Multi-line laser scanning tunnel three-dimensional reconstruction method

Abstract

The invention relates to a multi-line laser scanning tunnel three-dimensional reconstruction method, which comprises the following steps of: scanning and measuring a tunnel, acquiring data and recording advancing speed and distance; extracting point cloud three-dimensional data of the same position, analyzing and processing the point cloud three-dimensional data, and performing statistical outlier elimination; analyzing the data subjected to outlier elimination, calculating the gravity center of the data, representing the actual three-dimensional point of the current position by using the gravity center of the data, performing adaptive stretching and extension according to the actual moving position to obtain a tunnel three-dimensional preliminary model, and performing filtering by using bilateral filtering; and de-noising the data while keeping the edge data not affected by the farther data. According to the method, the characteristic that the multi-line radar is large in data size is fully utilized, fusion filtering is carried out on the data, and measurement data with higher precision can be obtained; the mobile multi-line radar scans the three-dimensional data, so that the whole tunnel can be scanned quickly while the precision is ensured, and the method has high practical value.

Description

technical field [0001] The invention belongs to the technical field of urban rail transit engineering design, and in particular relates to a multi-line laser scanning tunnel three-dimensional reconstruction method. Background technique [0002] Nowadays, urban rail transit is developing day by day. Subway tunnels are an important part of rail transit. There are many difficulties and problems in the implementation of each link in the planning and design of the subway, line measurement, project implementation, etc., and it is also a test for engineering and technical personnel. In terms of traditional measurement methods and monitoring, not only is it difficult and time-consuming, but also many unexpected situations will occur during the construction process, which will affect the normal construction and construction of the subway. Due to the changeable laying methods of subway construction lines, complex hydrological conditions at construction sites, inaccurate surveys of und...

AI Technical Summary

Problems solved by technology

Mobile scanning refers to placing the radar on a mobile platform and scanning the entire tunnel through the radar, so the scanning speed is fast, but because the radar is mobile, the radar scanning is similar to a spiral scanning, so some information will be lost, and the accuracy is not high.

Static scanning is to keep the radar stationary and then scan the surrounding information. This method has high scanning accuracy, but the equipment is stationary, so it takes a lot of time and is inefficient to scan all the tunnels.

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