A method for determining displacement amount and direction of an object based on digital image diffraction

An object displacement, digital image technology, applied in image analysis, image data processing, instruments, etc., can solve the problems of unfavorable popularization and application, cumbersome operation, high operator requirements, etc., to achieve the effect of easy popularization and application and reduce the difficulty of operation

Active Publication Date: 2019-01-18
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, this method is cumbersome to operate and has high requirements for operators, which is not conducive to popularization and application.

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  • A method for determining displacement amount and direction of an object based on digital image diffraction
  • A method for determining displacement amount and direction of an object based on digital image diffraction
  • A method for determining displacement amount and direction of an object based on digital image diffraction

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[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.

[0042] As shown in Figures 1 to 3, the specific implementation process of the preferred embodiment of the present invention is as follows:

[0043]1) First, use MATLAB software to program to obtain two simulated speckle images before and after deformation, as shown in Figure 1. Figure 1A is the speckle image before deformation, Figure 1B is the deformed speckle image, and the two images inclu...

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Abstract

The invention discloses a method for determining displacement amount and direction of an object based on digital image diffraction, belonging to the engineering measurement field. By taking two imagesof the same object before and after deformation at the same position, and analyzing areas which have the same shape and the same number of pixels, Fast Fourier transform, variables multiplication, addition, conjugate multiplication, the variable value changing are performed to obtain four trigonometric functions about the pre-distortion image and the displacement trigonometric function, the sinetrigonometric function and the cosine trigonometric function are obtained, Discrete Fourier transform (DFT) is carried out, the result of cosine trigonometric function transform is added to the product of sine trigonometric function transform result and imaginary number j to obtain the pulse function with only one peak value. According to the position coordinates of the point corresponding to thehighest pulse value of the pulse function, the direction of image deformation and displacement can be determined directly. The invention is simple in operation, quick and intuitive.

Description

technical field [0001] The invention belongs to the field of engineering measurement, and relates to a method for determining the deformation direction of an object in the field of engineering measurement, and more specifically, relates to a method for determining the displacement direction of an object based on digital image diffraction. Background technique [0002] Deformation measurement or monitoring of large engineering structures, such as bridges, transmission towers and tunnels, is a major technical issue at present. These large-scale engineering structures have large dimensions and harsh environments, and it is difficult and dangerous for personnel to carry measuring instruments for measurement. The appearance of the image vision system proposes a feasible way to solve this measurement problem. The method of measuring the deformation of large structures with digital images has the characteristics of long-distance, non-destructive, full-field, high degree of automat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/73G06T7/42
CPCG06T7/42G06T7/74
Inventor 何玉明杨凯杨唯笠韩世豪雷烨
Owner HUAZHONG UNIV OF SCI & TECH
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