CN104613922A - Object outline measurement system and method - Google Patents
Object outline measurement system and method Download PDFInfo
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- CN104613922A CN104613922A CN201510088953.2A CN201510088953A CN104613922A CN 104613922 A CN104613922 A CN 104613922A CN 201510088953 A CN201510088953 A CN 201510088953A CN 104613922 A CN104613922 A CN 104613922A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/20—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring contours or curvatures, e.g. determining profile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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Abstract
The invention discloses an object outline measurement system and method. The system comprises a control module, a displacement sensor module, an image module and a supporting module, wherein the supporting module is used for adjusting an image detection field; the displacement sensor module is fixed on the supporting module and is used for detecting displacement data of a plurality of measurement sampling points, located at the part outside the field, of a detected object, and transmitting the data to the control module; the image module is used for acquiring an image of a visible part in the view field of the detected object and a sensor deflection angle image, and transmitting the image to the control module; the control module is used for processing the acquired data to obtain deformation data and outline parameters of the detected object. A contact type measurement method and a non-contact type measurement method are combined; measurement point polar coordinates are formed by a measurement numerical value of the sensor and the sensor deflection angle image; the outline of the detected object is fitted by using polar coordinates data of the plurality of measurement points, so that the outline measurement of an elastic body in an image invalid region is realized.
Description
Technical field
The invention belongs to measurement application, be specifically related to a kind of measurement contour of object system and method.
Background technology
Traditional contour of object measures extracting method can be divided into two classes substantially: take Image detection as the contactless measurement of representative and take three coordinate measuring machine as the contact measurement method of representative.Contactless measurement refers to and carry out accurately measuring of profile under the prerequisite not contacting testee.Such as, image detection method is wherein the image data utilizing the mode such as visible ray or laser-induced fluorescence (LIF) to obtain testee, and then utilizes image processing techniques to extract the profile obtaining object; Contact measurement method is then need utilize instrument to body surface contact thus obtain its outline data, most is representational is three coordinate measuring machine, first the measurement of tested geometric element is converted into the measurement to some point set coordinate positions on these geometric elements by three coordinate measuring machine, after the coordinate position recording these points, again according to the spatial value of these points, after mathematical operation, try to achieve its size and Form and position error.
This two classes measuring method cuts both ways, and has all played important effect in fields of measurement.Wherein, contact measurement method has certain requirement for the key element such as surfaceness, Young modulus of testee, and contactless measurement, especially the mode such as image processing, then require light to arrive and do not penetrate the surface of testee.For the measurement of elastic body stress deformation profile in other media, as the profile of tire stress and deformation in muddy road, traditional measuring method all has some limitations.In addition, all there is problem with high costs in these two kinds of measuring methods, and it is a kind of waste for inferior grade precision measure.
Summary of the invention
The object of this invention is to provide a kind of new contour of object measuring system and method, contact measurement method combines with contactless measurement by measuring method of the present invention, proposes a kind of method can carrying out measurement in real time for the profile of elastic body in Image detection failed areas during stress deformation newly.
According to an aspect of the present invention, propose a kind of contour of object measuring system, this system comprises: control module, displacement sensor module, image module and supporting module, wherein:
Testee is in outside image field of detection at least partially;
Described supporting module is used for adjusting for image field of detection before image collection;
Institute's displacement sensor modules is fixed on described supporting module, for detecting the displacement data of the multiple measurement sampled points in the part that testee is in outside image field of detection, and sends to described control module to process the displacement data collected;
Described image module is positioned at the side of testee, be exposed to the image of the visible part in image field of detection and the sensor deflection angle image in deflection fixed point for testee described in Real-time Collection, and send to described control module to process the image collected;
Described control module is connected with institute's displacement sensor modules and image module, for controlling for institute's displacement sensor modules and image module, and processes the image data received, and obtains thermomechanical processing and the profile parameters of described testee.
Alternatively, described supporting module at least comprises bracing frame, wherein: described back up pad is fixed on fixed mesa, for fixing institute displacement sensor modules.
Alternatively, institute's displacement sensor modules comprises multiple displacement transducer.
Alternatively, institute's displacement sensors is stay-supported type displacement sensor, and the end winding support of the bracing wire of described stay-supported type displacement sensor is at testee on the multiple measurement sampled points in the part outside image field of detection.
