Fast compound filtering method for 3D point cloud based on line laser scanning
A three-dimensional point cloud and filtering processing technology, applied in the field of visual measurement, can solve the problem that a single filtering method cannot simultaneously remove isolated noise points outside the main point cloud, small-scale noise points, etc., and achieves wide application, high robustness, and extended applicability. range effect
Active Publication Date: 2020-04-28
DALIAN UNIV OF TECH
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[0004] In order to overcome the shortcomings of the prior art, the present invention invents a fast composite filter processing method based on line laser scanning three-dimensional point cloud, and improves the single filter method which cannot simultaneously remove isolated noise points outside the main point cloud and small-scale noise inside the main point cloud Point defects, through the point cloud composite filtering algorithm, the effective removal of large-scale noise to small-scale noise is realized one by one. This method effectively improves the adaptability, robustness and effectiveness of the filtering algorithm, and is a widely used filtering method. algorithm
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[0046] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and technical solutions.
[0047] The line laser scanner 3 selected in this embodiment is the scanner of the LJ-7060 model of Keyence Corporation, the standard ball 5 selected is a matte ceramic ball with a standard diameter of 15mm, and the PI electronic control platform 1 is M521.DD1 of PI Company Model electric control platform.
[0048] Step 1: Build a point cloud acquisition system to obtain scanned 3D point clouds
[0049] Install the line laser scanner to the PI electronic control platform 1 through the fixture 2, and connect the I / O output port of the PI electronic control platform 1 to the external trigger terminal of the line laser scanner 3, and place the standard ball 5 on the standard ball seat 4, and together with the supporting platform 6 placed within the scanning depth of field of the online laser scanner 3; The Y axis o...
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The invention's fast composite filtering processing method based on line laser scanning three-dimensional point cloud belongs to the field of visual measurement, and relates to a fast composite filtering processing method based on line laser scanning three-dimensional point cloud. This method uses voxel filtering algorithm, median filtering and moving window least squares filtering algorithm for composite filtering. First, the voxel filtering algorithm is used to remove invalid point clouds and isolated point clouds outside the main point cloud, and then median filtering is used to remove them. For high-frequency noise mixed in the main point cloud and at the edges, moving window least squares filtering is finally used to perform line-by-line fitting filtering on the scanning point cloud to filter out the small-scale noise mixed in the main point cloud, and finally the noise removal method is obtained The final effective 3D point cloud. This method effectively improves the shortcoming of a single filtering method that cannot remove multiple types of noise at the same time, effectively expands the applicable scope of filtering, and is a filtering method with broad application prospects.
Description
technical field [0001] The invention belongs to the field of visual measurement, and relates to a fast composite filter processing method based on line laser scanning three-dimensional point cloud. Background technique [0002] With the continuous development of science and technology, component measurement has gradually become an indispensable part of production. Various types of measurement problems, including contour, gap, shape and defect, have raised great challenges to the accuracy and rapidity of the measurement method. high demands. Among the existing measurement methods, the line laser measurement method is widely used in industrial production due to its fast, high-precision and non-contact measurement advantages. The line laser scanner is a key measuring instrument to accurately obtain the three-dimensional topography of the surface of the measured object. It is widely used in the field of measurement due to its high precision and good adaptability. The line lase...
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IPC IPC(8): G06T5/00G06T7/13
CPCG06T7/13G06T2207/20032G06T2207/10028G06T5/70
Inventor 刘巍逯永康赵海洋邸宏图张洋贾振元
Owner DALIAN UNIV OF TECH