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Image analysis of petrographic textures and fabrics using semivariance

Published online by Cambridge University Press:  05 July 2018

Andrew R. H. Swan  and
Jane A. Garratt
Andrew R. H. Swan
Affiliation:
School of Geological Sciences, Kingston University, Penrhyn Road, Kingston upon Thames, Surrey, KT1 2EE, UK
Jane A. Garratt
Affiliation:
School of Geological Sciences, Kingston University, Penrhyn Road, Kingston upon Thames, Surrey, KT1 2EE, UK
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Abstract

Many subjective descriptive terms such as ‘smooth’, ‘coarse’ and ‘anisotropic’ are routinely used to convey properties of textures and fabrics, but these aspects of geological objects are not easily quantifiable. The use of directional semivariograms of image greylevels is assessed for this purpose. These quantify anisotropy of ‘coarseness/fineness’ by using semivariogram ranges, and ‘roughness/smoothness’ by using semivariogram sill values. These can be summarized by ellipses derived from semivariogram ranges and directions. The method will find applications in analysis of rock thin sections as well as analysis of surface texture of grains and microfossils.

Keywords

image analysispetrographic texturesfabricsemivariance
Type
Image analysis
Information
Mineralogical Magazine , Volume 59 , Issue 395 , June 1995 , pp. 189 - 196
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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