Electrical impedance and image analysis methods in detecting and measuring Scots pine heartwood from a log end during tree harvesting

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http://hdl.handle.net/10138/320300

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Raatevaara , A , Korpunen , H , Tiitta , M , Tomppo , L , Kulju , S , Antikainen , J & Uusitalo , J 2020 , ' Electrical impedance and image analysis methods in detecting and measuring Scots pine heartwood from a log end during tree harvesting ' , Computers and Electronics in Agriculture , vol. 177 , 105690 . https://doi.org/10.1016/j.compag.2020.105690

Title: Electrical impedance and image analysis methods in detecting and measuring Scots pine heartwood from a log end during tree harvesting
Author: Raatevaara, Antti; Korpunen, Heikki; Tiitta, Markku; Tomppo, Laura; Kulju, Sampo; Antikainen, Jukka; Uusitalo, Jori
Contributor: University of Helsinki, Doctoral Programme in Sustainable Use of Renewable Natural Resources
University of Helsinki, Department of Forest Sciences
Date: 2020-10
Language: eng
Number of pages: 10
Belongs to series: Computers and Electronics in Agriculture
ISSN: 0168-1699
URI: http://hdl.handle.net/10138/320300
Abstract: Scots pine (Pinus sylvestris L.) heartwood is naturally durable wood material which has not been fully utilized in the wood industry. Currently, there are no practical measurement methods for detecting and measuring heartwood in a tree harvesting. The objective of this study was to evaluate the applicability of an electrical impedance spectroscopy and an image analysis of a log end face for pine heartwood measurements from the harvesting perspective. Both methods were tested with a fresh wood material which was collected during the harvesting operations. The results indicate that both methods have potential to measure the heartwood from processed stems with an average heartwood diameter error being less than two centimeters for each method. However, the image analysis of the log end face is only appropriate when visible contrast between the heartwood and a sapwood exists. Our findings indicate that the studied heartwood detection methods show great potential in measuring the heartwood of the stem in the harvesting phase which would ideally benefit later links in wood value chains.
Subject: Scots pine heartwood
Image analysis
Region growing
KNN-matting
Electrical impedance
SPECTROSCOPY
SYLVESTRIS
STEMS
113 Computer and information sciences
4112 Forestry
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