CN106918717A - The method processed two phase flow flow field using captured image - Google Patents
The method processed two phase flow flow field using captured image Download PDFInfo
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- CN106918717A CN106918717A CN201710173380.2A CN201710173380A CN106918717A CN 106918717 A CN106918717 A CN 106918717A CN 201710173380 A CN201710173380 A CN 201710173380A CN 106918717 A CN106918717 A CN 106918717A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000005514 two-phase flow Effects 0.000 title claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 86
- 241001466460 Alveolata Species 0.000 claims abstract description 10
- 238000006073 displacement reaction Methods 0.000 claims abstract description 10
- 239000003792 electrolyte Substances 0.000 claims abstract description 4
- 239000008151 electrolyte solution Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 21
- 239000012530 fluid Substances 0.000 abstract description 4
- 238000000151 deposition Methods 0.000 abstract 1
- 230000011218 segmentation Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000003672 processing method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
- G01P5/20—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance using particles entrained by a fluid stream
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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
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/44—Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components
- G06V10/443—Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components by matching or filtering
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Abstract
The method processed two phase flow flow field using captured image of the invention, including：Trace particle is put into electrolyte, starts to be electrolysed and gather trace particle with bubble while depositing image in the electrolytic solution；Obtain comprising only the image of trace particle and obtain containing only alveolate image using Threshold segmentation；The all images that will be obtained carry out mesh generation with the pixels of 32 pixel * 32, the matching of similitude is carried out to each grid in the image of consecutive frame, find out the trace particle for matching in similar grid and similar grid in the image of consecutive frame, the time interval between displacement and two field pictures according to the trace particle that matches calculates fluid velocity flow field, the alveolate speed flowing field of institute in the image of consecutive frame is similarly obtained, trace particle and the simultaneous image of bubble are carried out into the above-mentioned speed flowing field for being calculated fluid and bubble two-phase.
Description
Technical field
The present invention relates to a kind of processing method in biphase gas and liquid flow flow field, particularly for a kind of using captured figure
Method as being processed two phase flow flow field.
Background technology
When carrying out electrolytic process in water, being electrolysed the bubble for producing can produce certain influence, research electricity to water body flow field
The bubble for producing is solved to the effect of water body flow, it is necessary to simultaneously after calculating water body flow field, bubble flow field and gas-liquid superposition
Flow field.
There is presently no the processing method for the biphase gas and liquid flow flow field being electrolysed in water.
The content of the invention
Present invention purpose is to provide a kind of side processed two phase flow flow field using captured image
Method, the method is measured first with trace particle to water body flow field, using trace particle（5 microns of sizes）With bubble（20
It is more than micron）Area difference in the picture, obtains comprising only trace particle and the image of bubble is calculated, finally by spike
Particle is calculated biphase gas and liquid flow as object simultaneously with bubble.
In order to complete present invention purpose, the application uses following technical scheme：
A kind of method processed two phase flow flow field using captured image of the invention, the method includes following step
Suddenly：
1）Trace particle is put into electrolyte, starts to be electrolysed and gather trace particle image in the electrolytic solution；
2）The pretreatment of minimum value background difference is carried out to acquired image, obtains removing the image of noise：
3）In step 2）Trace particle is found out in the image for obtaining, bubble is defined as above or equal to 2 times of areas of trace particle,
The pixel value of image shared by bubble is defined as 0, obtains comprising only the image of trace particle；
4）In step 2）All trace particles are found out in the image for obtaining, is defined as above or equal to 2 times of areas of trace particle
Bubble, 0 is defined as by the pixel value of image shared by all trace particles, is obtained containing only alveolate image；
5）By step 3）The all images for obtaining carry out mesh generation with the pixels of 32 pixel * 32, to the image of consecutive frame in it is every
Individual grid carries out the matching of similitude, finds out match one in the image of consecutive frame in similar grid and similar grid and shows
Track particle, the time interval between displacement and two field pictures according to the above-mentioned trace particle for matching calculates this and matches to be shown
Translational speed of the track particle in the grid is the flow velocity of liquid in the grid, repeat step 5）In obtaining the image of consecutive frame
The translational speed of trace particle in all grids, the liquid velocity flow field of as adjacent two field picture；
6）Repeat step 5）, obtain the trace particle speed flowing field of all images for comprising only trace particle；
7）By step 4）The all images for obtaining carry out mesh generation with the pixels of 32 pixel * 32, to the image of consecutive frame in it is every
Individual grid carries out the matching of similitude, finds out match a gas in similar grid and similar grid in the image of consecutive frame
Bubble, the time interval between displacement and two field pictures according to the above-mentioned bubble for matching calculates bubble that this matches at this
Translational speed in grid is the speed of bubble in the grid, repeat step 7）Obtain in the image of consecutive frame in all grids
The bubble velocity flow field of the image of the translational speed of bubble, as consecutive frame；
8）Repeat step 7）, obtain all bubble velocity flow fields containing only alveolate image；
9）By step 2）The simultaneous all images of trace particle and bubble for obtaining carry out grid and draw with the pixels of 32 pixel * 32
Point, the matching of similitude is carried out to each grid in the image of consecutive frame, find out similar grid and phase in the image of consecutive frame
Match trace particle or a bubble in like grid, according to the displacement of the above-mentioned trace particle or bubble for matching
Time interval between two field pictures calculates the translational speed of trace particle or bubble that this matches in the grid i.e.
