Determination of the change in appearance of lumber surfaces illuminated from various directions
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Abstract
Optical appearance is an important aesthetic property of wood, and this unique visual characteristic needs to be described quantitatively for many industrial applications. The objective of this study is to demonstrate the change in appearance of lumber surfaces from the viewpoint of human observation. Ten different specimens of coated and uncoated fancy veneer overlaid plywood of four species and solid and print Sugi (Japanese cedar) boards were prepared. For observation purposes, a simple goniophotometric device was constructed. A series of digital images of each specimen was taken, whereas the surface was illuminated from various lighting azimuths. The images were evaluated by subtraction, correlation, and multiresolution contrast analyses. The first two methods detect reflection anisotropy on the specimen surface through comparison of two images. Subtraction analysis also distinguishes between the coated and uncoated surfaces. However, it is difficult to determine the difference between the solid and print Sugi specimens based on these techniques. By contrast, multiresolution contrast analysis renders possible evaluation of the size and degree of the change in the surface appearances by contrast values. By comparing the contrast values for every lighting azimuth and filter size, this analysis clearly determines the change in appearance peculiar to wood, such as reflection anisotropy, improvement in reflectiveness conferred by coating, and the difference between the solid and print Sugi specimens.
©2010 by Walter de Gruyter Berlin New York
Articles in the same Issue
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- Thermal aging of 1-alkyl-3-methylimidazolium ionic liquids and its effect on dissolved cellulose
- Synchrotron X-ray fiber diffraction study on the thermal expansion behavior of cellulose crystals in tension wood of Japanese poplar in the low-temperature region
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- Surface properties of extracts from cork black condensate
- Effect of helium DBD plasma treatment on the surface of wood samples
- Preparation of thermoplastic molding from steamed Japanese beech flour
- Alteration of the unsteady sorption behaviour of maple (Acer pseudoplatanus L.) and spruce (Picea abies (L.) Karst.) due to thermal modification
- Towards improved understanding of PEG-impregnated waterlogged archaeological wood: A model study on recent oak
- Determination of the change in appearance of lumber surfaces illuminated from various directions
- A study of water exchange in wood by means of 2D NMR relaxation correlation and exchange
- Measurement of surface growth stress in Eucalyptus nitens Maiden by splitting a log along its axis
- Obituary
- Dion Chen-Loung Chen (1930–2009)
- Meetings
- Meetings
Articles in the same Issue
- Original Papers
- Recombinant manganese peroxidase (rMnP) from Pichia pastoris. Part 1: Kraft pulp delignification
- Recombinant manganese peroxidase (rMnP) from Pichia pastoris. Part 2: Application in TCF and ECF bleaching
- The role of hydroxyl and oxyl anion radicals in selectivity of oxygen delignification
- Thermal aging of 1-alkyl-3-methylimidazolium ionic liquids and its effect on dissolved cellulose
- Synchrotron X-ray fiber diffraction study on the thermal expansion behavior of cellulose crystals in tension wood of Japanese poplar in the low-temperature region
- Studies on the dehydrogenative polymerization of monolignol β-glycosides. Part 6: Monitoring of horseradish peroxidase-catalyzed polymerization of monolignol glycosides by GPC-PDA
- Reactivity of syringyl quinone methide intermediates in dehydrogenative polymerization. Part 2: pH effect in horseradish peroxidase-catalyzed polymerization of sinapyl alcohol
- Fractionation, analysis, and PCA modeling of properties of four technical lignins for prediction of their application potential in binders
- New model for predicting tensile strength and density of eucalyptus handsheets based on an activation parameter calculated from fiber distribution characteristics
- Extractives of the tropical wood wallaba (Eperua falcata Aubl.) as natural anti-swelling agents
- Surface properties of extracts from cork black condensate
- Effect of helium DBD plasma treatment on the surface of wood samples
- Preparation of thermoplastic molding from steamed Japanese beech flour
- Alteration of the unsteady sorption behaviour of maple (Acer pseudoplatanus L.) and spruce (Picea abies (L.) Karst.) due to thermal modification
- Towards improved understanding of PEG-impregnated waterlogged archaeological wood: A model study on recent oak
- Determination of the change in appearance of lumber surfaces illuminated from various directions
- A study of water exchange in wood by means of 2D NMR relaxation correlation and exchange
- Measurement of surface growth stress in Eucalyptus nitens Maiden by splitting a log along its axis
- Obituary
- Dion Chen-Loung Chen (1930–2009)
- Meetings
- Meetings
