A method and a device for locating wood cutting points based on log curvature

Abstract

The invention discloses a wood cutting point positioning method and device based on log curvature. The method comprises: extracting log three-dimensional point cloud from a plurality of frames of logthree-dimensional images, fusing and filtering the extracted log three-dimensional point cloud to obtain a first log three-dimensional point cloud; 3-D point cloud of that first log are sliced transversely one by one to obtain a plurality of slice arcs; circle fitting is performed on a plurality of slice arcs to obtain the center points of all the circles obtained by fitting; after projecting allthe center points to the direction of parallel log conveyor belt and the direction of log conveyor belt, the curve fitting is carried out for the discrete points in the projection direction, and the bending point and the bending degree of the log are determined according to the curvature of the fitting curve. The apparatus includes a processor for executing the positioning method described above.The invention can realize the automatic positioning and selection of the cutting point of the bent wood, improve the utilization rate of the log, reduce the processing operation and has high automation level, and can be widely applied in the wood processing field.

Description

Technical field [0001] The invention relates to the technical field of wood processing, and in particular to a method and device for locating wood split points based on log curvature. Background technique [0002] Logs are naturally-grown woods, and their shape is not necessarily a straight cylinder, and has defects such as twisting, straight camber, tile camber, and / or trunk-shaped concave pockets and big pockets. And this kind of defect will damage the material of the log, so it will reduce the yield of the finished lumber, and the fiber is easy to be cut during processing, which will reduce the strength of the wood, especially the resistance to bending, along the grain and along the grain. The impact of compressive strength is most obvious. [0003] For the log curvature, the empirical formula is f=(H / C)×100%, where H is the maximum bending height of the log, C is the horizontal length of the log inner surface; and the approximate formula is h≈C 2 / 8r, where h is the log bendin...

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Problems solved by technology

And this kind of defect will damage the material of the log, so it will reduce the yield of the finished material, and the fiber will be easily cut off during processing, which will reduce the strength of the wood, especially the resistance to bending, tensile resistance along the grain and resistance to the grain. The impact of compressive strength is most pronounced

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