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A shale CT image cropping method and system

A CT image and image technology, applied in the shale CT image cropping method and system field based on the morphological closure method, can solve the problems of high sample analysis error, missing sample data, and inaccurate image cropping, so as to reduce errors, High cutting accuracy and improved cutting efficiency

Active Publication Date: 2022-04-08
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above clipping method has a good effect on clipping shale samples with regular shapes, but when analyzing CT images of shale samples with irregular shapes and discontinuous boundaries due to fractures formed by fracturing, the original continuous Breakpoints appear in the boundary of the shale, causing the shale boundary to change from the circular shape of the original sample to an irregular shape. At this time, if the image is cropped with a regular shape, some details of the boundary will inevitably be sacrificed, and because the boundary of each slice is different , the volume of the cropped sample is different when cropping with the same shape, and even cracks that are very close to the boundary may be cropped, which may easily lead to inaccurate cropping of the image, missing some sample data, and resulting in higher error in subsequent sample analysis

Method used

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  • A shale CT image cropping method and system
  • A shale CT image cropping method and system
  • A shale CT image cropping method and system

Examples

Experimental program
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Embodiment 1

[0028] Such as figure 1 As shown, this embodiment is used to provide a shale CT image clipping method, the clipping method comprising:

[0029] S1: Perform CT scanning on the shale sample to obtain multiple slice images; the slice images include the sample area and the background;

[0030] When performing CT scanning, CT scans are carried out at equal intervals along the axial direction of the shale sample, and the cross-section of the shale sample is obtained as a slice. N times are scanned in total to obtain N slice images. Each slice image is represented by a single image. Form storage, a single picture is divided into horizontal and vertical directions.

[0031] S2: For each slice image, use a rectangular mask to roughly cut the slice image to obtain a roughly cut image;

[0032] In the visible area of ​​the CT scanning instrument, that is, in the scanned slice image, the sample area only occupies a part of it, and the rest are all background values. In order to cut mos...

Embodiment 2

[0058] This embodiment is used to provide a shale CT image cropping system, such as image 3 As shown, the clipping system includes:

[0059] The scanning module T1 is used to perform CT scanning on the shale sample to obtain multiple slice images; the slice images include the sample area and the background;

[0060] The rough cutting module T2 is configured to, for each slice image, use a rectangular mask to roughly cut the slice image to obtain a rough cut image;

[0061] A fine cropping module T3, configured to generate a cropping mask based on a morphological closing method for each of the rough cropped images, and use the cropping mask to crop the rough cropped image to obtain a cropped image;

[0062] A judging module T4, configured to judge whether to continue cropping according to all the cropped images and all the sliced ​​images;

[0063] Return to module T5, for if yes, use the cropped image as the rough cropped image in the next cycle, and return "for each of the...

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Abstract

The invention relates to a shale CT image cropping method and system. Firstly, a shale sample is scanned by CT to obtain multiple slice images. Then use a rectangular mask to roughly cut each slice image to obtain a rough cut image, then generate a cut mask based on the morphological closure method, and use the cut mask to cut each rough cut image to get a cut image , which can automatically connect the crack breakpoints located at the sample boundary into continuous boundaries through the morphological closing method, saving the manual connection time for the subsequent formation of the clipping mask. Finally, it is judged whether to continue cropping according to all cropped images and all sliced ​​images. When it is no longer necessary to continue cropping, the cropped image that is closest to the shape of the real shale sample can be obtained. The present invention has high cutting precision, can retain more data at the sample boundary, and reduces the error of subsequent sample analysis.

Description

technical field [0001] The invention relates to the technical field of shale CT image processing, in particular to a shale CT image cropping method and system based on a morphological closing method. Background technique [0002] At present, commercial software is often used in shale CT image cropping. First, all CT scan images of a certain shale sample are imported and combined into a three-dimensional image. Then, based on the principle of ensuring that the cropped image does not contain the peripheral background value as much as possible, adopt Regular cylindrical or cuboid shapes, regular cropping of the combined 3D images, and finally export the graphics for the next step of analysis, or continue the next step of analysis in commercial software. [0003] The above clipping method has a good effect on clipping shale samples with regular shapes, but when analyzing CT images of shale samples with irregular shapes and discontinuous boundaries due to fractures formed by frac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/11G06T7/155G06T7/194
CPCG06T7/11G06T7/155G06T7/194G06T2207/10081G06T2207/20132
Inventor 张珂薛雷陈竑然许超翟梦阳崔远
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI