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Method and equipment for measuring damage of shear wall based on digital image and medium

A technology of digital image and measurement method, which is applied in the direction of optical testing flaws/defects, etc., to achieve the effect of suppressing the influence of light

Inactive Publication Date: 2021-08-24
FUJIAN JIANGXIA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems existing in the above-mentioned prior art, the present invention proposes a method for measuring shear wall damage based on digital images, and solves the problem of measurement accuracy caused by illumination images

Method used

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  • Method and equipment for measuring damage of shear wall based on digital image and medium
  • Method and equipment for measuring damage of shear wall based on digital image and medium
  • Method and equipment for measuring damage of shear wall based on digital image and medium

Examples

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Embodiment 1

[0091] see figure 1 , a method for measuring shear wall damage based on digital images, comprising the following steps:

[0092] Photometric calibration, setting the camera for collecting shear wall images, and calibrating the response and vignetting of the camera based on the response function and vignetting function of the camera;

[0093] Establish a target point pixel tracking model based on illumination robustness, and determine the correlation function of any point in the camera coordinate system from the reference image of the previous frame to the current image position change of the next frame:

[0094]

[0095]

[0096] see figure 2 , in the above formula, u and v are the horizontal and vertical displacements of the midpoint of the reference image in the current image respectively, (x refc ,y refc ) and (x refi ,y refj ) represent the coordinates of the center point A and any point B of the reference image, respectively. and Respectively represent the...

Embodiment 2

[0172] The equipment for measuring shear wall damage based on digital images includes a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein the processor implements the program as described in the present invention. The method described in any embodiment.

Embodiment 3

[0174] The medium for measuring shear wall damage based on digital images has a computer program stored thereon, and is characterized in that, when the program is executed by a processor, the method according to any embodiment of the present invention is realized.

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Abstract

The invention relates to a method for measuring the damage of a shear wall based on a digital image, and the method comprises the following steps: setting a camera for collecting the image of the shear wall, and calibrating the response and vignetting of the camera based on the response function and vignetting function of the camera; obtaining a DIC digital image correlation model used for calculating a correlation function of position change of any point from a reference image of a previous frame to a current image of a next frame and pixel change of a target point based on illumination influence; collecting a video of the shear wall through a camera for photometric calibration, obtaining a front frame image and a rear frame image from the video, setting the size of an image capture window, capturing pixel change and position change of a global target point of the shear wall through a DIC digital image correlation model and a correlation function of target point pixel change based on illumination influence, and calculating the strain change of the global target point according to the pixel change and the position change of the global target point; and generating a real-time damage identifier of the shear wall according to the strain change of the global target point.

Description

technical field [0001] The invention relates to a method, equipment and medium for measuring damage to a shear wall based on a digital image, and belongs to the technical field of damage detection and image processing of a prefabricated concrete shear wall. Background technique [0002] Digital image correlation technology is a method based on image processing and numerical calculation of non-interference optical measurement to obtain deformation information. The digital image correlation method collects video images and processes the deformation of the measured structure captured by the frames before and after the video images. The deformation of the measured structure is calculated from the video image, and then the strain field of the measured structure is further calculated. The video image before deformation is usually called the reference image, and the video image after deformation is called the current image. Digital image correlation technology is also called digita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88
CPCG01N21/88
Inventor 蒋国平肖三霞郭金龙
Owner FUJIAN JIANGXIA UNIV
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