CN206818745U - Broad surface flow field figure is as test system automatic calibration device - Google Patents
Broad surface flow field figure is as test system automatic calibration device Download PDFInfo
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- CN206818745U CN206818745U CN201720320694.6U CN201720320694U CN206818745U CN 206818745 U CN206818745 U CN 206818745U CN 201720320694 U CN201720320694 U CN 201720320694U CN 206818745 U CN206818745 U CN 206818745U
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Abstract
The utility model discloses a kind of broad surface flow field figure as test system automatic calibration device, including two groups of lasers and supporting rotating device, laser is spaced apart to be respectively arranged in rotating disk, and laser center is in same plane, regulation laser angle is completely superposed two beam laser, records rotating disk position and angle.Rotate two beam laser respectively, make two beam laser in video camera coverage intersect, camera acquisition intersection point image, then again rotary laser, collection intersection point image.Because the anglec of rotation and two groups of laser distances using trigonometric function, it is known that obtain laser crossing point coordinate, so as to calculate the actual range of two intersection points；The coordinate of laser crossing point in the picture is obtained through image procossing, the image distance of two intersection points is calculated, actual range is corresponding with image distance, you can completes system calibrating.The automatic conversion between image measurement system unit pixel and actual range is the method achieve, improves image speed measurement system accuracy.
Description
Technical field
Broad surface flow field figure be the utility model is related to as test system automatic calibration device, belong to flow velocity measurement neck
Domain.
Background technology
Broad surface flow field figure is widely used in laboratory river model or prototype river surface flow velocity as test system
Measurement.Its principle is：The good trace particle of trace performance is disseminated in water surface, water movement is followed, is remembered using CCD camera
The flow field figure picture of intervals is recorded, trace particle picture is extracted through image procossing, grain is carried out in adjacent two width flow field figure picture
Son matching, finds t1Moment trace particle is after the Δ t times in t2The image at moment, particle displacement L in the Δ t times is calculated,
It is the speed v of corresponding current point so as to try to achieve the speed of trace particle：V=L/ Δ t, displacement L unit is extracted from image
For pixel, to obtain actual flow velocity size, it is necessary to which relation between pixel and physical size will be established, the process is referred to as demarcating, a
=l/N, a are actual size corresponding to unit pixel, and l, N are respectively water surface physical length pixel corresponding with image
Number.
Fig. 1 is surface flow field image measurement system construction drawing, and when prototype river is applied, video camera can only be erected at seashore
On, to obtain the flow velocity at river center, video camera needs to be inclined at an angle arrangement, causes the image different zones of collection to be deposited
In different deformations.Therefore, there is an urgent need to the intersection that a kind of automatic calibration device, the utility model pass through two beam laser of tracking
Point, image pixel and physical size transformational relation are established with geometrical relationship, realizes automatic Calibration.
Utility model content
Purpose of utility model：In order to overcome the deficiencies in the prior art, the utility model provides one kind and is suitable to big model
The automatic calibration device of surface flow field image measurement system is enclosed, by following the trail of the crosspoint of two beam laser, is built with geometrical relationship
Vertical image pixel and physical size transformational relation, realize automatic Calibration.
Technical scheme：A kind of in order to solve the above technical problems, broad surface flow field image measurement system of the present utility model
System automatic calibration device, including the first rotary-tray, the second rotary-tray, first laser emitter and second laser transmitting dress
To put, the first laser emitter is located on the first rotary-tray, and second laser emitter is located on the second rotary-tray,
Video camera is installed on riverbank.
Preferably, first rotary-tray is located on the first crane, second rotary-tray is located at second liter
Drop on frame, the first crane and the second crane are installed on river bank, and decline extreme lower position is river lowest water level.
In the utility model, laser is spaced apart to be respectively arranged in rotating disk, and laser center is in same
One plane, regulation laser angle are completely superposed two beam laser, record rotating disk position and angle.Two beams are rotated respectively to swash
Light, two beam laser are made to intersect in video camera coverage, camera acquisition intersection point image, then rotary laser, collection again
Intersection point image.Because the anglec of rotation and two groups of laser distances using trigonometric function, it is known that obtain laser crossing point coordinate, so as to count
Calculate the actual range of two intersection points；The coordinate of laser crossing point in the picture is obtained through image procossing, two intersection points are calculated
Image distance, actual range is corresponding with image distance, you can completes system calibrating.The utility model is only with a video camera
With two laser beam emitting devices, structural system composition is simple, and scaling method is ingenious, low to the configuration requirement of system, significantly
The cost of device is saved, moreover, demarcation accuracy is high.
