Title: Propagation of errors in chromaticity coefficients (x, y) obtained from spectroradiometric curves: tristimulus covariances included

Authors: H. Onusic, D. Mandic

Addresses: Departamento de Fisica Nuclear, Institute de Fisica, Universidade de Sao Paulo, Caixa Postal 20516, Sao Paulo, SP, Brazil. ' Engenharia Experimental, TMA, Volkswagen do Brasil S.A., Sao Bernardo do Campo, SP, Brazil

Abstract: The technique of propagation of errors developed by Onusic and Douglas to obtain uncertainty ellipses is applied to three specific colours (white, red and yellow) including the covariances of tristimulus values, Cov(Xi, Xj) which were evaluated through its proper definition within an experimental data set. The orientation and size of the ellipses were calculated and compared with ellipses without such terms. The results are applied to illumination and signal devices used with vehicles, in both CIE systems: 1931 (x, y) and 1960 (u, v).

Keywords: colourimetry; uncertainty ellipses; colour discrimination; error propogation; vehicle signal devices; tristimulus values; vehicle design; chromaticity coefficients.

DOI: 10.1504/IJVD.1989.061564

International Journal of Vehicle Design, 1989 Vol.10 No.1, pp.79 - 88

Published online: 26 May 2014 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article