CN103558409B - Distributed PTV flow field survey system and measuring method thereof in a kind of current - Google Patents
Distributed PTV flow field survey system and measuring method thereof in a kind of current Download PDFInfo
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- CN103558409B CN103558409B CN201310508494.XA CN201310508494A CN103558409B CN 103558409 B CN103558409 B CN 103558409B CN 201310508494 A CN201310508494 A CN 201310508494A CN 103558409 B CN103558409 B CN 103558409B
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Abstract
The invention discloses distributed PTV flow field survey system in a kind of current, comprise river model, trace particle, one group of smart camera, one group of POE switch, wireless router and Flow Field Calculation system; Described trace particle is evenly distributed in the current of river model, described smart camera is arranged on above the water surface of river model, described smart camera is connected with POE switch, described POE switch is connected with wireless router, described wireless router and wireless network card UNICOM, Flow Field Calculation system is connected with wireless network card.Present invention also offers distributed PTV flow field speed-measuring method in the current based on wireless measurement.The present invention is embedded into smart camera by employing algorithm and processes, and improves measuring speed, directly exports measurement data, overcome output image data in prior art, data volume is large, cannot realize wireless measurement, and due to processing speed low, cannot the technical matters of transient measurement.
Description
Technical field
The present invention relates to distributed PTV flow field survey system and measuring method thereof in a kind of current, be specifically related to distributed image velocity-measuring system and the measuring method thereof of surface flow field in a kind of current, belong to Hydraulics and River Dynamics technical field.
Background technology
Water flow structure is the core content of Hydraulics and River Dynamics, model test is the important means of carrying out current research, and fluid-velocity survey technology is the basis obtaining water flow structure data, the research carrying out model test flow field measuring technique is very necessary and urgent to raising water flow mud-sand research level, can be the technical support that hydraulic engineering construction, flood control, shipping, waste water ecological control and reparation, water prevention and cure of pollution and water environment improvement etc. provide advanced.
At present in pattern of water flow experimental study, widespread use be that particle picture follows the tracks of velocity measuring technique (PTV, ParticleTrackingVelocimetry), be mainly used in the measurement in river work and harbor model transient surface flow field on a large scale.But current PTV flow field survey system many employings common simulation camera, needs to carry out multichannel image collection by video line and image pick-up card, when measurement range is larger, usually needs to arrange dozens of even up to a hundred cameras, connect up very complicated loaded down with trivial details.In addition, computing machine need carry out circular treatment to the image of multiple camera, and whole audience splicing is carried out in the flow field calculating each camera shooting area then, just can obtain whole flow field.The difficult problem urgent needs such as when camera quantity is more, image processing time can be long, and what be just difficult to guarantee measurement is instantaneous flow field, and wiring is complicated, image processing time is long are resolved, and seriously constrain the raising of current research level.
Current employing wired measuring mode, connects up more complicated, adds installation difficulty, and in addition, the port number supported due to every platform collecting image of computer card is limited, when camera quantity is too many, needs multiple stage computing machine, inconvenient operation.And due to line too many, often there will be signal disturbing, affect image quality.
In sum, model test flow field measuring technique is the gordian technique of current research, in order to overcome the insoluble difficult problem of current PTV flow field velocity measuring technique, be badly in need of a kind of device or system that can realize wireless measurement, meet the particle image velocimetry that instantaneity requires of research and development, improve flow field survey technical merit further.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the first object of the present invention is to provide a kind of distributed PTV flow field transient measurement system.
Another object of the present invention is to provide a kind of distributed PTV flow field transient measurement method.
Technical scheme: for solving the problems of the technologies described above, distributed PTV flow field survey system in a kind of current provided by the invention, comprises river model, trace particle, one group of smart camera, one group of POE switch, wireless router and Flow Field Calculation system; Described trace particle is evenly distributed in the current of river model, described smart camera is arranged on above the water surface of river model, described smart camera is connected with POE switch, described POE switch is connected with wireless router, described wireless router and wireless network card UNICOM, Flow Field Calculation system is connected with wireless network card; Described smart camera inside is provided with image processing module.
Preferably, described image processing module comprises: image capture module, the Threshold segmentation module be connected with image capture module, the zone marker module be connected with Threshold segmentation module, the blob extraction module be connected with zone marker module, the particle coordinate module be connected with blob extraction module.
Preferably, described Flow Field Calculation system comprises: computer and calculating analysis software, the Flow visualisation module that described calculating analysis software comprises particle matching module, the coordinate transferring be connected with particle matching module, the flow velocity extraction module be connected with coordinate transferring, the flow field concatenation module be connected with flow velocity extraction module and is connected with flow field concatenation module.
Preferably, described each POE switch is connected with several smart cameras respectively, and wireless router is connected with each POE switch respectively.
Preferably, described trace particle oval in shape, the long axis width of described trace particle is 2 ~ 4 times of trace particle short axis width.
