A Method for Determining Object Displacement and Direction 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 cumbersome operation, unfavorable promotion and application, high operator requirements, etc., and achieve the effect of reducing operation difficulty and easy promotion and application.
Active Publication Date: 2021-02-05
HUAZHONG UNIV OF SCI & TECH
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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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[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 can 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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The invention discloses a method for determining the displacement and direction of an object based on digital image diffraction, which belongs to the field of engineering measurement. This method takes two images with common parts before and after deformation of the same object at the same position, and each selects an analysis area with the same shape and the same number of pixels, and performs fast Fourier transformation, multiplication of variables, addition, and conjugate phase. Multiply and change the variable value to get four trigonometric functions about the pre-deformed image and displacement, process to get sine trigonometric function and cosine trigonometric function, discrete Fourier transform, add the result of cosine trigonometric function transformation to the product of sine trigonometric function transformation result and imaginary number j Wait for the image processing process to obtain an impulse function with only one peak point. According to the position coordinates of the point corresponding to the highest impulse value of the impulse function, the direction and displacement of the image deformation can be directly determined. The operation of the present invention is simple, fast 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...
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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