MEASURING THE OUTER SHAPE OF PINUS-SYLVESTRIS SAW LOGS WITH AN X-RAY LOGSCANNER

The accuracy of measuring the outer shape of Scots pine (Pinus sylvest ris L.) saw logs with an X-ray LogScanner has been compared with the a ccuracy of using a 2-axis optical scanner, a S-axis optical scanner an d an ideal 3-D optical scanner. The different scanners were simulated using computed tomography (CT) data from the Swedish Stem Bank. The ou ter shape of 60 saw logs was measured every third centimeter. The erro r attributable to bark when using optical scanners was simulated separ ately. The results From the simulations showed that when measuring the outer shape on bark, the X-ray LogScanner facilitated measurement of the minimum shadow diameter with the same accuracy as with a 3-D optic al scanner. The results also showed that the potential of combining th e X-ray LogScanner with a 3-D optical scanner should be investigated.