Registrering av Arsringsutveckling med Bildanalys (Recording Annual RingDevelopment Using Image Analysis)

摘要

The purpose of this study is to investigate the potential of using image analysisto count the number of annual rings in the end of a log. The study is based on a practical test using 27 pine and 27 spruce disks. Disks have been cut from fresh logs and from logs that have been stored in a stack. This report shows some of the problems involved when using image analysis in a sawmill, and includes a practical test for an image analysis system. Several variables that influence the ability to count annual rings have been tested. Examples of such variables include the method of cutting the disks from the logs, the freshness of the disks, and whether the disks have been discolored by weather or wind. Two methods to detect the pith location were devised. The second method, which seems to work best, uses the orientation of the annual rings to estimate the pith location.