Preferably, described trace particle is divided into white, and described trace particle adopts PP material and the plaster of paris to modulate and forms, and the density of trace particle, close to the density of water, floats on water surface.
A kind of distributed PTV flow field transient measurement method, described measuring process is as follows:
A) in current, evenly dispense colored trace particle and swim in water surface;
B) with several smart cameras shooting trace particle moving image and in establish pass through image processing program, automatic extraction particle coordinate, described image processing program comprises the steps: to gather image information by image capture module, then carrying out image threshold segmentation is carried out, by zone marker module, zone marker is carried out to trace particle, then the trace particle carrying out zone marker is carried out particle coordinate extraction;
C) POE switch is connected with several smart cameras, and outputs to the Flow Field Calculation system of computing machine by the particle coordinate data that smart camera exports by wireless router;
D) Flow Field Calculation system adopts particle matching algorithm to calculate surface flow field, comprises the following steps:
1) the shortest method of Particles Moving distance is adopted to mate the particle in two continuous frames image, for each trace particle in the 1st two field picture, setting search radius in the second two field picture, the conduct coupling particle that distance is the shortest with it in hunting zone;
2) by demarcating, image coordinate being scaled actual coordinate, Particles Moving distance is obtained flow velocity divided by the time: V=△ d/ △ t;
3) two obvious unique points are set in each smart camera coverage, by matching characteristic point, carry out translation and rotational transform, complete the splicing of whole flow field.
4) coordinate of each particle and flow velocity are carried out whole audience display.
Beneficial effect: in terms of existing technologies, structure is simple, is easy to build, is conducive to promoting the use of for colour particles image speed measurement system provided by the invention; By employing, algorithm is embedded into smart camera and carries out distributed image process and wireless measurement, solve and adopt the camera mode that be connected wired with capture card, wiring is complicated, and computing time is long, is difficult to the requirement meeting temporal synchronization measurement.The present invention improves measuring speed by establishing program and wireless measurement in smart camera, directly exports measurement data, realizes transient measurement, ensure that the real-time accuracy of data.
The distributed PTV flow field measurement method of one of the present invention, can significantly improve flow field survey accuracy rate and efficiency, thus promotes that current research level promotes, for able to resisting flood and drought, protection water environment etc. provide technical support.
Accompanying drawing explanation
Fig. 1 is distributed PTV flow field survey system schematic of the present invention.
Fig. 2 is Flow visualisation schematic diagram.
Fig. 3 is image processing module schematic diagram in smart camera in the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, distributed PTV flow field survey system in a kind of current, comprises river model 1, trace particle 2, one group of smart camera 3, one group of POE switch 4, wireless router 5, wireless network card 7 and Flow Field Calculation system 8; Described trace particle 2 is evenly distributed in the current of river model 1, described smart camera 3 is arranged on above the water surface of river model 1, described smart camera 3 is connected with POE switch 4, described POE switch 4 is connected with wireless router 5, described wireless router 5 and wireless network card 7 UNICOM, Flow Field Calculation system 8 is connected with wireless network card 7; Described smart camera 3 inside is provided with image processing module, described image processing module comprises: image capture module, the Threshold segmentation module be connected with image capture module, the zone marker module be connected with Threshold segmentation module, the blob extraction module be connected with zone marker module, the particle coordinate module be connected with blob extraction module.
Described Flow Field Calculation system 8 comprises: computer and calculating analysis software, the Flow visualisation module that described calculating analysis software comprises particle matching module, the coordinate transferring be connected with particle matching module, the flow velocity extraction module be connected with coordinate transferring, the flow field concatenation module be connected with flow velocity extraction module and is connected with flow field concatenation module; Described each POE switch 4 is connected with several smart cameras 3 respectively, and wireless router 5 is connected with each POE switch 4 respectively; Described trace particle 2 oval in shape, the long axis width of described trace particle 2 is 2 ~ 4 times of trace particle short axis width; Described trace particle 2 is divided into white, and described trace particle 2 adopts PP material and the plaster of paris to modulate and forms, and the density of trace particle 2, close to the density of water, floats on water surface.
River model 1 is the solid model reduced according to certain guide according to natural river, is in the key issues such as river seashore midchannel regulation, river improvement, in order to a kind of important research means of simulating riverway water flow sediment movement and river bed change situation.
The trace particle adopted in the present embodiment, in elliptic flow wire shaped, the long axis width of trace particle is 2 ~ 4 times of trace particle 2 minor axis height, is preferably 3 times that long axis width is minor axis height.Color is white, and this trace particle adopts PP material and the plaster of paris to modulate and forms, and close with jet density, float on water surface, followability is good, not easily stranded, not easily assembles.
Smart camera 3 adopts Cognex In-SightMicro, and this smart camera contains multiple vision aid storehouse, comprises image acquisition tool storage room, spot extracting tool storehouse etc.Perpendicular to entity river model 1 water surface, gather the moving image of trace particle 2, and automatically extract particle coordinate data.Particle coordinate data are wirelessly transmitted to Flow Field Calculation system by wireless router, this system comprises particle matching module, coordinate transferring, flow velocity extraction module, flow field concatenation module and Flow visualisation module, the particle coordinate data that calculating analysis software Real-time Collection smart camera exports, show flow field after carrying out computational analysis.
