COLOR CONTROL

Color features for quality control in ceramic tile industry

[+] Author Affiliations
Saku Kukkonen, Heikki Kälviäinen

Lappeenranta University of Technology, Department of Information Technology, P.O. Box 20, FIN-53851?Lappeenranta, Finland E-mail: heikki.kalviainen@lut.fi

Jussi Parkkinen

University of Joensuu, Department of Computer Science, P.O. Box 111, FIN-80101?Joensuu, Finland

Opt. Eng. 40(2), 170-177 (Feb 01, 2001). doi:10.1117/1.1339877
History: Received Dec. 14, 1999; Revised Aug. 7, 2000; Accepted Aug. 8, 2000
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We study visual quality control in the ceramics industry. In tile manufacturing, it is important that in each set of tiles, every single tile looks similar. Currently, the estimation is usually done by human vision. Our goal is to design a machine vision system that can estimate the sufficient similarity, or same appearance, to the human eye. Our main approach is to use accurate spectral representation of color, and compare spectral features to the RGB color features. A laboratory system for color measurements is built. Experimentations with five classes of brown tiles are presented and discussed. In addition to the k-nearest neighbor (k-NN) classifier, a neural network called the self-organizing map (SOM) is used to provide understanding of the spectral features. Every single spectrum in each tile of a training set is used as input to a 2-D SOM. The SOM is analyzed to understand how spectra are clustered. As a result, tiles are classified using a trained 2-D SOM. It is also of interest to know whether the order of spectral colors can be determined. In our approach, all spectra are clustered in a 1-D SOM, and each pixel (spectrum) is presented by pseudocolors according to the trained nodes. Finally, the results are compared to experiments with human vision. © 2001 Society of Photo-Optical Instrumentation Engineers.

© 2001 Society of Photo-Optical Instrumentation Engineers

Citation

Saku Kukkonen ; Heikki Kälviäinen and Jussi Parkkinen
"Color features for quality control in ceramic tile industry", Opt. Eng. 40(2), 170-177 (Feb 01, 2001). ; http://dx.doi.org/10.1117/1.1339877


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