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Similar model displacement field measuring system and method based on grid dot matrix

A technology similar to models and measurement systems, applied in measurement devices, instruments, optical devices, etc., can solve problems such as changes, grid point damage, model surface cracks, etc., to achieve reliable extraction, improved accuracy, and good stability.

Active Publication Date: 2013-09-25
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

[0005] The present invention aims to solve the problem that the automatic grid method needs manual intervention when the illumination changes, cracks appear on the model surface, and the grid points are damaged, etc., and provides a displacement field measurement system and method based on image recognition and computer vision technology. The system and method can still realize fully automatic measurement of the displacement field when the above situation occurs

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  • Similar model displacement field measuring system and method based on grid dot matrix
  • Similar model displacement field measuring system and method based on grid dot matrix
  • Similar model displacement field measuring system and method based on grid dot matrix

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Embodiment Construction

[0017] Some specific examples are given below regarding the technical solution adopted by the present invention. It should be noted that the described examples are only intended to facilitate the understanding of the present invention, and do not limit it in any way.

[0018] Such as figure 1 Shown are the schematic diagrams of two embodiments of the grid points of the similar model displacement field measurement system of the present invention. figure 1 The shape of the grid points shown in a is a rectangle, figure 1 The shape of the grid point shown in b is circular, and there is an identity code "A21" on the grid point to identify its identity. The grid point can be made by printing the identity code on a piece of paper through a printer, and then fixing it on the grid by pasting. similar model surfaces. Grid point shapes except figure 1 a and figure 1 In addition to the rectangle and circle shown in b, any shape that can be automatically recognized by the computer can ...

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Abstract

The invention relates to a similar model displacement field measuring system which comprises a grid dot matrix, an image collection device and a computer, wherein the grid dot matrix is arranged on the surface of a similar model, the image collection device is composed of a video camera array or a single video camera with accurate and controllable poses, the computer is used for processing data, and identity codes composed of symbols such as numbers and letters are marked on grid dots. On the basis of the measuring system, the invention further relates to a measuring method. The measuring method comprises the steps of obtaining images of the surface of the similar model in a regionally-collecting mode; extracting the grid dots with the geometrical shapes of the grid dots as characteristics; using the geometrical center of each grid dot as a coordinate of each grid dot; utilizing a pose relation relative to a video camera coordinate system of a measuring coordinate system for converting the coordinates of the grid dots into a uniform coordinate system; recognizing the identity codes inside the areas of the grid dots, and conducting matching on the grid dots on the basis of the identity codes; obtaining a displacement field of the similar model by comparing changes of the coordinates of the grid dots in the measuring coordinate system.

Description

technical field [0001] The invention relates to the field of similar model displacement field measurement and photogrammetry, in particular to a non-contact fully automatic measurement system and method for measuring the displacement field of a similar model surface by using image processing technology. Background technique [0002] Similarity model test is one of the main technical means to study mine pressure and rock formation law. Compared with theoretical analysis and numerical simulation methods, similar model tests can qualitatively or quantitatively reflect the mechanical characteristics of rock formations, and can more comprehensively simulate underground engineering structures, geological structures, and rock formation combinations. Therefore, the similar model test can explore many problems that are not easy to solve by mathematical and mechanical methods at present, and has been widely used in the fields of mineral resource mining, water conservancy and hydropowe...

Claims

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Application Information

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IPC IPC(8): G01B11/02
Inventor 杨克虎杨胜利袁志宝
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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