doi: 10.17586/2226-1494-2015-15-5-831-838


RESEARCH OF NIGHT LIGHT EFFECTS ON COLORIMETRIC CHARACTERISTICS OF IMAGE PERCEIVED BY THE PILOT IN AN AIRCRAFT COCKPIT

I. O. Zharinov, O. O. Zharinov


Read the full article  ';
Article in Russian

For citation: Zharinov I.O., Zharinov O.O.. Research of night light effects on colorimetric characteristics of image perceived by the pilot in an aircraft cockpit. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2015, vol. 15, no. 5, pp. 831–838.

Abstract

Subject of Research. The influence of radiation spectra from the source of artificial night light on colorimetric characteristics of image perceived by the pilot in the aircraft cockpit has been studied. The image is displayed on the LCD screen of multifunctional color indication equipment unit. Night illumination of the cockpit is performed with the use of artificial lamps of red, green, blue and, rarely, white light. Method. Any given color to be displayed on the screen is perceived by an observer differently with presence and absence of external illumination. When external light of white color is used, perceived color depends upon color temperature of the light source; if illumination source has any arbitrary spectral characteristics, then perceivable color depends upon whole spectral content of the used source. The color, perceived by an observer, is formed as the mixture of the color displayed on the screen (image element color) with the color presented by diffuse reflection of external illumination source from the surface of the screen. The brightness of both colors is added. Mathematical expressions, that define calculation rule for chromaticity coordinates of color perceived by an observer, are based on the Grassmann’s law of additive color mixing. Quantitative analysis of the effect, caused by radiation spectra from an external source of artificial light on color gamut area, corresponding to image, perceived by an observer, has been performed through simulation in MathCad 15.0. Main Results. It was shown, that the color palette of on-board indication equipment, obtained on automated working place for any preset source of external illumination of fluorescent spectrum, corresponding to white light, is not usable correctly in the aircraft night flight mode. An observer loses ability to perceive properly saturated primary colors of red and blue in the case of green-blue light source of external illumination; and the same issue occurs with green and blue for red light source. Using of sources with high illumination level of “warm” white color causes significant shift of the colors perceived by an observer, from the area of saturated blue and green colors in the direction towards the white point defined by illumination source. Using the sources with high illumination level of smooth white color and also with the white color, which white point coordinates coincide with the white point coordinates the color gamut triangle of the tested screen, lead to offset of colors, perceived by an observer, equally for each primary color (red, green, blue) and yellow, cyan and magenta as well. And finally, dealing with sources with high illumination level of “cold” white color, significant offset of colors, perceived by an observer, occurs; those seeming colors are drifting from the area of saturated red and green colors in the direction towards the white point defined by illumination source. Practical Relevance. The results are usable by developers of indication equipment and the manufacturers of LCD panels for colorimetric calculations with account of an influence of external illumination with various spectral content on the screen.v


Keywords: indication, chromaticity coordinates, external illumination, color gamut.

