CN106546521A - A kind of method that soil macropore spacial framework is quantified based on CT scan technology - Google Patents
A kind of method that soil macropore spacial framework is quantified based on CT scan technology Download PDFInfo
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- CN106546521A CN106546521A CN201610888115.8A CN201610888115A CN106546521A CN 106546521 A CN106546521 A CN 106546521A CN 201610888115 A CN201610888115 A CN 201610888115A CN 106546521 A CN106546521 A CN 106546521A
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- 239000002689 soil Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000002591 computed tomography Methods 0.000 title claims abstract description 34
- 238000005516 engineering process Methods 0.000 title claims abstract description 15
- 238000012800 visualization Methods 0.000 claims abstract description 12
- 238000004445 quantitative analysis Methods 0.000 claims abstract description 8
- 238000009877 rendering Methods 0.000 claims description 12
- 210000000867 larynx Anatomy 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 8
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 abstract description 3
- 238000005527 soil sampling Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 238000013139 quantization Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/70—Denoising; Smoothing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10072—Tomographic images
- G06T2207/10081—Computed x-ray tomography [CT]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30181—Earth observation
- G06T2207/30188—Vegetation; Agriculture
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Abstract
The invention discloses a kind of method for quantifying soil macropore spacial framework based on CT scan technology, comprises the steps：Sample collection, CT scan, selected threshold, data strengthen, image cuts and binaryzation, three-dimensional visualization, three-dimensional quantitative analysis.Beneficial effects of the present invention：Sampled using professional original-state soil sampling instrument, reduce the disturbance in undisturbed soil gatherer process；CT scan instrument is combined with professional three dimensional analysis software, using most suitable threshold segmentation method, realizes the three-dimensional quantitative analysis to soil macropore space structure.
Description
Technical field
The invention belongs to agricultural engineering technology field, and in particular to a kind of to quantify soil macropore sky based on CT scan technology
Between network structure method.
Background technology
Tradition determines the method for soil macropore mainly decoration method, microtomy, label breakthrough curve method and soil
Power infiltrates meter method.These method generally existing problems, the system for being concentrated mainly on the destruction and presence caused to undisturbed soil are missed
Difference aspect.At present, some researchers are studied CT scan method as soil macropore spacial framework in the world
Leading edge method, but due to scanning cost, and be sampled into the restriction of present aspect, this method is not extensively applied, in state
Application in interior agrology is even more few.In the world, although this method has been applied, but the method for sampling is adopted
It is larger with artificial method for digging perturbation；In terms of three-dimensional visualization and quantization, threshold segmentation method choose and pore throat analysis
Aspect remains unsolved problem.Although in addition, having scholar to start with CT scan research soil macropore structure, master at home
If based on the analysis of two dimension, not realizing three-dimensional quantitative analysis；Mainly by means of CT scanner in terms of analysis software
The use for carrying the professional softwares such as the open source software such as software or Image J, Avizo it is less.
The content of the invention
For the above-mentioned technical problem in correlation technique, the present invention proposes a kind of based on CT scan technology quantization soil macropore
The method of gap spacial framework, to solve the above problems.
To realize above-mentioned technical purpose, the technical scheme is that what is be achieved in that：
A kind of method for quantifying soil macropore spacial framework based on CT scan technology, comprises the steps：
S1, sample collection：By pvc pipe one, soil is slowly pressed into, whole pvc pipe one is sealed and sealed with PVC lids after taking out
It is stifled, obtain intact core；
S2, CT scan：Sample is lain against CT scan equipment to be scanned；
S3, selected threshold：
S3.1, from the other collecting part soil sample in sample ground, sieve through 2mm, be backfilling in pvc pipe one, be fabricated to backfill earth pillar, returning
Banket and the pvc pipe two of a closed at both ends buried in post, a groove is done on two tube wall of pvc pipe, groove measure it is actual away from
From；
S3.2, backfill earth pillar is lain against CT scan equipment and is scanned；
S3.3, will scan through after picture import Avizo softwares, through image enhancement processing, by adjusting the ash that Avizo is provided
Degree histogram figures determine a hole threshold value, constantly adjust the size of this threshold value, and recessed according to measured by under present threshold value
Slot distance is contrasted with actual range, until measurement distance is less than 1% with the error of actual range, obtains threshold value；
S4, data strengthen：Image obtained by CT scan is imported to and is rebuild in Avizo softwares, and FFT is passed through to image
Two kinds of filters of filter and Gaussian filter eliminate image noise, strengthen picture quality；
S5, image cutting and binaryzation：By Avizo cutting tools, chosen area, the crack that portion disturbances are produced is rejected；Will
The threshold value that threshold process is obtained, is applied to whole pedotheque, obtains the binary map of soil macropore；
S6, three-dimensional visualization：By the volume rendering module volume rendering and surface rendering module of Avizo softwares
Isosurface rendering, realize the three-dimensional visualization of soil macropore；
S7, three-dimensional quantitative analysis：
S7.1, soil macropore degree is obtained by the volume parts volume fraction of Avizo softwares；And/or
S7.2, can obtain regarding each independent soil macropore as an object by auto skeleton modules, analyze
The position of each object, angle, ligancy, volume, surface area, nodes, Node distribution, hydraulic radius, length, line segment number,
End node points, branch node number and isolated node, and the cumulative volume of soil macropore in whole sample is analyzed, total length,
Total nodes, total end node points, total score nodes, total isolated node, macrovoid quantity, average length, average hydraulic half
Footpath, total length；And/or
S7.3, hole, larynx feature that soil macropore is calculated using pore network model Pores Network Model.