Alternatively, described system also comprises multiple conduit, and described conduit is fixed on described supporting module, provides deflection point of fixity for the bracing wire of stretching out for described stay-supported type displacement sensor.
Alternatively, described image module at least comprises image capture device, storer and regulates fixed mechanism.
According to a further aspect in the invention, also propose a kind of contour of object measuring method, the method comprises the following steps:
Step 1, is placed in the side of testee by image module and displacement sensor module;
Step 2, utilizes image module Real-time Collection testee to be exposed to the image of the visible part in image field of detection, and the visible part image collected is sent to control module;
Step 3, institute's displacement sensor modules detection testee is in the displacement data of the multiple measurement sampled points in the part outside image field of detection, namely measures the pole footpath data of sampled point in local pole coordinate system, and sends it to control module;
Step 4, utilizes described image module to gather the image of multiple predetermined deflection fixed point sensor deflection, and deflection image is sent to control module;
Step 5, described control module carries out processing thermomechanical processing and the profile parameters of the object under test part obtaining being exposed in image field of detection for described visible part image, carry out processing thermomechanical processing and the profile parameters of the object under test part obtaining being in outside image field of detection for described deflection image.
Alternatively, institute's displacement sensor modules comprises multiple stay-supported type displacement sensor.
Alternatively, the process carried out for described visible part image includes but not limited to the rim detection of noise filtering, image binaryzation process, contour of object, obtain the profile parameters of the object under test part in image field of detection after treatment, contrast not profile parameters in the same time can obtain the thermomechanical processing that described object under test is in the outer part of image field of detection.
Alternatively, the object under test part obtaining being in outside image field of detection of thermomechanical processing and profile parameters carry out processing to(for) deflection image are further comprising the steps: step 51, obtain respectively with the polar angle data of multiple measurement sampled points in local pole coordinate system that each deflection point of fixity is initial point according to described deflection image, in conjunction with the pole footpath data of measurement sampled point in local pole coordinate system that described step 3 obtains, obtain the polar data that each measurement sampled point is initial point with each deflection point of fixity; Step 52, coordinate transform is carried out for described polar data, obtain the absolute change parameter that described testee is in the part outside image field of detection, therefrom extract and obtain thermomechanical processing and the profile parameters that described testee is in the part outside image field of detection.
Utilize technique scheme of the present invention, when testee invade light cannot through medium time, under the acting in conjunction of stay-supported type displacement sensor, conduit, camera, can obtain several measurement sampled point respectively with the polar data that multiple deflection point of fixity is true origin, and the locus deflecting point of fixity is known and fixing, so can infer and effectively simulate testee distortion in media as well and profile.And the object remainder be exposed in Image detection visual field, then directly can obtain its deformation and outline data by camera calibration.Therefore, present invention achieves the combination of contact type measurement and non-contact measurement, cost that can be lower obtains elastomeric deformation and outline data in Image detection failed areas.
Accompanying drawing explanation
Fig. 1 is the structural representation of contour of object measuring system according to an embodiment of the invention;
Fig. 2 is the process flow diagram of contour of object measuring method according to an embodiment of the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
According to an aspect of the present invention, propose a kind of contour of object measuring system, Fig. 1 is the structural representation of contour of object measuring system according to an embodiment of the invention, wherein, 1 is testee, and 2 is processor, 3 is back up pad, 4,5,6 is three stay-supported type displacement sensors, and 7 is conduit, the separatrix of 8 expression image field of detection, 9 is chamber wall, 10 represent Image detection failed areas, and as sand, muddy water, 11 is image module.As shown in Figure 1, described contour of object measuring system comprises: control module, displacement sensor module, image module and supporting module, wherein:
Testee 1 is in outside image field of detection at least partially, and such as a part for testee 1 is covered by barriers such as silts, and another part is then directly exposed in image field of detection;
Described supporting module at least comprises construction package such as bracing frame 3 grade, for adjusting for image field of detection before image collection, wherein:
Described back up pad 3 is fixed on ground or other fixed mesas, for fixing institute displacement sensor modules.
In an embodiment of the present invention, described supporting module also comprises shell, the displacement sensor modules for holding, and enters to prevent the impurity such as dust or mud mixture.
Institute's displacement sensor modules is fixed in the back up pad 3 of described supporting module, for detecting the displacement data of the multiple measurement sampled points in the part that testee 1 is in outside image field of detection, and described control module is sent to process the displacement data collected;
Wherein, institute's displacement sensor modules comprises multiple displacement transducer, and in an embodiment of the present invention, described multiple displacement transducer is installed in parallel.
