Point cloud-based police rush sign plane position measurement method
A measurement method and plane position technology, which is applied in image data processing, instruments, calculations, etc., can solve the problems of greater influence on positioning accuracy, and achieve the effects of good versatility, high precision, and avoiding influence
Pending Publication Date: 2021-01-12
CHINA RAILWAY SHANGHAI DESIGN INST GRP
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The positioning accuracy of this method is greatly affected by the matching accuracy
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[0020] Example: such as figure 1 As shown, the point cloud-based method for measuring the plane position of the warning mark in the present embodiment includes the following steps:
[0021] S1: Filter according to the obtained point cloud data of the railway area, and use a suitable point cloud filtering algorithm to obtain the ground point cloud and non-point point cloud of the railway area. The point cloud data of the railway area refers to the point cloud data of the railway area including the warning mark.
[0022] S2: Establish a plane grid according to the size of the railway area, such as figure 2 As shown, the plane grid of the railway area includes a grid 1 divided on the ground 3 , and the ground 3 includes the set warning signs 2 . The elevation mean value of the points in the grid is used as the elevation datum, and the calculation formula is as follows:
[0023]
[0024] In the formula, Height mean as height datum, h i is the sum of the elevations of the...
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The invention relates to a point cloud-based police rush sign plane position measurement method, which comprises the following steps of: S1, filtering according to acquired regional point cloud data to acquire a ground point and a non-ground point; S2, establishing a plane grid model according to the size of the measurement area, taking the mean value of the elevations of the ground points in theplane grid model as the elevation reference of the grid, establishing a buffer area with a certain distance vertically upwards along the elevation reference of the grid, and obtaining the point cloudin the buffer area; S3, adopting an RANSAC algorithm and a weight selection iteration method to extract the police rush mark point cloud and perform coordinate fitting after projection so as to obtainthe plane position coordinates of the police rush mark. The method has the advantages that the universality is good, and the method can be suitable for plane position extraction of police officers ofdifferent sizes and models; the method is high in precision, the processed point cloud data are fitted through the fitting method of the weight selection iterative least square method, the influenceof gross error points on the fitting result in the surface point cloud extraction process is effectively prevented, and the fitting precision is improved.
Description
technical field [0001] The invention relates to the technical field of three-dimensional laser railway measurement, in particular to a method for measuring the plane position of a warning mark based on point clouds. Background technique [0002] With the rapid development of my country's railway network, the railway line network is becoming more and more complex. Therefore, in the process of line reconstruction and new line design, it is necessary to measure some ground features and topography in existing stations. The warning sign is one of the signal signs to ensure the safety of driving on the line, so the determination of the position of the warning sign is important for the line reconstruction and the new line design. [0003] The traditional plane position measurement of the police mark is measured by the method of GPS-RTK. During the measurement process, the position of the centering pole is collected on the edge of the police mark. Therefore, the plane position colle...
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IPC IPC(8): G06T7/00G06T7/70
CPCG06T7/0002G06T7/70G06T2207/10028G06T2207/30252
Inventor 李世超王文庆陈军帅明明孙盼盼
Owner CHINA RAILWAY SHANGHAI DESIGN INST GRP