Preferably, the pipe range of the pvc pipe one is 50cm, internal diameter 10cm.
Preferably, a diameter of 2cm of the pvc pipe two.
Preferably, in step S2 neutralization procedure S3, the parameter of CT scan equipment is voltage 140KV, electric current 200mA, is scanned
Spacing 0.625mm.
Further, in step S6, while realizing three-dimensional visualization and make video.
Further, in step S7.3, the hole of soil macropore, larynx feature include hole, the volume of larynx, internal surface area, water
Power radius.
Beneficial effects of the present invention：Sampled using professional original-state soil sampling instrument, reduced in undisturbed soil gatherer process
Disturbance；CT scan instrument is combined with professional three dimensional analysis software, using most suitable threshold segmentation method, is realized big to soil
The three-dimensional quantitative analysis of interstitial space structure.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing that needs are used is briefly described, it should be apparent that, drawings in the following description are only some enforcements of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can be being obtained according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the structural representation of backfill earth pillar described according to embodiments of the present invention；
Fig. 2 is the structural representation of pvc pipe two described according to embodiments of the present invention.
Wherein：
1st, backfill earth pillar；2nd, pvc pipe two；3rd, groove；4th, actual range.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, the every other embodiment obtained by those of ordinary skill in the art belong to present invention protection
Scope.
As shown in Figure 1-2, one kind described according to embodiments of the present invention quantifies soil macropore sky based on CT scan technology
Between network structure method, comprise the steps：
S1, sample collection：By pvc pipe one, soil is slowly pressed into, whole pvc pipe one is sealed and sealed with PVC lids after taking out
It is stifled, obtain intact core；
S2, CT scan：Sample is lain against CT scan equipment to be scanned；
S3, selected threshold：
S3.1, from the other collecting part soil sample in sample ground, sieve through 2mm, be backfilling in pvc pipe one, be fabricated to backfill earth pillar 1,
The pvc pipe 22 of a closed at both ends is buried in backfill earth pillar 1, a groove 3 is done on 22 tube wall of pvc pipe, is measured at groove 3
Actual range 4；
S3.2, backfill earth pillar 1 is lain against CT scan equipment and is scanned；
S3.3, will scan through after picture import Avizo softwares, through image enhancement processing, by adjusting the ash that Avizo is provided
Degree histogram figures determine a hole threshold value, constantly adjust the size of this threshold value, and recessed according to measured by under present threshold value
Slot distance is contrasted with actual range 4, until measurement distance is less than 1% with the error of actual range, obtains threshold value；
S4, data strengthen：Image obtained by CT scan is imported to and is rebuild in Avizo softwares, and FFT is passed through to image
Two kinds of filters of filter and Gaussian filter eliminate image noise, strengthen picture quality；
S5, image cutting and binaryzation：By Avizo cutting tools, chosen area, the crack that portion disturbances are produced is rejected；Will
The threshold value that threshold process is obtained, is applied to whole pedotheque, obtains the binary map of soil macropore；
S6, three-dimensional visualization：By the volume rendering module volume rendering and surface rendering module of Avizo softwares
Isosurface rendering, realize the three-dimensional visualization of soil macropore；
S7, three-dimensional quantitative analysis：
S7.1, soil macropore degree is obtained by the volume parts volume fraction of Avizo softwares；And/or
S7.2, can obtain regarding each independent soil macropore as an object by auto skeleton modules, analyze
The position of each object, angle, ligancy, volume, surface area, nodes, Node distribution, hydraulic radius, length, line segment number,
End node points, branch node number and isolated node, and the cumulative volume of soil macropore in whole sample is analyzed, total length,
Total nodes, total end node points, total score nodes, total isolated node, macrovoid quantity, average length, average hydraulic half
Footpath, total length；Or
S7.3, hole, larynx feature that soil macropore is calculated using pore network model Pores Network Model.
The pipe range of the pvc pipe one is 50cm, internal diameter 10cm.
A diameter of 2cm of the pvc pipe two.
In step S2 neutralization procedure S3, the parameter of CT scan equipment is voltage 140KV, electric current 200mA, sweep span
0.625mm。
In step S6, while realizing three-dimensional visualization and video is made.
In step S7.3, the hole of soil macropore, larynx feature include hole, the volume of larynx, internal surface area, hydraulic radius.
Lysimeters sampling systems are a kind of special soil sampling systems developed recently in the world at present, at home
Also someone has invented GEOPROBE Sampling Machines, can be used for the sampling work of early stage soil.The present invention adopts CT scan and Avizo
The method that software combines, analyzes the spacial framework of soil macropore.Using Global thresholding and growth method in Avizo
The threshold method for combining, realizes the visualization of soil macropore spacial framework.And with reference to the skeletonization method reality of software
The three-dimensional quantitative analysis of existing soil macropore space structure, these quantized datas include soil macropore degree, soil macropore number
Amount, equivalent diameter, ligancy, pore throat quantity etc..
