Image Analysis of Pellet Size for a Control System in Industrial Feed Production

Martin Georg Ljungqvist, Michael Engelbrecht Nielsen, Bjarne Kjær Ersbøll, Stina Frosch

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When producing aquaculture fish feed pellets, the size of the output product is of immense importance. As the production method cannot produce pellets of constant and uniform size using constant machine settings, there is a demand for size control. Fish fed with feed pellets of improper size are prone to not grow as expected, which is undesirable to the aquaculture industry. In this paper an image analysis method is proposed for automatic size-monitoring of pellets. This is called granulometry and the method used here is based on the mathematical morphological opening operation. In the proposed method, no image object segmentation is needed. The results show that it is possible to extract a general size distribution from an image of piled disordered pellets representing both length and diameter of the pellets in combination as an area.
Original languageEnglish
JournalP L o S One
Issue number10
Pages (from-to)e26492
Publication statusPublished - 2011

Bibliographical note

This is an Open Access article distributed under the terms of the Creative Commons Attribution-Noncommercial License 2.5, which permits unrestricted use, distribution, and reproduction in any noncommercial medium, provided the original work is properly cited.


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