CN107131847A - A kind of measurement apparatus and method that can be applied to 3D bend glass surface testings - Google Patents
A kind of measurement apparatus and method that can be applied to 3D bend glass surface testings Download PDFInfo
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- CN107131847A CN107131847A CN201710452978.5A CN201710452978A CN107131847A CN 107131847 A CN107131847 A CN 107131847A CN 201710452978 A CN201710452978 A CN 201710452978A CN 107131847 A CN107131847 A CN 107131847A
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- 238000005259 measurement Methods 0.000 title claims abstract description 69
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- 238000000691 measurement method Methods 0.000 description 6
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- DWDGSKGGUZPXMQ-UHFFFAOYSA-N OPPO Chemical compound OPPO DWDGSKGGUZPXMQ-UHFFFAOYSA-N 0.000 description 1
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting
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Abstract
The invention discloses a kind of measurement apparatus and method that can be applied to 3D bend glass surface testings, including casing, liquid crystal LCD display screen, the left cameras of CCD, the right cameras of CCD, supporting mechanism and two-dimentional self-powered platform, two-dimentional self-powered platform is located at the lower section of the left cameras of CCD and the right cameras of CCD and is fixedly connected on the bottom surface of casing, and clamping has 3D bend glasses on two-dimentional self-powered platform.Its measuring principle step includes：1) digital phase-shifting technique method；2) phase unwrapping；3) waveform recovers to model with object dimensional, and measured piece surface face graphic data is finally restored through resolving.The present invention is used as area source using the display of projective structure light, with stronger practicality and versatility, it is easy to industrialization, measurement accuracy is high, the measurement of 3D bend glasses is applicable not only to, and the specular material of high reflection characteristic can be measured, the measuring method step is simple, it is easily operated, have the advantages that measurement dynamic range is big and strong antijamming capability.
Description
Technical field
3D bend glass surface testings are can be applied to the invention belongs to technical field of optical precision measurement, more particularly to one kind
Measurement apparatus and method.
Background technology
Samsung mobile phone takes the lead in substituting traditional metal chassis using mobile phone glass bonnet, wherein 3D bend glasses cover plate into
For a spotlight, the profile and outstanding feel of its high face value rapidly become the new lover of consumer, and are increasingly becoming domestic manufacturers
The focus competitively chased, as trend of the market, the brand manufacturers such as current Huawei, millet, OPPO, vivo, LeEco has also all adopted
Use glass cover-plate technique.
3D bend glasses are mainly used in the protecting screen and bonnet of smart terminal product, and tradition 2D or 2.5D glass phases
Than, the features such as 3D bend glasses have frivolous, transparent cleaning, anti-fingerprint, anti-dazzle, its appearance property is more novel, superior.
In terms of thermal diffusivity, glossiness and wearability advantageously, meanwhile, the design of bending and the radian of palm coordinate, and more conform to people
The requirement of body engineering science, can bring outstanding touch-control feel.Sustainable growth and electronics with smart terminal product markets
Consumption market is aesthetic to product appearance, the change of touch-control feel demand, and 3D bend glasses have the boundless market space.
The surface topography of 3D glass is measured exactly, particularly the measurement of 3D glass edges arc (R angles), not only
The change of 3D glass and defect in process can be correctly recognized, is easy to control and improve processing method, and for research table
The relation of face geometrical property and performance, significance is suffered from for the quality and properties of product for improving finished surface.Mesh
Before, for the detection of clear glass, detection method is few, and existing contact measurement method measuring speed is slow, easily scratch measurement
Surface, the distortion of data can be caused to complicated face shape part.The method of contactless minute surface detection mainly has profile measurement
Method, interferometer measurement method, the method such as three-dimensional coordinates measurement method, but there is the limitation of its own in these three methods.Profile is surveyed
It is low to there is sampling density in amount method, the shortcomings of detection used time is longer, it is impossible to meet engineering detecting demand；Interferometer measurement method, it is necessary to
Measured on one piece of reference mirror not less than tested component size, and the difficulty of processing of this high-precision reference mirror is big, system
Cause high, while need to design corresponding compensating element, and dynamic range is small；Three-dimensional coordinates measurement method precision is relatively low, during measurement
Between it is relatively long, be typically only used for rough detection-phase, measurement accuracy is limited.
