A method to estimate correlated color temperature of illuminant using color video camera

Author

Abe, Masato ; Ikeda, Hiroaki ; Higaki, Yasuhiko ; Amano, Minami ; Nakamichi, Matsuroh

Author_Institution

Dept. of Electron. Eng., Chiba Univ., Japan

fYear

1989

fDate

25-27 Apr 1989

Firstpage

19

Lastpage

23

Abstract

The authors describe a novel, indirect method for estimating the correlated color temperature of illuminants by using a color video camera and a set of several known color chips. The video camera can have arbitrary shooting chromaticity characteristics; however, it should be used in fixed white balance. The correlated color temperature of the light source illuminating the color chips is estimated. Using the method of least squares, an accuracy from 0.1% to 1.4% is achieved, depending on the spectral distribution of the illuminants. The method fully utilizes microcomputer capabilities in acquiring the camera outputs, solving a set of simultaneous linear equations, and searching for the nearest (U, ν) coordinate values on the black-body locus

Keywords

calibration; colorimetry; computerised instrumentation; computerised picture processing; least squares approximations; light sources; measurement standards; microcomputer applications; temperature measurement; arbitrary shooting chromaticity characteristics; black-body locus; color chips; color video camera; computerised picture processing; correlated color temperature; least squares; light source; microcomputer; simultaneous linear equations; spectral distribution; Cameras; Equations; Lamps; Least squares methods; Light sources; Production facilities; Reflectivity; Semiconductor device measurement; Temperature distribution; Wavelength measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference, 1989. IMTC-89. Conference Record., 6th IEEE

Conference_Location

Washington, DC

Type

conf

DOI

10.1109/IMTC.1989.36813

Filename

36813