OSA's Digital Library

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


View Full Text Article

Enhanced HTML    Acrobat PDF (1752 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

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

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited