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A wood cutting point positioning method and device based on log curvature

A positioning method and bending technology, applied in the field of wood processing, can solve the problems of reducing the yield of finished wood, easy cutting of fibers, and reducing the strength of wood, so as to improve the level of automation and reduce the effect of optimal processing operations

Active Publication Date: 2021-04-23
SOUTH CHINA AGRI UNIV
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  • Application Information

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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

Method used

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  • A wood cutting point positioning method and device based on log curvature
  • A wood cutting point positioning method and device based on log curvature
  • A wood cutting point positioning method and device based on log curvature

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Embodiment Construction

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. For the step numbers in the following embodiments, it is only set for the convenience of illustration and description, and the order between the steps is not limited in any way. The execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art sexual adjustment. Moreover, the "front", "rear", "left", "right", "upper" and "lower" mentioned in the following embodiments are only used to clearly describe the relative positional relationship, not the absolute positional relationship. Adaptations are made according to the understanding of those skilled in the art. .

[0042] like figure 1 As shown, a wood cutting point positioning method based on log curvature, which includes the following steps.

[0043] Step S101, using the minimum bounding box to control the 3D shooting device...

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Abstract

The invention discloses a wood segmentation point positioning method and device based on log curvature. The method includes: after extracting log three-dimensional point clouds from several frames of log three-dimensional images, fusing the extracted log three-dimensional point clouds and Filtering to obtain the first three-dimensional point cloud of logs; horizontally slice the first three-dimensional point cloud of logs block by block to obtain several sliced ​​arcs; perform circle fitting on several sliced ​​arcs to obtain all fitted The center point of the circle; after projecting all the center points to the direction of the parallel log conveyor belt and the lateral direction of the log conveyor belt, curve fitting is performed on the discrete points in the projection direction, and the bending point of the log is determined according to the curvature of the fitting curve. its curvature. The device includes a processor for executing the above positioning method. The invention can realize the automatic positioning and selection of the cutting point of the curved wood, improve the log utilization rate and reduce the processing operation, has a high automation level, and can be widely used in the field of wood processing.

Description

technical field [0001] The invention relates to the technical field of wood processing, in particular to a wood cutting point positioning method and device based on log curvature. Background technique [0002] Logs are naturally growing lumber, not necessarily straight and cylindrical in shape, but having defects such as twists, cambers, tile cambers, and / or concave and large pockets in the shape of the trunk. 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 effect of compressive strength is most obvious. [0003] For log curvature, the empirical formula is f=(H / C)×100%, where H is the maximum bending height of the log, and C is the horizontal length of the inner surface of the log; and its approximate form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T7/60G06T7/70G06F17/11
CPCG06F17/11G06T7/0002G06T7/60G06T7/70
Inventor 张素敏尹令刘财兴田绪红夏玥
Owner SOUTH CHINA AGRI UNIV