ADVANCES IN PATTERN RECOGNITION TECHNIQUES, DEVICES, AND ALGORITHMS

Color pattern recognition with CIELAB coordinates

[+] Author Affiliations
Montse Corbala´n

Escuela Universitaria Polite´cnica de Manresa, Department of Ingenieri´a Electro´nica, Manresa?E-08240, Barcelona, Spain E-mail: montserrat.corbalan@upc.es

Marı´a S. Milla´n

Escuela Universitaria de O´ptica y Optometri´a de Terrassa, Department of Optica y Optometri´a, Terrassa?E-08222, Barcelona, Spain

Marı´a J. Yzuel

Universidad Auto´noma de Barcelona, Department de Fi´sica, Bellaterra?E-08193, Barcelona, Spain

Opt. Eng. 41(1), 130-138 (Jan 01, 2002). doi:10.1117/1.1428295
History: Received May 31, 2001; Revised Aug. 29, 2001; Accepted Aug. 31, 2001
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A color pattern recognition system must identify a target by its shape and color distribution. In real situations, however, the color information is affected by changes of the light source (e.g., from indoor illumination to outdoor daylight), often making recognition impossible. In this work, we propose a color pattern recognition technique with tolerance for illumination changes within the common sources of white light. This can be accomplished using the coordinates of the CIELAB system, luminance (L), chroma (C), and hue (h) instead of the conventional RGB system. The proposal has some additional advantages: there is no need to store a matched filters base to analyze scenes captured under different light sources (one set of filters for each illuminant light source) and therefore the recognition process can be simplified; and in most cases, the contribution of only two channels (C and h) is enough to avoid false alarms in color pattern recognition. From the results, we show that the recognition system is improved when CIELAB coordinates are used. © 2002 Society of Photo-Optical Instrumentation Engineers.

© 2002 Society of Photo-Optical Instrumentation Engineers

Citation

Montse Corbala´n ; Marı´a S. Milla´n and Marı´a J. Yzuel
"Color pattern recognition with CIELAB coordinates", Opt. Eng. 41(1), 130-138 (Jan 01, 2002). ; http://dx.doi.org/10.1117/1.1428295


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