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An automated surface determination approach for computed tomography

Yang, X; Sun, W; Giusca, C (2022) An automated surface determination approach for computed tomography. NDT & E International, 131. 102697

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The marker-controlled watershed (MCW) algorithm is a robust surface determination algorithm for X-ray computed tomography (XCT) dimensional metrology in determining smooth surfaces with the advantages of reducing errors caused by noise, beam hardening artefact and operator factor. However, it has not been evaluated for surfaces with a significant level of rough surface texture. This work compared three surface determination algorithms: MCW, VGStudio’s advanced iterative algorithm, and the 3D Canny algorithm for the evaluation of rough surfaces. NPL’s prototype three-dimensional roughness standard (3DRS) was used; this reference sample features additively manufactured (AM) surface texture features. Surfaces were obtained using the above-mentioned surface determination algorithms. Then, profiles extracted from those surfaces were compared with the reference data measured by a calibrated profilometer. The preliminary results show that MCW outperforms the other two algorithms in eliminating the impact of noise and beam hardening.

Item Type: Article
Subjects: Engineering Measurements > Dimensional
Divisions: Materials and Mechanical Metrology
Identification number/DOI: 10.1016/j.ndteint.2022.102697
Last Modified: 14 Oct 2022 13:50
URI: http://eprintspublications.npl.co.uk/id/eprint/9521

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