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Resolution of the Wicksell's equation by Minimum Distance Estimation

Article dans une revue avec comité de lecture
Author
DEPRIESTER, Dorian
211915 Mechanics surfaces and materials processing [MSMP]
KUBLER, Régis
211915 Mechanics surfaces and materials processing [MSMP]

URI
http://hdl.handle.net/10985/17597
Date
2019
Journal
Image Analysis and Stereology

Abstract

The estimation of the grain size in granular materials is usually performed by 2Dobservations. Unfolding the grain size distribution from apparent 2D sizes is commonly referred as the corpuscle problem. For spherical particles, the distribution of the apparent size can be related to that of the actual size thanks to the Wicksell’s equation. The Saltikov method, which is based on Wicksell’s equation, is the most widely used method for resolving corpuscle problems. This method is recursive and works on the finite histogram of the grain size. In this paper, we propose an algorithm based on a minimizing procedure to numerically solve the Wicksell’s equation, assuming a parametric model for the distribution (e.g. lognormal distribution). This algorithm is applied on real material and the results are compared to those found using Saltikov or Saltikov-basedstereology techniques. A criterion is proposed for choosing the number of bins in the Saltikov method. The accuracy of the proposed algorithm, depending on the sample size, is studied.

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