2D laser hole site detection method based on template matching
A technology of template matching and detection method, which is applied in the field of precision measurement, can solve problems such as the difficulty of hole position identification and positioning, and achieve the effects of improving the accuracy of normal measurement, improving the accuracy of position measurement, and improving the recognition rate
Pending Publication Date: 2020-08-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0004] The purpose of the present invention is to provide a 2D laser hole position detection method based on template matching, which can solve the problem of difficult hole position identification and positioning on non-ideal scanning surfaces such as highly reflective metals and strong light-absorbing composite materials, and improves the robustness of hole position detection. sex
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[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. Hereinafter, embodiments of the present invention will be described in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention. Those skilled in the art will understand that the singular forms "a", "an", "said" and "the" used herein may also include plural forms unless otherwise stated. It should be further understood that the word "comprising" used in the description of the present invention refers...
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The invention discloses a 2D laser hole site detection method based on template matching, belongs to the technical field of precision measurement, and can solve the problem of difficult hole site identification and positioning of non-ideal scanning surfaces such as high-reflection metal and strong-light-absorption composite materials. The method comprises: combining a 2D laser profilometer with aservo motor, and measuring three-dimensional point cloud of the surface of a workpiece hole area; removing hole edge outliers by using an improved median filtering algorithm, and carrying out binarization processing on point cloud z coordinate values; adaptively constructing a template of a to-be-measured hole according to the density of the point cloud, executing template matching, performing hole feature discrimination by using the ROI, finally detecting the position of the hole, and fitting a plane by using the neighborhood point cloud of the hole to calculate the normal of the hole. The method can effectively detect the holes in the non-ideal scanning surface, is high in robustness, and meets the requirements of measurement precision.
Description
technical field [0001] The invention belongs to the technical field of precision measurement, and in particular relates to a 2D laser hole position detection method based on template matching. Background technique [0002] In the process of product digital design and manufacturing, the numerical control system performs processing according to the theoretical mathematical model of the product, but due to errors in manufacturing and tooling positioning, the consistency between the processed workpiece and its theoretical digital model is often not guaranteed. Only relying on the theoretical digital model to locate the processing hole position, the accuracy will not meet the assembly requirements. In the actual processing process, the position of the processing hole position needs to be corrected according to the actual installation position of the workpiece. For example, in the automatic assembly of aircraft parts, there are usually several groups of reference holes on the surf...
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Login to View More IPC IPC(8): G06K9/62G06K9/32G01B11/00G01B11/24
CPCG01B11/00G01B11/24G06V10/25G06V10/751
Inventor 田威庄志炜石瀚斌廖文和张霖李波胡俊山
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS