DVC measuring method of article internal deformation

Abstract

The invention provides a DVC measuring method of article internal deformation. The method includes the steps of S1, positioning the integer pixel displacement of an initial point, and solving the sub-pixel displacement field of the initial point by using a sub-pixel displacement positioning method based on gradient; S2, calculating the three-dimensional deformation field of the initial point by using a Newton iteration method; S3, calculating the three-dimensional deformation field of other pixel points through the Newton iteration method according to the initial point whose three-dimensionaldeformation field is calculated. Compared with the related technology, the DVC measuring method of the article internal deformation can be applied to the rapid high-precision measurement of the article internal deformation; the method is simple in calculation and implementation, strong in anti-noise ability, and good in measurement effect on the tiny internal deformation of an article; meanwhile,the high-efficiency calculation of the DVC algorithm under serial line design is realized, the complexity of gravity calculation is much lower than that of the calculation of the integer pixel displacement field of one point, repeated global search can be avoided through extended search, and accordingly the calculation complexity is greatly lowered.

Description

technical field [0001] The invention relates to the field of digital image measurement of internal deformation of objects, in particular to a DVC measurement method for internal deformation of objects. Background technique [0002] X-ray micro-computed tomography (uCT) imaging is a digital method that allows researchers to visualize the internal structure of object structure without destroying the characteristics of objects, and is widely used in various data acquisition, such as bones. With the development of research and the improvement of computer performance, many numerical methods based on CT image processing, such as micro-finite element method, digital image correlation (DVC), etc., have been proposed and applied to experimental simulations. [0003] In 1999, Bay et al proposed the digital volume image correlation (DVC) method, which can directly measure the internal pressure deformation of the volume image after bone tissue reconstruction. As a direct extension of t...

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Problems solved by technology

[0006] The technical problem solved by the present invention is to provide a DVC measurement method for the internal deformation of an object, which solves the problem of relatively low accuracy and calculation efficiency of the current DVC algorithm

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