Beneficial effect：Broad surface flow field figure of the present utility model is as test system automatic calibration device, by by
One laser and the coincidence face of second laser adjustment are parallel with the water surface, by the intersection point of the beam laser of video camera real-time tracing two, use
Geometrical relationship establishes image pixel and physical size transformational relation, realizes automatic Calibration, then feeds back to the result of demarcation and takes the photograph
Camera, more accurately calculate flow velocity.
Brief description of the drawings
Fig. 1 is surface flow field image measurement system architecture.
Fig. 2 is the angle figure that first laser and second laser turn over.
Fig. 3 is schematic diagram calculation；
Fig. 4 is the schematic diagram of one embodiment.
Fig. 5 is system schematic of the present utility model.
Embodiment
As shown in figure 5, broad surface flow field figure of the present utility model is as test system automatic calibration device, including first
Rotary-tray 2, the second rotary-tray 5, first laser emitter 3 and second laser emitter 4, the first laser transmitting
Device 3 is located on the first rotary-tray 2, and second laser emitter 4 is located on the second rotary-tray 5, the first rotation support
Disk 2 is located on the first crane 1, and the second rotary-tray 5 is located on the second crane 6, and video camera 7 is provided with riverbank.
A kind of above-mentioned broad surface flow field figure comprises the following steps as the method for test system automatic calibration device：
(1) first laser and the second laser adjustment launched first laser emitter 3 and second laser emitter 4
To same plane；
(2) the first rotary-tray 2 and the second rotary-tray 5 are adjusted, overlaps first laser and second laser two-beam, the
The distance between one laser and second laser central point are A, using first laser center as origin, are with the second laser line of centres
X-axis, prototype coordinate system is established according to the right-hand rule, as shown in Figure 2；
The rotational angle of (3) first rotary-tray 2 is a11, the rotational angle of the second rotary-tray 5 is a21, video camera 7, which is shot, to swash
Light image M1, two beam laser crossing point P1 are (x in the coordinate that image coordinate is fastenedM1,yM1), the coordinate on prototype coordinate system is
(x1,y1), then have：
y1=A/ (cot a11+cot a21)
x1=y1cot a11；
(4) first rotary-trays 2 rotate a12, the second rotary-tray 5 rotation a22, as shown in figure 3, video camera 7 shoots laser
Image M2, two beam laser crossing point P2 are (x in the coordinate that image coordinate is fastenedM2,yM2), the coordinate on prototype coordinate system is (x2,
y2), then have：
y2=A/ (cot a12+cot a22)
x2=y2cot a12；
(5) actual range between P1 and P2 is：
(6) pixel distance between P1 and P2 on image is：
(7) relation then between unit pixel and physical size is：
A=l/N.
Embodiment 1
1) rotate the second rotary-tray 5 and rotate 90 °, as shown in figure 4, the rotational angle of the first rotary-tray 2 is a1, video camera
7 shooting laser image M1, coordinate of the two beam laser crossing points on image is (x1,y1), then have：
B1=A*tan a1；
2) rotational angle of the first rotary-tray 2 is a2, the shooting laser image M2 of video camera 7, two beam laser crossing points are in image
On coordinate be (x2,y2), then have：
B2=A*tan a2；
3) relation then between unit pixel and physical size is：
Described above is only preferred embodiment of the present utility model, it should be pointed out that：For the common skill of the art
For art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and
Retouching also should be regarded as the scope of protection of the utility model.
Claims (2)
1. broad surface flow field figure is as test system automatic calibration device, it is characterised in that：Including the first rotary-tray, second
Rotary-tray, first laser emitter and second laser emitter, the first laser emitter is positioned at the first rotation
On pallet, second laser emitter is located on the second rotary-tray, and video camera is provided with riverbank.
2. broad surface flow field figure according to claim 1 is as test system automatic calibration device, it is characterised in that：Institute
The first rotary-tray is stated to be located on the first crane, second rotary-tray is located on the second crane, the first crane and
Second crane is installed on river bank, and decline extreme lower position is river lowest water level.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720320694.6U CN206818745U (en) | 2017-03-30 | 2017-03-30 | Broad surface flow field figure is as test system automatic calibration device |
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| CN201720320694.6U CN206818745U (en) | 2017-03-30 | 2017-03-30 | Broad surface flow field figure is as test system automatic calibration device |
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| Publication Number | Publication Date |
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| CN206818745U true CN206818745U (en) | 2017-12-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950399A (en) * | 2017-03-30 | 2017-07-14 | 河海大学 | Broad surface flow field figure is as test system automatic calibration device and method |
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2017
- 2017-03-30 CN CN201720320694.6U patent/CN206818745U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950399A (en) * | 2017-03-30 | 2017-07-14 | 河海大学 | Broad surface flow field figure is as test system automatic calibration device and method |
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