Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
ILLUMINATION CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2004/088976
Kind Code:
A1
Abstract:
An illumination control device which ensures the long life of an LED and feedback-controls an illumination unit using the output signal of a light receiving element provided in association with the illumination unit to thereby keep a constant brightness. Or, an image picked up by a camera is image-processed to thereby calculate brightness on a screen and feedback-control an illumination unit so as to keep the brightness at a constant level. Alternatively, an illumination unit is feedback-controlled so as to keep a constant brightness based on a recognition rate when characters in a camera-shot image are recognized.

Inventors:
MURAKUMO MASASHI (JP)
NATORI HIROAKI (JP)
IKEDA OSAMU (JP)
MARUTA YUTAKA (JP)
IKEDA KUNIHIRO (JP)
HIDAKA SHINJI (JP)
SASAKI NOBUMASA (JP)
AMAMOTO TAMOTSU (JP)
NAKASHIMA HIROYUKI (JP)
Application Number:
PCT/JP2003/004076
Publication Date:
October 14, 2004
Filing Date:
March 31, 2003
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
FUJITSU LTD (JP)
MURAKUMO MASASHI (JP)
NATORI HIROAKI (JP)
IKEDA OSAMU (JP)
MARUTA YUTAKA (JP)
IKEDA KUNIHIRO (JP)
HIDAKA SHINJI (JP)
SASAKI NOBUMASA (JP)
AMAMOTO TAMOTSU (JP)
NAKASHIMA HIROYUKI (JP)
International Classes:
G01J1/42; G03B7/16; G03B7/28; G03B15/00; G03B15/02; G03B15/05; G03B17/18; H04N5/235; H04N5/238; (IPC1-7): H04N5/225
Foreign References:
JPH05219447A1993-08-27
JPH10261190A1998-09-29
JP2000306684A2000-11-02
JP2000338557A2000-12-08
Attorney, Agent or Firm:
Moizumi, Shuji (Takanawa 3-chome Minato-ku, Tokyo, JP)
Download PDF:
View/Download PDF      PDF Help



 
Previous Patent: METHODS AND APPARATUS FOR DYNAMICALLY SOFT PROOFING HALFTONE IMAGES

Next Patent: MONITORING SYSTEM