The content of the invention
Present invention aims at can be applied to 3D there is provided one kind for the deficiency present in existing 3D glass detection technique
The measurement apparatus of bend glass surface testing and the technical scheme of method, its general principle are to utilize LCD projective structure light, are passed through
CCD camera is shot to 3D glass to be measured, the modulation image that structure light is formed after being reflected through object under test surface；Then pass through
Digital image correlation, phase unwrapping algorithm obtains the phase diagram of modulation image, and finds out the pixel coordinate and camera of screen
Pixel coordinate one-to-one relationship；The parameter of combining camera demarcation, by the distribution that the distribution shifts of phase are position coordinates, and will
Phase calibration information is corresponding with spatial positional information；Light three-dimensional deviation art technology is finally utilized, phase change amount is set up with treating
The slope distribution of the face shape gradient information of object, i.e. X and Y-direction is surveyed, 3 d shape can be realized along slope direction iterated integral
Reconstruction.The method is widely used and simple in construction, with low cost, it is easy to operated, and measurement dynamic range is big, and measurement is accurate
The advantages of degree height and strong antijamming capability.
In order to solve the above-mentioned technical problem, the present invention is adopted the following technical scheme that：
A kind of measurement apparatus that can be applied to 3D bend glass surface testings, it is characterised in that：Including casing, liquid crystal LCD
The left camera of indicator screen, CCD, the right cameras of CCD, supporting mechanism and two-dimentional self-powered platform, the left cameras of CCD and the right cameras of CCD
By supporting mechanism mobile link in the inside of casing, supporting mechanism includes horizontal guide and vertical guide rod, the inner side of casing
The first location-plate is provided with face, vertical guide rod is fixedly connected on the first location-plate by the first triangle joint block, and level is led
The two ends of bar connect vertical guide rod by rectangle contiguous block, and the left cameras of CCD and the equal mobile link of the right cameras of CCD are in horizontal guide
On, two-dimentional self-powered platform is located at the lower section of the left cameras of CCD and the right cameras of CCD and is fixedly connected on the bottom surface of casing, two dimension
Clamping has 3D bend glasses on self-powered platform；The structural light measurement device light source is by liquid crystal LCD display screen projective structure
Light, and as area source, it is radiated on 3D bend glasses at a certain angle, 3D bend glasses be placed on one can lift two
Tie up on self-powered platform, different visual angles adjusted to facilitate, two CCD cameras are mutually angled, by adjust CCD camera and
The position of workbench, makes structure light as much as possible be shown on tested 3D glass, and obtained by CCD camera.
Further, liquid crystal LCD display screen tilt be embedded on the medial surface of casing, liquid crystal LCD display screen with
Certain angle is tilted, and this design method can not only reduce the space occupancy rate to casing, and inclined polishing mode, more
Be conducive to project structured light to 3D glass edges, be easy to the measurement to edge R angles.
Further, horizontal guide is mutually perpendicular to vertical guide rod, can neatly front and rear regulation, it is convenient by the left cameras of CCD
With the right camera adjustments of CCD to suitable position, it is ensured that structured light projection as much as possible is to measured object surface when taking pictures, while can
To reduce the error of measurement, measurement accuracy is improved.
Further, the left cameras of CCD and the right cameras of CCD include the second triangle joint block and CCD camera, the second triangle joint
Positioning hole is provided with block, positioning hole matches with horizontal guide, is provided with the second triangle joint block in supporting plate, supporting plate
Be vertically connected with limiting plate, CCD camera clamping on limiting plate, CCD camera can in the presence of the second triangle joint block edge
Horizontal guide movement, the 3D bend glasses at diverse location and visual angle can be taken pictures, easy to use and flexible.
Further, two-dimentional self-powered platform includes being provided with height tune on workbench and base, the bottom surface of workbench
Mechanism is saved, is provided with and is parallel to each other and first support and second support arranged in a crossed manner, first between workbench and base
Frame is located at the inner side of second support, and the center of two first supports and two second supports is connected by connecting shaft, two the
It is fixedly connected between the bottom surface of one support between the bottom surface of two second supports by upper junction plate, two first supports
It is fixedly connected between top surface between the top surface of two second supports by lower connecting plate, passes through first support and second support
Design, improve stability of the workbench during moving up and down, upper junction plate and lower connecting plate not only increase
One support and the intensity of second support connection, prevent and rock, and reduce impact of the workbench during decline
Power.
Further, height adjustment mechanism includes handle and clamp nut, and handle connects the second location-plate by clamp nut,
Second location-plate is fixedly connected on the lower section of workbench, by rotate handle can adjustment work platform height and position, and
It can be positioned by trip bolt.
The measurement apparatus is a kind of test system that can be tested high reflecting mirror surface, with simple in construction, dynamic
Scope is big, accuracy of measurement is high, detection speed is fast, strong anti-interference performance, cost is low, it is easily operated the advantages of.
