期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2004
卷号：XXXV Part B3
页码：623-626
出版社：Copernicus Publications
摘要：We propose a new method that can realize rapid generation of true orthoimages from area-type sensor images, accelerated by triangle-based visibility analysis. A Triangular-P rism Model (TP M) for 3-D space description and triangle-based visibility analysis is introduced. TPM, considered as an extension of TIN model, consists of triangular prisms and every top triangle is the surface of the ground, buildings, and other objects on the ground. Vertical walls also can be expressed with the side faces of prisms. TPM simplifies visibility analysis between elements of surface model. The visibility among a group of triangular prisms can be related with that of a group of 2-D triangles that are the projection of the prisms onto 2-D space. This paper introduces visibility sorting, where triangular prisms are sorted according to the visibility from the viewpoint. The visibility sorting has been applied to true orthoimage processing where occlusions by buildings are essential. Tests with 30 aerial images of Shinjuku area shows that occluded area around building can be extracted in each true orthoimage. True orthoimages can be synthesized into one composite true orthoimage where occluded areas of one image are compensated with other true orthoimages
关键词：Orthorectification; Photogrammetry; Algorithms; Orthoimage; Transformation; Visibility Analysis; Triangular ; P rism Model; 3-D space description
