Oberflächenklassifikation anhand von Farbstrukturen - Probleme und Lösungsmöglichkeiten in der holzverarbeitenden Industrie

Quality assurance in the wood products industry comprises tasks like the identification of different decors of the measurement of discolorations on decorated surfaces. These tasks do not require a complete surface scan but a high color sensitivity. Therefore camera sensors and image processing systems are often not suitable. As an alternative color sensors can be used which are integrated in a PC module. The sensor and light source is connected to a measuring head positioned closely above the moving surface on a conveyor belt using a fibre optic bundle, and thus a line scan can be obtained. WKI developed a system capable to solve identification tasks (e.g. for floor products) with a low-cost sensor and a fuzzy-based computation method. Preliminary investigations show that discolorations on decorated board products (e.g. caused by temperature deviations in the press) can be detected using a similar set-up but using UV light and a spectroscopic sensor with a high resolution in the wavelength spectrum. Due to very different tasks in the industry initial studies are recommended before an application is designed.