Segmentation d'images couleur par un opérateur gradient vectoriel ...

QUANTIFICATION ET MORPHOLOGIE DE PHASES DE CLINKER PAR ANALYSE D'IMAGE.
New methods for clinker phase recognition
using automatic image analysis 4
a, b
a a a
A. ANWANDER , B. NEYRAN , J. HAASE and A. BASKURT
a CREATIS, CNRS Research Unit (UMR 5515), affiliated to INSERM, Lyon, France.
b LAFARGE CIMENTS, Research Center Viviers, France.
Abstract
Microscopic analysis provides information about the dimensions and the crystallographic
composition of polished sections of Portland cement clinker. To reduce the amount of expert
time needed to acquire reliable data and to make the work easier, the use of modern tools offered
by computer image analysis is proposed. The objective of this study is to develop a new
automatic image analysis procedure for performing phase distribution analysis. New algorithms in
digital image analysis of clinker are proposed and their advantages over the previous studies are
shown. To complete the analysis by crystal measurement, a fast interactive method is developed
The proposed automatic image analysing system uses colour images acquired from the
optical microscope by a video-camera and a PC. The image analysis procedure is based on the
model of the well-known point counting process. Image points are taken in regular distances and
they are assigned to the different crystal classes. A point is classified by the texture and colour
characteristics of its neighbourhood, which allows the identification the crystals in clinkers of
different origins, with variations on the chemical etching.
The tool for crystal analysis was designed to minimise human intervention and the burden
of manual operations. The practical use shows the ease of use and the economy of this tool. The
results agree to a great extent with those obtained by an expert via point counting. The tool will
be extended to work out morphological and structural parameters automatically.
4 Cet article a été publié dans le numéro d'avril 1998 du journal international "WORLD CEMENT" (World
Cement, Vol. 29, N° 4, pp. 77-84, 1998) [Anwander et al., 1998].
WORLD CEMENT RESEARCH AND DEVELOPMENT 1998 95