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：2005
卷号：XXXVI-3/W24
出版社：Copernicus Publications
摘要：This study presents algorithms for semi-automatic 3D spatial polygon extraction from a pair of colored aerial images with a known external model solution. The algorithm consists of several consecutive stages: initial pointing by a human operator which defines the algorithm as semi-automatic, extraction of a bounding polygon in the left image space, calculation of the estimated height and transformation to the right image space, extraction of a bounding polygon in the right image space and an iterative process which matches both polygons and extracts the spatial polygon. This algorithm is based on a 2D approach to solving the 3D reality and can be employed in many feature extraction situations. In this study, the algorithm is used for the spatial extraction of roofs and is presented in a semi-automatic interactive non model-based approach. In the proposed method, the operator needs to point at every distinct planar part of the roof in the left image space (2D). For each pointing, a specific roof plane is automatically extracted. The intersection of these planes provides us with the detailed roof structure. To examine the algorithm efficiency, a semi-automatic system for roof extraction was developed. The results we obtained were satisfactory and it appears that the algorithm can be implemented on many types of roofs and under diverse photographic conditions. This article presents the algorithm, the experiments and the results
关键词：Building extraction; Roof extraction; City model; Digital photogrammetry; Semi-automation; Aerial images
