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Automatic extraction method for multi-station three-dimensional laser point cloud target ball data

A three-dimensional laser, automatic extraction technology, applied in the direction of using optical devices, instruments, measuring devices, etc., can solve the problems of integration, unable to obtain fixed point positions through prisms, and different three-dimensional laser scanners, so as to reduce the overall error and improve the measurement. The effect of efficiency and data accuracy

Inactive Publication Date: 2020-02-07
中交三航局第三工程有限公司 +1
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Problems solved by technology

[0002] The 3D laser scanner is different from the general total station, it cannot obtain the fixed point position through the prism
This method needs to find a relatively smaller target ball in a large scene, and it is all determined by the human eye. Integration into other algorithms has become an obstacle in the automation process

Method used

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  • Automatic extraction method for multi-station three-dimensional laser point cloud target ball data

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Embodiment Construction

[0014] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0015] A multi-station three-dimensional laser point cloud target ball data automatic extraction method according to the present invention comprises the following steps:

[0016] 1. Read the point cloud data file, and set the intensity threshold, precision threshold, PCA threshold, known radius and other information according to the known information.

[0017] 2. Use the intensity threshold to mine high-intensity point cloud blocks and thin them according to density to reduce the amount of computing data. Then use the intensity threshold to filter out the edge points with weak intensity information and separate different point cloud blocks.

[0018] 3. Use the region...

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Abstract

The invention discloses an automatic extraction method for multi-station three-dimensional laser point cloud target ball data. According to the method, automatic extraction of multi-station three-dimensional laser point cloud target ball data is realized by adopting algorithms such as intensity threshold filtering, region growing method segmentation, PCA and least square iteration elimination andoverall least square fitting calculation. According to the method, the previous method of manually selecting target ball point cloud data and then performing sphere center fitting calculation is changed, and automatic extraction of multiple targets and fitting calculation of the sphere center can be efficiently realized.

Description

technical field [0001] The invention belongs to the technical field of automatic extraction of three-dimensional laser point cloud target ball data, and in particular relates to a method for automatically extracting multi-station three-dimensional laser point cloud target ball data. Background technique [0002] The 3D laser scanner is different from the general total station, which cannot obtain the fixed point position through the prism. Considering the viewing angle deformation factor, the target ball is usually used in actual engineering to realize the measurement of the coordinates of a certain point by the 3D laser scanner, because no matter from which angle the point cloud data of the target ball is collected, the fitted center of the ball is theoretically still same point. In the field of 3D modeling, the target ball is usually used to realize the registration of multi-station data and the transformation of the geographic reference coordinate system. In the field o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01B11/24
CPCG01B11/16G01B11/24
Inventor 卞桂荣李宝枝郭际明夏显文卢主兴
Owner 中交三航局第三工程有限公司
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