Wherein, the quantity of described measurement sampled point is corresponding with the quantity of institute's displacement sensors, in fact, the quantity of institute's displacement sensors is more, and measure sampled point more intensive, the measurement of outline data is more accurate, therefore, in actual applications, the quantity of institute's displacement sensors can carry out increase and decrease adjustment according to the complexity of the requirement of Surveying Actual Precision and testee profile, and the present invention is not limited in any way it.
Wherein, the fixed form of institute's displacement sensor modules in described back up pad 3 can be splicing, riveted joint; also can be threaded or other connected modes; the present invention is not restricted for concrete fixed form; should understand, all possible, rational by displacement sensor module, the fixed form of fixing on the supporting plate all falls within the scope of protection of the present invention.
Wherein, institute's displacement sensors be stay-supported type displacement sensor or other can be transformed into the displacement transducer of stay-supported type displacement sensor, such as rod-pulling type displacement transducer can obtain and structure like stay-supported sensor class through transformation, the shift value that described stay-supported type displacement sensor measurement obtains represents measures the pole footpath of sampled point in local pole coordinate system, the deflection angle of bracing wire represents measures the polar angle of sampled point in local pole coordinate system, under normal circumstances, the deflection angle of bracing wire is undertaken processing obtaining by for deflection angle image, according to measuring the footpath, pole and polar angle that obtain, local pole coordinate system can be set up, thus determine the point coordinate measuring sampled point.
When institute's displacement sensors is stay-supported type displacement sensor, described system also comprises multiple conduit 7, described conduit 7 is also fixed in described back up pad 3, bracing wire for stretching out for described stay-supported type displacement sensor provides deflection point of fixity, A, B, C as shown in Figure 13 point, the fulcrum that described deflection point of fixity deflects as displacement transducer bracing wire, also as the initial point of local pole coordinate system.Described stay-supported type displacement sensor (4,5,6) be drawstring through corresponding conduit 7 after, the end of bracing wire is separately fixed on the multiple measurement sampled points in part that testee 1 is in outside image field of detection, like this, the deformation that testee 1 is in the part outside image field of detection will cause bracing wire length and the change of bracing wire angle of stay-supported type displacement sensor.
Wherein, the quantity of described stay-supported type displacement sensor is corresponding to the quantity of described conduit, and the position that both are fixed in described back up pad 3 is also corresponding.
For convenience of description, hereinafter will be described for the present invention for stay-supported type displacement sensor.
Described image module is positioned at the side of testee 1, be exposed to image and the deflection angle image of sensor bracing wire at deflection point of fixity A, B, C place of the visible part in image field of detection for testee described in Real-time Collection 1, and send to described control module to process the image collected;
Wherein, described image module at least comprises the image capture device such as camera, video camera, storer and regulates fixed mechanism.Corresponding different measuring accuracy requirements, described camera can be high speed camera also can be general camera.Wherein, the electronic shutter of camera is connected with described control module, to realize the control for image acquisition.In addition, the view data of the image capture device such as camera, video camera collection can be deposited in storer therein, also can be sent in external memory storage by transmission interface and store.Described adjustment fixed mechanism is used for fixing described photographing module, and before measurement starts, adjust the angle of photography visual field.
Described control module is connected with institute's displacement sensor modules and image module, for controlling for institute's displacement sensor modules and image module, and the image data received is processed, obtain thermomechanical processing and the profile parameters of described testee 1.
As mentioned above, described image data at least comprises described visible part image, sensor bracing wire deflection angle image and displacement data.
Wherein, described control module at least comprises processor 2, multiple independently data acquisition channel and gauge tap, described processor 2 is for sending communication instruction, to control the displacement data collection of displacement transducer and the image acquisition of image module to institute's displacement sensor modules and image module; Described data acquisition channel is for transmitting image data; Described gauge tap is used for controlling according to the communication instruction of described processor 2 acquisition operations for institute's displacement sensor modules and image module.
According to a further aspect in the invention, also propose a kind of contour of object measuring method based on described contour of object measuring system, as shown in Figure 2, said method comprising the steps of:
Step 1, is placed in the side of testee 1 by image module and displacement sensor module;
Wherein, described image module and displacement sensor module are positioned at homonymy or the not homonymy of described testee 1, particularly, if described back up pad 3 is made up of transparent materials such as organic glass, then described image module and displacement sensor module are positioned at homonymy or the not homonymy of described testee 1; If but described back up pad 3 is made up of opaque material, then described image module and displacement sensor module must be positioned at the homonymy of described testee 1.
