CN104359429A - Contact area measurement method and system based on image measuring technique - Google Patents
Contact area measurement method and system based on image measuring technique Download PDFInfo
- Publication number
- CN104359429A CN104359429A CN201410743752.7A CN201410743752A CN104359429A CN 104359429 A CN104359429 A CN 104359429A CN 201410743752 A CN201410743752 A CN 201410743752A CN 104359429 A CN104359429 A CN 104359429A
- Authority
- CN
- China
- Prior art keywords
- contact
- contact area
- image
- light
- module
- 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.)
- Granted
Links
Landscapes
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a contact area measurement method based on an image measuring technique. The method comprises the following steps: adjusting a light ray range and scattering light rays after a light source provides the light rays, thereby providing a uniform light field for contact bodies; loading the contact bodies so as to form a contact region; photographing a contact body which is loaded under a uniform light field by a camera, and collecting images of contact parts; and analyzing the images of the contact parts for boundary recognition, determining the contact width, and calculating the contact area among the contact bodies. The invention also discloses a contact area measurement system based on the image measuring technique, and the system is matched with the contact bodies and is used for measuring the contact area among the contact bodies. The system comprises a backlight module, an image collecting module and a contact area recognition module. The method and the system have the advantages of noncontact, high precision, continuity, capability of performing high-temperature environment measurement and the like, and can be used for automatically measuring the contact area under various working conditions.
Description
Technical field
The application relates to Structural Design and image measurement field, specifically, relates to a kind of contact area measuring method based on image measurement technology and system.
Background technology
Contact very common in engineer applied, as the rolling on rail of the process of the roll rolled plate of the engagement between two gears, rolling mill, wheel and bridge roll the contact etc. of seat.
The contact form of two objects is divided into point cantact and linear contact lay, and the former contacts with interplanar as spheroid, and the latter is as the contact between right cylinder and plane, and two kinds of contact models as shown in Figure 1.In order to study the mechanical behavior of contact structures, such as, measure the contact strength of contact, researchist needs to measure the contact area between contact.Cannot directly observe because contact area is blocked, thus the measurement of contact area becomes very difficult.
The development course measuring contact area method goes through two stages, the representative method of first stage is indentation method and scarification, the vestige measurement contact area that these class methods stay in contact process by observing contact, specifically unload after two articles contact loads, carried out calculating contact area by observing and measuring by the physical dimension of the laminate body impression residual because of compressive deformation and cut.These class methods also exist 2 obvious defects: one, indentation method and scarification because the experiment method adding unloading continuously cause cannot continuous coverage; Its two, its Measurement Resolution is very low, and when contact area is less, impression and cut often can not observe.
In order to solve the defect of above-mentioned two kinds of methods, measure contact area method and be developed to subordinate phase, its representative is pressure-sensitive paper method and piezoelectric membrane method, and these class methods place sensor between two contacts, and the contact area of contact object is converted to other information to measure.Pressure-sensitive paper method is that (a slice inside is full of coloring agent capsule by two panels pressure-sensitive paper, with developer in a slice) be placed between contact, when object contact pressurized, coloring agent capsules break, on one deck pressure-sensitive paper having developer, contact site branch shows for redness, carrys out calculating contact area finally by measurement red area area.Piezoelectric membrane method puts into electronic sensor or sensitive grid between two contact objects, and when object contact pressurized, contact area can produce electric signal, and the position produced by analyzing electric signal just can be measured and obtain contact area.This class measure the method for contact area solve indentation method and scarification can not the problem of continuous coverage, and measuring accuracy to be improved greatly.But this kind of new method also also exists the problem of self: one, pressure-sensitive paper and piezoelectric membrane cannot be used in the extreme experimental situations such as high temperature; Its two, arrange that sensor information likely can change the character at interface at contact area, thus change the local mechanical character of contact area, affect the authenticity of experimental result.In view of this, current existing contact area measuring method or measurement environment require higher, or measuring accuracy is poor, is difficult to the measurement demand meeting various contact area.
Summary of the invention
The present invention proposes a kind of can meet varying environment under the contact area method for continuous measuring that uses, designed and Implemented corresponding measuring system simultaneously.The method, based on image measurement technology, by gathering the image of contact site and carrying out analysis to it and obtain contact area, achieves continuous print high-acruracy survey.The measuring system of building based on the method is simple to operate, low consumption, and data processing can complete in robotization.Exist in techniques and methods for existing measurement contact area cannot meet measurement under hot environment, cannot Continuous Observation, affect the shortcomings such as the mechanical property of contact own, precision be not high, the present invention proposes a kind of can meet varying environment under the contact area method for continuous measuring that uses, provide corresponding measuring system simultaneously.
The invention provides a kind of contact area measuring method based on image measurement technology, the method comprises the following steps:
After light source provides light, adjustment light range by light scattering, for contact provides uniform light field;
Load contact, form contact area;
Utilizing camera to take being in the contact of stand under load under uniform light field, gathering contact site image;
Analyze described contact site image, carry out Boundary Recognition, determine contact width and calculate the contact area between contact.
Preferably, after described light source provides light, adjustment light range by light scattering, for contact provides uniform light field, be: after described light source provides light utilize mobile aperture to adjust range of exposures further, utilize white curtain by light scattering, for contact provides uniform light field.
Preferably, described analysis described contact site image, carries out Boundary Recognition, determines the contact area between contact width and contact, be further:
When contact be spheroid and cube formed contact time, contact area is circular, and the contact width determined is the diameter d of contact area, and contact area equals π × (d/2)
2;
When contact be right cylinder and cube formed contact time, contact area is rectangle, and the contact width that contact area equals to determine is multiplied by cylindrical length.
The present invention also provides a kind of contact area measuring system based on image measurement technology, and this system matches with contact, and for measuring the contact area between contact, this system comprises: backlight module, image capture module and contact area identification module, wherein,
Described backlight module, couples mutually with described contact, for providing uniform light field for described contact;
Described contact, coupling mutually with described backlight module and described image capture module respectively, for forming contact area in the light field of described backlight module, and being collected contact site image by described image capture module;
Described image capture module, couples mutually with described contact and described contact area identification module respectively, for collecting the contact site image of contact and being sent to described contact area identification module;
Described contact area identification module, couples mutually with described image capture module, and the contact site image sent for receiving described image capture module carries out Boundary Recognition and obtains contact width and calculate the contact area between contact.
Preferably, described backlight module, comprising: light source, mobile aperture and white curtain, wherein,
Described light source, couples, for providing light mutually with described mobile aperture;
Described mobile aperture, couples, for adjusting the irradiation area of described light source mutually with described light source and described white curtain respectively;
Described white curtain, couples mutually with described mobile aperture and described contact respectively, is sent to described contact for described light is carried out scattering, and this white curtain is also used as white background simultaneously.
Preferably, be also provided with camera further in described image capture module, this camera couples mutually with described contact and described contact area identification module respectively, and the contact site image for collecting contact is sent to described contact area identification module.
Preferably, described contact is the contact that right cylinder and cube are formed further; Or be the contact that spheroid and cube are formed further.
Preferably, described contact is the contact that graphite cylinder and graphite square brick are formed further; Or be the contact that graphite nodule and graphite square brick are formed further.
Compared with prior art, the contact area measuring method based on image measurement technology described in the application and system, the method and system have noncontact, high precision, continuously and can meet the advantages such as hot environment measurement, can the measurement completing contact area under various operating mode of robotization, reach following effect:
1) the contact area measuring method based on image measurement technology provided by the invention and system, can completely cut off measuring system and object being measured and come, solve the lower problem cannot measuring contact area of the extreme conditions such as high temperature like this;
2) the contact area measuring method based on image measurement technology provided by the invention and system, achieves the metering system of shooting continuously, also achieves the Real-time Collection in loading procedure simultaneously;
3) the contact area measuring method based on image measurement technology provided by the invention and system, measuring accuracy can reach sub-pix rank.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present application, and form a application's part, the schematic description and description of the application, for explaining the application, does not form the improper restriction to the application.In the accompanying drawings:
Fig. 1 is point cantact and linear contact lay schematic diagram;
Fig. 2 is the contact area measuring method schematic flow sheet based on image measurement technology provided by the invention;
Fig. 3 is the contact area measuring system structural representation based on image measurement technology provided by the invention;
Fig. 4 is that picture is demarcated in graphite line contact;
Fig. 5 is that graphite line contact experiment gathers image and to the contact profile after its Boundary Recognition;
Fig. 6 is that graphite line contact half-breadth is with load change curve;
Fig. 7 is that under hot environment, grey spots contact experiment gathers image and to contact profile after its Boundary Recognition;
Fig. 8 be under hot environment grey spots contact radius with load change curve.