References
1. Zharinov I.O., Zharinov O.O. Bortovye Sredstva Otobrazheniya Informatsii na Ploskikh Zhidkokristallicheskikh Panelyakh [On-Board means of information display on flat liquid-crystal panels]. St. Petersburg, SPbSUAI Publ., 2005, 144 p.
2. Gref P., Khul'tse Kh.G. Tekhnologii adaptivnogo izmeneniya yarkosti zadnei podsvetki televizionnykh ZhKekranov [Adaptive technology of brightness change of the TV LCD backlight]. Elektronnye Komponenty, 2008, no. 3, pp. 70–76.
3. Dyatlov V.M. Razrabotka i issledovanie konstruktsii steklopaketa zhidkokristallicheskogo ekrana [Construction and investigation of LCD screen glass]. Nauchno-Tekhnicheskii Vestnik Voennaya Elektronika i Elektrotekhnika, 2010, no. 62, pp. 270–279.
4. Vysotskii V., Bautkin V. Uluchshenie opticheskikh svoistv zhidkokristallicheskikh panelei [Improvement of optical properties of liquid crystal panels]. Sovremennaya Elektronika, 2009, no. 8, pp. 22–25.
5. Zaitsev A. Trebovaniya i ispytaniya TFT-modulei NEC Electronics, rabotayushchikh v zhestkikh usloviyakh ekspluatatsii [Requirements and test TFT-modules NEC Electronics, operating in harsh environments]. Komponenty i Tekhnologii, 2007, no. 72, pp. 16–20.
6. Indutnyy I.Z., Shepeliavyi P.E., Michailovskaya E.V., Park C.W., Lee J.B., Do Y.R. Gradient light-absorbing SiOx/Me coatings for display panels. Technical Physics, 2002, vol. 47, no. 6, pp. 720–725. doi: 10.1134/1.1486195
7. Kostishin M.O., Zharinov I.O., Zharinov O.O. Visual characteristics of displaying air navigation parameters and geoinformation data in avionics. Informatsionno-Upravlyayushchie Sistemy, 2014, no. 4, pp. 61–67. (In Russian)
8. Sinyak M. Vliyanie vneshnego osveshcheniya na prinyatie otsenochnogo resheniya o kachestve poligraficheskikh ottiskov [Influence of ambient light on decision about the quality evaluation of polygraphic prints]. Komp'yuArt, 2008, no. 5, pp. 38–45.
9. Sinyak M. Tsvet kak kriterii otsenki [Color as a criterion]. Mir Etiki, 2006, no. 3, pp. 52–56.
10. Belov N.P. Yaskov A.D., Grisimov V.N. Laboratory spectrometer for investigation of reflectance and estimation of coloration parameters of diffusely reflecting objects. Izvestiya vysshikh uchebnykh zavedeniy. Priborostroenie, 2010, vol. 53, no. 7, pp. 74–78. (In Russian)
11. Zharinov I.O., Zharinov O.O. Research of properties of an assessment of the resolution of Grassmann''s transformation in chromaticity coding systems, applied in avionic equipment. Programmnaya Inzheneriya, 2014, no. 8, pp. 40–47. (In Russian)
12. Gariutin I.A. Development of a similarity criterion for color characteristics of gas discharge metal-halide lamps. Izvestiya vysshikh uchebnykh zavedeniy. Priborostroenie, 2013, vol. 56, no. 3, pp. 71–75. (In Russian)
13. Kostishin M.O., Zharinov I.O. Issledovanie opticheskikh parametrov bortovykh sredstv indikatsii geoinformatsionnykh dannykh [Investigation of the optical parameters of airborne display of geospatial data]. Vestnik Cherepovetskogo Gosudarstvennogo Universiteta, 2014, no. 2-55, pp. 5–9.
14. Zharinov I.O., Zharinov O.O., Paramonov P.P., Kostishin M.O., Sudarchikov S.A. Principles of automatic system design for control over thermal and lighting characteristics of airborne indication means. Izvestiya vysshikh uchebnykh zavedeniy. Priborostroenie, 2014, vol. 57, no. 12, pp. 34–38. (In Russian)
15. Barber S., Dunbar L.L., Hardin D., Seah K. Aeronautical Chart Display Apparatus and Method. Patent US, no. 7417641, 2008.
16. Kumar S.V., Ramana P.V. Color selection algorithm design for smart lighting application. International Journal of Computer Science and Information Technology & Security, 2014, vol. 4, no. 1, pp. 8–13.
17. Gatchin Y.A., Zharinov I.O., Korobeynikov A.G., Zharinov O.O. Theoretical estimation of Grassmann’s transformation resolution in avionics color coding systems. Modern Applied Science, 2015, vol. 9, no. 5, pp. 197–210. doi: 10.5539/mas.v9n5p197


Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Copyright 2001-2024 ©
Scientific and Technical Journal
of Information Technologies, Mechanics and Optics.
All rights reserved.

Яндекс.Метрика