Article (Scientific journals)
X-ray microtomography: A porosity-based thresholding method to improve soil pore network characterization?
Beckers, Eléonore; Plougonven, Erwan; Roisin, Christian et al.
2014In Geoderma, 219-220, p. 145-154
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Keywords :
X-ray microtomography; soil structure; threshold; image processing; binarisation; visible-porosity
Abstract :
[en] X-ray microtomography, through quantification of soil structure at the microscale, could greatly facilitate the current understanding of soil hydrodynamic behaviour. However, binarisation method and processing choices are subjective and can have a strong impact on results and conclusions. In this study, we test a new method based on the porosity detectable by X-ray microtomography, while validation is achieved through comparison of soil microtomogram information with soil physical measurements. These measurements consist of water retention and unsaturated hydraulic conductivity using two different soil populations with only structural differences. To assess the porosity-based method performances, we compare it to four other methods, namely the global method of Otsu and three recent soil-dedicated local methods. The robustness of the porosity-based method is also tested in regard to different pre-processing procedures. In this paper we demonstrate that soil segmentation through a porosity-based method is an interesting issue. Indeed, it is less demanding in terms of time and computational requirements than its alternatives, and combines robustness and performances broadly comparable with the recent local methods.
Disciplines :
Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Beckers, Eléonore ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Systèmes Sol-Eau
Plougonven, Erwan  ;  Université de Liège - ULiège > Département de chimie appliquée > Département de chimie appliquée
Roisin, Christian;  Centre Wallon de Recherches agronomiques - CRA-W > Département d'Agriculture et Milieu Naturel > Fertilité des Sols et Protection des Eaux
Hapca, Simona;  University of Abertay Dundee > SIMBIOS Centre > School of Contemporary Sciences
Léonard, Angélique  ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Procédés et développement durable
Degré, Aurore  ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Systèmes Sol-Eau
Language :
English
Title :
X-ray microtomography: A porosity-based thresholding method to improve soil pore network characterization?
Publication date :
May 2014
Journal title :
Geoderma
ISSN :
0016-7061
eISSN :
1872-6259
Publisher :
Elsevier Science
Volume :
219-220
Pages :
145-154
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 29 January 2014

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