Embodiment
As employed some vocabulary to censure specific components in the middle of instructions and claim.Those skilled in the art should understand, and hardware manufacturer may call same assembly with different noun.This specification and claims are not used as with the difference of title the mode distinguishing assembly, but are used as the criterion of differentiation with assembly difference functionally." comprising " as mentioned in the middle of instructions and claim is in the whole text an open language, therefore should be construed to " comprise but be not limited to "." roughly " refer to that in receivable error range, those skilled in the art can solve the technical problem within the scope of certain error, reach described technique effect substantially.In addition, " couple " word and comprise directly any and indirectly electric property coupling means at this.Therefore, if describe a first device in literary composition to be coupled to one second device, then represent described first device and directly can be electrically coupled to described second device, or be indirectly electrically coupled to described second device by other devices or the means that couple.Instructions subsequent descriptions is implement the better embodiment of the application, and right described description is for the purpose of the rule that the application is described, and is not used to the scope limiting the application.The protection domain of the application is when being as the criterion depending on the claims person of defining.
Below in conjunction with accompanying drawing, the application is described in further detail, but not as the restriction to the application.
Embodiment one:
The present embodiment is for the contact area between the cylindrical member measured graphite material and make and square brick, and be described in detail to the specific embodiment of the present invention, embodiment is as follows:
The present embodiment provides a kind of contact area measuring system based on image measurement technology as shown in Figure 3, this system matches with contact 302, for measuring the contact area between contact, comprising: backlight module 301, image capture module 303 and contact area identification module 304.
The effect of backlight module 301 is for contact 302 provides a uniform light field, and this module is made up of light source 3011, mobile aperture 3012, white curtain 3,013 three part.The back side acting on contact 302 of light source 3011 provides light.Mobile aperture 3012 utilizes two transportable objects that block to form, and reasonably can adjust the irradiation area of light source.The effect of white curtain 3013 has two, first is that the light that light source 3011 will be penetrated carries out scattering, make contact profile in the picture of shooting more clear by the reason of light scattering, because in measuring process, the light field that shooting area needs light intensity to be evenly distributed, for the linear light source that similar LED provides, in any case adjustment light source position and light intensity all cannot meet the demands, and this effect after light scattering, just will can be reached; Second effect is the effect will playing a kind of white background cloth, and the contact area aberration that camera is taken is obvious, and profile is more clear.Two requirements are had for white curtain 3013, first material character skewness, here material character skewness refers to material and non-isotropy, form in the material of white curtain and be mingled with impurity or uneven agglomerate makes light scattering can occur in through white curtain, can meet the requirement of light scattering like this, next to be object color be white, can meet its requirement as white background cloth.
Contact 302, coupling mutually with backlight module 301 and image capture module 303 respectively, for forming contact area in the uniform light field of backlight module 301, and being collected contact site image by image capture module 303.Contact 302 is the contact that right cylinder and cube are formed further; Or be the contact that spheroid and cube are formed further.In the present embodiment, contact 302 is the contact that graphite cylinder and graphite square brick are formed, and forms linear contact lay between contact.Certainly do not do concrete restriction to the form of contact 302 here, contact 302 can also be the contact that triangular form centrum and plane are formed, and also can be the contact that cylindroid and plane are formed, concrete determines according to actual conditions.
Image capture module 303, couples mutually with contact 302 and contact area identification module 304 respectively, for collecting the contact site image of contact 302 and being sent to contact area identification module 304.Be provided with camera 3031 further in image capture module 303 in the present embodiment, further camera 3031 is IPX-16M3-L high resolution camera.The effect of image capture module 303: taking continuously being in the contact of stand under load under uniform light field, obtaining digital image information.Before contact 302 is taken, want the camera that uses in first adjusting module and camera lens, in order to meet requirement when aftertreatment calculates, need contact global feature part (part over half of such as right cylinder or spheroid) to hold among picture.After selected shooting area, adjusting focal length, make contact area present clearly as.Because the resolution unit that camera 3031 gathers picture is pixel, need demarcate at contact area after Image Adjusting is clear, make the resolution unit of collection picture be converted into standard length unit.After Focussing, as far as possible aperture is tuned up under the prerequisite that contact 302 profile whole-body can identify, the light intensity magnitude of white curtain 3013 background can be increased like this, make contact 302 and background gray scale difference more obvious, be convenient to identify.After camera lens adjustment, set collected by camera speed and just in the process of experiment, Real-time Collection can be carried out to image.
