CN106546521B - A method of soil macropore spacial framework is quantified based on CT scan technology - Google Patents
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- 239000002689 soil Substances 0.000 title claims abstract description 55
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- 238000002591 computed tomography Methods 0.000 title claims abstract description 34
- 238000005516 engineering process Methods 0.000 title claims abstract description 16
- 238000012800 visualization Methods 0.000 claims abstract description 12
- 238000013139 quantization Methods 0.000 claims abstract description 11
- 238000004445 quantitative analysis Methods 0.000 claims abstract description 8
- 230000002708 enhancing effect Effects 0.000 claims abstract description 4
- 239000011148 porous material Substances 0.000 claims description 17
- 238000009877 rendering Methods 0.000 claims description 12
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
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- 238000006386 neutralization reaction Methods 0.000 claims description 3
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- 230000011218 segmentation Effects 0.000 abstract description 3
- 238000005527 soil sampling Methods 0.000 abstract description 3
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Abstract
The invention discloses a kind of methods based on CT scan technology quantization soil macropore spacial framework, include the following steps: sample acquisition, CT scan, selected threshold, data enhancing, image cutting and binaryzation, three-dimensional visualization, three-dimensional quantitative analysis.Beneficial effects of the present invention: it is sampled using professional original-state soil sampling instrument, reduces the disturbance in undisturbed soil collection 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 fields, and in particular to one kind is empty based on CT scan technology quantization soil macropore
Between network structure method.
Background technique
The method of tradition measurement soil macropore mainly has decoration method, microtomy, marker breakthrough curve method and soil
Power infiltrates meter method.The generally existing problem of these methods is concentrated mainly on destruction and existing system caused by undisturbed soil and misses
Poor aspect.Currently, 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 limitation of present aspect, this method is not widely applied, in state
Application in interior agrology is even more fewer and fewer.In the world, although this method has been applied, the method for sampling is adopted
Manually method for digging perturbation is larger；Three-dimensional visualization and quantization aspect, threshold segmentation method chooses and the analysis of pore throat
Aspect remains unsolved problem.Although in addition, there is scholar to start with CT scan research soil macropore structure, master at home
If being based on two-dimensional analysis, there is no realizing three-dimensional quantitative analysis；In analysis software aspects mainly by means of CT scanner
Included software or the open source softwares such as Image J, the professional softwares such as Avizo using less.
Summary of the invention
For above-mentioned technical problem in the related technology, 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 the above-mentioned technical purpose, the technical scheme of the present invention is realized as follows:
A method of soil macropore spacial framework is quantified based on CT scan technology, is included the following steps:
S1, sample acquisition: being slowly pressed into soil for pvc pipe one, entire pvc pipe one be sealed after taking out with PVC lid and
It blocks, obtains intact core；
S2, CT scan: sample is lain against into CT scan equipment and is scanned；
S3, selected threshold:
S3.1, from sample other collecting part soil sample, sieve by 2mm, are backfilling into pvc pipe one, be fabricated to backfill earth pillar,
A pvc pipe two closed at both ends is buried in backfill earth pillar, a groove is done on two tube wall of pvc pipe, measures reality in groove
Border distance；
S3.2, backfill earth pillar is lain against CT scan equipment and is scanned；
S3.3, will scan through after picture import Avizo software, by image enhancement processing, by adjusting Avizo offer
Gray scale histogram scheme to determine a hole threshold value, constantly adjust the size of this threshold value, and according to measured under present threshold value
Groove distance and actual range compare, until the groove distance of measurement and the error of actual range are less than 1%, obtain threshold value；
S4, data enhancing: the resulting image of CT scan is imported into Avizo software and is rebuild, and image is passed through
Two kinds of filters of FFT filter and Gaussian filter eliminate image noise, enhance picture quality；
S5, image cutting and binaryzation: by Avizo cutting tool, chosen area rejects splitting for portion disturbances generation
Gap；The threshold application that threshold process is obtained obtains the binary map of soil macropore in entire pedotheque；
S6, three-dimensional visualization: pass through the volume rendering module volume rendering and surface rendering mould of Avizo software
Block isosurface rendering, realizes 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 software；And/or
S7.2, regard each independent soil macropore as an object by the way that auto skeleton module is available,
Analyze position, the angle, ligancy, volume, surface area, number of nodes, Node distribution, hydraulic radius, length, line segment of each object
The total volume of soil macropore, overall length in number, end node points, branch node number and isolated node, and the entire sample of analysis
Degree, total node number, total end node points, total score branch number of nodes, total isolated node, macrovoid quantity, average length, average hydraulic
Radius, total length；And/or
S7.3, the pore throat characteristic 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, the diameter of the pvc pipe two is 2cm.
Preferably, in step S2 neutralization procedure S3, the parameter of CT scan equipment is voltage 140KV, electric current 200mA, scanning
Spacing 0.625mm.
Further, it in step S6, realizes while three-dimensional visualization and makes video.
Further, in step S7.3, the pore throat characteristic of soil macropore includes the volume of pore throat, internal surface area, waterpower
Radius.
Beneficial effects of the present invention: it is sampled, is reduced in undisturbed soil collection process using professional original-state soil sampling instrument
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.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of the backfill earth pillar described according to embodiments of the present invention；
Fig. 2 is the structural schematic diagram of the pvc pipe two described according to embodiments of the present invention.
Wherein:
1, earth pillar is backfilled；2, pvc pipe two；3, groove；4, actual range.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's every other embodiment obtained belong to what the present invention protected
Range.