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (6)
1. it is a kind of based on CT scan technology quantify soil macropore spacial framework method, it is characterised in that：Including as follows
Step：
S1, sample collection：By pvc pipe one, soil is slowly pressed into, whole pvc pipe one is sealed and sealed with PVC lids after taking out
It is stifled, obtain intact core；
S2, CT scan：Sample is lain against CT scan equipment to be scanned；
S3, selected threshold：Further include：
S3.1, from the other collecting part soil sample in sample ground, sieve through 2mm, be backfilling in pvc pipe one, be fabricated to backfill earth pillar, returning
Banket and the pvc pipe two of a closed at both ends buried in post, a groove is done on two tube wall of pvc pipe, groove measure it is actual away from
From；
S3.2, backfill earth pillar is lain against CT scan equipment and is scanned；
S3.3, will scan through after picture import Avizo softwares, through image enhancement processing, by adjusting the ash that Avizo is provided
Degree histogram figures determine a hole threshold value, constantly adjust the size of this threshold value, and recessed according to measured by under present threshold value
Slot distance is contrasted with actual range, until measurement distance is less than 1% with the error of actual range, obtains threshold value；
S4, data strengthen：Image obtained by CT scan is imported to and is rebuild in Avizo softwares, and FFT is passed through to image
Two kinds of filters of filter and Gaussian filter eliminate image noise, strengthen picture quality；
S5, image cutting and binaryzation：By Avizo cutting tools, chosen area, the crack that portion disturbances are produced is rejected；Will
The threshold value that threshold process is obtained, is applied to whole pedotheque, obtains the binary map of soil macropore；
S6, three-dimensional visualization：By the volume rendering module volume rendering and surface rendering module of Avizo softwares
Isosurface rendering, realize the three-dimensional visualization of soil macropore；
S7, three-dimensional quantitative analysis：
S7.1, soil macropore degree is obtained by the volume parts volume fraction of Avizo softwares；And/or
S7.2, can obtain regarding each independent soil macropore as an object by auto skeleton modules, analyze
The position of each object, angle, ligancy, volume, surface area, nodes, Node distribution, hydraulic radius, length, line segment number,
End node points, branch node number and isolated node, and the cumulative volume of soil macropore in whole sample is analyzed, total length,
Total nodes, total end node points, total score nodes, total isolated node, macrovoid quantity, average length, average hydraulic half
Footpath, total length；And/or
S7.3, hole, larynx feature that soil macropore is calculated using pore network model Pores Network Model.
2. according to claim 1 based on CT scan technology quantify soil macropore spacial framework method, its
It is characterised by：The pipe range of the pvc pipe one is 50cm, internal diameter 10cm.
3. the method for quantifying soil macropore spacial framework based on CT scan technology according to claim 1, which is special
Levy and be：A diameter of 2cm of the pvc pipe two.
4. according to claim 1 based on CT scan technology quantify soil macropore spacial framework method, its
It is characterised by：In step S2 neutralization procedure S3, the parameter of CT scan equipment is voltage 140KV, electric current 200mA, sweep span
0.625mm。
5. according to claim 1 based on CT scan technology quantify soil macropore spacial framework method, its
It is characterised by：In step S6, while realizing three-dimensional visualization and video is made.
6. according to claim 1 based on CT scan technology quantify soil macropore spacial framework method, its
It is characterised by：In step S7.3, the hole of soil macropore, larynx feature include hole, the volume of larynx, internal surface area, hydraulic radius.
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| CN107941670A (en) * | 2017-11-03 | 2018-04-20 | 中国石油天然气股份有限公司 | Rock debris porosity determination method |
| CN107941673A (en) * | 2017-11-21 | 2018-04-20 | 南京农业大学 | A kind of salt affected soil pore structure measures analysis method |
| CN108061697A (en) * | 2017-12-06 | 2018-05-22 | 石家庄铁道大学 | Soil body three-dimensional pore space rate computational methods |
| CN108896589A (en) * | 2018-07-25 | 2018-11-27 | 中国科学院武汉岩土力学研究所 | The evaluation method of bubble size distribution uniformity in a kind of gassiness soil sample |
| CN109242985A (en) * | 2018-10-29 | 2019-01-18 | 中国科学院力学研究所 | A method of pore structure key parameter is determined from 3-D image |
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| CN109946328A (en) * | 2019-04-10 | 2019-06-28 | 中国石油大学(北京) | Fibrous filter Micro-Structure Analysis method and apparatus |
| CN110264459A (en) * | 2019-06-24 | 2019-09-20 | 江苏开放大学（江苏城市职业学院） | A kind of interstices of soil characteristics information extraction method |
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| CN113390905A (en) * | 2021-05-31 | 2021-09-14 | 北京师范大学 | Method for quantifying pore space structure of soil aggregate based on CT scanning technology |
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