Contact area identification module 304, couple mutually with image capture module 303, the contact site image row bound identification of going forward side by side sent for receiving image capture module 303 obtains contact width, and the contact area calculated between contact, be that right cylinder contacts with cubical in the present embodiment, its contact area is a rectangular parallelepiped, and the contact width recorded is multiplied by cylindrical length just can calculate contact area.Contact area identification module 304 effect is that the image gathered in image capture module is carried out Boundary Recognition.In the picture, border represents the terminal of a characteristic area and the starting point of another characteristic area.Internal feature or the attribute of border institute separation region are consistent, and the internal feature of zones of different or attribute have larger difference, and Boundary Recognition utilizes object and the difference of background in certain picture characteristics to realize just.This species diversity comprises gray scale, color etc.In fact Boundary Recognition is exactly the position that detected image characteristic changes.Boundary characteristic in the present invention is the gray-scale value of image, and the gray-scale value of bright side, border is larger, and border opposite side gray-scale value is little, border be the terminal of gray-scale value compared with large regions, another side is the starting point of gray-scale value compared with zonule.Image taken by camera 3031 is gray level image, reads in software by shooting image, can obtain the gray-scale value of each pixel, and contact part gray scale is low, and white curtain 3013 gray-scale value is high, and boundaries on either side gray-scale value difference is very large.After by Boundary Recognition, just contact profile can be obtained, " connection " part of profile is the contact area of contact object, (contact has upper and lower two to the contact area that just can obtain between contact by the contact area width obtained, the contact area of the contact and lower contact body that are positioned at top is actually one, time Boundary Recognition is carried out to image, the profile of overlying contact body and the profile of lower contact body can be identified, having overlapping region between two profiles is be communicated with together, this connected component is exactly the contact area of two contacts).
The present embodiment also provides a kind of contact area measuring method based on image measurement technology, and as shown in Figure 2, the method comprises the following steps:
Step 201: light source provides light, adjustment light range by light scattering, for contact provides uniform light field;
Step 202: load contact, forms contact area;
Step 203: utilizing camera to take being in the contact of stand under load under uniform light field, gathering contact site image;
Step 204: analyze described contact site image, carry out Boundary Recognition, determine contact width, and calculate the contact area between contact.
The load change curve of the contact half-breadth between contact with loading can also be obtained in step 204.
Step 201, is further: after described light source provides light, utilizes mobile aperture to adjust range of exposures, utilizes white curtain by light scattering, for contact provides uniform light field.
Step 203, is further:
Utilizing IPX-16M3-L high resolution camera to take being in the contact of stand under load under uniform light field, gathering contact site image.
Step 204, is further:
When contact be spheroid and cube formed contact time, contact area is circular, and the contact width determined is the diameter d of contact area, and contact area equals π × (d/2)
2;
When contact be right cylinder and cube formed contact time, contact area is rectangle, and the contact width that contact area equals to determine is multiplied by cylindrical length.Graphite cylinder in the present embodiment is of a size of Φ 50 × 60mm, and graphite square brick is of a size of 100 × 100 × 60mm.Loading equipemtn is MTS810 material property testing machine.Before the present embodiment, first set up the light source 3011 in backlight module, mobile aperture 3012, white curtain 3013, in the present embodiment, light source 3011 uses LED, and mobile aperture 3012 uses low-carbon (LC) bloom to form, and white curtain 3013 is suitable for common A4 blank sheet of paper.At environmental cabinet outside tripod erection IPX-16M3-L high resolution camera after backlight module 301 each several part has been built.
After being set up by camera, enter image capture module 303.Graduated for band demarcation paper by graphite end face shooting clear, and is pasted onto cylinder end face by adjustment camera focus, and now take a pictures for demarcating object plane resolution, the demarcation picture of graphite contact body 302 as shown in Figure 4.After having taken, the demarcation paper of stickup is taken, and camera aperture is adjusted to maximum.After camera debugging, open testing machine and load, loading velocity is 0.1mm/min, opens the image capturing system of high resolution camera simultaneously, and picking rate is 0.2fps.When load reaches 50KN, stop testing machine loading and camera image collection simultaneously.
