article

Automated knot detection for high speed computed tomography on Pinus sylvestris L. and Picea abies (L.) Karst. using ellipse fitting in concentric surfaces

Authors:

Erik Johansson,

Dennis Johansson,

Magnus FredrikssonAuthors Info & Claims

Computers and Electronics in Agriculture, Volume 96

Pages 238 - 245

https://doi.org/10.1016/j.compag.2013.06.003

Published: 01 August 2013 Publication History

Abstract

High speed industrial computed tomography (CT) scanning of sawlogs is new to the sawmill industry and therefore there are no properly evaluated algorithms for detecting knots in such images. This article presents an algorithm that detects knots in CT images of logs by segmenting the knots with variable thresholds on cylindrical shells of the CT images. The knots are fitted to ellipses and matched between several cylindrical shells. Parameterized knots are constructed using regression models from the matched knot ellipses. The algorithm was tested on a variety of Scandinavian Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) with a knot detection rate of 88-94% and generating about 1% falsely detected knots.

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Cited By

Larsson MIjiri TYoshida HHuber JFredriksson MBroman OIgarashi T(2022)Procedural texturing of solid wood with knotsACM Transactions on Graphics10.1145/3528223.353008141:4(1-10)Online publication date: 22-Jul-2022
https://dl.acm.org/doi/10.1145/3528223.3530081
Krähenbühl AKerautret BFeschet F(2015)Knot Detection from Accumulation Map by Polar ScanProceedings of the 17th International Workshop on Combinatorial Image Analysis - Volume 944810.1007/978-3-319-26145-4_26(352-362)Online publication date: 24-Nov-2015
https://dl.acm.org/doi/10.1007/978-3-319-26145-4_26

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Published In

cover image Computers and Electronics in Agriculture

Computers and Electronics in Agriculture Volume 96, Issue

August, 2013

251 pages

ISSN:0168-1699

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Copyright © Elsevier B.V. © 2013.

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Elsevier Science Publishers B. V.

Netherlands

Publication History

Published: 01 August 2013

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Cited By

Larsson MIjiri TYoshida HHuber JFredriksson MBroman OIgarashi T(2022)Procedural texturing of solid wood with knotsACM Transactions on Graphics10.1145/3528223.353008141:4(1-10)Online publication date: 22-Jul-2022
https://dl.acm.org/doi/10.1145/3528223.3530081
Krähenbühl AKerautret BFeschet F(2015)Knot Detection from Accumulation Map by Polar ScanProceedings of the 17th International Workshop on Combinatorial Image Analysis - Volume 944810.1007/978-3-319-26145-4_26(352-362)Online publication date: 24-Nov-2015
https://dl.acm.org/doi/10.1007/978-3-319-26145-4_26

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