CN105510125B - A kind of Video Extensometer and the markings localization method based on Video Extensometer - Google Patents
A kind of Video Extensometer and the markings localization method based on Video Extensometer Download PDFInfo
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- CN105510125B CN105510125B CN201610018039.5A CN201610018039A CN105510125B CN 105510125 B CN105510125 B CN 105510125B CN 201610018039 A CN201610018039 A CN 201610018039A CN 105510125 B CN105510125 B CN 105510125B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
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Abstract
The invention discloses a kind of Video Extensometer and the markings localization method based on Video Extensometer, the method comprising the steps of (1)：Video Extensometer test specimen upper end to be tensioned is set gradually into the first code area and the first logo area, test specimen lower end sets gradually second code area and the second logo area；Pre-arranged code image is pasted in first code area and second code area, default sign image is pasted with the first logo area and the second logo area；Step (2)：The test specimen image comprising the first code area, the first logo area, second code area and the second logo area of image acquisition device is sent to central processing unit, according to the geometric properties of pre-arranged code image, search for and obtain the width of the first code area and second code area；Step (3)：Default sign image is extracted in the range of the first logo area and the second logo area respectively, and the position that the markings corresponding to sign image are preset in the first logo area and the second logo area is determined using Hall husband conversion.
Description
Technical field
The present invention relates to markings positioning field, more particularly to a kind of Video Extensometer and the mark based on Video Extensometer
Line localization method.
Background technology
Because traditional mechanical extensometer is much limited in actual use, such as：In order to prevent the damage of the edge of a knife
It is bad to be removed before test specimen fracture so can not be measured to whole process, it have impact on the precision of measurement；For compared with
The weight of the material such as soft papery cloth extensometer itself can cause the deformation of test specimen to bring error to measurement；For less
Material can not be clamped such as particle；And its measurement range etc. can be exceeded for the material of moderate finite deformation amount；And video
Extensometer then solves these problems and make it that market is more next to its demand big.
Although the Video Extensometer of foreign study has reached higher horizontal but expensive, so being greatly facilitated
The research of internal video extensometer, but it is horizontal universal relatively low.Because the markings of existing Video Extensometer use tooth more
Label are fixed on test specimen two ends, or using the method for portraying " king " word or straight line etc.；And upper and lower markings are not carried out thick
Positioning causes the wide time length in hunting zone；These factors all leverage the speed and precision of Video Extensometer.
Markings identification is interfered due to fixture etc. can be collected when gathering image, adopted to solve problems
The method encoded is added with to markings, due to the anti-interference of the coding extremely strong time for substantially reducing identification；For mark
Line then innovatively proposes the mark of special shape, very big to improve accuracy of identification.
The content of the invention
In order to solve the shortcomings that prior art, the present invention provides a kind of Video Extensometer and the mark based on Video Extensometer
Line localization method.This method carries out coarse positioning using pre-arranged code image is obtained to markings, using Hough transformation come to mark
Line is accurately detected.
To achieve the above object, the present invention uses following technical scheme：
A kind of Video Extensometer, including：
Testing stand, the clamping device of upper and lower relative motion is provided with the testing stand, and the clamping device fills with driving
Put connected, the clamping device includes upper clamping device and lower clamping device, the upper clamping device and lower clamping device difference
For the top and bottom of clamping test pieces, baffle plate is additionally provided with the testing stand；
The Video Extensometer also includes image collecting device, and described image harvester is connected with central processing unit；Institute
Image collecting device is stated to be arranged on the center line of clamping device and lower clamping device.
The central processing unit is also connected with display device.
The bottom of the testing stand is provided with universal wheel.
Described image harvester is camera.
The drive device is hydraulic cylinder or leading screw.
A kind of markings localization method based on Video Extensometer, including：
Step (1)：Video Extensometer test specimen upper end to be tensioned is set gradually into the first code area and the first logo area, tried
Part lower end sets gradually second code area and the second logo area；Pre-arranged code figure is pasted in first code area and second code area
Default sign image is pasted with picture, the first logo area and the second logo area；
Step (2)：Image acquisition device is included into the first code area, first logo area, second code area and the
The test specimen image of two logo areas is sent to central processing unit, according to the geometric properties of pre-arranged code image, searches for and obtains first
Code area and the width of second code area；
Step (3)：Compiled according to default first logo area and the first code area wide association and the second logo area with second
Code sector width relation, determines the scope of the first logo area and the second logo area in test specimen image respectively；Respectively in the first logo area
Sign image is preset with being extracted in the range of the second logo area, and the first logo area and second are determined using Hall husband conversion
The position of the markings corresponding to sign image is preset in logo area.
Pre-arranged code image in the step (1) is bar code.
Default sign image in the step (1) is del, and markings are parallel with the three shape bases, described
The summit of three shapes is arranged on markings.
The base of the del is parallel with the lines in bar code.