After the present embodiment image acquisition terminates, the image gathered by the present embodiment imports contact area identification module 304, utilizes software to identify contact border in image.The image obtained after Boundary Recognition, contact profile is shown as white, and remaining area is shown as black, graphite cylinder border and graphite brick profile intersection point are both contact points, the image of the present embodiment collection and the contact profile after Boundary Recognition is carried out as shown in Figure 5 to image, part between two contact points is the contact width of graphite cylinder and graphite brick, can be obtained the contact area of graphite line contact by the contact width obtained.Fig. 6 is the result of variations contacting half-breadth in the continuous loading procedure of graphite contact body obtained by the present embodiment.
Embodiment two:
The present embodiment, to measure the contact area between spherical component and square brick that in hot environment, graphite material is made, is described in detail to the present invention's embodiment in hot environment.
The present embodiment provides a kind of contact area measuring system based on image measurement technology as shown in Figure 3, this system matches with contact 302, for measuring the contact area between contact, comprising: backlight module 301, image capture module 303 and contact area identification module 304.
The effect of backlight module 301 is for contact 302 provides a uniform light field, and this module is made up of light source 3011, mobile aperture 3012, white curtain 3,013 three part.The back side acting on contact 302 of light source 3011 provides light.Mobile aperture 3012 utilizes two transportable objects that block to form, and reasonably can adjust the irradiation area of light source.The effect of white curtain 3013 has two, first is that the light that light source 3011 will be penetrated carries out scattering, make contact profile in the picture of shooting more clear by the reason of light scattering, because in measuring process, the light field that shooting area needs light intensity to be evenly distributed, for the linear light source that similar LED provides, in any case adjustment light source position and light intensity all cannot meet the demands, and this effect after light scattering, just will can be reached; Second effect is the effect will playing a kind of white background cloth, and the contact area aberration that camera is taken is obvious, and profile is more clear.Requirement for white curtain 3013 is identical with embodiment one.
Contact 302, coupling mutually with backlight module 301 and image capture module 303 respectively, for forming contact area in the uniform light field of backlight module 301, and being collected contact site image by image capture module 303.Contact 302 is the contact that right cylinder and cube are formed further, or is the contact that spheroid and cube are formed further.In the present embodiment, contact 302 is the contact that graphite nodule and graphite square brick are formed, and forms point cantact between contact.Certainly do not do concrete restriction to the form of contact 302 here, contact 302 can also be the contact that triangular form centrum and plane are formed, and also can be the contact that cylindroid and plane are formed, concrete determines according to actual conditions.
Image capture module 303, couples mutually with contact 302 and contact area identification module 304 respectively, for collecting the contact site image of contact 302 and being sent to contact area identification module 304.Be provided with camera 3031 further in image capture module 303 in the present embodiment, further camera 3031 is IPX-16M3-L high resolution camera.The effect of image capture module 303: taking continuously being in the contact of stand under load under uniform light field, obtaining digital image information.Before contact 302 is taken, want the camera that uses in first adjusting module and camera lens, in order to meet requirement when aftertreatment calculates, need contact global feature part (part over half of such as right cylinder or spheroid) to hold among picture.After selected shooting area, adjusting focal length, make contact area present clearly as.Because the resolution unit that camera 3031 gathers picture is pixel, need demarcate at contact area after Image Adjusting is clear, make the resolution unit of collection picture be converted into standard length unit.After Focussing, as far as possible aperture is tuned up under the prerequisite that contact 302 profile whole-body can identify, the light intensity magnitude of white curtain 3013 background can be increased like this, make contact 302 and background gray scale difference more obvious, be convenient to identify.After camera lens adjustment, set collected by camera speed and just in the process of experiment, Real-time Collection can be carried out to image.
Contact area identification module 304, couple mutually with image capture module 303, the contact site image row bound identification of going forward side by side sent for receiving image capture module 303 obtains contact width, and the contact area calculated between contact is (as contacting with cubical for spheroid in the present embodiment, in fact contact width is exactly the diameter d of contact area (circle), π × (d/2)
2be contact area area).Contact area identification module 304 effect is that the image gathered in image capture module is carried out Boundary Recognition.In the picture, border represents the terminal of a characteristic area and the starting point of another characteristic area, internal feature or the attribute of border institute separation region are consistent, and the internal feature of zones of different or attribute have larger difference, Boundary Recognition utilizes object and the difference of background in certain picture characteristics to realize just.This species diversity comprises gray scale, color etc.In fact Boundary Recognition is exactly the position that detected image characteristic changes.Image taken by camera 3031 is gray level image, reads in software by shooting image, can obtain the gray-scale value of each pixel, and contact part gray scale is low, and white curtain 3013 gray-scale value is high, and boundaries on either side gray-scale value difference is very large.After by Boundary Recognition, just contact profile can be obtained, " connection " part of profile is the contact area of contact object, (contact has upper and lower two to the contact area that just can obtain between contact by the contact area width obtained, the contact area of the contact and lower contact body that are positioned at top is actually one, time Boundary Recognition is carried out to image, the profile of overlying contact body and the profile of lower contact body can be identified, having overlapping region between two profiles is be communicated with together, this connected component is exactly the contact area of two contacts).