It is the speed of liquid or bubble in the grid, repeat step 9）Obtain in the image of consecutive frame a spike grain in all grids
The speed flowing field of son or a translational speed for bubble, the as liquid of the image of consecutive frame and bubble two-phase；
10）Repeat step 9）, obtain the speed flowing field of all liq and bubble two-phase.
The method processed two phase flow flow field using captured image of the invention, wherein：Described step 2）
Comprise the following steps：
）Read the pixel value Bn of the every a line and each row in the first two field picture（I, j）,n=1-100；
b）Read the pixel value Bn+1 of the every a line and each row in next two field picture（I, j）, compare n-th frame image i rows j row
Pixel value Bn（I, j）The pixel value Bn+1 arranged with the (n+1)th two field picture i rows j（I, j）Size, if Bn（I, j）More than Bn+1（I,
j）, then Bn+1 is used（I, j）Replace Bn（I, j）Value；
c.）Repeat step b）, until reading all of image, resulting pixel value is constituted into an image, as background
Image G；
d.）By every a line and the pixel value Bn of each row in each original image（I, j）With the every a line in background image
With the pixel value G of each row（I, j）Subtract each other, the pixel value for obtaining forms the image of removal noise.
The method processed two phase flow flow field using captured image of the invention, wherein：The step 5）In
The matching of similitude be cross correlation grid most mutually high between trace particle in the image for first find out consecutive frame, then,
Corresponding trace particle is found out according to trace particle correlative relationship in grid.
The method processed two phase flow flow field using captured image of the invention, wherein：The step 7）In
The matching of similitude be cross correlation highest grid between bubble in the image for first find out consecutive frame, then, in similar net
Corresponding bubble is found out according to correlative relationship between bubble in lattice.
The method processed two phase flow flow field using captured image of the invention, wherein：The step 9）In
The matching of similitude be cross correlation highest grid between trace particle or bubble in the image for first find out consecutive frame, so
Afterwards, corresponding trace particle or bubble are found out according to correlative relationship between trace particle or bubble in similar grid.
The method processed two phase flow flow field using captured image of the invention, wherein：The trace particle
Diameter be 5 microns.
The method processed two phase flow flow field using captured image of the invention, wherein：The bubble it is straight
Footpath is 20 to 40 microns.
The method and existing processing method phase processed two phase flow flow field using captured image of the invention
Than can simultaneously calculate the two phase flow flow field after the superposition of water body flow field, bubble flow field and gas-liquid according to captured image pair.
