Toward a production-line classification of metallic satin-finished surfaces using coherent light

Yuri Lopez de Meneses; Gregoire Meylan; Florent Monay; Jacques Jacot

doi:10.1117/12.467515

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18 October 2002 Toward a production-line classification of metallic satin-finished surfaces using coherent light

Yuri Lopez de Meneses, Gregoire Meylan, Florent Monay, Jacques Jacot

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Proceedings Volume 4902, Optomechatronic Systems III; (2002) https://doi.org/10.1117/12.467515
Event: Optomechatronic Systems III, 2002, Stuttgart, Germany

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.

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Yuri Lopez de Meneses, Gregoire Meylan, Florent Monay, and Jacques Jacot "Toward a production-line classification of metallic satin-finished surfaces using coherent light", Proc. SPIE 4902, Optomechatronic Systems III, (18 October 2002); https://doi.org/10.1117/12.467515

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