A Measuring Method of Industrial CT Geometric Dimensions Based on Image Restoration

A technology of geometric dimensions and measurement methods, which is applied in the direction of measuring devices, instruments, and wave/particle radiation, to achieve good geometric dimension measurement accuracy and the effect of suppressing fuzzy degradation effects

Active Publication Date: 2017-10-24
THE PLA INFORMATION ENG UNIV
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Problems solved by technology

[0005] The present invention overcomes the problem that some industrial CT geometric dimension measurement methods still need to be improved in the prior art, and provides an industrial CT geometric dimension measurement method based on image restoration that can simultaneously reduce the degree of CT image blur degradation and has high precision

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  • A Measuring Method of Industrial CT Geometric Dimensions Based on Image Restoration
  • A Measuring Method of Industrial CT Geometric Dimensions Based on Image Restoration
  • A Measuring Method of Industrial CT Geometric Dimensions Based on Image Restoration

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[0021] The industrial CT geometric dimension measurement method based on image restoration of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0022] The present invention is achieved through the following technical solutions, as attached figure 1 As shown, the specific steps are as follows:

[0023] (1) Projection data collection. Under the premise of ensuring that it can be penetrated by X-rays, the projection of the object to be measured and the ball of known size is scanned together;

[0024] (2) Reconstruction of the CT image after beam hardening correction. Directly aiming at the original projection data collected in step (1), by constructing an exponential model, using the gray entropy with penalty item constraints as the cost function, using the simplex method to iteratively solve the beam hardening correction parameters, and the corrected projection perform image reconstruction;

[0025...

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Abstract

The invention discloses an image restoration-based industrial CT geometric dimension measurement method, which overcomes the problem that some industrial CT geometric dimension measurement methods still need to be improved in the prior art. The specific steps of the invention are as follows: (1) acquisition of projection data; (2) reconstruction of CT image after beam hardening correction; (3) calculation of two-dimensional PSF; (4) image restoration; (5) geometric dimension measurement. Compared with the prior art, the image restoration-based industrial CT geometric dimension measurement method of the present invention has the following advantages: the fuzzy degradation effect of the CT image restored by the inventive method can be effectively suppressed, and a better geometric dimension can be obtained measurement accuracy.

Description

technical field [0001] The invention relates to a method for measuring the geometric dimension of an object, in particular to a method for measuring the geometric dimension of an industrial CT based on image restoration. Background technique [0002] Geometric dimension measurement is a key link in reverse engineering. The geometric dimension measurement method based on industrial computed tomography (CT) reconstructs the CT image of the object by collecting X-ray projections at different angles, and completes the geometric dimension measurement based on the CT image. Its advantage is reflected in the non-destructive measurement of the external and internal structural geometry of objects. The size measurement method based on industrial CT can effectively make up for the shortcomings of traditional measurement methods that can only measure the outer surface structure of objects, and is especially suitable for reverse engineering, rapid prototyping, 3D printing and other appli...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B15/00
Inventor 闫镔李磊张翔席晓琦张峰陈思宇王敬雨乔凯
Owner THE PLA INFORMATION ENG UNIV
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