Segmentation of petrographical images of marbles
Computers & Geosciences
A computer-controlled rotating polarizer stage for the petrographic microscope
Computers & Geosciences
Edge detection in petrographic images using the rotating polarizer stage
Computers & Geosciences
Mineral identification using artificial neural networks and the rotating polarizer stage
Computers & Geosciences - Geological Applications of Digital Imaging
Short note: Pixel counting for percentage estimation: Applications to sedimentary petrology
Computers & Geosciences
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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.