AUTOMATIC PROCESS FOR MACERAL ANALYSIS AND IDENTIFICATION OFTHE REFLECTIVE POWER OF VITRINITE IN COALS

摘要

Maceral analysis method of carbon on a sample consisting of ground coal coated in resin by exploring the surface of the sample using a microscope and by measuring the reflectivity of the vitrinite, characterized by the following steps: - for each field of the microscope, a digitized gray level image is produced; - Fields with a high resin content are eliminated by thresholding; - for each field not eliminated: a) the distributions of the gray levels and the gradients are determined; b) a binary image is produced by thresholding the gray gradients so as to determine zones of vitrinite; c) determining the distribution of the gray levels or densitometry of the vitrinite zones obtained; and d) the reflective power of the vitrinite is calculated.