Abstract
With the development of UAV and oblique photogrammetry technology, the multi-view stereo image has become an important data source for 3D urban reconstruction, and the surface meshes generated by it have become a common way to represent the building surface model due to their high geometric similarity and high shape representation ability. However, due to the problem of data quality and lack of building structure information in multi-view stereo image data sources, it is a huge challenge to generate simplified polygonal models from building surface meshes with high data redundancy and fuzzy structural boundaries, along with high time consumption, low accuracy, and poor robustness. In this paper, an improved mesh representation strategy based on 1-ring patches is proposed, and the topology validity is improved on this basis. Experimental results show that our method can reconstruct the concise, manifold, and watertight surface models of different buildings, and it can improve the processing efficiency, parameter adaptability, and model quality.
Highlights
To intuitively reflect the effect of topology optimization, we show the modeling results of several building mesh models processed by our method in Figure 9, and we compared them with the results of two other polygonization methods
The main structure and important details of the building could be restored, and the watertight manifold polygonal model composed of a few planes was generated
This paper introduced a simplification strategy of the building surface mesh model based on the 1-ring patch and topology optimization
Summary
As a product of the deep integration of UAV and photogrammetry technology, oblique photography technology can collect high-precision multi-vision stereo images conveniently and cheaply, and it is becoming the main means for the rapid updating of urban spatial information [3,4]. Meshlab [12], Geomagic Wrap [13], Agisoft Metashape [14], VisualSFM [15], and other software are accessible for the pursuit of meshing techniques. These algorithms and software use the triangular facet as the representation primitive and maximize the authenticity by the approximate fitting of building surfaces
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