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Calibration Method of Reflectivity in 3D Laser Scanning in Tunnel

A technology of three-dimensional laser and correction method, which is applied in the direction of re-radiation, measurement of scattering characteristics, re-radiation of electromagnetic waves, etc., can solve problems such as difficult to collect images of inner walls of tunnels, and achieve automatic extraction and interpretation, reduce differences, The effect of increasing the contrast

Active Publication Date: 2017-01-25
SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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Problems solved by technology

Traditional image acquisition generally uses artificial optical photography. This acquisition method is limited by the light conditions and working time in the tunnel, and it is difficult to acquire a large number of high-precision and measurable images of the inner wall of the tunnel.

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  • Calibration Method of Reflectivity in 3D Laser Scanning in Tunnel
  • Calibration Method of Reflectivity in 3D Laser Scanning in Tunnel
  • Calibration Method of Reflectivity in 3D Laser Scanning in Tunnel

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Embodiment

[0019] Embodiment: This embodiment specifically relates to a method for correcting reflectivity of three-dimensional laser scanning in a tunnel. The purpose of reflectivity correction is to: 1) solve the problem of uneven color (gray scale) that occurs when reflectivity information generates images; 2 ) Improve the detailed information of the image, including contrast, brightness, etc., which will help improve the interpretation ability of the image; 3) Unify the reflectivity characteristics (homogenization), which is convenient for the subsequent implementation of automatic extraction of water leakage information and tunnel diseases.

[0020] like Figure 1-4 As shown, the method for correcting the reflectivity of the three-dimensional laser scanning in the tunnel in this embodiment specifically includes the following steps:

[0021] (1) In the section of the tunnel to be scanned, select a typical section with less attachments on the inner wall to collect scanning data from a...

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Abstract

The invention discloses an in-tunnel three-dimensional laser scanning reflectivity correction method. The method at least includes the steps: in a to-be-scanned tunnel interval, acquiring scanning point cloud data of at least three survey stations by a three-dimensional laser scanner, and generating an orthoimage according to a cylindrical projection method; dividing the generated orthoimage, making statistics on a reflectivity distribution curve of survey lines of each division and collecting the reflectivity distribution curves so as to obtain a reflectivity correction curve; scanning the orthoimage, and correcting the orthoimage according to the reflectivity correction curve. The in-tunnel three-dimensional laser scanning reflectivity correction method has the advantages that the difference between real inner wall reflectivity of one tunnel can be decreased after the laser measurement reflectivity of the tunnel is corrected, and the three-dimensional laser scanning orthoimage effect is enhanced; meanwhile, the method can be used for unifying reflectivity value and increasing image contrast, so that automated extraction and interpretation of tunnel deterioration information are benefited.

Description

technical field [0001] The invention relates to a correction method for three-dimensional laser scanning reflectivity, in particular to a correction method for three-dimensional scanning reflectivity in a tunnel. Background technique [0002] In the maintenance work of urban rail transit tunnels, the spatial distribution and apparent disease information of auxiliary equipment can be identified and measured by interpreting the image information of the inner wall of the tunnel. Traditional image acquisition generally uses artificial optical photography. This acquisition method is limited by the light conditions and working time in the tunnel, and it is difficult to acquire a large number of high-precision and measurable images of the inner wall of the tunnel. [0003] 3D laser scanning technology is a measurement technology that quickly obtains the 3D coordinates and laser reflectivity of the measured object by means of laser ranging. The collected high-density point cloud dat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88G01N21/47G01S17/46
Inventor 褚平进许正文付和宽刘飞袁钊程胜一
Owner SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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