Color balancing filters using liquid crystal for image pickup

Jun Yonai, Hideo Fujikake, Tahito Aida, Hiroshi Kikuchi, Masahiro Kawakita, Kuniharu Takizawa, Kenichi Iwashita, Shinya Umeda

Research output: Contribution to journalArticlepeer-review

Abstract

In order to correct the color deviation due to variation of illumination in film shooting, a liquid-crystal filter with dichroic dyes that can control the color temperature of the transmitted light in real time has been developed. By using Planck's radiation rule and the Lambert-Beer law, the absorption spectra of the dyes are designed. It is found that the color balance can be adjusted continuously between 4450 and 2530 K. The time needed for control is about 80 ms. When a liquid-crystal filter is used for actual television film shooting, it is confirmed that the color balance of the image can be corrected naturally. The present device is useful in location film shooting for television when the color temperature of the image changes drastically under such conditions as the lighting changing from indoor light to solar light.

Original languageEnglish
Pages (from-to)40-48
Number of pages9
JournalElectronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi)
Volume84
Issue number10
DOIs
Publication statusPublished - 2001 Nov 1
Externally publishedYes

Keywords

  • Color balancing filter
  • Dichroic dye
  • Image
  • Liquid crystal

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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