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Method for correcting deviation of projected image rotating center in Micro CT system

A technology of projection image and rotation center, which is applied in the field of computer projection image offset processing, can solve problems such as rotation center error, and achieve good results.

Inactive Publication Date: 2009-06-03
苏州和君科技发展有限公司 +1
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Problems solved by technology

[0008] The main purpose of the present invention is to provide a method for correcting the deviation of the rotation center of the projected image in a Micro CT system, which solves the problem of errors between the actual rotation center and the designed rotation center in the prior art

Method used

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  • Method for correcting deviation of projected image rotating center in Micro CT system
  • Method for correcting deviation of projected image rotating center in Micro CT system
  • Method for correcting deviation of projected image rotating center in Micro CT system

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Embodiment Construction

[0039] In order to describe the technical solution of the above-mentioned invention in more detail, the following inventors list specific examples to illustrate the technical effects; it should be emphasized that these examples are used to illustrate the present invention and not limit the scope of the present invention.

[0040] Embodiment A group of 400 12-bit 720*720 projected image rotation center offset correction steps

[0041] Such as figure 2 ,Specific steps are as follows:

[0042] 1. According to the gray level difference of the projected image, select an appropriate threshold and perform binarization on the projected image.

[0043] According to the actual situation, the average value calculated by arbitrarily selecting a background area is 3684, and the gray value of the target object generally does not exceed 2500. The threshold selected based on these two values ​​is T=3000. Since the gray value of the background part is not much different, an area of ​​the ba...

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Abstract

The invention discloses a method for correcting deviation of a projected image rotating center in a Micro CT system comprising the following steps: appropriate threshold value is selected according to grayscale difference of projected images to carry out binarization treatment on the selected projected images with different angles; black pixels of the projected images after binarization treatment are measured to obtain projective centers of all projected images, and all projected images are rotated and projective centers of all projected images after rotation are obtained by measuring, thereby obtaining the rotating centers of the projected images; a valid image is determined and intercepted according to the rotating centers of the projected images and the distance of the two sides of the projected images to rebuild the image. By adopting the method, the image can be rebuilt by intercepting the valid image of the projected images according to the actual rotating center; the method has good effects and is convenient and feasible.

Description

technical field [0001] The invention belongs to the field of offset processing of computer projection images, and relates to a method for processing tomographic images in a Micro CT system, in particular to a method for correcting the rotation center offset of projection images in a Micro CT system. Background technique [0002] In the Micro CT system, the reconstruction of the tomographic image can obtain the internal image information of the measured object, which has the characteristics that other non-destructive testing methods cannot replace, and has broad application prospects in the field of industrial non-destructive testing. The main components of Micro CT system include X-ray source, stage and detector. For cone beam projection, the FDK algorithm and its improved algorithm are generally used. As described in Practicalcone-beam algorithm L.A. Feldkamp, ​​L.C. Davis, and J.W. Kress Research Staff, Ford Motor Company, Dearborn, Michigan 48121, J.Opt.Soc.Am.A / Vol.1, N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00G06T5/00G01N23/04
Inventor 顾宁张蔚罗守华董歌李光
Owner 苏州和君科技发展有限公司
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