live knot

intergrown knot, live knot

A knot whose growth rings are intergrown with the surrounding wood.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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The following 10 defect categories were considered, plus clear wood: birds eye & freckle, bark & pitch pockets, wane, split, blue stain, stain, pith, dead knot, live knot, and hole.
Each board face was manually labeled, according to its largest defect, into one of the following 10 categories: birds eye & freckle, bark & pitch pockets, wane, split, blue stain, stain, pith, dead knot, live knot, and hole (Fig.
The reduced database contained 1,400 samples of the categories birds eye & freckle, wane, split, blue stain, pith, dead knot, live knot and hole; but for classification purposes dead knots and live knots were merged into one category: knots.
Live knots are continuous with the wood surface and don't really affect the strength of the timber and add a bit of character to the timber.
The latter model was used to estimate knot rake for logs in the 5- to 10-inch-diameter range (12.7 to 25.4 cm) containing live knots larger than 2 inches (50.8 mm), or dead knots larger than 1 inch (25.4 mm), and for logs 11 to 20 inches in diameter (27.9 to 50.8 cm) that contained live knots larger than 3 inches (76.2 mm) or dead knots larger than 2 inches (50.8 mm).
The change in quality over time associated with branches can be thought of as a step function where knot-free straight-grained (clear) wood is the best quality and wood containing dead loose (black) knots or holes is considered the worst quality (i.e., clear wood > live knots > tight dead knots > loose black knots or knot holes) (Barbour et al.
This in turn creates a smaller knot cross section when crosscut, and together with the more lenient requirements for live knots, produces higher grades.
The FMMIS method was applied to a set of 900 images of radiata pine boards, which included samples from the following 10 categories of defects: birdseye and freckle, bark and pitch pockets, wane, splits, blue stain, stain, pith, dead knots, live knots, and holes.
Each image was manually labeled according to its largest defect, into one of the following 10 defect categories: birdseye and freckle, bark and pitch pockets, wane, splits, stain, blue stain, pith, dead knots, live knots, and holes.
Defect category TP FN FP TN TP FP ARR Time (%) (sec.) Birdseye and freckle 219 20 12 99 91.6 10.8 90.3 0.12 Bark and pitch pockets 34 0 3 112 100.0 2.6 95.3 0.07 Wane 34 0 11 97 100.0 10.2 100.0 0.15 Splits 40 0 18 134 100.0 11.8 90.6 0.11 Stain 40 5 9 103 88.9 8.0 84.9 0.21 Blue stain 46 5 5 65 90.2 7.1 88.2 0.13 Pith 30 0 6 137 100.0 4.2 99.8 0.13 Dead knots 37 1 3 176 97.4 1.7 99.3 0.08 Live knots 43 0 6 140 100.0 4.1 97.1 0.08 Holes 42 0 0 158 100.0 0.0 98.3 0.06 Global (10 categories) 565 31 73 1221 95 6 94.4 0.11 [+ or -] 0.04
A study of the live knots of pine showed that the density of knot wood was considerably higher than that of clear wood.