Brief description of the drawings
Fig. 1 is a captured two field picture of the invention；
Fig. 2 is the next frame of Fig. 1 captured image of the invention；
Fig. 3 is background image G；
Fig. 4 is the image of Fig. 1 after removal noise；
Fig. 5 is the image of Fig. 2 after removal noise；
Fig. 6 is that Fig. 4 is divided into the image for comprising only trace particle；
Fig. 7 is that Fig. 4 is divided into containing only alveolate image；
Fig. 8 is that Fig. 5 is divided into the image for comprising only trace particle；
Fig. 9 is that Fig. 5 is divided into containing only alveolate image；
Figure 10 is that Fig. 6 is drawn as into the partial enlarged drawing after the grid of 32*32 pixels, for the sake of clarity, by trace particle blacking,
And other places are white；
Figure 11 is that Fig. 8 is drawn as into the partial enlarged drawing after the grid of 32*32 pixels, for the sake of clarity, by trace particle blacking,
And other places are white；
Figure 12 is the fluid field of the liquid obtained with Figure 10 and Figure 11；
Figure 13 is that Fig. 7 is drawn as into the partial enlarged drawing after the grid of 32*32 pixels, for the sake of clarity, by bubble blacking, and its
Its place is white,；
Figure 14 is that Fig. 9 is drawn as into the partial enlarged drawing after the grid of 32*32 pixels, for the sake of clarity, by bubble blacking, and its
Its place is white；
Figure 15 is the fluid field of the bubble obtained with Figure 13 and Figure 14；
Figure 16 is that Fig. 4 is drawn as into the partial enlarged drawing after the grid of 32*32 pixels, for the sake of clarity, by bubble blacking, and its
Its place is white,；
Figure 17 is that Fig. 5 is drawn as into the partial enlarged drawing after the grid of 32*32 pixels, for the sake of clarity, by bubble blacking, and its
Its place is white；
Figure 18 is the speed flowing field of the liquid and bubble two-phase obtained with Figure 16 and Figure 17.
Specific embodiment
A kind of method processed two phase flow flow field using captured image of the invention, wherein：Trace particle
Diameter be 5 microns, the diameter of bubble is 20 to 40 microns.
The method is comprised the following steps：
1）Trace particle is put into electrolyte, starts to be electrolysed and gather trace particle image in the electrolytic solution, such as Fig. 1 and Tu
Shown in 2；
2）The pretreatment of minimum value background difference is carried out to acquired image, obtains removing the image of noise, walked below the step
Suddenly：
）Read the pixel value Bn of the every a line and each row in the first two field picture（I, j）,n=1-100；
b）Read the pixel value Bn+1 of the every a line and each row in next two field picture（I, j）, compare n-th frame image i rows j row
Pixel value Bn（I, j）The pixel value Bn+1 arranged with the (n+1)th two field picture i rows j（I, j）Size, if Bn（I, j）More than Bn+1（I,
j）, then Bn+1 is used（I, j）Replace Bn（I, j）Value；
c.）Repeat step b）, until reading all of image, resulting pixel value is constituted into an image, as background
Image G, as shown in Figure 3；
d.）By every a line and the pixel value Bn of each row in each original image（I, j）With the every a line in background image
With the pixel value G of each row（I, j）Subtract each other, the pixel value for obtaining forms the image of removal noise, as shown in Figure 4 and Figure 5；
3）In step 2）Trace particle is found out in the image for obtaining, bubble is defined as above or equal to 2 times of areas of trace particle,
The pixel value of image shared by bubble is defined as 0, obtains comprising only the image of trace particle, such as Fig. 6 and Fig. 8；
4）In step 2）All trace particles are found out in the image for obtaining, is defined as above or equal to 2 times of areas of trace particle
Bubble, 0 is defined as by the pixel value of image shared by all trace particles, is obtained containing only alveolate image, such as Fig. 7 and Fig. 9；
5）The image local of Fig. 6 and Fig. 8 is amplified and obtains Figure 10 and Figure 11, by step 3）The all images for obtaining are with 32 pixel *
32 pixels carry out mesh generation, and the matching of similitude is carried out to each grid in the image of consecutive frame, and the matching of similitude is
Cross correlation grid most mutually high between trace particle is first found out in the image of consecutive frame, then, within a grid according to spike grain
Sub- correlative relationship finds out corresponding trace particle, between the displacement and two field pictures according to the above-mentioned trace particle for matching
Time interval calculate a trace particle that this matches liquid in the translational speed as grid in the grid
Flow velocity, repeat step 5）The translational speed of trace particle in all grids in the image of consecutive frame is obtained, as shown in figure 13, as
The speed flowing field of adjacent two field picture liquid；
6）Repeat step 5）, obtain the liquid velocity flow field of all images for comprising only trace particle；
7）The image local of Fig. 7 and Fig. 9 is amplified and is obtained as shown in Figure 14 and Figure 15, by step 4）The all images for obtaining are with 32
The pixels of pixel * 32 carry out mesh generation, carry out the matching of similitude to each grid in the image of consecutive frame, similitude
