CN205483805U - Video extensometer - Google Patents
Video extensometer Download PDFInfo
- Publication number
- CN205483805U CN205483805U CN201620026212.1U CN201620026212U CN205483805U CN 205483805 U CN205483805 U CN 205483805U CN 201620026212 U CN201620026212 U CN 201620026212U CN 205483805 U CN205483805 U CN 205483805U
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- China
- Prior art keywords
- clamping device
- video extensometer
- testing stand
- utility
- model
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a video extensometer, including a test benc, be provided with the clamping device of relative up -down motion on the test bench, clamping device links to each other with drive arrangement, clamping device includes clamping device and lower clamping device, go up upper end and lower extreme that clamping device and lower clamping device are used for the centre gripping test piece respectively, still be equipped with the baffle on the test bench, video extensometer still includes the image acquisition device, the image acquisition device links to each other with central processing unit, the image acquisition device sets up on last clamping device clamping device's under with central line.
Description
Technical field
This utility model relates to markings positioning field, particularly relates to a kind of Video Extensometer.
Background technology
Owing to traditional mechanical type extensometer is the most much limited, such as: in order to the damage preventing the edge of a knife is necessary
Taken off so whole process can not be measured before test specimen ruptures, be have impact on the precision of measurement；For softer papery
The weight of the material extensometers such as cloth self can cause the deformation of test specimen that measurement is brought error；For less material such as
Grain etc. can not clamp；And the material for moderate finite deformation amount can be beyond its measurement scope etc.；Video Extensometer then solves
These problems make the market more to carry out its demand greatly.
Although but the Video Extensometer of foreign study has reached higher level expensive, so being greatly facilitated domestic
The research of Video Extensometer, but level is the most on the low side.Owing to markings many employings toothpick of existing Video Extensometer is fixed on
Test specimen two ends, or use the method portraying " king " word or straight line etc.；And upper and lower markings are not carried out coarse positioning and make to search
The rope scope wide time is long；These factors all leverage speed and the precision of Video Extensometer.
Owing to fixture etc. can be collected when gathering image, markings identification is interfered, use mark to solve problems
Will line adds the method for coding, due to the anti-interference extremely strong time substantially reducing identification of coding；Markings are then innovated
Property ground the mark of special shape proposed, very big improve accuracy of identification.
Utility model content
In order to solve the shortcoming of prior art, this utility model provides a kind of Video Extensometer.
This utility model is by the following technical solutions:
A kind of Video Extensometer, including:
Testing stand, described testing stand is provided with the clamping device of upper and lower relative motion, and described clamping device is connected with driving means,
Described clamping device includes that clamping device and lower clamping device, described upper clamping device and lower clamping device are respectively used to clamping examination
The top and bottom of part, described testing stand is additionally provided with baffle plate；
Described Video Extensometer also includes that image collecting device, described image collecting device are connected with central processing unit；Described image
Harvester is arranged on the centrage of clamping device and lower clamping device.
Described central processing unit is also connected with display device.
The bottom of described testing stand is provided with universal wheel.
Described image collector is set to camera.
Described driving means is hydraulic cylinder or leading screw.
The beneficial effects of the utility model are:
The employing coding of this utility model Video Extensometer combines with mark, compared with the Video Extensometer only with mark, knows
Other precision is higher；And in conjunction with substantial amounts of experiment rehearsal, different test specimens there are is stronger adaptability；Due to coding capacity of resisting disturbance
By force, Video Extensometer of the present utility model quickly can carry out coarse positioning to markings, and uses Hough transformation to enter markings
Row detection, has high-precision remarkable advantage at high speed compared with existing Video Extensometer.
Accompanying drawing explanation
Fig. 1 is the structural representation of Video Extensometer of the present utility model；
Fig. 2 is markings localization method schematic flow sheet based on Video Extensometer of the present utility model.
Wherein, 1, testing stand；2, clamping device；3, baffle plate；4, test specimen；5, image collecting device；6, central authorities process
Device；7, display device.
Detailed description of the invention
With embodiment, this utility model is described further below in conjunction with the accompanying drawings:
As it is shown in figure 1, Video Extensometer of the present utility model, including:
Testing stand 1, described testing stand 1 is provided with the clamping device 2 of upper and lower relative motion, and described clamping device 2 fills with driving
Putting connected, described clamping device 2 includes that clamping device and lower clamping device, described upper clamping device and lower clamping device are respectively
For the top and bottom of clamping test pieces 4, described testing stand 1 is additionally provided with baffle plate 3；
Described Video Extensometer also includes that image collecting device 5, described image collecting device 5 are connected with central processing unit 6；Institute
State image collecting device 5 to be arranged on the centrage of clamping device and lower clamping device.
Upper clamping device and lower clamping device symmetrical configuration are arranged.
Wherein, driving means of the present utility model can be to be capable of screw mechanism or the cylinder mechanism of linear motion.
Image collecting device 5 may select camera or video camera；Central processing unit 6 can use single-chip microcomputer or arm processor.
