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Proceedings Paper

Range camera on conveyor belts: estimating size distribution and systematic errors due to occlusion
Author(s): Mats Blomquist; Ake V. Wernersson
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Paper Abstract

When range cameras are used for analyzing irregular material on a conveyor belt there will be complications like missing segments caused by occlusion. Also, a number of range discontinuities will be present. In a frame work towards stochastic geometry, conditions are found for the cases when range discontinuities take place. The test objects in this paper are pellets for the steel industry. An illuminating laser plane will give range discontinuities at the edges of each individual object. These discontinuities are used to detect and measure the chord created by the intersection of the laser plane and the object. From the measured chords we derive the average diameter and its variance. An improved method is to use a pair of parallel illuminating light planes to extract two chords. The estimation error for this method is not larger than the natural shape fluctuations (the difference in diameter) for the pellets. The laser- camera optronics is sensitive enough both for material on a conveyor belt and free falling material leaving the conveyor.

Paper Details

Date Published: 16 November 1999
PDF: 9 pages
Proc. SPIE 3835, Three-Dimensional Imaging, Optical Metrology, and Inspection V, (16 November 1999); doi: 10.1117/12.370252
Show Author Affiliations
Mats Blomquist, Lulea Univ. of Technology (Sweden)
Ake V. Wernersson, Lulea Univ. of Technology (Sweden)


Published in SPIE Proceedings Vol. 3835:
Three-Dimensional Imaging, Optical Metrology, and Inspection V
Kevin G. Harding, Editor(s)

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