Be first find out consecutive frame image in cross correlation grid most mutually high between bubble, then, within a grid according to spike grain
Sub- correlative relationship finds out corresponding bubble, finds out match in the image of consecutive frame in similar grid and similar grid
Bubble, the time interval between displacement and two field pictures according to the above-mentioned bubble for matching calculate this match one
Translational speed of the individual bubble in the grid is the Grid Velocity, repeat step 7）Obtain all grids in the image of consecutive frame
The translational speed of middle bubble, as shown in figure 16, the as bubble velocity flow field of the image of consecutive frame；
8）Repeat step 7）, obtain all bubble velocity flow fields containing only alveolate image；
9）The image local of Fig. 4 and Fig. 5 is amplified and is obtained shown in Figure 16 and Figure 17, by step 2）The trace particle and bubble for obtaining
Simultaneous all images carry out mesh generation with the pixels of 32 pixel * 32, and each grid in the image of consecutive frame is carried out
The matching of similitude, the matching of similitude is cross correlation most phase between trace particle or bubble in the image for first find out consecutive frame
Grid high, then, finds out corresponding trace particle or bubble according to trace particle or bubble correlative relationship within a grid, according to
The above-mentioned trace particle for matching or the time interval between a displacement for bubble and two field pictures calculate the phase
The speed of a trace particle matching somebody with somebody or bubble liquid or bubble in the translational speed as grid in the grid, weight
Multiple step 9）A trace particle or a translational speed for bubble in all grids are obtained in the image of consecutive frame, such as Figure 18 institutes
Show, as the speed flowing field of the liquid of the image of consecutive frame and bubble two-phase；
10）Repeat step 9）, obtain the speed flowing field of all liq and bubble two-phase.
Above description is explanation of the invention, is not the restriction to inventing, and limited range of the present invention is referring to right
It is required that, in the case of without prejudice to spirit of the invention, the present invention can make any type of modification.
Claims (7)
1. a kind of method that image captured by is processed two phase flow flow field, the method is comprised the following steps：
1）Trace particle is put into electrolyte, starts to be electrolysed and gather trace particle image in the electrolytic solution；
The pretreatment of minimum value background difference is carried out to acquired image, obtains removing the image of noise：
In step 2）Trace particle is found out in the image for obtaining, bubble is defined as above or equal to 2 times of areas of trace particle, will
The pixel value of image shared by bubble is defined as 0, obtains comprising only the image of trace particle；
In step 2）All trace particles are found out in the image for obtaining, gas is defined as above or equal to 2 times of areas of trace particle
Bubble, 0 is defined as by the pixel value of image shared by all trace particles, is obtained containing only alveolate image；
By step 3）The all images for obtaining carry out mesh generation with the pixels of 32 pixel * 32, to each in the image of consecutive frame
Grid carries out the matching of similitude, finds out match spike in similar grid and similar grid in the image of consecutive frame
Particle, the time interval between displacement and two field pictures according to the above-mentioned trace particle for matching calculates the spike that matches
Translational speed of the particle in the grid is the flow velocity of liquid in the grid, repeat step 5）Obtain institute in the image of consecutive frame
There are the translational speed of trace particle in grid, the liquid velocity flow field of as adjacent two field picture；
Repeat step 5）, obtain the liquid velocity flow field of all images for comprising only trace particle；
By step 4）The all images for obtaining carry out mesh generation with the pixels of 32 pixel * 32, to each in the image of consecutive frame
Grid carries out the matching of similitude, finds out match a gas in similar grid and similar grid in the image of consecutive frame
Bubble, the time interval between displacement and two field pictures according to the above-mentioned bubble for matching calculates bubble that this matches at this
Translational speed in grid is the speed of bubble in the grid, repeat step 7）Obtain in the image of consecutive frame in all grids
The bubble velocity flow field of the image of the translational speed of bubble, as consecutive frame；
Repeat step 7）, obtain all bubble velocity flow fields containing only alveolate image；
By step 2）The simultaneous all images of trace particle and bubble for obtaining carry out grid and draw with the pixels of 32 pixel * 32
Point, the matching of similitude is carried out to each grid in the image of consecutive frame, find out similar grid and phase in the image of consecutive frame
Match trace particle or a bubble in like grid, according to the displacement of the above-mentioned trace particle or bubble for matching
Time interval between two field pictures calculates the translational speed of trace particle or bubble that this matches in the grid i.e.
