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Proceedings Paper

Computer vision methods for the three-dimensional measurement of manufactured parts
Author(s): John T. Atkinson; Clifford Allan Hobson; Shirish P. Kshirsagar; Francis Lilley; Jeremy David Pearson
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Paper Abstract

This paper describes a non-contact system for surface shape measurement of manufactured parts. The technique consists of a coherent optical system combined with powerful parallel processing hardware, thus allowing rapid inspection rates to be realized. A `structured lighting' system is employed involving the projection of a multi-stripe fringe pattern onto the object surface thus enabling 3D data to be obtained. Phase measuring techniques are applied in order to increase accuracy and resolution. A comparison is made between two different phase measuring methodologies. These techniques require computationally intensive algorithms and processing of large amounts of image data. Image processing hardware should be fast enough to achieve results within a reasonable time scale. A parallel image processing system has been designed for such applications based on the Texas Instruments digital signal processor type TMS320C40. The system is based on MIMD message passing architecture and uses an EISA bus for the host interface. The issues of speed of data acquisition and processing, reliability and robustness of the technique and accuracy are discussed.

Paper Details

Date Published: 17 December 1993
PDF: 10 pages
Proc. SPIE 1989, Computer Vision for Industry, (17 December 1993); doi: 10.1117/12.164876
Show Author Affiliations
John T. Atkinson, Liverpool John Moores Univ. (United Kingdom)
Clifford Allan Hobson, Liverpool John Moores Univ. (United Kingdom)
Shirish P. Kshirsagar, Liverpool John Moores Univ. (United Kingdom)
Francis Lilley, Liverpool John Moores Univ. (United Kingdom)
Jeremy David Pearson, Liverpool John Moores Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 1989:
Computer Vision for Industry
Donald W. Braggins, Editor(s)

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