MetropoGIS a city modeling system

                         Joachim Bauer
                    bauer@icg.tu-graz.ac.at

I will present the city modeling system we developed at VRVis Research
Center and say a few words about a new project I already started at
CMP.

Abstract:

We present a city modeling system that was developed at the VRVis
Research Center in Graz. The system is specially targeted for modeling
from terrestrial images i.e. facade images and covers all aspects from
image acquisition to the final 3D Point cloud. In a feature extraction
step we detect line segments and subseqently compute intersections of
those line segments, which serve as points-of-interest. The relative
ortientation between the images is computed from the
points-of-interest by detecting plane homographies.  In the modeling
step we apply sweep-based algorithms to detect 3D line segments and 3D
planes. An area-based dense matching step then yields dense 3D point
clouds with an inherent triangulation. Finally we compute an
ortho-rectified texture for the facade using all input images.