Int. J. Metrol. Qual. Eng.
Volume 11, 2020
|Number of page(s)||11|
|Published online||22 October 2020|
Estimation of minimum volume of bounding box for geometrical metrology
Department of Mechanical and Industrial Engineering, NTNU, NO-7491 Trondheim, Norway
* Corresponding author: firstname.lastname@example.org
Accepted: 24 September 2020
This paper presents algorithms for estimating the minimum volume bounding box based on a three-dimensional point set measured by a coordinate measuring machine. A new algorithm, which calculates the minimum volume with high accuracy and reduced number of computations, is developed. The algorithm is based on the convex hull operation and established theories about a minimum bounding box circumscribing a convex polyhedron. The new algorithm includes a pre-processing operation that removes convex polyhedron faces located near the edges of the measured object. As showed in the paper, the solution of the minimum bonding box is not based on faces located near the edges; therefore, we can save computation time by excluding them from the convex polyhedron data set. The algorithms have been demonstrated on physical objects measured by a coordinate measuring machine, and on theoretical 3D models. The results show that the algorithm can be used when high accuracy is required, for example in calibration of reference standards.
Key words: Minimum volume bounding box / minimum bounding rectangle / convex polyhedron / CMM
© P. Chelishchev and K. Sørby, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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