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Paper convr-2013-60:
3d scan planning of outdoor constructions based on photogrammetric model and mathematical optimization

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Dan H,Yasumuro Y,Ishigaki T,Nishigata T

3d scan planning of outdoor constructions based on photogrammetric model and mathematical optimization

Abstract:A 3D scanner is capable of capturing surface shapes of the objects as a set of point cloud and is extending its applicability toward examining, re-designing and preserving the existing constructions as well as on-site information for BIM. One of the most difficult problems to collect complete surface data of outdoor constructions is to avoid self and mutual occlusions. If we want to collect complete data for covering whole surfaces of the constructions, then we have to measure them from multiple points usually. Moreover, multiple measurements require plenty of time and labor, and each measurement gives a data set consisting of hundreds of millions of 3D points to be processed for further computations. So it is very important to make an effective measurement plan a priori for avoiding redundancy for both labor and computational costs. In this research, therefore, we propose a method for 3D-scan planning of outdoor constructions based on photogrammetric models and mathematical optimization methods. In our proposed method, we first use photogrammetric techniques and make a rough 3D model of measurement scenery: we take photographs of the targets by a calibrated digital camera, and find corresponding characteristic points over the photographs, for example corners and intersection points of edge lines. Next, we triangulate the corresponding points by using 3D photo-modeling software. Finally, we obtain the rough 3D mesh model. After that, we make the optimal scan plan based on the rough 3D mesh model by using some mathematical methods: we examine the visibility and self/mutual occlusion property of each polygon of the 3D mesh, and calculate the minimum number of measurement points and their layout to scan all the surfaces of the targets. Moreover, our proposed method can calculate the optimal layout of the designated number of measurement points to maximize the obtainable data.

Keywords:3D-Scan Planning,Photogrammetric Model,Mathematical Optimization

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