CN106705874A - Machine-vision-technology-based non-contact measurement system for material deformation - Google Patents
Machine-vision-technology-based non-contact measurement system for material deformation Download PDFInfo
- Publication number
- CN106705874A CN106705874A CN201510437757.1A CN201510437757A CN106705874A CN 106705874 A CN106705874 A CN 106705874A CN 201510437757 A CN201510437757 A CN 201510437757A CN 106705874 A CN106705874 A CN 106705874A
- Authority
- CN
- China
- Prior art keywords
- sample
- measurement system
- video camera
- contact measurement
- unit
- Prior art date
- 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.)
- Pending
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention provides a machine-vision-technology-based non-contact measurement system for material deformation. The non-contact measurement system comprises a stretching side material sample, a stretching device, a camera and a central processor. The stretching device connected with the stretching side material sample is used for stretching the material sample. Two marking lines arranged in parallel are arranged at the material sample. According to the non-contact measurement system, the camera is used for shooting the sample directly; the distance between the marking lines at the sample is measured based on a pixel of a computer display device; and then a deformation value of the sample before stretching and after stretching is calculated. With the measurement system, measurement can be realized without contact between the measurement device and the sample material; the system can be implemented conveniently; the measurement precision is high; the measurement speed is fast; and the work efficiency can be improved.
Description
Technical field
The present invention relates to material deformation fields of measurement, more particularly to a kind of material deformation non-contact measurement system based on machine vision technique.
Background technology
For the physical characteristic of Knowing material, it usually needs be draw textured various types of materials experiment, need to measure the deflection of measured material when being draw textured material experiment.Using contact measurement method the deflection of measurement material at present more, need to set the distance-measuring equipments such as photoelectric encoder using this measuring method, the distance-measuring equipments such as photoelectric encoder are connected by devices such as line, supports with the fixture of clamping sample, then by stretcher come tensile sample, in the drawing process of sample, sample also can stretch the distance-measuring equipment such as photoelectric encoder by fixture, thus it is measurable go out sample variable quantity.But when being measured to sample deformation amount using this contact measurement method, device structure is complex, the step that operates is very cumbersome, because intermediate connector is more, easily produce the link of error more, therefore error inevitably occurs, these can all be impacted to final result of the test.For especially for some light basis weight materials, realized due to clamping unusual trouble, therefore it is difficult with this contact measurement method.How measurement material fast and accurately is draw textured the deflection of experiment is needed the technical problem to be solved badly as those skilled in the art.
The content of the invention
The shortcoming of prior art, the system of the deflection of experiment is draw textured it is an object of the invention to provide a kind of measurement material that can be fast and accurately in view of the above.
In order to achieve the above objects and other related objects, the present invention provides a kind of material deformation non-contact measurement system based on machine vision technique, it is characterised in that it includes：For tensile side material sample, two mark lines be arrangeding in parallel are provided with the material sample；Stretching device, the material sample is connected with the stretching device, and the stretching device is used to stretch the material sample；Video camera, the video camera is used to gather the image information of the material sample；Central processing unit, the central processing unit includes display unit, straight line drawing unit, pixel grey scale comparing unit and metrics calculation unit, the central processing unit is connected with the video camera, the display unit is used to show the picture of the camera acquisition, the straight line drawing unit is used to draw a straight line intersected vertically with two mark lines on the picture that the display unit shows, the pixel grey scale comparing unit is used to judge the straight line and the intersection point of the mark line that the metrics calculation unit to be used to calculate the distance between two intersection points.
Preferably, the mark line Pasting or it is plotted on the sample.
Preferably, the central processing unit is a PC.
Preferably, the video camera is the video camera with USB joint.
As described above, the material deformation non-contact measurement system based on machine vision technique of the invention has the advantages that：Material deformation non-contact measurement system is taken pictures using video camera directly to sample, measures the distance between mark line on sample by the pixel of computer display device, so calculate before stretching and after stretching sample deflection.The measuring system carries out contact without measurement apparatus and sample material can be measured, and implement very convenient, and certainty of measurement is high, measuring speed fast, can effectively improve operating efficiency.
Brief description of the drawings
Fig. 1 is the structured flowchart of embodiment of the present invention central processing unit.