The process of the first logo area and the position of the markings in the second logo area is determined in the step (3), including：
Three sidelines of del in the first logo area and the second logo area are extracted respectively, and to the del of extraction
Three sides carry out Hall husband's conversion, and the del for determining to be made up of three line segments according to Hall husband conversion respectively, obtain
To the summit of del, and then obtain the position of markings in the first logo area and the second logo area.
Beneficial effects of the present invention are：
(1) Video Extensometer that the present invention is combined using coding with mark, with the Video Extensometer phase only with mark
Than accuracy of identification is higher；And with reference to substantial amounts of experiment rehearsal, there is stronger adaptability to different test specimens；
(2) due to coding strong antijamming capability, the system can quickly carry out coarse positioning to markings, and be become using Hough
Bring and markings are detected, there is high-precision remarkable advantage at high speed compared with existing Video Extensometer.
Brief description of the drawings
Fig. 1 is the structural representation of the Video Extensometer of the present invention；
Fig. 2 is the markings localization method schematic flow sheet based on Video Extensometer of the present invention.
Wherein, 1, testing stand；2nd, clamping device；3rd, baffle plate；4th, test specimen；5th, image collecting device；6th, central processing unit；7、
Display device.
Embodiment
The present invention will be further described with embodiment below in conjunction with the accompanying drawings：
As shown in figure 1, the Video Extensometer of the present invention, including：
Testing stand 1, the clamping device 2 of upper and lower relative motion is provided with the testing stand 1, the clamping device 2 is with driving
Dynamic device is connected, and the clamping device 2 includes upper clamping device and lower clamping device, the upper clamping device and lower clamping device
It is respectively used to the top and bottom of clamping test pieces 4, baffle plate 3 is additionally provided with the testing stand 1；
The Video Extensometer also includes image collecting device 5, and described image harvester 5 is connected with central processing unit 6；
Described image harvester 5 is arranged on the center line of clamping device and lower clamping device.
Upper clamping device and lower clamping device symmetrical configuration are set.
Wherein, inventive drive means can be the screw mechanism or cylinder mechanism that can realize linear motion.
The present invention is in order to avoid other objects enter camera fields of view using the purpose of baffle plate 3, influences the identification of test specimen.
Further, image collecting device 5 of the invention is camera, can also carry out figure using other image collecting devices
As collection.Wherein, image collecting device 5 is arranged on the center line 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, is easy to moving freely for testing stand.
As shown in Fig. 2 the markings localization method based on Video Extensometer of the present invention, including：
Step (1)：Video Extensometer test specimen upper end to be tensioned is set gradually into the first code area and the first logo area, tried
Part lower end sets gradually second code area and the second logo area；Pre-arranged code figure is pasted in first code area and second code area
Default sign image is pasted with picture, the first logo area and the second logo area；
Step (2)：Image acquisition device is included into the first code area, first logo area, second code area and the
The test specimen image of two logo areas is sent to central processing unit, according to the geometric properties of pre-arranged code image, searches for and obtains first
Code area and the width of second code area；
Step (3)：Compiled according to default first logo area and the first code area wide association and the second logo area with second
Code sector width relation, determines the scope of the first logo area and the second logo area in test specimen image respectively；Respectively in the first logo area
Sign image is preset with being extracted in the range of the second logo area, and the first logo area and second are determined using Hall husband conversion
The position of the markings corresponding to sign image is preset in logo area.
Further, the pre-arranged code image in step (1) is bar code.
Wherein, pre-arranged code image can also use circle codification, and default sign image can also select straight line.
Further, the default sign image in step (1) is del, and markings are put down with the three shape bases
OK, the summit of three shapes is arranged on markings.
Wherein, the base of del is parallel with the lines in bar code.
Further, the process of the first logo area and the position of the markings in the second logo area, bag are determined in step (3)
Include：
Three sidelines of del in the first logo area and the second logo area are extracted respectively, and to the del of extraction
Three sides carry out Hall husband's conversion, and the del for determining to be made up of three line segments according to Hall husband conversion respectively, obtain
To the summit of del, and then obtain the position of markings in the first logo area and the second logo area.
By three straightway L1、L2、L3The del of intersecting composition, extracts three sides of a triangle in mark region
Line simultaneously carries out Hall husband conversion H to itij, and according to HijTo extract L1、L2、L3And determine to be fallen by what three line segments formed
Triangle, you can the summit P for obtaining del is upper index point position, straight line of the markings namely where the index point,
It is the straight line parallel with del base.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (6)
- A kind of 1. Video Extensometer, it is characterised in that including：Testing stand, the clamping device of upper and lower relative motion, the clamping device and drive device phase are provided with the testing stand Even, the clamping device includes upper clamping device and lower clamping device, and the upper clamping device and lower clamping device are respectively used to The top and bottom of clamping test pieces, baffle plate is additionally provided with the testing stand；The Video Extensometer also includes image collecting device, and described image harvester is connected with central processing unit；The figure It is arranged at as harvester on the center line of upper clamping device and lower clamping device；During the markings positioning based on Video Extensometer, Video Extensometer test specimen upper end to be tensioned is set gradually First code area and the first logo area, test specimen lower end set gradually second code area and the second logo area；First code area and Pre-arranged code image is pasted in two code areas, default sign image is pasted with the first logo area and the second logo area；Will The test specimen image for including the first code area, the first logo area, second code area and the second logo area of image acquisition device Central processing unit is sent to, according to the geometric properties of pre-arranged code image, searches for and obtains the first code area and second code area Width；Closed according to default first logo area and the first code area wide association and the second logo area with second code area width System, the scope of the first logo area and the second logo area in test specimen image is determined respectively；Indicate respectively in the first logo area and second Default sign image is extracted in the range of area, and is determined using Hall husband conversion in the first logo area and the second logo area in advance If the position of the markings corresponding to sign image.
