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Stereoscopic vision three-dimensional displacement measurement method based on structure surface point features

A technology of stereo vision and structured surface, applied in measurement devices, image data processing, instruments, etc., can solve problems such as poor practicability and limitations of artificial targets

Active Publication Date: 2021-01-22
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0006] In order to solve the problems of limitations and poor practicability of artificial targets in civil engineering tests, the present invention provides a stereoscopic three-dimensional displacement measurement method based on structure surface point features. The present invention provides the following technical solutions:

Method used

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  • Stereoscopic vision three-dimensional displacement measurement method based on structure surface point features
  • Stereoscopic vision three-dimensional displacement measurement method based on structure surface point features
  • Stereoscopic vision three-dimensional displacement measurement method based on structure surface point features

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specific Embodiment 1

[0078] according to Figure 1 to Figure 9 As shown, the present invention provides a stereoscopic three-dimensional displacement measurement method based on structure surface point features, specifically:

[0079] A stereo vision three-dimensional displacement measurement method based on structure surface point features, comprising the following steps:

[0080] Step 1: Use a stereo vision system to collect images of the structural surface in the deformation process to obtain a left and right image sequence, and preprocess the image sequence to obtain a reference image; the stereo vision system, such as figure 1 shown.

[0081] The step 1 is specifically:

[0082] Step 1.1: Preprocessing the image sequence, selecting the region of interest on the left image at the initial moment, taking the object of interest on the structural surface as the measurement target, and selecting a rectangular region containing the measurement target on the left image at the initial moment as the ...

specific Embodiment 2

[0139] This embodiment is a three-dimensional displacement measurement test of a three-story frame model seismic shaking table, which is specifically prepared according to the following steps:

[0140] The three-layer frame model used in this embodiment is as follows Figure 6 As shown, the length and width of the model structure are 410mm×150mm, and the height is 900mm. The vibrating table used in the test is a WS-Z30-50 small vibrating table produced by Beijing Pope Company. The size of the vibrating table is 480mm×520mm, and the height of the table is 300mm. The vibrating table is a one-way vibrating table, and the vibration direction is selected as the x direction . During the three-dimensional displacement measurement test, high-strength double-sided adhesive is used to paste the test image and the circular target at the measuring point on the surface of the model. The size of the test image is 100mm×100mm. The diameter of the circle is 35mm, black on the outside and wh...

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Abstract

The invention relates to a stereoscopic vision three-dimensional displacement measurement method based on structure surface point features. The invention relates to the technical field of structure measurement, and aims to solve the problems of limitation and poor practicability in arrangement of an artificial target on the surface of a structure in a visual measurement process. The method comprises the following specific steps: performing image acquisition on a structure surface in a deformation process by adopting a stereoscopic vision system to obtain left and right image sequences, and preprocessing the image sequences; extracting feature points in the region of interest of a reference image and the search subareas of the image sequences; carrying out left and right image stereo matching and left and right image sequence matching at the initial moment; obtaining three-dimensional coordinates of each feature point at each moment; and obtaining the displacement information of the measurement structure. The method can be applied to the field of structure three-dimensional displacement measurement.

Description

technical field [0001] The invention relates to the technical field of structure measurement, and relates to a stereoscopic three-dimensional displacement measurement method based on structure surface point features. Background technique [0002] In the field of civil engineering, visual measurement technology is a measurement technology based on computer vision and image processing. By simulating human vision to reconstruct the actual structure, the actual deformation information of the structure can be obtained. [0003] In 2007, Li et al. improved the OCM method and proposed a robustness-enhanced direction code matching method for pattern recognition, which also had better recognition results when the illumination changes were large and the image was blurred; in 2013, Fukuda et al. used sub-pixel The high-precision direction code matching method and digital image correlation method obtained the vertical displacement and dynamic characteristics of the long-span highway bri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/03G06T7/38G06T7/33G06T5/00G06T5/40
CPCG01B11/03G06T7/38G06T7/33G06T5/40G06T2207/10021G06T5/70
Inventor 单宝华白志霖魏子奇
Owner HARBIN INST OF TECH
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