Abstract
Abstract. In this paper a method is presented which allows the measurement of deflections and torsion by means of the silhouette of an object in images. The method is based on a finite element description of a beam. The benefit of this method is the determination of the deformation out of the silhouette of an object in images without the need of signalization. The presented method is tested against simulated data as well as against real objects in laboratory tests. As an outlook the presented method can be further modified. By combination with a laser scanner it seems to be possible to replace the CAD model of an object with the point clouds of one or more kinematic laser scans.
Highlights
In geodesy the measurement of deformations is a well-known topic
In this publication a method is described which allows the determination of deflections and torsion out of the silhouette in images
This method was tested against simulated data and laboratory tests
Summary
In geodesy the measurement of deformations is a well-known topic. It ranges from measurement of discrete points up to surface comparisons with point clouds. Established methods like image matching or point tracking cannot be used for the registration of kinematic deformations of non-textured objects. One example is the measurement of rotor blade deformations on site. By passing the tower of a wind power plant the rotor blades are affected by the air pressure close to the tower, for example. A new photogrammetric target less approach has been developed using the silhouettes of the rotor blades in images. The method is based on a combination of image contour measurements with a kinematic finite element model of the object. Points clouds of the surface, e.g. acquired by terrestrial laser scanning, or CAD models can be integrated
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