/06 , G06T15/40 , G09B9/30 , G06F15/16 , G06F15/66
CPC分类号： G06T15/06 , G06T15/40 , G09B9/301
摘要： A system using a ray-tracing algorithm and a hierarchy of volume elements (called voxels) to process only the visible surfaces in a field of view. In this arrangement, a dense, three-dimensional voxel data base is developed from the objects, their shadows and other features recorded, for example, in two-dimensional aerial photography. The rays are grouped into subimages and the subimages are executed as parallel tasks on a multiple instruction stream and multiple data stream computer (MIMD). The use of a three-dimensional voxel data base formed by combining three-dimensional digital terrain elevation data with two-dimensional plan view and oblique view aerial photography permits the development of a realistic and cost-effective data base. Hidden surfaces are not processed. By processing only visible surfaces, displays can now be produced depicting the nap-of-the-earth as seen in low flight of aircraft or as viewed from ground vehicles. The approach employed here is a highly-parallel data processing system solution to the nap-of-the-earth flight simulation through a high level of detail data base. The components of the system are the display algorithm and data structure, the software which implements the algorithm and data structure and creates the data base, and the hardware which executes the software. The algorithm processes only visible surfaces so that the occulting overload management problem is eliminated at the design level. The algorithm decomposes the image into subimages and processes the subimages independently.
摘要翻译：使用光线跟踪算法和体积元素（称为体素）的层次结构来处理视野中的可见表面的系统。在这种布置中，从物体，它们的阴影和其它特征（例如二维航空摄影）中开发出一个致密的三维体元数据库。光线被分组成子图像，并且子图像被执行为多指令流和多数据流计算机（MIMD）上的并行任务。通过将三维数字地形高程数据与二维平面视图和斜视图航空摄影结合形成的三维体素数据库的使用允许开发一个现实且具有成本效益的数据库。隐藏的表面不被处理。通过仅处理可见的表面，现在可以制作出显示器，描绘飞行器的低飞行物或从地面车辆观察的地球上的小睡。这里采用的方法是高度并行的数据处理系统解决方案，通过高水平的细节数据库进行地面飞行模拟。系统的组件是显示算法和数据结构，实现算法和数据结构并创建数据库的软件以及执行软件的硬件。该算法只处理可见表面，从而在设计级别消除了隐蔽的过载管理问题。该算法将图像分解为子图像，并独立处理子图像。

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