Wherein, institute's displacement sensor modules comprises multiple displacement transducer, and in an embodiment of the present invention, described multiple displacement transducer is installed in parallel.
Wherein, institute's displacement sensors be stay-supported type displacement sensor or other can be transformed into the displacement transducer of stay-supported type displacement sensor, such as rod-pulling type displacement transducer can obtain and structure like stay-supported sensor class through transformation.When institute's displacement sensors is stay-supported type displacement sensor, the end of the bracing wire of multiple stay-supported type displacement sensor is separately fixed on the multiple measurement sampled points in part that testee 1 is in outside image field of detection, wherein, the quantity of described measurement sampled point is corresponding with the quantity of described stay-supported type displacement sensor, in fact, the quantity of stay-supported type displacement sensor is more, and measure sampled point more intensive, the measurement of outline data is more accurate.Therefore, in actual applications, the quantity of institute's displacement sensors can carry out increase and decrease adjustment according to the complexity of the requirement of Surveying Actual Precision and testee profile, and the present invention is not limited in any way it.
Step 2, utilizes image module Real-time Collection testee 1 to be exposed to the image of the visible part in image field of detection, and the visible part image collected is sent to control module;
Step 3, institute's displacement sensor modules detection testee 1 is in the displacement data of the multiple measurement sampled points in the part outside image field of detection, namely measures the pole footpath data of sampled point in local pole coordinate system, and sends it to control module;
Step 4, utilizes described image module to gather the image of multiple predetermined deflection fixed point sensor bracing wire deflection, and bracing wire deflection image is sent to control module;
Wherein, the fulcrum that described deflection point of fixity deflects as displacement transducer bracing wire, also as the initial point of local pole coordinate system, namely the image gathering multiple deflection fixed point is the change in order to obtain stay-supported type displacement sensor bracing wire angle, the position (as shown in A, B, C in Fig. 1 3) that described deflection point of fixity can be taken as residing for conduit 7 also can be taken as other positions, as long as the position of this point is relatively fixing, have with reference to property.
Step 5, described control module carries out processing thermomechanical processing and the profile parameters of the object under test part obtaining being exposed in image field of detection for described visible part image, carry out processing thermomechanical processing and the profile parameters of the object under test part obtaining being in outside image field of detection for described bracing wire deflection image.
Wherein, the process carried out for described visible part image includes but not limited to the process such as rim detection of noise filtering, image binaryzation process, contour of object, can obtain the profile parameters of the object under test part in image field of detection after above-mentioned process, contrast not profile parameters in the same time can obtain the thermomechanical processing that described object under test is in the outer part of image field of detection.
Wherein, bracing wire deflection image is carried out processing the thermomechanical processing that obtains the object under test part be in outside image field of detection and profile parameters further comprising the steps:
Step 51, obtain respectively with the polar angle data of multiple measurement sampled points in local pole coordinate system that each deflection point of fixity is initial point according to described bracing wire deflection image, in conjunction with the pole footpath data of measurement sampled point in local pole coordinate system that described step 3 obtains, obtain the polar data that each measurement sampled point is initial point with each deflection point of fixity;
Wherein, can the deflection angle of detecting sensor bracing wire according to described bracing wire deflection image, namely measure the polar angle of sampled point in local pole coordinate system, this point belongs in prior art, repeats no more herein.
Step 52, coordinate transform is carried out for described polar data, obtain the absolute change parameter that described testee is in the part outside image field of detection, then therefrom extract and obtain thermomechanical processing and the profile parameters that described testee is in the part outside image field of detection.
Because the described locus of deflection point of fixity in absolute coordinate system is known and immobilize, thus coordinate transform is passed through, the local pole coordinate system transformation being initial point with each deflection point of fixity respectively can be fastened to the absolute coordinates taking same point as initial point, be about to measure the coordinate figure of sampled point in local pole coordinate system and be converted to the coordinate figure in absolute coordinate system, and then in absolute coordinate system, geometrical fit is carried out to the polar data of each measurement sampled point, such as mathematic curve matching, testee outline data in space and absolute variable element can be obtained, and then extract its thermomechanical processing being in the part outside image field of detection and profile parameters.Can find out from here, the magnitude setting of displacement transducer is more, and measure sampled point more intensive, the matching of data is more accurate.
