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Application of image mosaic technology in tunnel surrounding rock deformation noncontact measurement

A non-contact measurement and image stitching technology, applied in measurement devices, optical devices, instruments, etc., can solve problems such as limitations, achieve the effect of improving efficiency and safety, highlighting technological progress, and improving speed

Inactive Publication Date: 2012-08-01
63653 FORCES PLA
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a non-contact measurement method for surrounding rock deformation based on image mosaic technology, which overcomes the limitations of existing photogrammetry technology in the measurement of large-scale section surrounding rock deformation in tunnels

Method used

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  • Application of image mosaic technology in tunnel surrounding rock deformation noncontact measurement
  • Application of image mosaic technology in tunnel surrounding rock deformation noncontact measurement
  • Application of image mosaic technology in tunnel surrounding rock deformation noncontact measurement

Examples

Experimental program
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Embodiment

[0021] The application of the present invention includes the acquisition of the panoramic view of the monitoring section and the processing of the image information, and realizes the non-contact measurement of the deformation of the surrounding rock of the large section of the tunnel;

[0022] Such as figure 2 Shown:

[0023] 1. On the monitoring section 12 set in the surrounding rock section of the tunnel, the points to be measured 1-6 and the image stitching mark points 7, 8 are evenly distributed; the precise three-dimensional control field 9, 10 is placed in front of the monitoring section 12 as close as possible The position of the monitoring section; the digital camera 11 is fixedly placed in front of the monitoring section 12 and the precise three-dimensional control field 9, 10, so as to determine that the local points to be measured 1-3 of the monitoring section 12 and the image stitching mark points can be clearly observed 7, 8 and the local marking ball 13 of the ...

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Abstract

The invention relates to an application of the image mosaic technology in tunnel surrounding rock deformation noncontact measurement, in particular to an application in noncontact measurement of tunnel large-size section surrounding rock deformation. The measurement method includes firstly, arranging points to be measured and image mosaic mark points on a large-size monitoring section, placing portable precise three-dimensional controlling fields in front of the large-size monitoring section, performing convergent photography by an ordinary digital camera to capture monitored section overlapping sub-image groups of the points to be measured, the image mosaic mark points and the controlling fields included during different periods, then carrying out distortion correction and high-precision mosaic to the images to acquire a panorama of the monitoring section; secondly, extracting image point coordinates of the points to be measured and the controlling points in the panorama by using the sub-pixel location technology, analyzing the spatial three-dimensional coordinates of the points to be measured by a direct linear transformation method, calculating the measuring line lengths among the points to be measured during the same period and the changes of the measuring line lengths among the points to be measured during different periods so as to acquire the displacement information. Accordingly, the accurate results of the tunnel large-size section surrounding rock deformation noncontact measurement can be realized.

Description

technical field [0001] The invention relates to a non-contact measurement technology for tunnel surrounding rock deformation based on close-range digital images, and is especially suitable for non-contact measurement of large-scale tunnel surrounding rock deformation. Background technique [0002] The currently known non-contact measurement of tunnel surrounding rock deformation based on close-range digital images refers to the use of the basic principle of close-range photogrammetry to realize the spatial measurement points in a unified coordinate system by establishing the corresponding mathematical relationship between the image and the corresponding point coordinates on the surface of the photographed object. Under the coordinate measurement, the length of the measuring line between the two measuring points observed in the same period can be obtained, and the displacement information of the surrounding rock can be obtained according to the change of the length of the mea...

Claims

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Application Information

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IPC IPC(8): G01B11/16
Inventor 吴祖堂朱宝良杨德猛贾明雁邹虹黄晓飞鲁辉
Owner 63653 FORCES PLA
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