Range camera on conveyor belts: estimating size distribution and systematic errors due to occlusion
1999 (English)In: Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X, E-ISSN 1996-756X, Vol. 118, 118-126 p.Article in journal (Refereed)
When range cameras are used for analyzing irregular material on a conveyor belt there will be complications such as missing segments caused by occlusion. Also, a number of range discontinuities will be present. In the framework towards stochastic geometry, conditions are found for the cases when range discontinuities take place. The test objects 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.
Place, publisher, year, edition, pages
1999. Vol. 118, 118-126 p.
Research subject Industrial Electronics
IdentifiersURN: urn:nbn:se:ltu:diva-39675DOI: 10.1117/12.370252Local ID: e83ebd20-adc2-11de-8293-000ea68e967bOAI: oai:DiVA.org:ltu-39675DiVA: diva2:1013191
Conference on Three-Dimensional Imaging, Optical Metrology, and Inspection : 19/09/1999 - 20/09/1999
Godkänd; 1999; Bibliografisk uppgift: Volumne: 3835; 20090930 (ysko); Konferensartikel i tidskrift2016-10-032016-10-03Bibliographically approved