A kind of distributed PTV flow field transient measurement method, described measuring process is as follows:
A) in current, evenly dispense colored trace particle and swim in water surface;
B) with several smart cameras shooting trace particle moving image and in establish pass through image processing program, automatic extraction particle coordinate, described image processing program as shown in Figure 3, comprise the steps: to gather image information by image capture module, then carrying out image threshold segmentation is carried out, by zone marker module, zone marker is carried out to trace particle, then the trace particle carrying out zone marker is carried out particle coordinate extraction;
C) POE switch is connected with several smart cameras, and outputs to the Flow Field Calculation system of computing machine by the particle coordinate data that smart camera exports by wireless router;
D) Flow Field Calculation system adopts particle matching algorithm to calculate surface flow field, comprises the following steps:
1) the shortest method of Particles Moving distance is adopted to mate the particle in two continuous frames image, for each trace particle in the 1st two field picture, setting search radius in the second two field picture, the conduct coupling particle that distance is the shortest with it in hunting zone;
2) by demarcating, image coordinate being scaled actual coordinate, Particles Moving distance is obtained flow velocity divided by the time: V=△ d/ △ t;
3) two obvious unique points are set in each smart camera coverage, by matching characteristic point, carry out translation and rotational transform, complete the splicing of whole flow field.
4) coordinate of each particle and flow velocity are carried out whole audience display.
Figure 2 shows that Flow visualisation figure, velocity vector 9 is mark flow rate scale, size and direction.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a distributed PTV flow field survey system in current, is characterized in that: comprise river model (1), trace particle (2), one group of smart camera (3), one group of POE switch (4), wireless router (5), wireless network card (7) and Flow Field Calculation system (8), described trace particle (2) is evenly distributed in the current of river model (1), described smart camera (3) is arranged on above the water surface of river model (1), described smart camera (3) is connected with POE switch (4), described POE switch (4) is connected with wireless router (5), described wireless router (5) and wireless network card (7) UNICOM, Flow Field Calculation system (8) is connected with wireless network card (7), described smart camera (3) inside is provided with image processing module, described image processing module comprises: image capture module, the Threshold segmentation module be connected with image capture module, the zone marker module be connected with Threshold segmentation module, the blob extraction module be connected with zone marker module, the particle coordinate module be connected with blob extraction module, described Flow Field Calculation system (8) comprising: computer and calculating analysis software, described calculating analysis software comprises particle matching module, the coordinate transferring be connected with particle matching module, the flow velocity extraction module be connected with coordinate transferring, the flow field concatenation module be connected with flow velocity extraction module and the Flow visualisation module be connected with flow field concatenation module.
2. distributed PTV flow field survey system in a kind of current according to claim 1, it is characterized in that: each POE switch (4) is connected with several smart cameras (3) respectively, wireless router (5) is connected with each POE switch (4) respectively.
3. distributed PTV flow field survey system in a kind of current according to claim 1, it is characterized in that: described trace particle (2) oval in shape, the long axis width of described trace particle (2) is 2 ~ 4 times of trace particle short axis width.
4. distributed PTV flow field survey system in a kind of current according to claim 3, it is characterized in that: described trace particle (2) is white, described trace particle (2) adopts PP material and the plaster of paris to modulate and forms, the density of trace particle (2), close to the density of water, floats on water surface.
5. a distributed PTV flow field transient measurement method, is characterized in that: described measuring process is as follows:
A) in current, evenly dispense colored trace particle and swim in water surface;
B) with several smart cameras shooting trace particle moving image and in establish pass through image processing program, automatic extraction particle coordinate, described image processing program comprises the steps: to gather image information by image capture module, then carrying out image threshold segmentation is carried out, by zone marker module, zone marker is carried out to trace particle, then the trace particle carrying out zone marker is carried out particle coordinate extraction;
C) POE switch is connected with several smart cameras, and outputs to the Flow Field Calculation system of computing machine by the particle coordinate data that smart camera exports by wireless router;
D) Flow Field Calculation system adopts particle matching algorithm to calculate surface flow field, comprises the following steps:
1) the shortest method of Particles Moving distance is adopted to mate the particle in two continuous frames image, for each trace particle in the 1st two field picture, setting search radius in the second two field picture, the conduct coupling particle that distance is the shortest with it in hunting zone;
2) by demarcating, image coordinate being scaled actual coordinate, Particles Moving distance is obtained flow velocity divided by the time: V=△ d/ △ t;
3) two obvious unique points are set in each smart camera coverage, by matching characteristic point, carry out translation and rotational transform, complete the splicing of whole flow field;
4) coordinate of each particle and flow velocity are carried out whole audience display.
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