Fig. 2 is the flow chart measured using the embodiment of the present invention.
Fig. 3 is the testing of materials picture that embodiment of the present invention video camera shoots.
Specific embodiment
Embodiments of the present invention are illustrated below by way of specific instantiation, the content that those skilled in the art can be as disclosed by this specification understands other advantages of the invention and effect easily.The present invention can also be embodied or practiced by way of a different and different embodiment, and without departing from the spirit of the present invention the various details in this specification can also carry out various modifications or alterations based on different viewpoints and application.
Refer to Fig. 1,2,3.It should be noted that, diagram provided in the present embodiment only illustrates basic conception of the invention in a schematic way, then component count, shape and size when only display is with relevant component in the present invention rather than according to actual implementation in schema are drawn, it is actual when the implementing kenel of each component, quantity and ratio can be a kind of random change, and its assembly layout kenel be likely to it is increasingly complex.
The present invention provides a kind of material deformation non-contact measurement system based on machine vision technique, and the system includes being used for tensile side material sample, stretching device, video camera and central processing unit.Stretching device is connected with tensile side material sample, states stretching device for expanded material sample.Be can be set on material sample has two mark lines be arrangeding in parallel, and two mark lines be arranged in parallel.The mark line can be rendered directly on material sample using marking pen, it is also possible to be pasted onto on sample between the adhesive tape of strip, and the color of mark line should have certain aberration with the extension of material sample, in order to be differentiated.Video camera is used for the image information of capturing material sample, and video camera should be relative with material sample position, and video camera is generally located on material sample top.
As shown in Figure 1, central processing unit mainly includes display unit 1, straight line drawing unit 2, pixel grey scale comparing unit 3 and metrics calculation unit 4, central processing unit is connected with video camera, as a kind of preferred embodiment, central processing unit can select a PC, video camera is the video camera with USB joint, is so easy to video camera to be connected with PC.Display unit 1 is exactly a display, its picture for being used to show camera acquisition.Straight line drawing unit 2, pixel grey scale comparing unit 3 and metrics calculation unit 4 can be realized by the program in PC, straight line drawing unit 2 is used to draw a straight line intersected vertically with two mark lines on the picture that display unit shows, pixel grey scale comparing unit 3 is used to judge the intersection point of straight line and mark line, and metrics calculation unit 4 is used to calculate the distance between two intersection points.
As shown in Fig. 2 the material deformation non-contact measurement system that should be based on machine vision technique uses following steps when measuring：It is general only to be taken pictures to sample first by the picture signal of video camera collection sample, and the picture signal of shooting is passed into PC, shown by the display unit 1 of PC.Straight line is set on the picture that camera shoots by straight line drawing unit 2 again, the straight line should intersect vertically with mark line, specific to the present invention, can between drawn on the picture that display shows using mouse.And intersection B, C of the straight line and two mark line inside edges are set to reference point, it is also possible to intersection A, D of two mark line outer ledges are set to reference point（As shown in Figure 3）.Due to the grey scale change of pixel on picture, therefore it is easy to judge the position of intersection, the pixel number between two reference points can be thus calculated by pixel grey scale comparing unit 3.
Demarcated according to pixel distance and actual range by metrics calculation unit 4 again, a segment standard distance is first typically set before photo is shot, then taken pictures, measure the pixel number of the segment standard distance, and then pixel distance can be calculated, thus the distance between two mark line inside edges or outer ledge can be calculated according to the pixel number between two reference points.Then by stretching device tensile sample, using same principle, the Sample Image after camera gathers stretching, and the distance between latter two mark line inside edge of stretching is calculated, the difference of front and rear distance twice is exactly the deflection after sample stretching.
Material deformation non-contact measurement system is taken pictures using video camera directly to sample, measures the distance between mark line on sample by the pixel of computer display device, so calculate before stretching and after stretching sample deflection.The measuring system carries out contact without measurement apparatus and sample material can be measured, and implement very convenient, and certainty of measurement is high, measuring speed fast, can effectively improve operating efficiency.So, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.Any person skilled in the art all can carry out modifications and changes under without prejudice to spirit and scope of the invention to above-described embodiment.Therefore, those of ordinary skill in the art is completed under without departing from disclosed spirit and technological thought such as all equivalent modifications or change, should be covered by claim of the invention.
