TAILIEUCHUNG - Báo cáo lâm nghiệp: "Automatic determination of fiber orientation on OSB surface using line detection method based on small eigenvalue analysis"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Automatic determination of fiber orientation on OSB surface using line detection method based on small eigenvalue analysis" | Ann. For. Sci. 62 2005 385-390 INRA EDP Sciences 2005 DOI forest 2005034 385 Original article Automatic determination of fiber orientation on OSB surface using line detection method based on small eigenvalue analysis Chuanshuang HUa Chiaki TANAKAb Reynolds OKAIc Tadashi OHTANId a College of Forest South China Agricultural University Wushan Tianhe District Guangzhou Guangdong . of China b Department of Environmental Science and Technology Kagoshima University Kagoshima Japan c Department of Technology Education University of Education Winneba Kumasi Campus PO Box 1277 Kumasi Ghana d Faculty of Science and Engineering Shimane University Matsue Shimane Japan Received 22 March 2004 accepted 22 February 2005 Abstract - The modulus of rupture MOR which is the key to the strength of oriented strand board OSB depends on the fiber orientation on OSB surface. In order to improve the quality of OSB products it is essential to optimize the flake alignments of the wood strands. In this paper a line detection method based on small eigenvalue in conjunction with Canny edge detector was adopted to simulate the fiber strands with the ultimate aim of optimizing the fiber orientation and quality of the manufactured product. Then ellipse fitting analysis and or line fitting analysis were used to determine the fiber orientation for all line or ellipse connectedness labeling which expresses the fiber strands. The fiber orientation measured automatically was compared to that measured manually. It was observed that the ratio of the fiber orientation measured manually to that measured automatically was close to unity. The results indicated that the method developed in this paper when used to determine fiber orientation of the face surface in OSB was effective. However the method developed in this paper was not effective for the under surface because small strands tend to fall when the face and middle layer were distributed on the edge formation of fiber strands. orientated .

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