Outal, Souhaïl (2006) Quantification by image analysis of the size distribution of fragmented rocks: improvment of the morphological extraction of surfaces, improvment of the stereological rebuilding. PhD thesis Techniques et économie de l'exploitation du sous-sol, Centre de Géosciences, ENSMP p.233.
Abstract
This research deals with a more general context of the quality control for some important operations in minig production, predominantly blasting, crushing and grinding. It is interested more in the granulometry quantification of the fragmented rocks by using image processing. In general, the developement work is mainly related to the improvment of two most important stages of measurement: the contours extraction of the fragments at the image (2D) and the rebuilding of the 3D size-distribution-curve ( stage of stereology,3D). Nowadays, screening ( or more general the sifting)is the most used and important process for measuring the granulometry of the fragmented rocks. It is therfore considered as the current reference of measurement. Consequently, any measurement established by image processing will then be valited on the basis of screening's result.
With regard to the stage of contours extraction of fragments, the major problem is how to determine the correct filtering of the noise at the image. First of all, new tools for filtering, based on the residual morphological transformations and rather powerful and adapted to the case of fragment images of rocks, are introduced and evaluated. The study undertaken on grey level images, approaches the various aspects of the noise problems from a topographic point of view. Surfaces of fragments are then extracted carefully with the help of a segmentation of the image. The extraction process is principally based on the construction of a watershed controlled by the markers, which are extracted by filtering. The robustness and the automation of the step are afterward validated for sevarl case of images of rocks fragments.
The second problem carried out in this rsearch is the rebuilding of 2D size-distribution-curve starting from the surfaces extracted by image processing. In order to avoid the interference of many skews related to this stage, we recommand to separate the problem into two subproblems according to the origin of analysed materials (cut down heap, truck, belt conveyor)
Finally, the results obtained in this research for the case of the fragments of rocks as well as for oher type of images of granaular elements, enable us presently to consider a valorisation not only for mineral industry but also for other fields such as the agro industry, the pharmaceutical industry and cement factories.
| Item Type: | PhD Thesis (PhD) |
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| Thesis Supervisor: | Beucher, Serge and Schleifer, Jacques |
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| Date: | 01 June 2006 |
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| Board of examiners: | Jeulin, Dominique and Riss, Joëlle and Pirard, Eric and Beucher, Serge and Moser, Peter and Schleifer, Jacques and Chavez, Ricardo |
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| Ecole Doctorale: | ED 430 MATÉRIAUX, OUVRAGES, DURABILITÉ, ENVIRONNEMENT ET STRUCTURES |
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| Discipline: | Techniques et économie de l'exploitation du sous-sol |
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| Collection (Fonds): | ENSMP |
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| Institution: | ENSMP |
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| Department: | Centre de Géosciences |
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| Subjects: | 8. Earth Sciences and Environmental Engineering |
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| Uncontrolled Keywords: | Mesure granulométrique, Analyse d'images, Morphologie mathématique, Sur-segmentation, Fusion, Particules fines, Filtrage, Opérateur résiduel numérique, Marquage, Boule maximale inscrite, Reconstruction volumique, Passant cumulé, Histogramme, Ségrégation, Recouvrement et chevauchement, Modèle de feuilles mortes, Statistique des grains intacts |
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