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Proceedings Paper

Quality control in tile production
Author(s): Heikki A. Kalviainen; Saku Kukkonen; Timo S. Hyvarinen; Jussi P. S. Parkkinen
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Paper Abstract

This work studies visual quality control in ceramics industry. In tile manufacturing, it is important that in each set of tiles, every single tile looks similar. For example, the tiles should have similar color and texture. Our goal is to design a machine vision system that can estimate the sufficient similarity or same appearance to the human eye. Currently, the estimation is usually done by human vision. Differing from other approaches our aim is to use accurate spectral representation of color, and we are comparing spectral features to the RGB color features. A laboratory system for color measurement is built. Experimentations with five classes of brown tiles are presented. We use chromaticity RGB features and several spectral features for classification with the k-NN classifier and with a neural network, called Self-Organizing Map. We can classify many of the tiles but there are several problems that need further investigations: larger training and test sets are needed, illuminations effects must be studied further, and more suitable spectral features are needed with more sophisticated classifiers. It is also interesting to develop further the neural approach.

Paper Details

Date Published: 6 October 1998
PDF: 11 pages
Proc. SPIE 3522, Intelligent Robots and Computer Vision XVII: Algorithms, Techniques, and Active Vision, (6 October 1998); doi: 10.1117/12.325782
Show Author Affiliations
Heikki A. Kalviainen, Lappeenranta Univ. of Technology (Finland)
Saku Kukkonen, Lappeenranta Univ. of Technology (Finland)
Timo S. Hyvarinen, SPECIM Spectral Imaging Ltd. (Finland)
Jussi P. S. Parkkinen, Lappeenranta Univ. of Technology (Finland)

Published in SPIE Proceedings Vol. 3522:
Intelligent Robots and Computer Vision XVII: Algorithms, Techniques, and Active Vision
David P. Casasent, Editor(s)

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