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Materials 2018, 11(8), 1461;

Analysis of Surface Extraction Methods Based on Gradient Operators for Computed Tomography in Metrology Applications

Department of Industrial Engineering, Autonomous University of Baja California, 21100 Mexicali, Mexico
Centro Universitario de la Defensa, A.G.M. Carretera Huesca s/n, 50090 Zaragoza, Spain
I3A, Universidad de Zaragoza, María de Luna 3, 50018 Zaragoza, Spain
Author to whom correspondence should be addressed.
Received: 6 July 2018 / Revised: 13 August 2018 / Accepted: 14 August 2018 / Published: 17 August 2018
(This article belongs to the Special Issue Special Issue of the Manufacturing Engineering Society (MES))
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Among the multiple factors influencing the accuracy of Computed Tomography measurements, the surface extraction process is a significant contributor. The location of the surface for metrological applications is generally based on the definition of a gray value as a characteristic of similarity to define the regions of interest. A different approach is to perform the detection or location of the surface based on the discontinuity or gradient. In this paper, an adapted 3D Deriche algorithm based on gradient information is presented and compared with a previously developed adapted Canny algorithm for different surface types. Both algorithms have been applied to nine calibrated workpieces with different geometries and materials. Both the systematic error and measurement uncertainty have been determined. The results show a significant reduction of the deviations obtained with the Deriche-based algorithm in the dimensions defined by flat surfaces. View Full-Text
Keywords: computed tomography; surface extraction; Canny algorithm; Deriche algorithm computed tomography; surface extraction; Canny algorithm; Deriche algorithm

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Ontiveros, S.; Jiménez, R.; Yagüe-Fabra, J.A.; Torralba, M. Analysis of Surface Extraction Methods Based on Gradient Operators for Computed Tomography in Metrology Applications. Materials 2018, 11, 1461.

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