5 May 2017 Modified algorithm for mineral identification in LWIR hyperspectral imagery
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Abstract
The applications of hyperspectral infrared imagery in the different fields of research are significant and growing. It is mainly used in remote sensing for target detection, vegetation detection, urban area categorization, astronomy and geological applications. The geological applications of this technology mainly consist in mineral identification using in airborne or satellite imagery. We address a quantitative and qualitative assessment of mineral identification in the laboratory conditions. We strive to identify nine different mineral grains (Biotite, Diopside, Epidote, Goethite, Kyanite, Scheelite, Smithsonite, Tourmaline, Quartz). A hyperspectral camera in the Long Wave Infrared (LWIR, 7.7-11.8 ) with a LW-macro lens providing a spatial resolution of 100 μm, an infragold plate, and a heating source are the instruments used in the experiment. The proposed algorithm clusters all the pixel-spectra in different categories. Then the best representatives of each cluster are chosen and compared with the ASTER spectral library of JPL/NASA through spectral comparison techniques, such as Spectral angle mapper (SAM) and Normalized Cross Correlation (NCC). The results of the algorithm indicate significant computational efficiency (more than 20 times faster) as compared to previous algorithms and have shown a promising performance for mineral identification.
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Bardia Yousefi, Bardia Yousefi, Saeed Sojasi, Saeed Sojasi, Kévin Liaigre, Kévin Liaigre, Clemente Ibarra Castanedo, Clemente Ibarra Castanedo, Georges Beaudoin, Georges Beaudoin, François Huot, François Huot, Xavier P. V. Maldague, Xavier P. V. Maldague, Martin Chamberland, Martin Chamberland, } "Modified algorithm for mineral identification in LWIR hyperspectral imagery", Proc. SPIE 10214, Thermosense: Thermal Infrared Applications XXXIX, 102141H (5 May 2017); doi: 10.1117/12.2263090; https://doi.org/10.1117/12.2263090
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