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Proceedings Paper

A Novel Method For Spatial Measurement Of Holes
Author(s): L. H. Bieman
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Paper Abstract

Accurately locating the three dimensional position of a hole is critical for many manufacturing applications of machine vision. A novel method for locating a hole combines the use of backlighting with structured light. The centroid of the image of the backlit hole defines a line in space along which the center of the actual hole must lie. The cross of structured light is then used to determine the plane( surface ) on which the hole is located. Hence, the intersection of the line and plane defines the three dimensional position of the hole in space. The strength of the approach is the large amount of data used to obtain both the line position and the plane location. Thus, the approach is robust and has good immunity to noise, unlike many pure structured light techniques. The approach is also unaffected by changes in the orientation of the hole. It avoids the difficult problem encountered in stereo vision of having to create good images from two different viewing angles.

Paper Details

Date Published: 22 January 1987
PDF: 7 pages
Proc. SPIE 0728, Optics, Illumination, and Image Sensing for Machine Vision, (22 January 1987); doi: 10.1117/12.937831
Show Author Affiliations
L. H. Bieman, Industrial Technology Institute (United States)

Published in SPIE Proceedings Vol. 0728:
Optics, Illumination, and Image Sensing for Machine Vision
Donald J. Svetkoff, Editor(s)

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