IMAGING

Color measurement in standard CIELAB coordinates using a 3CCD camera: correction for the influence of the light source

[+] Author Affiliations
Montse Corbala´n

Escuela Universitaria Polite´cnica de Manresa, Dpt. de Electro´nica, Manresa?08240, Barcelona, Spain

Marı´a S. Milla´n

Escuela Universitaria de Optica y Optometri´a de Terrassa, Dpt. de Optica y Optometri´a, Terrassa?08222, Barcelona, Spain

Marı´a J. Yzuel

Universidad Auto´noma de Barcelona, Dpt. de Fi´sica, Bellaterra?08193, Barcelona, Spain

Opt. Eng. 39(6), 1470-1476 (Jun 01, 2000). doi:10.1117/1.602519
History: Received Mar. 18, 1999; Revised Nov. 17, 1999; Accepted Nov. 30, 1999
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Abstract

We have analyzed the accuracy of the compensating performance of the white-balance mechanism of a 3CCD camera for the three common types of light—fluorescent (F), incandescent (I), and daylight (D). We study the behavior of the camera using the RGB and CIELAB coordinates for a wide set of color samples covering the visible spectrum. CIELAB coordinates are obtained from the tristimulus XYZ. Using linear methods, we obtain the XYZ values from the (RGB)CCD values acquired by a 3CCD camera. We propose two different approaches: the first is specific for each particular light source (F, I, and D); the second considers the equienergetic spectral light source as an approximation for white lighting. We measure the mean color difference in the CIELAB space under a change of illuminant and compare the results in order to evaluate the performance of the response of a 3CCD camera. The transformations that are specific for a given light source allow an improved response under change of illuminant in terms of color constancy. © 2000 Society of Photo-Optical Instrumentation Engineers.

© 2000 Society of Photo-Optical Instrumentation Engineers

Citation

Montse Corbala´n ; Marı´a S. Milla´n and Marı´a J. Yzuel
"Color measurement in standard CIELAB coordinates using a 3CCD camera: correction for the influence of the light source", Opt. Eng. 39(6), 1470-1476 (Jun 01, 2000). ; http://dx.doi.org/10.1117/1.602519


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