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dc.contributor.authorMartínez Verdú, Francisco Miguel
dc.contributor.authorPujol Ramo, Jaume
dc.contributor.authorVilaseca Ricart, Meritxell
dc.contributor.authorCapilla, Pascual
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Òptica i Optometria
dc.identifier.citationMartínez, F. [et al.]. Characterization of a digital camera as an absolute tristimulus colorimeter. A: European Conference on Colour in Graphics, Imaging and Vision (CGIV 2004). "Second European Conference on Colour in Graphics, Imaging and Vision (CGIV 2004)". Aachen: 2004, p. 409-413.
dc.description.abstractAn algorithm is proposed for the spectral and colorimetric characterization of digital still cameras (DSC) which allows to use them as tele-colorimeters with CIE-XYZ color output, in cd/m2. The spectral characterization consists of the calculation of the color-matching functions from the previously measured spectral sensitivities. The colorimetric characterization consists of transforming the RGB digital data into absolute tristimulus values CIE-XYZ (in cd/m2) under variable and unknown spectroradiometric conditions. Thus, at the first stage, a gray balance has been applied over the RGB digital data to convert them into RGB relative colorimetric values. At a second stage, an algorithm of luminance adaptation vs. lens aperture has been inserted in the basic colorimetric profile. Capturing the ColorChecker chart under different light sources, the DSC color analysis accuracy indexes, both in a raw state and with the corrections from a linear model of color correction, have been evaluated using the Pointer'86 color reproduction index with the unrelated Hunt'91 color appearance model. The results indicate that our digital image capture device, in raw performance, lightens and desaturates the colors.
dc.format.extent5 p.
dc.subjectÀrees temàtiques de la UPC::Ciències de la visió::Òptica física::Color
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació::Processament del senyal::Processament de la imatge i del senyal vídeo
dc.subject.lcshDigital cameras
dc.subject.lcshElectrochromic devices
dc.titleCharacterization of a digital camera as an absolute triestimulus colorimeter
dc.typeConference report
dc.subject.lemacColorimetria -- Aparells i instruments
dc.contributor.groupUniversitat Politècnica de Catalunya. GREO - Grup de Recerca en Enginyeria Òptica
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (published version)
local.citation.authorMartínez, F.; Pujol, J.; Vilaseca, M.; Capilla, P.
local.citation.contributorEuropean Conference on Colour in Graphics, Imaging and Vision (CGIV 2004)
local.citation.publicationNameSecond European Conference on Colour in Graphics, Imaging and Vision (CGIV 2004)

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