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Proceedings Paper

Multisource and color lighting for detection of small protuberance
Author(s): Denis Brunet; Thierry Pun
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Paper Abstract

In typical machine vision problems such as quality control or object location, it is often the case that elements of interest are small protuberances over a surface. We present an innovative and robust approach aiming at detecting such protuberances. Its basic ideas are to detect the shadows produced by the protuberances and to use several light sources simultaneously to enhance detection. Each light source produces a different set of shadows; combining the shadows produced by all light sources helps to locate the protuberance, because these shadows are the only significantly varying patterns between views. Rather than using several white light sources in sequence, it is possible to use simultaneous color sources with appropriate filters to separate the image into independent channels. The approach has been validated on a concrete problem with highly variable protuberances and nonplanar surfaces. The results confirm the robustness of this approach, which could be used for other problems as well.

Paper Details

Date Published: 1 March 1992
PDF: 12 pages
Proc. SPIE 1614, Optics, Illumination, and Image Sensing for Machine Vision VI, (1 March 1992); doi: 10.1117/12.57967
Show Author Affiliations
Denis Brunet, Univ. of Geneva (Switzerland)
Thierry Pun, Univ. of Geneva (Switzerland)

Published in SPIE Proceedings Vol. 1614:
Optics, Illumination, and Image Sensing for Machine Vision VI
Donald J. Svetkoff, Editor(s)

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