Claims (4)
1. a kind of material based on machine vision technique deforms non-contact measurement system, it is characterised in that it includes：
For tensile side material sample, two mark lines be arrangeding in parallel are provided with the material sample；
Stretching device, the material sample is connected with the stretching device, and the stretching device is used to stretch the material sample；
Video camera, the video camera is used to gather the image information of the material sample；
Central processing unit, the central processing unit includes display unit, straight line drawing unit, pixel grey scale comparing unit and metrics calculation unit, the central processing unit is connected with the video camera, the display unit is used to show the picture of the camera acquisition, the straight line drawing unit is used to draw a straight line intersected vertically with two mark lines on the picture that the display unit shows, the pixel grey scale comparing unit is used to judge the straight line and the intersection point of the mark line that the metrics calculation unit to be used to calculate the distance between two intersection points.
2. the material based on machine vision technique according to claim 1 deforms non-contact measurement system, it is characterised in that：The mark line Pasting is plotted on the sample.
3. the material based on machine vision technique according to claim 1 deforms non-contact measurement system, it is characterised in that：The central processing unit is a PC.
4. the material based on machine vision technique according to claim 3 deforms non-contact measurement system, it is characterised in that：The video camera is the video camera with USB joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510437757.1A CN106705874A (en) | 2015-07-23 | 2015-07-23 | Machine-vision-technology-based non-contact measurement system for material deformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510437757.1A CN106705874A (en) | 2015-07-23 | 2015-07-23 | Machine-vision-technology-based non-contact measurement system for material deformation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106705874A true CN106705874A (en) | 2017-05-24 |
Family
ID=58894657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510437757.1A Pending CN106705874A (en) | 2015-07-23 | 2015-07-23 | Machine-vision-technology-based non-contact measurement system for material deformation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106705874A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109049625A (en) * | 2018-08-29 | 2018-12-21 | 江苏通用科技股份有限公司 | A kind of tire tread stretching measurement apparatus |
| CN109579720A (en) * | 2018-12-07 | 2019-04-05 | 广州大学 | A kind of extensometer dynamic measurement method of Edge Distance measurement |
| CN116202890A (en) * | 2023-05-05 | 2023-06-02 | 山东路达试验仪器有限公司 | Intelligent measuring system and method for elongation of steel bar based on machine vision |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1388108A (en) * | 1970-12-30 | 1975-03-19 | Rubber Plastics Research Ass O | Extensometers |
| JPH03226613A (en) * | 1990-01-31 | 1991-10-07 | Shimadzu Corp | Optical extensometer |
| CN1693874A (en) * | 2005-05-27 | 2005-11-09 | 苏州大学 | High precision measuring method for stretching displacement |
| CN1837747A (en) * | 2006-02-27 | 2006-09-27 | 王化谦 | Double-camera video frequency large-deformation measurement method and video frequency extension device based thereon |
| CN2911653Y (en) * | 2006-02-27 | 2007-06-13 | 王化谦 | Video tensiometer |
| CN102087101A (en) * | 2009-12-04 | 2011-06-08 | 清华大学 | Device and method for measuring strain |
| CN102261894A (en) * | 2011-07-14 | 2011-11-30 | 浙江理工大学 | Method and device for measuring material deformation based on automatic tracking of laser marks |
| CN103674737A (en) * | 2012-08-31 | 2014-03-26 | 曼胡默尔滤清器（上海）有限公司 | Non-contact type measuring method for elongation of material |
| CN104142268A (en) * | 2013-05-09 | 2014-11-12 | 李学华 | Measuring method for micro-deformation of geotechnical material |
-
2015
- 2015-07-23 CN CN201510437757.1A patent/CN106705874A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1388108A (en) * | 1970-12-30 | 1975-03-19 | Rubber Plastics Research Ass O | Extensometers |
| JPH03226613A (en) * | 1990-01-31 | 1991-10-07 | Shimadzu Corp | Optical extensometer |