- 2. Video Extensometer as claimed in claim 1, it is characterised in that the central processing unit is also connected with display device.
- 3. Video Extensometer as claimed in claim 1, it is characterised in that the bottom of the testing stand is provided with universal wheel.
- 4. Video Extensometer as claimed in claim 1, it is characterised in that described image harvester is camera.
- 5. Video Extensometer as claimed in claim 1, it is characterised in that the drive device is hydraulic cylinder or leading screw.
- A kind of 6. markings localization method of the Video Extensometer based on as described in claim 1-5 is any, it is characterised in that bag Include：Step（1）：Video Extensometer test specimen upper end to be tensioned is set gradually into the first code area and the first logo area, under test specimen End sets gradually second code area and the second logo area；Pre-arranged code image is pasted in first code area and second code area, Default sign image is pasted with first logo area and the second logo area；Step（2）：Image acquisition device is included into the first code area, the first logo area, second code area and the second mark The test specimen image in will area is sent to central processing unit, according to the geometric properties of pre-arranged code image, searches for and obtains the first coding Area and the width of second code area；Step（3）：According to default first logo area and the first code area wide association and the second logo area and second code area Wide association, the scope of the first logo area and the second logo area in test specimen image is determined respectively；Respectively in the first logo area and Default sign image is extracted in the range of two logo areas, and the first logo area and the second mark are determined using Hall husband conversion The position of the markings corresponding to sign image is preset in area；The step（1）In pre-arranged code image be bar code；The step（1）In default sign image be del, markings with it is described fall three shape bases it is parallel, it is described fall three The summit of shape is arranged on markings；The base of the del is parallel with the lines in bar code；The step（3）The middle process for determining the first logo area and the position of the markings in the second logo area, including：Three sidelines of del in the first logo area and the second logo area are extracted respectively, and to the del three of extraction Side carries out Hall husband's conversion, and the del for determining to be made up of three line segments according to Hall husband conversion respectively, is fallen Vertex of a triangle, and then obtain the position of markings in the first logo area and the second logo area.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610018039.5A CN105510125B (en) | 2016-01-12 | 2016-01-12 | A kind of Video Extensometer and the markings localization method based on Video Extensometer |
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| CN201610018039.5A CN105510125B (en) | 2016-01-12 | 2016-01-12 | A kind of Video Extensometer and the markings localization method based on Video Extensometer |
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| CN105510125B true CN105510125B (en) | 2018-04-06 |
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| CN109579720B (en) * | 2018-12-07 | 2021-09-24 | 广州大学 | Extensometer dynamic measurement method for measuring edge distance |
| CN109708585A (en) * | 2018-12-07 | 2019-05-03 | 广州大学 | A kind of measurement of unmarked extensometer dynamic and system of view-based access control model tracking |
| 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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| US20080053319A1 (en) * | 2006-09-06 | 2008-03-06 | Illinois Tool Works Inc. | Pad printing of video targets for strain measurement |
| CN102564282A (en) * | 2010-12-15 | 2012-07-11 | 中国科学院金属研究所 | Strain measurement method |
| CN202757592U (en) * | 2012-04-26 | 2013-02-27 | 北京隆盛泰科石油管科技有限公司 | Quasi-bar code extensometer system |
| CN203380703U (en) * | 2013-08-06 | 2014-01-08 | 山东大学 | High-speed orthogonal cutting process strain measurement device based on digital image correlation method |
| CN103440629B (en) * | 2013-08-29 | 2016-06-15 | 浙江理工大学 | Laser labelling is from the digital image processing method of the Video Extensometer of motion tracking |
| CN103575227B (en) * | 2013-09-23 | 2016-07-06 | 西安新拓三维光测科技有限公司 | A kind of vision extensometer implementation method based on digital speckle |
| CN103913375B (en) * | 2014-02-14 | 2016-02-17 | 济南时代试金试验机有限公司 | A kind of tensile sample distortion measurement method relevant based on digital picture |
| CN204255763U (en) * | 2014-11-11 | 2015-04-08 | 金发科技股份有限公司 | Based on the high speed strain proving installation of line-scan digital camera |
| CN205483805U (en) * | 2016-01-12 | 2016-08-17 | 济南大学 | Video extensometer |
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