December 2010
Volume 10, Issue 15
Free
OSA Fall Vision Meeting Abstract  |   December 2010
Measurement of color matching functions with a compact and simple apparatus using LEDs
Author Affiliations
  • Yasuki Yamauchi
    Department of Informatics, Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata, Japan
  • Minoru Suzuki
    Department of Informatics, Yamagata University, Yonezawa, Yamagata, Japan
  • Taka-aki Suzuki
    Shizuoka Industrial Research Institute of Shizuoka Prefecture, Shizuoka, Shizuoka, Japan
  • Katsunori Okajima
    Research Institute of Environment and Information Sciences, Yokohama National University, Yokohama, Kanagawa, Japan
Journal of Vision December 2010, Vol.10, 65. doi:10.1167/10.15.65
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      Yasuki Yamauchi, Minoru Suzuki, Taka-aki Suzuki, Katsunori Okajima; Measurement of color matching functions with a compact and simple apparatus using LEDs. Journal of Vision 2010;10(15):65. doi: 10.1167/10.15.65.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: A conventional bipartite apparatus to measure color matching functions (CMFs) usually consists of plural optical paths; a path for a test stimulus consisted of three primaries, and that for the reference stimulus. The primaries should be presented to both optical paths, as "negative" light in the reference stimulus is sometimes required to complete color matching. Thus, the conventional apparatus should have plural light sources in each optical path and required complicated alignments. In order to realize a compact apparatus to measure CMFs, we developed a bipartite apparatus with time-controlled LED lights.

Method: We used a single light source, which consisted of plural LEDs inserted to a small integral sphere (4'' diameter). A beam splitter was used to divide the light into two optical paths. The optical path, which was delivered to a subject, was temporally switched alternatively. Its frequency was high enough for the observer not to detect the flicker of the lights. By changing the lighting timing of LEDs, it was possible to arbitrarily select any combinations of the LEDs to present in either the test or the reference stimulus area. Subjects adjusted the intensity of the test stimulus which was controlled by modulating the width of the driving pulse.

Results: We succeeded in building a compact apparatus that can present bipartite stimulus with a single light source by time-controlled of the LEDs. The results of the CMFs measured with this apparatus will be shown at the conference.

Acknowledgments
Supported partially by the Hoso Bunka Foundation and the Grant-in-Aid for Research Activity Start-up (21800006). 
References
Suzuki, T., Okada, Y., Yi, Q., Sakuragawa, S., Takayama, K., Okajima, K.(2008). Simple estimation method for age-related change of spectral luminous efficiency using LEDs. Proceedings of Interium Meeting of the International Colour Association(AIC), 38.
Wyszecki, G., Stiles, W. S.(1982). Color science: Concepts and methods, quantitative data and formulae. New York: Wiley.
Yamauchi, Y. et al.(2003). Measurement of color matching functions using a digital micro-mirror device. Fall Vision Meeting 2003, Journal of Vision, 3(12):66a.
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