Segmentation d'images couleur par un opérateur gradient vectoriel ...
Segmentation d'images couleur par un opérateur gradient vectoriel ...
Segmentation d'images couleur par un opérateur gradient vectoriel ...
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QUANTIFICATION ET MORPHOLOGIE DE PHASES DE CLINKER PAR ANALYSE D'IMAGE.<br />
New methods for clinker phase recognition<br />
using automatic image analysis 4<br />
a, b<br />
a a a<br />
A. ANWANDER , B. NEYRAN , J. HAASE and A. BASKURT<br />
a CREATIS, CNRS Research Unit (UMR 5515), affiliated to INSERM, Lyon, France.<br />
b LAFARGE CIMENTS, Research Center Viviers, France.<br />
Abstract<br />
Microscopic analysis provides information about the dimensions and the crystallographic<br />
composition of polished sections of Portland cement clinker. To reduce the amo<strong>un</strong>t of expert<br />
time needed to acquire reliable data and to make the work easier, the use of modern tools offered<br />
by computer image analysis is proposed. The objective of this study is to develop a new<br />
automatic image analysis procedure for performing phase distribution analysis. New algorithms in<br />
digital image analysis of clinker are proposed and their advantages over the previous studies are<br />
shown. To complete the analysis by crystal measurement, a fast interactive method is developed<br />
The proposed automatic image analysing system uses colour images acquired from the<br />
optical microscope by a video-camera and a PC. The image analysis procedure is based on the<br />
model of the well-known point co<strong>un</strong>ting process. Image points are taken in regular distances and<br />
they are assigned to the different crystal classes. A point is classified by the texture and colour<br />
characteristics of its neighbourhood, which allows the identification the crystals in clinkers of<br />
different origins, with variations on the chemical etching.<br />
The tool for crystal analysis was designed to minimise human intervention and the burden<br />
of manual operations. The practical use shows the ease of use and the economy of this tool. The<br />
results agree to a great extent with those obtained by an expert via point co<strong>un</strong>ting. The tool will<br />
be extended to work out morphological and structural <strong>par</strong>ameters automatically.<br />
4 Cet article a été publié dans le numéro d'avril 1998 du journal international "WORLD CEMENT" (World<br />
Cement, Vol. 29, N° 4, pp. 77-84, 1998) [Anwander et al., 1998].<br />
WORLD CEMENT RESEARCH AND DEVELOPMENT 1998 95