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Non-uniform displacement post-processing method and device related to digital image

A post-processing device and digital image technology, applied in image data processing, image enhancement, image analysis, etc., can solve the problem of aggravating the mismatch between the deformation function and the real deformation, increasing the complexity and time of calculation, and improving the sensitivity of image noise, etc. problem, to achieve the effect of simple and convenient calculation process, simple and convenient calculation, and simple and convenient calculation

Active Publication Date: 2020-05-08
HOHAI UNIV
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Problems solved by technology

However, although the random error in the correlation search process can be effectively suppressed by increasing the size of the sub-region, it will aggravate the mismatch between the shape function and the real deformation
Although reducing the size of the sub-area can significantly reduce the systematic error caused by the mismatch of the shape function, the measurement random error will increase significantly until it cannot converge, and increasing the order of the shape function will significantly increase the computational complexity and computational complexity. time while increasing sensitivity to image noise and reducing measurement robustness

Method used

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  • Non-uniform displacement post-processing method and device related to digital image
  • Non-uniform displacement post-processing method and device related to digital image
  • Non-uniform displacement post-processing method and device related to digital image

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Embodiment 1

[0069] In this embodiment, Bornert et al., see Bornert M, F.Brémand, Doumalin P, etal.Assessment of Digital Image Correlation Measurement Errors:Methodology and Results[J].Exp.Mech.2009;49(3):353- The Perlin noise function generation method used in 370 is used as a speckle pattern generation algorithm to generate simulated speckle patterns before and after deformation. Among them, the image size is 128×512 pixels, and the speckle size parameter is set to 4 pixels. Set the vertical deformation field as v(x)=0, and the horizontal deformation field according to the following formula:

[0070]

[0071] Use the digital image correlation method based on the first-order shape function to operate the simulated speckle image to obtain the data of the lateral displacement field. The first-order shape function used is as follows:

[0072]

[0073] Among them, x and y are the x-axis pixels and y-axis pixels of the image sub-area respectively; x 0 and y 0 are the center point disp...

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Abstract

The invention discloses a non-uniform displacement post-processing method and a non-uniform displacement post-processing device related to a digital image. m is a control parameter directly related tothe highest order of the real displacement field data f and is a binomial coefficient, f1 is a result displacement field calculated by using digital image correlation when i is 1, and fi is data obtained by i-1 times of filtering of f1 when i is an integer greater than 1; wherein n is the highest order number of the polynomial of the real displacement field data f; wherein f1 is data obtained byi-1 times of filtering, i is an integer greater than 1, and the size of a filtering window is the same as the size of a sub-region of correlation operation for filtering. The invention is simple and convenient in operation, small in operation amount and easy to implement, and more importantly, system errors caused by mismatching of shape functions are eliminated, so that the displacement measurement precision is greatly improved.

Description

technical field [0001] The invention relates to a digital image-related non-uniform displacement post-processing method and device, belonging to the technical field of optical measurement and non-destructive detection. Background technique [0002] Digital Image Correlation (DIGITAL IMAGE CORRELATION) method is a fast-growing full-field non-destructive measurement technology in the field of optical measurement, which is widely used in civil engineering transportation, material testing, industrial monitoring, biomedicine, building structures and other fields. The digital images before and after deformation are compared and analyzed, and the reference sub-area and the deformed sub-area are matched, evaluated, and searched and analyzed through a predefined shape function (usually a first-order shape function) to obtain the displacement of each point in the target area to form a displacement Field data, the strain field data is extracted from the displacement field data using me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G01B11/02
CPCG01B11/02G06T2207/20024G06T5/80
Inventor 白鹏翔朱飞鹏雷冬
Owner HOHAI UNIV
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