Article (Scientific journals)
Multispectral imaging of ore minerals in optical microscopy
Pirard, Eric
2004In Mineralogical Magazine, 68 (2), p. 323-333
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Keywords :
sulphide parageneses; reflectance measurements; optical microscopy; ore minerals; multispectral imaging
Abstract :
[en] Multispectral imaging of ore minerals under the microscope is a logical extension of quantitative colour analysis and microspectrophotometric analysis of minerals. This paper describes, step by step, how the proper calibration of a scientific video camera can be performed in order to obtain precise reflectance measurements at each pixel within the field of view. After having reviewed the different sources of noise and aberration, practical formulae are presented that allow for the acquisition of a set of images at different wavelengths in the visible spectrum. The advantage of using a multispectral image acquisition system based on narrow bandwidth (10 nm) interference filters is discussed and quantitatively compared to colour imaging using tri-stimulus (red, green, blue) filters. Images taken from major sulphide parageneses are shown as examples of well contrasted multispectral images. Finally, the potential for automatic identification of ore minerals is discussed with reference to supervised multivariate image classification algorithms similar to those used in remote sensing. Additional comments on extending the principles for handling optical anisotropy and developing a multiradial imaging system are made.
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Pirard, Eric  ;  Université de Liège - ULiège > Département Argenco : Secteur GeMMe > Géoressources minérales & Imagerie géologique
Language :
English
Title :
Multispectral imaging of ore minerals in optical microscopy
Publication date :
2004
Journal title :
Mineralogical Magazine
ISSN :
0026-461X
eISSN :
1471-8022
Publisher :
Mineralogical Society of Great Britain, London, United Kingdom
Volume :
68
Issue :
2
Pages :
323-333
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 18 August 2008

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