The present embodiment also provides a kind of contact area measuring method based on image measurement technology, and as shown in Figure 2, the method comprises the following steps:
Step 201: light source provides light, adjustment light range by light scattering, for contact provides uniform light field;
Step 202: load contact, forms contact area;
Step 203: utilizing camera to take being in the contact of stand under load under uniform light field, gathering contact site image;
Step 204: analyze described contact site image, carry out Boundary Recognition, determine contact width, then calculate the contact area between contact.
The load change curve of the contact half-breadth between contact with loading can also be obtained in step 204.
Step 201, is further: after described light source provides light, utilizes mobile aperture to adjust light range, utilizes white curtain by light scattering, for contact provides uniform light field.
Step 203, is further:
Utilizing IPX-16M3-L high resolution camera to take being in the contact of stand under load under uniform light field, gathering contact site image.
Step 204, is further:
When contact be spheroid and cube formed contact time, contact area is circular, and the contact width determined is the diameter d of contact area, and contact area equals π × (d/2)
2;
When contact be right cylinder and cube formed contact time, contact area is rectangle, and the contact width that contact area equals to determine is multiplied by cylindrical length.
Diameter of graphite ball 40mm in the present embodiment, graphite square brick and loading equipemtn identical with embodiment one.Warming-up device is MTS8651 environmental cabinet.In order to ensure the quality of shooting image, environmental cabinet view window uses the ultrawhite quartz glass of resistance to 1600 DEG C of high temperature.Before measuring, light source 3011, mobile aperture 3012, the white curtain 3013 set up in environmental cabinet in backlight module is needed.In the present embodiment, light source 3011 uses 500 degrees Celsius of high temperature resistant lamps, and the low-carbon (LC) bloom that 3012, mobile aperture is wrapped up by asbestos forms, the high temperature resistant paper that 3013, white curtain uses ceramic fiber to make.At environmental cabinet outside tripod erection IPX-16M3-L high resolution camera after light source module each several part has been built.
After being set up by camera, enter image capture module.Turn on high temperature resistant lamp, preprepared is demarcated thing surface and align with surface of contact, adjustment camera focus will demarcate thing surface shooting clear, now take a pictures and differentiate for demarcating object plane.After having taken, thing will be demarcated and take out, and camera aperture will be adjusted to maximum.After camera debugging, open environmental cabinet heating apparatus, temperature is risen to 200 DEG C.When environmental cabinet temperature stabilization, open testing machine and load, loading velocity is 0.1mm/min, opens the image capturing system of high resolution camera simultaneously, and picking rate is 0.2fps.When load reaches 12KN, stop testing machine loading and camera image collection simultaneously.
Contact area identification module flow process is carried out under the high temperature conditions identical with embodiment one in the present embodiment, Fig. 7 is the image of high temperature experiment collection and carries out the contact profile after Boundary Recognition to image, and Fig. 8 is the result of variations of contact radius in the continuous loading procedure of graphite contact body obtained by experiment.
Compared with prior art, the contact area measuring method based on image measurement technology described in the application and system, the method and system have noncontact, high precision, continuously and can meet the advantages such as hot environment measurement, can the measurement completing contact area under various operating mode of robotization, reach following effect:
Contact area measuring method based on image measurement technology provided by the invention and system, can completely cut off measuring system and object being measured and come, cannot measure the problem of contact area under solving high temperature like this; Contact area measuring method based on image measurement technology provided by the invention and system, achieve the metering system of shooting continuously, also achieve the Real-time Collection in loading procedure simultaneously; Contact area measuring method based on image measurement technology provided by the invention and system, measuring accuracy can reach sub-pix rank.