| CN1693874A (en) * | 2005-05-27 | 2005-11-09 | 苏州大学 | High precision measuring method for stretching displacement |
| CN1837747A (en) * | 2006-02-27 | 2006-09-27 | 王化谦 | Double-camera video frequency large-deformation measurement method and video frequency extension device based thereon |
| CN2911653Y (en) * | 2006-02-27 | 2007-06-13 | 王化谦 | Video tensiometer |
| CN102087101A (en) * | 2009-12-04 | 2011-06-08 | 清华大学 | Device and method for measuring strain |
| CN102261894A (en) * | 2011-07-14 | 2011-11-30 | 浙江理工大学 | Method and device for measuring material deformation based on automatic tracking of laser marks |
| CN103674737A (en) * | 2012-08-31 | 2014-03-26 | 曼胡默尔滤清器（上海）有限公司 | Non-contact type measuring method for elongation of material |
| CN104142268A (en) * | 2013-05-09 | 2014-11-12 | 李学华 | Measuring method for micro-deformation of geotechnical material |
Non-Patent Citations (1)
| Title |
|---|
| 葛云燕等: "《视频引伸计》", 《工程与试验》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109049625A (en) * | 2018-08-29 | 2018-12-21 | 江苏通用科技股份有限公司 | A kind of tire tread stretching measurement apparatus |
| CN109049625B (en) * | 2018-08-29 | 2024-02-13 | 江苏通用科技股份有限公司 | Tyre tread stretching measuring device |
| CN109579720A (en) * | 2018-12-07 | 2019-04-05 | 广州大学 | A kind of extensometer dynamic measurement method of Edge Distance measurement |
| CN109579720B (en) * | 2018-12-07 | 2021-09-24 | 广州大学 | Extensometer dynamic measurement method for measuring edge distance |
| CN116202890A (en) * | 2023-05-05 | 2023-06-02 | 山东路达试验仪器有限公司 | Intelligent measuring system and method for elongation of steel bar based on machine vision |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106370120A (en) | Material deformation non-contact measurement method based on machine vision technology | |
| CN104048744B (en) | A kind of contactless real-time online vibration measurement method based on image | |
| CN204730814U (en) | A kind of parts passer based on line laser three-dimensional measurement | |
| CN102589516B (en) | Dynamic distance measuring system based on binocular line scan cameras | |
| CN204807395U (en) | Material warp measuring device based on two camera machine vision technique | |
| TWI549482B (en) | Detection Method for Camera | |
| CN104266608A (en) | Field calibration device for visual sensor and calibration method | |
| US11562478B2 (en) | Method and system for testing field of view | |
| CN104729406A (en) | Machine vision positioning method for element surface mounting | |
| CN108833912A (en) | A kind of measurement method and system of video camera machine core optical axis center and field angle | |
| US10309768B2 (en) | Profile measuring method, profile measuring apparatus, and deformation detecting apparatus | |
| CN106705874A (en) | Machine-vision-technology-based non-contact measurement system for material deformation | |
| CN104034516A (en) | Machine vision based LED detection device and detection method thereof | |
| CN107238534A (en) | The method and device of on-line monitoring plate stretch performance is calculated based on image | |
| Lai et al. | Aesthetic defect characterization of a polymeric polarizer via structured light illumination | |
| CN106595496A (en) | Man-machine interaction part size flexibility vision measurement method | |
| CN106441163A (en) | Non-contact column verticality detection method and device | |
| CN103544524A (en) | Bar reviewing-counting method and device | |
| CN106018179A (en) | Glue material surface viscosity measurement method and device based on image processing | |
| TWI417774B (en) | Optical distance determination device, optical touch monitor system and method for measuring distance of a touch point on an optical touch panel | |
| CN107702787A (en) | Visual vibrating displacement four-dimension measuring method based on common picture pick-up device | |
| CN108876842A (en) | A kind of measurement method, system, equipment and the storage medium of sub-pixel edge angle | |
| CN104019752B (en) | The thickness evenness detection method of display screen, Apparatus and system | |
| CN204303031U (en) | Based on the camera multifunctional caliberating device of optical projector | |
| CN106780335A (en) | The method that broad surface flow field figure picture is obtained using connecting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170524 |
|
| RJ01 | Rejection of invention patent application after publication |