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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 14 — May. 10, 2001
  • pp: 2275–2281

Automatic color-temperature compensator with guest–host liquid-crystal filter for video image sensing

Hideo Fujikake, Jun Yonai, Hiroto Sato, Hiroshi Kikuchi, Yoshiki Iino, Masahiro Kawakita, Yuzuru Tsuchiya, Kenichi Iwashita, and Shinya Umeda  »View Author Affiliations


Applied Optics, Vol. 40, Issue 14, pp. 2275-2281 (2001)
http://dx.doi.org/10.1364/AO.40.002275


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Abstract

A color-temperature compensating system with an electrically controllable liquid-crystal filter and a color sensor mounted on a video camera has been developed for color image sensing. The filter contains two guest–host liquid-crystal devices with dichroic dyes that have strong light absorption for shorter-wavelength light; two devices are necessary because of the spectral difference between the sun and an incandescent lamp as light sources. The filter’s absorption is continuously controlled by the voltage applied to the filter. Because the filter is driven according to spectral information about the illumination detected by the color sensor, the color balance of the video image to be sensed can be compensated automatically and rapidly. This is especially useful for video image shooting in which a video camera experiences changes in illumination color temperatures.

© 2001 Optical Society of America

OCIS Codes
(100.1930) Image processing : Dichroism
(110.2970) Imaging systems : Image detection systems
(110.3000) Imaging systems : Image quality assessment
(120.2440) Instrumentation, measurement, and metrology : Filters
(230.2090) Optical devices : Electro-optical devices
(230.3720) Optical devices : Liquid-crystal devices

History
Original Manuscript: September 6, 2000
Revised Manuscript: January 30, 2001
Published: May 10, 2001

Citation
Hideo Fujikake, Jun Yonai, Hiroto Sato, Hiroshi Kikuchi, Yoshiki Iino, Masahiro Kawakita, Yuzuru Tsuchiya, Kenichi Iwashita, and Shinya Umeda, "Automatic color-temperature compensator with guest–host liquid-crystal filter for video image sensing," Appl. Opt. 40, 2275-2281 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-14-2275


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References

  1. J. Yonai, H. Fujikake, T. Aida, H. Kikuchi, M. Kawakita, K. Takizawa, K. Iwashita, S. Umeda, “Color balancing filters using liquid crystal for image pickup,” Trans. Inst. Electron. Inf. Commun. Eng. J83-C, 415–421 (2000).
  2. G. H. Heilmeir, L. A. Zanoni, “Guest–host interactions in nematic liquid crystals: a new electro-optic effect,” Appl. Phys. Lett. 13, 91–92 (1968). [CrossRef]
  3. H. Seki, T. Uchida, Y. Shibata, “Dichroic dyes for guest–host liquid-crystal cells,” Mol. Cryst. Liq. Cryst. 138, 349–365 (1986). [CrossRef]
  4. T. Uchida, H. Seki, C. Shishido, M. Wada, “Guest–host interactions in nematic liquid crystals with negative dielectric anisotropy,” IEEE Trans. Electron Devices ED-26, 1373–1374 (1979). [CrossRef]
  5. T. Uchida, H. Seki, C. Shishido, M. Wada, “Bright dichroic guest–host LCDs without a polarizer,” Proc. Soc. Inf. Disp. 22, 41–46 (1981).
  6. P. Sheng, “Introduction to the elastic continuum theory of liquid crystals,” RCA Rev. 35, 408–432 (1974).
  7. F. C. Frank, “On the theory of liquid crystals,” Discuss. Faraday Soc. 25, 19–28 (1958). [CrossRef]

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