This utility model uses the purpose of baffle plate 3 to be in order to avoid other objects enter camera fields of view, affects the identification of test specimen.
Further, image collecting device 5 of the present utility model is camera, it would however also be possible to employ other image collecting devices carry out figure
As gathering.Wherein, image collecting device 5 is arranged on the centrage of clamping device and lower clamping device.
In the present embodiment, central processing unit 6 is also connected with display device 7.Wherein, display device 7 is LCD liquid crystal display screen
Or LED display.Further, the bottom of testing stand 1 is provided with universal wheel, it is simple to moving freely of testing stand.
As in figure 2 it is shown, markings localization method based on Video Extensometer of the present utility model, including:
Step (1): test specimen upper end to be tensioned for Video Extensometer is set gradually the first coding region and the first logo area, under test specimen
End sets gradually the second coding region and the second logo area；Pre-arranged code image is all pasted in first coding region and the second coding region, the
Default sign image all it is pasted with in one logo area and the second logo area；
Step (2): comprise the first coding region, the first logo area, the second coding region and second of image acquisition device are marked
The test specimen image in will district is sent to central processing unit, according to the geometric properties of pre-arranged code image, searches for and obtain the first coding region
And second width of coding region；
Step (3): according to default first logo area and the first coding region wide association and the second logo area and the second coding region width
Degree relation, determines the first logo area and the scope of the second logo area in test specimen image respectively；Respectively at the first logo area and the second mark
Extract in the range of will district and preset sign image, and it is pre-to use Hall husband conversion to be determined in the first logo area and the second logo area
If the position of the markings corresponding to sign image.
Further, the pre-arranged code image in step (1) is bar code.
Wherein, pre-arranged code image can also use circle codification, default sign image can also select straight line.
Further, the default sign image in step (1) is del, and markings are parallel with described three shape bases, institute
The summit stating down three shapes is arranged on markings.
Wherein, the base of del is the most parallel with the lines in bar code.
Further, step (3) determines the process of the position of markings in the first logo area and the second logo area, including:
Extract three sidelines of del in the first logo area and the second logo area respectively, and to three limits of del extracted
Carry out Hall husband's conversion respectively, and determine, according to Hall husband conversion, the del being made up of this three line segments, obtain inverted triangle
The summit of shape, and then obtain the position of markings in the first logo area and the second logo area.
By three straightway L1、L2、L3Intersect the del of composition, in mark region, extract three sides of a triangle line also
It is carried out Hall husband and converts Hij, and according to HijExtract L1、L2、L3And determine by these three line segments form fall three
Dihedral, the summit P that i.e. can get del is upper index point position, and the straight line at markings namely this index point place is
The straight line parallel with del base.
Although detailed description of the invention of the present utility model is described by the above-mentioned accompanying drawing that combines, but not this utility model is protected
The restriction of scope, one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model, art technology
Personnel need not to pay various amendments or deformation that creative work can make still within protection domain of the present utility model.
Claims (3)
1. a Video Extensometer, it is characterised in that including:
Testing stand, the clamping device of upper and lower relative motion it is provided with on described testing stand, described clamping device is connected with driving means, described clamping device includes clamping device and lower clamping device, described upper clamping device and lower clamping device are respectively used to the top and bottom of clamping test pieces, and described testing stand is additionally provided with baffle plate；
Described Video Extensometer also includes that image collecting device, described image collecting device are connected with central processing unit；Described image collecting device is arranged on the centrage of clamping device and lower clamping device；
Described central processing unit is also connected with display device；
The bottom of described testing stand is provided with universal wheel.
2. Video Extensometer as claimed in claim 1, it is characterised in that described image collector is set to camera.
3. Video Extensometer as claimed in claim 1, it is characterised in that described driving means is hydraulic cylinder or leading screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620026212.1U CN205483805U (en) | 2016-01-12 | 2016-01-12 | Video extensometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620026212.1U CN205483805U (en) | 2016-01-12 | 2016-01-12 | Video extensometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205483805U true CN205483805U (en) | 2016-08-17 |
Family
ID=56667191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620026212.1U Expired - Fee Related CN205483805U (en) | 2016-01-12 | 2016-01-12 | Video extensometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205483805U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510125A (en) * | 2016-01-12 | 2016-04-20 | 济南大学 | Video extensometer and marker line positioning method based on video extensometer |
| CN112683188A (en) * | 2020-12-01 | 2021-04-20 | 上海华龙测试仪器有限公司 | Full-automatic video extensometer |
-
2016
- 2016-01-12 CN CN201620026212.1U patent/CN205483805U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510125A (en) * | 2016-01-12 | 2016-04-20 | 济南大学 | Video extensometer and marker line positioning method based on video extensometer |
| CN112683188A (en) * | 2020-12-01 | 2021-04-20 | 上海华龙测试仪器有限公司 | Full-automatic video extensometer |
| CN112683188B (en) * | 2020-12-01 | 2023-12-29 | 上海华龙测试仪器有限公司 | Full-automatic video extensometer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20170112 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |