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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6759

Authors: Tarquini, S.*
Favalli, M.*
Title: A microscopic information system (MIS) for petrographic analysis
Title of journal: Computers & Geosciences
Series/Report no.: 5/36(2010)
Publisher: Elsevier
Issue Date: May-2010
DOI: 10.1016/j.cageo.2009.09.017
Keywords: Granitoid rocks
Geographic Information System (GIS)
Image processing
Petrography
Abstract: The database and visualization facilities of Geographic Information System (GIS) software are employed to support the analysis of rock texture from thin section by image processing. A Microscopic Information System (MIS) is hence obtained. The method is applied to transmitted light images of 137 samples obtained from 8 granitoid rocks. A slide scanner and a mount for crossed polarization are used to acquire the input images. For each thin section 5 collimated RGB images are scanned: 4 under different directions of crossed polarization and 1 without polarization. A grain segmentation procedure, based on two region growing functions is applied. The output is converted to vector format and refined using editing tools in the MIS environment, which enables a straightforward match between the input imagery and the final vectorized texture. GIS software provides optimal management of the MIS database, allowing the cumulative measurement of more than 87,000 grains.
Appears in Collections:04.04.11. Instruments and techniques
04.04.09. Structural geology
04.04.05. Mineralogy and petrology
Papers Published / Papers in press

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