It is liquid or the speed of bubble in the grid, repeat step 9）Obtain a spike in all grids in the image of consecutive frame
The speed flowing field of particle or a translational speed for bubble, the as liquid of the image of consecutive frame and bubble two-phase；
Repeat step 9）, obtain the speed flowing field of all liq and bubble two-phase.
2. the method for being processed two phase flow flow field using captured image according to claim 1, it is characterised in that：
Described step 2）Comprise the following steps：
）Read the pixel value Bn of the every a line and each row in the first two field picture（I, j）,n=1-100；
b）Read the pixel value Bn+1 of the every a line and each row in next two field picture（I, j）, compare n-th frame image i rows j row
Pixel value Bn（I, j）The pixel value Bn+1 arranged with the (n+1)th two field picture i rows j（I, j）Size, if Bn（I, j）More than Bn+1（I,
j）, then Bn+1 is used（I, j）Replace Bn（I, j）Value；
c）Repeat step b）, until reading all of image, resulting pixel value is constituted into an image, as Background
As G；
d）By every a line and the pixel value Bn of each row in each original image（I, j）With the every a line in background image and
The pixel value G of each row（I, j）Subtract each other, the pixel value for obtaining forms the image of removal noise.
3. the method that the image captured by according to claim 1 is processed two phase flow flow field, its feature exists
In：The step 5）In the matching of similitude be that cross correlation is most mutually high between trace particle in the image for first find out consecutive frame
Grid, then, corresponding trace particle is found out according to trace particle correlative relationship within a grid.
4. the method that the image captured by according to claim 1 is processed two phase flow flow field, its feature exists
In：The step 7）In the matching of similitude be cross correlation highest net between bubble in the image for first find out consecutive frame
Lattice, then, corresponding bubble are found out in similar grid according to correlative relationship between bubble.
5. the method that the image captured by according to claim 1 is processed two phase flow flow field, its feature exists
In：The step 9）In the matching of similitude be cross correlation between trace particle or bubble in the image for first find out consecutive frame
Highest grid, then, corresponding trace particle is found out in similar grid according to correlative relationship between trace particle or bubble
Or bubble.
6. the method that the image captured by according to claim 1 is processed two phase flow flow field, its feature exists
In：The diameter of the trace particle is 5 microns.
7. the method that the image captured by according to claim 1 is processed two phase flow flow field, its feature exists
In：The diameter of the bubble is 20 to 40 microns.
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| CN108332940A (en) * | 2018-02-09 | 2018-07-27 | 青岛科技大学 | A kind of two phase flow rises bubble fluid FLOW VISUALIZATION experimental method and experimental provision |
| CN108593958A (en) * | 2017-12-15 | 2018-09-28 | 北京航空航天大学 | The synchronous method and apparatus for obtaining gas-particle two-phase Velocity Field of Flow |
| CN109357979A (en) * | 2018-10-31 | 2019-02-19 | 国网湖南省电力有限公司 | A kind of haze movement analysis method and system based on satellite monitoring |
| CN114518213A (en) * | 2020-11-19 | 2022-05-20 | 成都晟甲科技有限公司 | Flow field measuring method, system and device based on skeleton line constraint and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109357979B (en) * | 2018-10-31 | 2021-05-18 | 国网湖南省电力有限公司 | Haze movement analysis method and system based on satellite monitoring |
| CN114518213A (en) * | 2020-11-19 | 2022-05-20 | 成都晟甲科技有限公司 | Flow field measuring method, system and device based on skeleton line constraint and storage medium |
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