To sum up, technique scheme of the present invention may be used for detecting the outline data of the testee be at least partially outside image field of detection, the outline data of the testee be all in outside image field of detection can certainly be detected, if the complete invaded image of testee detects failed areas, then directly can be obtained thermomechanical processing and the profile parameters of testee by above-mentioned polar data.In addition, technique scheme of the present invention can carry out profile measurement for the testee of the many materials of polymorphic type, both can be rigid body, also can be elastic body, such as rubber testee, irony testee, rigidity testee, elastic body testee etc.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a contour of object measuring system, is characterized in that, this system comprises: control module, displacement sensor module, image module and supporting module, wherein:
Testee is in outside image field of detection at least partially;
Described supporting module is used for adjusting for image field of detection before image collection;
Institute's displacement sensor modules is fixed on described supporting module, for detecting the displacement data of the multiple measurement sampled points in the part that testee is in outside image field of detection, and sends to described control module to process the displacement data collected;
Described image module is positioned at the side of testee, be exposed to the image of the visible part in image field of detection and the sensor deflection angle image in deflection fixed point for testee described in Real-time Collection, and send to described control module to process the image collected;
Described control module is connected with institute's displacement sensor modules and image module, for controlling for institute's displacement sensor modules and image module, and processes the image data received, and obtains thermomechanical processing and the profile parameters of described testee.
2. system according to claim 1, is characterized in that, described supporting module at least comprises bracing frame, wherein:
Described back up pad is fixed on fixed mesa, for fixing institute displacement sensor modules.
3. system according to claim 1, is characterized in that, institute's displacement sensor modules comprises multiple displacement transducer.
4. system according to claim 1, it is characterized in that, institute's displacement sensors is stay-supported type displacement sensor, and the end winding support of the bracing wire of described stay-supported type displacement sensor is at testee on the multiple measurement sampled points in the part outside image field of detection.
5. system according to claim 4, is characterized in that, described system also comprises multiple conduit, and described conduit is fixed on described supporting module, provides deflection point of fixity for the bracing wire of stretching out for described stay-supported type displacement sensor.
6. system according to claim 1, is characterized in that, described image module at least comprises image capture device, storer and regulates fixed mechanism.
7. a contour of object measuring method, is characterized in that, the method comprises the following steps:
Step 1, is placed in the side of testee by image module and displacement sensor module;
Step 2, utilizes image module Real-time Collection testee to be exposed to the image of the visible part in image field of detection, and the visible part image collected is sent to control module;
Step 3, institute's displacement sensor modules detection testee is in the displacement data of the multiple measurement sampled points in the part outside image field of detection, namely measures the pole footpath data of sampled point in local pole coordinate system, and sends it to control module;
Step 4, utilizes described image module to gather the image of multiple predetermined deflection fixed point sensor deflection, and deflection image is sent to control module;
Step 5, described control module carries out processing thermomechanical processing and the profile parameters of the object under test part obtaining being exposed in image field of detection for described visible part image, carry out processing thermomechanical processing and the profile parameters of the object under test part obtaining being in outside image field of detection for described deflection image.
8. method according to claim 7, is characterized in that, institute's displacement sensor modules comprises multiple stay-supported type displacement sensor.
9. method according to claim 7, it is characterized in that, the process carried out for described visible part image includes but not limited to the rim detection of noise filtering, image binaryzation process, contour of object, obtain the profile parameters of the object under test part in image field of detection after treatment, contrast not profile parameters in the same time can obtain the thermomechanical processing that described object under test is in the outer part of image field of detection.
10. method according to claim 7, is characterized in that, the object under test part obtaining being in outside image field of detection of thermomechanical processing and profile parameters carry out processing to(for) deflection image are further comprising the steps:
Step 51, obtain respectively with the polar angle data of multiple measurement sampled points in local pole coordinate system that each deflection point of fixity is initial point according to described deflection image, in conjunction with the pole footpath data of measurement sampled point in local pole coordinate system that described step 3 obtains, obtain the polar data that each measurement sampled point is initial point with each deflection point of fixity;
Step 52, coordinate transform is carried out for described polar data, obtain the absolute change parameter that described testee is in the part outside image field of detection, therefrom extract and obtain thermomechanical processing and the profile parameters that described testee is in the part outside image field of detection.
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