Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method of Extracting 3D Axis of Tunnel Based on Minimum Bounding Box Algorithm

A three-dimensional axis and bounding box technology, which is applied in calculation, 3D image processing, image data processing, etc., can solve the problems of extracting the influence of tunnel diameter and not considering the twist of the three-dimensional axis of the tunnel, and achieves high speed, high precision, and improved automation. degree of effect

Active Publication Date: 2017-07-21
SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above algorithm does not take into account the twisting of the three-dimensional axis of the tunnel caused by tunnel bottom shear (settlement) or splicing, so it has a certain impact on the extraction of the tunnel diameter

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of Extracting 3D Axis of Tunnel Based on Minimum Bounding Box Algorithm
  • Method of Extracting 3D Axis of Tunnel Based on Minimum Bounding Box Algorithm
  • Method of Extracting 3D Axis of Tunnel Based on Minimum Bounding Box Algorithm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] Example: such as figure 1 As shown, this embodiment specifically relates to a method for extracting the three-dimensional axis of a tunnel based on the minimum bounding box algorithm. The method uses the three-dimensional laser scanning tunnel point cloud data to extract the lining ring through a tunnel minimum bounding box algorithm with variable angle steps. Point cloud slices, and then fit the extracted point cloud slices according to the circle (or ellipse) model to solve the central coordinates, and then smooth the tunnel axis through the second-order continuity of the horizontal curve and the second-order continuity of the vertical curve, and finally obtain high precision The three-dimensional axis of the tunnel. It can avoid the arbitrariness of human factors in the traditional operation method, and help to unify the detection method and accuracy of the three-dimensional axis of the tunnel.

[0025] Such as image 3 As shown, in the X-Y-Z coordinate system in t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method of extracting a three-dimensional axis of a tunnel based on a minimum bounding box algorithm. The method comprises the following steps of: extracting point cloud slices of a lining ring by virtue of the minimum bounding box algorithm of the tunnel with variable-angle step length; then, fitting the extracted point cloud slices according to an oval or circular model to solve coordinates of a center, and performing smoothing processing on the tunnel axis by adopting a horizontal-curve second-order continuous and a longitudinal-curve second-order continuous method; and finally, obtaining high-precision three-dimensional central axis of the tunnel. The method disclosed by the invention has the advantages that the three-dimensional axis of a single targe structure is automatically extracted by utilizing three-dimensional laser scanning original-point cloud data based on the minimum bounding box algorithm; the method is high in precision, high in speed, and capable of being used in tunnel axis detection, diameter convergence extraction, production of orthoimages, and the like. Besides, the defect that the tunnel design axis or actually measured axis is needed to be pre-input in the conventional processing method can be avoided, so that the automation degree of the data processing is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering measurement, and in particular relates to a method for extracting a three-dimensional axis of a tunnel based on a minimum bounding box algorithm. Background technique [0002] The central axis of the tunnel is a virtual curve at the center of the inner space of the tunnel parallel to its extension direction, which reflects the spatial posture and trend of the tunnel, and is the premise of extracting the longitudinal section of the tunnel. [0003] When using the total station to measure the three-dimensional axis of the shield tunnel, the traditional method generally uses the total station to measure multiple feature points of the lining ring section at a certain interval, and uses the circle fitting model to solve the central coordinate of the ring as the tunnel axis. In actual operation, it is necessary to manually carry out aiming and observation of measuring points on site, and the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/00
CPCG06T19/20
Inventor 褚平进程胜一王令文周理含谢海燕王吉许正文
Owner SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com