A fast acquisition method of object deformation based on digital image diffraction

Abstract

The invention belongs to the technical field related to engineering measurement, and discloses a method for quickly acquiring the deformation amount of an object based on digital image diffraction. The method comprises the following steps: (1) respectively selecting an analysis region from two images before and after the deformation of the object; (2) obtaining the first transform result before the deformation of the object and the second transform result after the deformation of the object through the Fast Fourier Transform, and then obtaining the conversion result function, and further obtaining the fifth function, the sixth function and the integral pixel displacement produced by the deformation of the object; (3) Fourier transform being performed on the sixth function, and the spectrumvalue in the range of (k+1)*(k+1) is calculated with the coordinate point of the integer pixel point in the enlarged spectrum domain as the center; (4) obtaining the difference between the row and column coordinates corresponding to the maximum value of the spectrum matrix and the center of the spectrum matrix, so as to obtain the deformation amount of the object with sub-pixel accuracy. The method for quickly obtaining the deformation amount of an object provided by the invention has high flexibility and strong applicability.

Description

technical field [0001] The invention belongs to the technical field related to engineering measurement, and more specifically relates to a method for quickly acquiring deformation 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 currently. The large size of these large engineering structures makes it difficult and dangerous for people to carry measuring instruments to carry out measurements. [0003] At present, the initial appearance of the image vision system has proposed a feasible way to solve this problem. The deformation method of large-scale structures measured by digital images has the characteristics of long-distance, non-destructive, full-field, high degree of automation, and fast data transmission. However, The measurement accuracy depends on the physical resolution of the digital image, ...

AI Technical Summary

Problems solved by technology

[0003] At present, the initial appearance of the image vision system has proposed a feasible way to solve this problem. The deformation method of large-scale structures measured by digital images has the characteristics of long-distance, non-destructive, full-field, high degree of automation, and fast data transmission. However, The measurement accuracy depends on the physical resolution of the digital image, which has great limitations and is not conducive to popularization and application

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