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Proceedings Paper

Coherent processor for real-time inspection of technical surfaces
Author(s): Stephan Teiwes; Matthias Duerr; Mario Kreissl; Sven Krueger; Heiko Schwarzer
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Paper Abstract

The number of applications in product inspection is already large and grows rapidly. Fabrication processes run at high speeds, and demands on accuracy and quality are rising. Today, electronic vision system often do not provide enough processing performance to satisfy real-time requirements of industrial applications. This motivates the development of hybrid vision systems which, by utilization of parallel optical filtering, have enough processing power to become applicable in automated product inspection. We have developed a programmable optical processor which is designed to extract defects on technical surfaces by means of optical image analysis. The processor is capable of analyzing video image sequences in real-time using liquid-crystal spatial light modulator technology. Structural defects are visually enhanced by an adaptive wavelet filtering method. We have implemented a demonstrator device and showed its operation by an example of practical relevance. The experiments confirm that optical image processing is an attractive way to do quality control in real-time.

Paper Details

Date Published: 20 April 1998
PDF: 8 pages
Proc. SPIE 3292, Spatial Light Modulators, (20 April 1998); doi: 10.1117/12.305500
Show Author Affiliations
Stephan Teiwes, Berlin Institute of Optics (Switzerland)
Matthias Duerr, Berlin Institute of Optics (Germany)
Mario Kreissl, Berlin Institute of Optics (Germany)
Sven Krueger, Berlin Institute of Optics (Germany)
Heiko Schwarzer, Berlin Institute of Optics (Germany)

Published in SPIE Proceedings Vol. 3292:
Spatial Light Modulators
Richard L. Sutherland, Editor(s)

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