Above-mentioned explanation illustrate and describes some preferred embodiments of the application, but as previously mentioned, be to be understood that the application is not limited to the form disclosed by this paper, should not regard the eliminating to other embodiments as, and can be used for other combinations various, amendment and environment, and can in application contemplated scope described herein, changed by the technology of above-mentioned instruction or association area or knowledge.And the change that those skilled in the art carry out and change do not depart from the spirit and scope of the application, then all should in the protection domain of the application's claims.
Claims (8)
1., based on a contact area measuring method for image measurement technology, it is characterized in that, the method comprises the following steps:
After light source provides light, adjustment light range by light scattering, for contact provides uniform light field;
Load contact, form contact area;
Utilizing camera to take being in the contact of stand under load under uniform light field, gathering contact site image;
Analyze described contact site image, carry out Boundary Recognition, determine contact width and calculate the contact area between contact.
2. the contact area measuring method based on image measurement technology according to claim 1, it is characterized in that, after described light source provides light, adjustment light range by light scattering, for contact provides uniform light field, be: after described light source provides light utilize mobile aperture to adjust range of exposures further, utilize white curtain by light scattering, for contact provides uniform light field.
3. the contact area measuring method based on image measurement technology according to claim 1, is characterized in that, described analysis described contact site image, carries out Boundary Recognition, determines the contact area between contact width and contact, be further:
When contact be spheroid and cube formed contact time, contact area is circular, and the contact width determined is the diameter d of contact area, and contact area equals π × (d/2)
2;
When contact be right cylinder and cube formed contact time, contact area is rectangle, and the contact width that contact area equals to determine is multiplied by cylindrical length.
4. based on a contact area measuring system for image measurement technology, this system matches with contact, for measuring the contact area between contact, it is characterized in that, this system comprises: backlight module, image capture module and contact area identification module, wherein,
Described backlight module, couples mutually with described contact, for providing uniform light field for described contact;
Described contact, coupling mutually with described backlight module and described image capture module respectively, for forming contact area in the light field of described backlight module, and being collected contact site image by described image capture module;
Described image capture module, couples mutually with described contact and described contact area identification module respectively, for collecting the contact site image of contact and being sent to described contact area identification module;
Described contact area identification module, couples mutually with described image capture module, and the contact site image sent for receiving described image capture module carries out Boundary Recognition and obtains contact width and calculate the contact area between contact.
5. the contact area measuring system based on image measurement technology according to claim 4, it is characterized in that, described backlight module, comprising: light source, mobile aperture and white curtain, wherein,
Described light source, couples, for providing light mutually with described mobile aperture;
Described mobile aperture, couples, for adjusting the irradiation area of described light source mutually with described light source and described white curtain respectively;
Described white curtain, couples mutually with described mobile aperture and described contact respectively, is sent to described contact for described light is carried out scattering, and this white curtain is also used as white background simultaneously.
6. the contact area measuring system based on image measurement technology according to claim 4, it is characterized in that, also camera is provided with further in described image capture module, this camera couples mutually with described contact and described contact area identification module respectively, and the contact site image for collecting contact is sent to described contact area identification module.
7. the contact area measuring system based on image measurement technology according to claim 4, is characterized in that, described contact, is the contact that right cylinder and cube are formed further; Or be the contact that spheroid and cube are formed further.
