Digital image measurement method based on feature matching

A feature matching and digital image technology, applied in the field of optical measurement, can solve the problems of parallel digital image correlation method that is difficult to achieve path independence, and is not applicable, so as to improve robustness and accuracy, improve stability, real-time displacement and Effect of strain measurement

Active Publication Date: 2020-06-30
XI AN JIAOTONG UNIV
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Problems solved by technology

[0003] Feature matching algorithm can provide accurate and reliable displacement initial value for digital image correlation matching algorithm, and then perform sub-pixel precision displacement calculation. However, it is difficult to realize path-independent parallel digital image correlation method only relying on a small number of feature points.
The fast Fourier transform cross-correlation algorithm can realize the image matching of the whole pixel, but this method is not suitable for the deformation situation with large displacement

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  • Digital image measurement method based on feature matching
  • Digital image measurement method based on feature matching
  • Digital image measurement method based on feature matching

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[0037] The following will refer to the attached Figure 1 to Figure 2 Specific examples of the present invention are described in more detail. Although specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and is not limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0038] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art should understand that they may use different terms to refer to the same component. The specification and claims do not use differences in nouns as a way of distinguishing components, but use differences in functions of components as a criterion for distinguishing. "Includes" or "comprises" mentioned throughout ...

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Abstract

The invention discloses a digital image measurement method based on feature matching. The method comprises the following steps: selecting a to-be-calculated point of the to-be-measured area; acquiringa speckle image; determining an area to be measured on the speckle image; selecting a point to be calculated in the area to be measured; dividing the point to be calculated into sub-regions, dividingeach point to be calculated into a square subarea with the side length of m, and extracting feature descriptors from all pixels in each sub-region, performing feature matching through a PatchMatch feature matching algorithm based on the feature descriptors, calculating initial displacement based on a feature matching result, and executing reverse combined Gaussian Newton iterative algorithm real-time displacement and strain in parallel based on the initial displacement.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, in particular to a digital image measurement method based on feature matching. Background technique [0002] The traditional digital image correlation method cannot support online real-time detection at present, which makes this method limited in practical application and cannot meet the requirements of fast and efficient measurement, especially in the case of large displacements, there is no one that can be used for Real-time digital image correlation for large deformations. Therefore, there is an urgent need for a real-time digital image correlation method for on-line displacement and deformation measurement to expand its application. [0003] Feature matching algorithm can provide accurate and reliable displacement initial value for digital image correlation matching algorithm, and then perform displacement calculation with sub-pixel precision. However, it is difficult to realize ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/60G06K9/62
CPCG06T7/60G06T2207/10004G06V10/751
Inventor 梁晋李文攀魏小康张继耀叶美图
Owner XI AN JIAOTONG UNIV
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