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An algorithm for comparing density in CT-images taken before and after compression of Pinus sylvestris
Luleå tekniska universitet.
Högskolan Dalarna.
2005 (English)In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 63, no 1, p. 23-29Article in journal (Refereed) Published
Abstract [en]

Ten plain-sawn boards of Scots pine (Pinus sylvestris L.) were compressed semi-isostatically according to the CaLignum process in a Quintus press at 25°C and 140 MPa. X-ray computerised tomography images of the same cross-sections were captured before and after compression and compared using a transformation algorithm. In the algorithm the shape of compressed cross-sections were converted to the same shape as non-compressed using the density variation between pixels. Density after compression and the increase in density were analysed using PLS regression. The regressor variables described position in the cross-section and wood properties of each pixel. Heartwood and other resinous wood were less compressed than sapwood, particularly in boards with high resin content. Density also increased little close to the press table, especially in whorls with large knots. Higher original density gives lower degree of compression but still higher density after compression. © Springer-Verlag 2005

Place, publisher, year, edition, pages
2005. Vol. 63, no 1, p. 23-29
National Category
Other Mechanical Engineering
Research subject
Wood Technology
Identifiers
URN: urn:nbn:se:ltu:diva-5890DOI: 10.1007/s00107-004-0544-4Local ID: 41413260-0a0c-11dd-ae49-000ea68e967bOAI: oai:DiVA.org:ltu-5890DiVA: diva2:978766
Note
Validerad; 2005; 20080414 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-21Bibliographically approved

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