ASSESSMENT OF WOOD SURFACE DEFECTS BASED ON 3D IMAGE ANALYSIS

摘要

This article presents the subject of analysis and the using of 3D images in a task of automatic detection and location of defects on wood surfaces. It discusses defects which occur on wood surfaces and presents examples of the most common defects recorded on production lines in the timber industry. The following section of this paper presents a method of building a 3D image of the surface using the laser triangulation method (LTM). The algorithm used to analyse the 3D image, which provides initial processing of the image in the scope of filtering and enhancing the characteristic properties of the image is discussed. Both height profile analysis and image analysis are employed in order to isolate the characteristic parameters of the defect. For selected defects, measurement algorithms which enable a parametric description of the defect and its location on the surface are presented.