A method for positioning and segmenting parts to be measured in 3D point cloud measurement, and a scanner

Abstract

The invention belongs to the technical field of 3D point cloud measurement, and discloses a positioning and segmentation method of a part to be measured in 3D point cloud measurement, and a scanner; firstly, a 3D scanner is used to scan the whole workpiece to be measured, and then manually select the part to be measured , measure the parameters of the part; use it as the overall template, and select each part to be measured as the template of the part to be measured; match the workpiece to be measured with the overall template for overall positioning; finally divide the part to be measured through the template of the part to be measured . The whole process of the invention takes less than one minute, which greatly reduces the measurement time, and after the template to be tested is selected, no manual operation is required, which has great significance for the batch automatic detection of workpieces. The invention uses registration technology for positioning, so that the workpiece does not need to be accurately fixed, and the use is more flexible; the method of adjacent segmentation is used to make the point cloud to be measured not limited to the plane model, and it is not affected by the complexity of the workpiece, making the use scene wider .

Description

technical field [0001] The invention belongs to the technical field of 3D point cloud measurement, and in particular relates to a positioning and segmentation method and a scanner for a part to be measured in 3D point cloud measurement. Background technique [0002] At present, the existing technology commonly used in the industry is as follows: in 3D point cloud measurement, the workpiece is first scanned with a 3D scanner to obtain the point cloud of the workpiece, and then the point cloud is measured. Unlike the three-coordinate instrument, which only takes the points to be measured, the 3D scanner takes out the points of the entire workpiece, and cannot directly measure a single plane or ring. To solve this problem, the prior art uses fixtures to precisely fix the workpiece when detecting the plane of the workpiece to ensure that the workpiece is at the same position each time, and then limit the field of view of the 3D scanner to the plane of the workpiece or use a thro...

AI Technical Summary

Problems solved by technology

[0004] (1) The existing technology limits the field of view of the 3D scanner to the plane or uses the point cloud in the through-segmented cuboid when detecting the plane. For complex workpieces, it is difficult to obtain or segment the simple plane; only the plane can be photographed, which cannot be effective Take good pictures of circles and other geometric shapes

[0005] (2) The existing technology adopts manual selection of the points to be measured on the captured point cloud, which loses the meaning of automatic measurement, and takes a lot of time. At the same time, manual selection of points is subjective and random, which increases the measurement error

At present, in order to achieve high-speed automatic segmentation, only simple shapes can be segmented.

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