A method to estimate correlated color temperatures of illuminants using a color video camera

Author

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

Author_Institution

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

Volume

40

Issue

1

fYear

1991

fDate

2/1/1991 12:00:00 AM

Firstpage

28

Lastpage

33

Abstract

An indirect method of estimating light source color or the correlated color temperature of illuminants is proposed. It incorporates a color video camera with fixed white balance, a set of known color chips, and a desktop microcomputer. The correlated color temperature of the light source illuminating the color chips is estimated. The mathematical method used is the estimation of functions to be integrated from several values of the definite integrations. These values, which are measurable, are given as the output of the color video camera under different conditions. By means of the method of least squares, estimation accuracies of from 0.1 to 1.4% of the correlated color temperature are achieved. The accuracy achieved depends on the spectral distribution of the illuminants, except for illuminants like fluorescent lamps

Keywords

colorimetry; computerised instrumentation; lamps; least squares approximations; light sources; microcomputer applications; temperature measurement; chromaticity characteristics; color chips; color video camera; correlated color temperatures; desktop microcomputer; fluorescent lamps; illuminants; least squares; light source color; spectral distribution; Cameras; Fluorescent lamps; Least squares approximation; Light sources; Measurement standards; Microcomputers; Photometry; Semiconductor device measurement; Temperature distribution; Wavelength measurement;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.69944

Filename

69944