Title :
Detection of knots in veneer surface by using laser scattering based on the tracheid effect
Author :
Tormanen, Veli-Matti O ; Makynen, Anssi J.
Author_Institution :
Meas. & sensory Lab., Univ. of Oulu, Kajaani, Finland
Abstract :
This work introduces a method for measuring the location and size of knots in veneer surface by using laser point scanning. Scattering patterns formed by laser spots are analyzed and image processing methods are employed in order to measure the amount and direction of scattering at each measurement point. Three different algorithms are used to detect knots based on these data.
Keywords :
coatings; image processing; measurement by laser beam; wood processing; image processing methods; knots detection; laser point scanning; laser scattering; tracheid effect; veneer sheets; veneer surface; wood production industry; Acoustic scattering; Cameras; Laboratories; Laser beam cutting; Light scattering; Machine vision; Optical scattering; Optical surface waves; Size measurement; Surface emitting lasers; Tracheid; grain direction; knot detection; laser scattering; veneer;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2009. I2MTC '09. IEEE
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-3352-0
DOI :
10.1109/IMTC.2009.5168681
