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, Shinya Umeda

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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 shorterwavelength 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.

Original languageEnglish
Pages (from-to)2275-2281
Number of pages7
JournalApplied optics
Issue number14
Publication statusPublished - 2001 May 10
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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