A New Method for Experimentally Quantifying Dynamic Deflection of a Cylindrical Structure

Nixon, C. A.; Marcum, Wade R.; Steer, K. M.; Jackson, R.

doi:10.1007/s11340-018-0425-0

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…Xu et al [31] conducted studies on the measurement accuracy and efficiency using compensation methods based on digital image correlation (DIC). Other studies have also been conducted to evaluate the accuracy achieved with image-based methods, for example, for deformation measurements [32,33], shape measurement [34] and deflection in cylindrical structure [35]. Remondino et al [15] commented on the difficulties in defining an evaluation element (entire surface, small patches or points) and which procedure to use for accuracy assessment.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of Cylindrical Surfaces Using Digital Image Correlation

Berveglieri

Tommaselli

2018

Sensors

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A technique for the reconstruction of cylindrical surfaces using optical images with an extension of least squares matching is presented. This technique is based on stereo-image acquisition of a cylindrical object, and it involves displacing the camera following the object length. The basic concept behind this technique is that variations in the camera viewpoint over a cylindrical object produce perspective effects similar to a conic section in an image sequence. Such parallax changes are continuous and can be modelled by a second-order function, which is combined with an adaptive least squares matching (ALSM) for the 3D object reconstruction. Using this concept, a photogrammetric intersection with only two image patches can be used to model a cylindrical object with high accuracy. Experiments were conducted with a cylinder on a panel with coded targets to assess the 3D reconstruction accuracy. The accuracy assessment was based on a comparison between the estimated diameter and the diameter directly measured over the cylinder. The difference between the diameters indicated an accuracy of 1/10 mm, and the cylindrical surface was entirely reconstructed.

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