State estimation of the performance of gravity tables using multispectral image analysis

Michael A. E. Hansen, Ananda S. Kannan, Jacob Lund, Peter Thorn, Srdjan Sasic, Jens Michael Carstensen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


Gravity tables are important machinery that separate dense (healthy) grains from lighter (low yielding varieties) aiding in improving the overall quality of seed and grain processing. This paper aims at evaluating the operating states of such tables, which is a critical criterion required for the design and automation of the next generation of gravity separators. We present a method capable of detecting differences in grain densities, that as an elementary step forms the basis for a related optimization of gravity tables. The method is based on a multispectral imaging technology, capable of capturing differences in the surface chemistry of the kernels. The relevant micro-properties of the grains are estimated using a Canonical Discriminant Analysis (CDA) that segments the captured grains into individual kernels and we show that for wheat, our method correlates well with control measurements (R2 =0.93).
Original languageEnglish
Title of host publicationProceedings of 20th Scandinavian Conference on Image Analysis
Publication date2017
ISBN (Print)9783319591285
Publication statusPublished - 2017
Event20th Scandinavian Conference on Image Analysis - Tromsø, Norway
Duration: 12 Jun 201714 Jun 2017
Conference number: 20


Conference20th Scandinavian Conference on Image Analysis
Internet address
SeriesLecture Notes in Computer Science


  • Theoretical Computer Science
  • Computer Science (all)
  • CDA
  • Gravity tables
  • Multispectral imaging and state optimization
  • Discriminant analysis
  • Grain (agricultural product)
  • Imaging techniques
  • Machinery
  • State estimation
  • Surface chemistry
  • Canonical discriminant analysis
  • Control measurements
  • Grain processing
  • Gravity separator
  • Micro properties
  • Multi-spectral image analysis
  • Multispectral imaging
  • State optimization
  • Image analysis


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