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Error compensation method applicable to rotation axis swing angle of neutron chromatography imaging system

A technology of neutron tomography and rotation axis, which is applied in image analysis, image data processing, 3D modeling, etc., can solve the problem of uneven distribution of fault definition, which affects the accuracy of 3D reconstruction model and the reliability of feature information measurement. Reliability and other issues

Inactive Publication Date: 2016-02-10
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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Problems solved by technology

If the calculation is still performed according to a constant during image reconstruction, it will result in Y d The uneven distribution of the resolution of the reconstructed faults in the axial direction affects the accuracy of the 3D reconstruction model and the reliability of feature information measurement

Method used

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  • Error compensation method applicable to rotation axis swing angle of neutron chromatography imaging system
  • Error compensation method applicable to rotation axis swing angle of neutron chromatography imaging system
  • Error compensation method applicable to rotation axis swing angle of neutron chromatography imaging system

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Experimental program
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Embodiment example

[0124] The parameters of the scanning device used in the experiment are as follows:

[0125] (1) Neutron source: cold neutron source

[0126] (2) Area array detector: the imaging size is 2048×2048, and the pixel size is 0.2mm.

[0127] Experimental steps:

[0128] (1) Place a tested sample on the scanning platform, start the scanning platform to rotate to drive the tested sample to rotate 360° step by step, with a step angle of 0.5°, and collect 720 projection images in total. Ostu threshold segmentation is performed on all projection images to obtain 720 segmented projection images; then all the segmentation projection images are superimposed into a two-dimensional matrix, which is the composite projection image P ave ,Such as Figure 4 shown.

[0129] (2) According to the step of obtaining gradient angle and gradient angle histogram in the method of the present invention, obtain the synthetic projection image P ave The gradient angles of all pixels, and the histogram F(...

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Abstract

The present invention discloses an error compensation method of a rotation axis swing angle of a neutron chromatography imaging system. The method comprises: based on a projection geometrical symmetry principle of a parallel neutron beam, superimposing projection data within a range of 360 degree rotation of a sample to obtain a synthetic projection image with a unique symmetry axis, wherein, the symmetry axis of the synthetic projection image is a projection line of a rotation axis of the sample; further calculating out a pixel value gradient angle histogram of the synthetic projection image, wherein distribution of the histogram is an even function; and calculating a symmetry center of the even function, wherein a gradient angle corresponding to the symmetry center position is a swing angle of the rotation axis. By using the measured rotation angle as a correction parameter and introducing the correction parameter into a reconstruction algorithm, error compensation for the swing angle of the rotation axis can be realized, so that consistency of a definition of each reconstruction tomography of the sample is ensured, and reconstruction accuracy is effectively improved.

Description

technical field [0001] The invention relates to an error compensation method for the deflection angle of the rotation axis of neutron tomography imaging, which can be used for non-destructive testing and industrial computer tomography in the field of neutron photography. Background technique [0002] Neutron radiography has advantages over X-rays in the detection of hydrogen-containing materials, heavy metal component structures, different elements with similar atomic numbers, and radioactive materials. Therefore, it has important applications in military, aviation, aerospace, archaeology and other fields. As an important branch of neutron radiography - neutron CT (Computed Tomography, computerized tomography) has also received increasing attention and rapid development, and has played an important role in detecting the internal structure and quality status of samples. [0003] figure 1 It is a tomographic scanning principle diagram of a traditional neutron tomography syste...

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Application Information

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IPC IPC(8): G06T17/00G06T7/00
Inventor 唐彬霍合勇吴洋孙勇尹伟王胜李航曹超刘斌朱世雷张旸
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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