Research of Influence of the External Illuminance on the Color Measurement Characteristics for Visually Percepted Image in Avionics Engineering

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

The problem is considered and research is performed for the software-based correction method dealing with digital codes of components of color palette that is using in on-board indication equipment. It is shown that color palette, obtained with the use of any given source of external illuminance that is mounted in automated workstation, can't be successfully used for all possible operating conditions when color temperature of external varying widely (from 2000 to 20 000 Kelvins). In order to display an image in varying conditions of external illuminance falling on the screen there was proposed the method and formulas allowing to correct digital codes of any given color palette. It is shown, that relations between brightness value of an image on LCD-panel and brightness of the color, caused by diffuse reflection of the light of external illuminance sourse, determine not only technique for calculation of the contrast value for any given image element, but also restricts color gamut, that person can visually percept.

Keywords: indication, avionics, chromaticity coordinates, external illuminance, correction

pp. 29–38