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Title:	Use of light-emitting diodes in multispectral systems design: variability of spectral power distribution according to angle and time of usage
Author:	Martínez, Oscar; Vilaseca Ricart, Meritxell; Arjona Carbonell, Mª Montserrat; Pizarro Bondia, Carlos; Pujol Ramo, Jaume
Other authors:	Universitat Politècnica de Catalunya. Departament d'Òptica i Optometria; Universitat Politècnica de Catalunya. GREO - Grup de Recerca en Enginyeria Òptica
Abstract:	Multispectral systems allow the spectral and color characterization of objects using images obtained from several acquisition channels with different spectral sensitivities. Light sources based on light-emitting diodes have started to be used in multispectral systems, mainly to develop low-cost devices for the industry. In this study, the authors examine the variability of spectral power distribution according to the viewing angle of white and single color light-emitting diodes, which can have a significant impact on spectral and color accuracy. This must be taken into account if they are to be used in multispectral systems design. The spectrum drift according to the time of usage of white light-emitting diodes is also analyzed.
Abstract:	Peer Reviewed
Subject(s):	-Àrees temàtiques de la UPC::Enginyeria electrònica::Optoelectrònica -Light-emitting devices -Imaging detectors and sensors -Imatges -- Processament -- Tècniques digitals
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Document type:	Article - Published version Article
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