The Research of Uniformchromaticity Property of Color Spaces, used in Avionics Equipment

I. O. Zharinov, Assistant Professor, Chef of Department, Saint Petersburg National Research University of Information Technologies, Mechanics and Optics (University ITMO), Chef of learning-scientists center, SPb Scientific Design Bureau "Electroavtomatica" n. a. P. A. Efimov, e-mail: igor_rabota@pisem.net, O. O. Zharinov, Assistant Professor, Saint-Petersburg State University of Aerospace Equipment

The problem of the research of uniformchromaticity property of color spaces, used in avionics equipment, is considered. Uniformchromaticity property of color spaces is decisive for calculation of quantitative measure of colors difference. Development of functional software for avionics indication equipment is based on color spaces, with graphical representation on XY- and UV-chromaticity planes. In according with modern standards (manuals R 52324—2005, R 52870—2007) it is recommended to use the coordinate system, based on UV-plane, as uniformchromatical one. Histograms of chromaticity coordinates distribution, obtained for both XY- and UV-planes by the use of mathematical modeling, are presented. There was established that chromaticity coordinates distributions on both planes significantly differ from uniform law. Taking this into account, both of considered color spaces can not be accepted as true uniform colour spaces, and hence, an estimation of colors difference value won't keep constant accuracy within the whole area of XY- and UV- chromaticity planes. Significant nonuniformity of chromaticity coordinates may be observed in every part of defined chromaticity area of XY-plane. For UV-plane, nonuniformity areas tend to be close to white color point and also concentrated along the lines drawn between points of some colors, namely: white-magenta, white-yellow, white-sky blue. Areas of non-equal contrast on UV-chromaticity plane were localized during the research.

Keywords: color spaces, on-board indication equipment, avionics, uniformchromaticity property

pp. 35–43