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Proceedings Paper

Toward a production-line classification of metallic satin-finished surfaces using coherent light
Author(s): Yuri Lopez de Meneses; Gregoire Meylan; Florent Monay; Jacques Jacot
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Paper Abstract

Some manufacturing processes, such as satin finish on stainless steel parts for the watchmaking and biomedical industries, apply purely aesthetic, global criteria for their quality control. This control is currently performed by human operators, and is found to be subjective, due to variability in operator judgement. This project aims to develop a device for automatic, production-line classification of satin finish according to the aesthetic criteria currently applied in the watchmaking industry. We exploit two coherent light phenomena to produce features to classify the parts into the same classes indicated by human operators. The analysis of the optical Fourier transform and the scattering pattern are used to generate high-dimensional feature vectors for their subsequent classification. The vectors, corresponding to different regions of the part surface, are classified using Principal Component Analysis and Kohonen networks. Experimental results show that both optical phenomena provide features capable of discriminating between conforming and nonconforming parts. Classification is simple enough to afford an inspection in under 1 s and its robustness has also been verified. We have thus completed a first step towards a simple, production-line device capable of providing an automatic, objective evaluation based on aesthetic quality criteria.

Paper Details

Date Published: 18 October 2002
PDF: 10 pages
Proc. SPIE 4902, Optomechatronic Systems III, (18 October 2002); doi: 10.1117/12.467515
Show Author Affiliations
Yuri Lopez de Meneses, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Gregoire Meylan, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Florent Monay, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Jacques Jacot, Ecole Polytechnique Federale de Lausanne (Switzerland)


Published in SPIE Proceedings Vol. 4902:
Optomechatronic Systems III
Toru Yoshizawa, Editor(s)

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