8. the contact area measuring system based on image measurement technology according to claim 4, is characterized in that, described contact, is the contact that graphite cylinder and graphite square brick are formed further; Or be the contact that graphite nodule and graphite square brick are formed further.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410743752.7A CN104359429B (en) | 2014-12-08 | 2014-12-08 | Contact area measurement system based on image measuring technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410743752.7A CN104359429B (en) | 2014-12-08 | 2014-12-08 | Contact area measurement system based on image measuring technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104359429A true CN104359429A (en) | 2015-02-18 |
| CN104359429B CN104359429B (en) | 2017-02-22 |
Family
ID=52526714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410743752.7A Expired - Fee Related CN104359429B (en) | 2014-12-08 | 2014-12-08 | Contact area measurement system based on image measuring technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104359429B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108592798A (en) * | 2018-04-08 | 2018-09-28 | 南京航空航天大学 | A kind of rotating shaft lip-shaped sealing part contact surface measurement method and device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1167134A (en) * | 1997-08-25 | 1999-03-09 | Nikon Corp | Inspection device |
| JP2000019112A (en) * | 1998-06-29 | 2000-01-21 | Shin Nippon Air Technol Co Ltd | Device and method for detecting aerosol |
| US20060284631A1 (en) * | 2005-05-31 | 2006-12-21 | Hamren Steven L | Imaging test socket, system, and method of testing an image sensor device |
| CN101865679A (en) * | 2010-06-18 | 2010-10-20 | 杭州双树科技有限公司 | Plane area measuring method based on digital image technology |
| CN103445759A (en) * | 2013-09-06 | 2013-12-18 | 重庆大学 | Self-operated measuring unit for reaction of pupil aperture to light based on digital image processing |
| CN103644865A (en) * | 2013-11-08 | 2014-03-19 | 广东出入境检验检疫局检验检疫技术中心 | Plane area measuring method based on digital image analysis |
-
2014
- 2014-12-08 CN CN201410743752.7A patent/CN104359429B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1167134A (en) * | 1997-08-25 | 1999-03-09 | Nikon Corp | Inspection device |
| JP2000019112A (en) * | 1998-06-29 | 2000-01-21 | Shin Nippon Air Technol Co Ltd | Device and method for detecting aerosol |
| US20060284631A1 (en) * | 2005-05-31 | 2006-12-21 | Hamren Steven L | Imaging test socket, system, and method of testing an image sensor device |
| CN101865679A (en) * | 2010-06-18 | 2010-10-20 | 杭州双树科技有限公司 | Plane area measuring method based on digital image technology |
| CN103445759A (en) * | 2013-09-06 | 2013-12-18 | 重庆大学 | Self-operated measuring unit for reaction of pupil aperture to light based on digital image processing |
| CN103644865A (en) * | 2013-11-08 | 2014-03-19 | 广东出入境检验检疫局检验检疫技术中心 | Plane area measuring method based on digital image analysis |
Non-Patent Citations (1)
| Title |
|---|
| 马方圆，王显，马少鹏: "基于图像分析的金属颈缩过程实验测量方法", 《力学与实践》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108592798A (en) * | 2018-04-08 | 2018-09-28 | 南京航空航天大学 | A kind of rotating shaft lip-shaped sealing part contact surface measurement method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104359429B (en) | 2017-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103940822A (en) | Product outer surface defect image acquisition device based on machine vision | |
| CN105547182A (en) | Spinneret plate detection equipment and method | |
| CN203824928U (en) | Product outer surface defect image acquisition device based on machine vision | |
| CN102135236A (en) | Automatic non-destructive testing method for internal wall of binocular vision pipeline | |
| CN105842062A (en) | Real-time crack propagation monitoring device and real-time crack propagation monitoring method | |
| CN105092607A (en) | Method for evaluating surface defects of spherical optical components | |
| CN103592808A (en) | Compact polarization imaging camera wide in field of view | |
| CN105372257A (en) | Optical membrane inspecting device | |
| CN103630554A (en) | Detection device and method for defects on double faces of lens | |
| CN103234979A (en) | Glass bottle defect detection apparatus and image splitting device | |
| CN104849281B (en) | A kind of material surface crack number and method for detecting position | |
| CN107271445A (en) | Defect detection method and device | |
| CN203881301U (en) | Concrete crack field detection and imaging device | |
| CN104180772B (en) | A kind of vision inspection apparatus | |
| CN107356596A (en) | Underwater spotting imaging device and optical imagery method water turbidity online test method | |
| RU2665323C1 (en) | Sample at the high-temperature impact thereon geometrical parameters and / or deformations measurement method and system for its implementation | |
| TW201800744A (en) | Imaging device for inspecting defect, defect inspecting system, apparatus for manufacturing film, imaging method for inspecting defect, defect inspecting method, and method for manufacturing film | |
| CN104359429A (en) | Contact area measurement method and system based on image measuring technique | |
| CN102565069A (en) | Infrared microscopic non-destructive detector for integrated circuit | |
| CN203587517U (en) | Capturing device for capturing object image and image detection device | |
| KR101668039B1 (en) | Method for Light Test of Display Panel | |
| CN107231553A (en) | Corner location acquisition methods and device | |
| KR20100093213A (en) | System for inspecting defects on glass substrate using contrast value, and method of the same | |
| CN106197365A (en) | A kind of optical axis included angle detection method of multiple stage viewing field of camera splicing | |
| CN109444150A (en) | Contactless crackle measurement method and its device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20170222 Termination date: 20171208 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |