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|Title:||Image segmentation using a hybrid technique by combining optical and digital methods|
|Abstract:||A double-layer capacitance and EIS studies on galena in absence and presence of sodium isopropyl xanthate at high concentrated solution in a wide range of polarization potentials is presented. A cyclic voltammetry study complements the EIS and double-layer capacitance data. The shape of the capacitance-potential curve as a function of the xanthate concentration evidences a large surface modification of the galena interface at high thiocollector concentrations. Potential Zero Charge (PZC) for the system at -0.31 V vs. SCE coincides with the oxidation and adsorption of xanthate (X -) on the galena surface, determined from the capacitance-potential curves. The impedance spectrum for the system obtained in the presence of X - (0.1 M) at the PZC show two time-constants associated to the oxidation and adsorption of X - and the subsequent formation of dixanthogen (X) 2 according to experimental results obtained and previous data published in the literature. EIS data at more positive potentials than PZC (+0.1 V, 0.2 V) show an inductive loop which is associated to a charge transfer processes which involves the reaction of the adsorbed intermediates Pb(X) 2 and Pb(OH) 2 with the consequent modification of the PbS-sodium isopropyl xanthate interface. These results provide new findings that contribute to a better understanding of the galena-xanthate interface at high xanthate concentrations. " 2011 by ESG.",,,,,,,,,"http://hdl.handle.net/20.500.12104/42099","http://www.scopus.com/inward/record.url?eid=2-s2.0-84855385970&partnerID=40&md5=b372b9dab23805d817056451595b4f8c",,,,,,"12",,"International Journal of Electrochemical Science",,"6319|
WOS",,,,,,"EIS; Galena; PZC; Xanthate",,,,,,"Impedance study during anodic oxidation of native galena in a highly concetrated xanthate solution",,"Article" "43844","123456789/35008",,"Aguayo Adame, J.P., Electronic Department, University of Guadalajara, Av. Revolución #1500, Guadalajara, Jalisco, CP. 44430, Mexico; Flores, J.L., Electronic Department, University of Guadalajara, Av. Revolución #1500, Guadalajara, Jalisco, CP. 44430, Mexico; Ferrari, J.A., Instituto de Física, Facultad de Ingeniería, Universidad de la República, Julio Herrera y Reissig 565, Montevideo, Uruguay; García-Torales, G., Electronic Department, University of Guadalajara, Av. Revolución #1500, Guadalajara, Jalisco, CP. 44430, Mexico",,"Aguayo Adame, J.P.
García-Torales, G.",,"2011",,"We present an image segmentation method based on the use of an optical technique for detection of contours (as a preprocessing stage) and a posterior digital segmentation algorithms. The contouring technique is utilized to find an accurate contour and it is based on the polarization features of the twisted-nematic liquid-crystal displays (TNLCDs). TN-LCDs are manufactured to work between a crossed polarizer-analyzer pair. When the analyzer is at 45 deg (instead of 90 deg) with respect to the polarizer, one obtains an optically processed image with pronounced outlines (dark contours) at middle intensity. On other hand, the segmentation algorithms are based on active shape models or snakes. Experimental results show that the proposed technique yields accurate segmentation for low-contrast images. Also, we demonstrate that this hybrid-system has a better performance than purely digital algorithms. " 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).
|Appears in Collections:||Producción científica UdeG|
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