As shown in Figs. 1-2, it is empty to be based on CT scan technology quantization soil macropore for described one kind according to embodiments of the present invention
Between network structure method, include the following steps:
S1, sample acquisition: being slowly pressed into soil for pvc pipe one, entire pvc pipe one be sealed after taking out with PVC lid and
It blocks, obtains intact core；
S2, CT scan: sample is lain against into CT scan equipment and is scanned；
S3, selected threshold:
S3.1, from sample other collecting part soil sample, sieve by 2mm, are backfilling into pvc pipe one, be fabricated to backfill earth pillar
1, a pvc pipe 22 closed at both ends is buried in backfill earth pillar 1, a groove 3 is done on 22 tube wall of pvc pipe, at groove 3
Measure 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 software, by image enhancement processing, by adjusting Avizo offer
Gray scale histogram scheme to determine a hole threshold value, constantly adjust the size of this threshold value, and according to measured under present threshold value
Groove distance and actual range 4 compare, until the groove distance of measurement and the error of actual range are less than 1%, obtain threshold value；
S4, data enhancing: the resulting image of CT scan is imported into Avizo software and is rebuild, and image is passed through
Two kinds of filters of FFT filter and Gaussian filter eliminate image noise, enhance picture quality；
S5, image cutting and binaryzation: by Avizo cutting tool, chosen area rejects splitting for portion disturbances generation
Gap；The threshold application that threshold process is obtained obtains the binary map of soil macropore in entire pedotheque；
S6, three-dimensional visualization: pass through the volume rendering module volume rendering and surface rendering mould of Avizo software
Block isosurface rendering, realizes 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 software；And/or
S7.2, regard each independent soil macropore as an object by the way that auto skeleton module is available,
Analyze position, the angle, ligancy, volume, surface area, number of nodes, Node distribution, hydraulic radius, length, line segment of each object
The total volume of soil macropore, overall length in number, end node points, branch node number and isolated node, and the entire sample of analysis
Degree, total node number, total end node points, total score branch number of nodes, total isolated node, macrovoid quantity, average length, average hydraulic
Radius, total length；Or
S7.3, the pore throat characteristic 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.
The diameter of the pvc pipe two is 2cm.
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, realizes while three-dimensional visualization and make video.
In step S7.3, the pore throat characteristic of soil macropore includes the volume of pore throat, internal surface area, hydraulic radius.
Lysimeters sampling system is a kind of special soil sampling system developed recently in the world at present, at home
Also someone has invented GEOPROBE Sampling Machine, can be used for the sampling operation of soil early period.The present invention uses CT scan and Avizo
The method that software combines analyzes the spacial framework of soil macropore.Utilize the Global thresholding and growth method in Avizo
The threshold method combined realizes the visualization of soil macropore spacial framework.And combine the skeletonization method of software real
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..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of method based on CT scan technology quantization soil macropore spacial framework, includes the following steps:
S1, sample acquisition: being slowly pressed into soil for pvc pipe one, and entire pvc pipe one is sealed and is blocked with PVC lid after taking out,
Obtain intact core；
S2, CT scan: sample is lain against into CT scan equipment and is scanned；
S3, selected threshold, it is characterised in that: further comprise:
S3.1, from sample other collecting part soil sample, sieve by 2mm, are backfilling into pvc pipe one, be fabricated to backfill earth pillar, are returning
It bankets and buries a pvc pipe two closed at both ends in column, a groove is done on two tube wall of pvc pipe, the groove distance measured is made
For actual range；
S3.2, backfill earth pillar is lain against CT scan equipment and is scanned；
S3.3, will scan through after picture import Avizo software, by image enhancement processing, the ash that is provided by adjusting Avizo
It spends histogram to scheme to determine a hole threshold value, constantly adjusts the size of this threshold value, and recessed measured by under present threshold value
Slot distance and actual range compare, and until the groove distance of measurement and the error of actual range are less than 1%, obtain threshold value；
S4, data enhancing: the resulting image of CT scan is imported into Avizo software and is rebuild, and FFT is passed through to image
Two kinds of filters of filter and Gaussian filter eliminate image noise, enhance picture quality；
S5, image cutting and binaryzation: by Avizo cutting tool, chosen area rejects the crack that portion disturbances generate；It will
The threshold application that threshold process obtains obtains the binary map of soil macropore in entire pedotheque；
S6, three-dimensional visualization: pass through the volume rendering module volume rendering and surface rendering module of Avizo software
Isosurface rendering realizes 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 software；And/or
S7.2, regard each independent soil macropore as an object by the way that auto skeleton module is available, analyze
The position of each object, angle, ligancy, volume, surface area, number of nodes, Node distribution, hydraulic radius, length, line segment number,
The total volume of soil macropore in end node points, branch node number and isolated node, and the entire sample of analysis, total length,
Total node number, total end node points, total score branch number of nodes, total isolated node, macrovoid quantity, average length, average hydraulic half
Diameter, total length；And/or
S7.3, the pore throat characteristic that soil macropore is calculated using pore network model Pores Network Model.
2. the method according to claim 1 based on CT scan technology quantization soil macropore spacial framework, special
Sign is: the pipe range of the pvc pipe one is 50cm, internal diameter 10cm.
3. the method according to claim 1 based on CT scan technology quantization soil macropore spacial framework, special
Sign is: the diameter of the pvc pipe two is 2cm.
4. the method according to claim 1 based on CT scan technology quantization soil macropore spacial framework, special
Sign is: in step S2 neutralization procedure S3, the parameter of CT scan equipment is voltage 140KV, electric current 200mA, sweep span
0.625mm。
5. the method according to claim 1 based on CT scan technology quantization soil macropore spacial framework, special
Sign is: in step S6, realizing while three-dimensional visualization and makes video.
6. the method according to claim 1 based on CT scan technology quantization soil macropore spacial framework, special
Sign is: in step S7.3, the pore throat characteristic of soil macropore includes the volume of pore throat, internal surface area, hydraulic radius.
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