1. ECWAY TECHNOLOGIES
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A HYBRID MULTIVIEW STEREO ALGORITHM FOR
MODELING URBAN SCENES
ABSTRACT:
We present an original multiview stereo reconstruction algorithm which allows the 3D-modeling
of urban scenes as a combination of meshes and geometric primitives. The method provides a
compact model while preserving details: Irregular elements such as statues and ornaments are
described by meshes, whereas regular structures such as columns and walls are described by
primitives (planes, spheres, cylinders, cones, and tori).
We adopt a two-step strategy consisting first in segmenting the initial meshbased surface using a
multilabel Markov Random Field-based model and second in sampling primitive and mesh
components simultaneously on the obtained partition by a Jump-Diffusion process. The quality
of a reconstruction is measured by a multi-object energy model which takes into account both
photo-consistency and semantic considerations (i.e., geometry and shape layout).
The segmentation and sampling steps are embedded into an iterative refinement procedure which
provides an increasingly accurate hybrid representation. Experimental results on complex urban
structures and large scenes are presented and compared to state-of-the-art multiview stereo
meshing algorithms.