Avtor/Urednik		Tarquini, Simone; Armienti, Pietro
Naslov		Film color scanner as a new and cheap tool for image analysis in petrology
Tip		članek
Vir		Image Anal Stereol
Vol. in št.		Letnik 20, št. 2 Suppl 1
Leto izdaje		2001
Obseg		str. 567-72
Jezik		eng
Abstrakt		An acquisition and analysis method based on commercial, low-cost, high-resolution film scanner is presented. It allows to collect data from standard rock thin section with a resolution up to 9.4`m/pixel. Common general purposes facilities (scanner + PC + image analysis software) may thus be transformed in a cheap tool for quantitative textural analysis of rocks. The procedure implies the acquisition of four images with crossed polarizers and one parallel light image. Crystal boundaries are extracted from fields in crossed polarizers, while markers for mineral recognition are obtained thresholding the parallel light image. The method is tested for fresh rocks with simple mineralogy (harzburgites and marbles) with no more than three different phases exhibiting well distinct optical properties. lmage processing is perfonned developing procedures with VISILOG 5.2 package. 2-D size data from binary images are converted in 3-D size data applying stereological corrections. 3-D data are reported in bi-logarithmic diagrams, plotting the crystal number density versus characteristic lengths. The harzburgite samples show scale invariance of size distributions of olivine while mosaic equant marbles exhibit a different size distribution patterns, without scale invariance and a relative maximum.
Deskriptorji		MINERALS CRYSTALLIZATION MICROSCOPY, ELECTRON PARTICLE SIZE IMAGE PROCESSING, COMPUTER-ASSISTED