A kind of measuring method for the measurement apparatus that can be applied to 3D bend glass surface testings described above, it is characterised in that
Comprise the following steps：
1) digital phase-shifting technique method
In the measurement apparatus, projecting structural optical in lcd screen is irradiated to sample surface, is reflected into through mirror to be measured
Deforming stripe light intensity after camera imaging is described by following equation：
Wherein, a (x, y) is background luminous intensity；B (x, y) is Modulation and Amplitude Modulation；To need the phase distribution asked；I
(x, y) is the light intensity that CCD camera is detected；δ (t) is the additional phase shift changed over time, and the phase difference of adjacent phase shift figure isThe image collected is designated as I respectively1,I2,……In.Pass through phaseValue can be in the hope of CCD camera pixel
Corresponding LCD display pixel, according to least square method, the actual image I for collecting every widthpnWith other ideal images
InBetween poor quadratic sum minimalization
Its phase to be measured is：
2) phase unwrapping
For the phase unwrapping of the one-dimensional space, the process of Phase- un- wrapping is in the calculation to wrapped phase plus the whole of 2 π
Several times, its process determines the translation function p (i) of unknown 2 π integral multiples, when the interference pattern of record meets Nyquist criterion,
At least two pixels of each fringe period, the specific recursion of unpacking is carried out by following equation：
Unpacking process since wavefront close to some position at interference pattern center, it is whole to calculate to enter from inside to outside
OK, thus set Pstart=0；
3) waveform recovers to model with object dimensional, and measured piece surface face graphic data is finally restored through resolving
For phase shifting method, by the phase information of each sample point in surface, streak reflex method is passed through according to system geometrical relationship
General principle obtains the slope information of each point, passes through 3 d shape Integration reconstructions Process on Surface gradient [p (x, y), q (x, y)]
It is integrated, the face shape information of optical surface can be obtained, in the ideal case, trapezoidal integration is carried out to corrugated,
Z=∫ (gxdx+gydy) (5)
The 3D faces shape of glass surface can be recovered with iteration repeatedly by integrating.
The present invention is by adopting the above-described technical solution, have the advantages that：
1st, the measurement apparatus employs the display of projective structure light as area source, and 2 CCD cameras and some are auxiliary
Profile device is helped to constitute, hardware price is cheap, measurement process is convenient, with stronger practicality and versatility；
2nd, the measurement apparatus is simple in construction, it is easy to industrialization, and measurement accuracy is high, is applicable not only to the survey of 3D bend glasses
Amount, and the specular material for having high reflection characteristic can be measured；
3rd, the measuring process of the measuring method is simple, it is easy to operate, high with measurement accuracy, and measurement dynamic range is big and anti-
The advantages of interference performance is strong.
Brief description of the drawings
The invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 is measurement apparatus in a kind of measurement apparatus and method that can be applied to 3D bend glass surface testings of the present invention
Design sketch；
Fig. 2 is internal structure schematic diagram of the invention；
Fig. 3 is the partial enlarged drawing at I in Fig. 2；
Fig. 4 is the structural representation of the left cameras of CCD and the right cameras of CCD in the present invention；
Fig. 5 is Fig. 4 front view；
Fig. 6 is the structural representation of two-dimentional self-powered platform in the present invention；
Fig. 7 is the measurement procedure figure of the embodiment of the present invention；
Fig. 8 is the intensity map of measurement result of the present invention；
Fig. 9 is the curvature chart of measurement result of the present invention；
Figure 10 is the face shape graphics of measurement result of the present invention；
Figure 11 is the 2D profiles of measurement result of the present invention；
Figure 12 restores the schematic diagram of measurement for double camera in the present invention.
In figure：1- casings；2- liquid crystal LCD display screens；The left cameras of 3-CCD；The right cameras of 4-CCD；5- supporting mechanisms；6-
Two-dimentional self-powered platform；7-3D bend glasses；8- horizontal guides；The vertical guide rods of 9-；10- rectangle contiguous blocks；The triangles of 11- first connect
Connect block；The location-plates of 12- first；13- the second triangle joint blocks；14- supporting plates；15-CCD cameras；16- limiting plates；17- is positioned
Hole；18- workbenches；19- bases；20- first supports；21- second supports；22- upper junction plates；23- lower connecting plates；24- connects
Spindle；The location-plates of 25- second；26- handles；27- clamp nuts.
Embodiment
As shown in Figure 1 to 11, it is a kind of measurement apparatus that can be applied to 3D bend glass surface testings of the present invention, including
The left camera 3 of casing 1, liquid crystal LCD display screen 2, CCD, the right cameras 4 of CCD, supporting mechanism 5 and two-dimentional self-powered platform 6, liquid
Brilliant LCD display screen 2 is tilted and is embedded on the medial surface of casing 1, and liquid crystal LCD display screen 2 is inclined at an angle, this
The space occupancy rate to casing 1, and inclined polishing mode can not only be reduced by planting design method, be more beneficial for structure light throwing
3D glass edges are mapped to, are easy to the measurement to edge R angles.
The left cameras 3 of CCD and the right cameras 4 of CCD are by the mobile link of supporting mechanism 5 in the inside of casing 1, supporting mechanism 5
Including horizontal guide 8 and vertical guide rod 9, horizontal guide 8 is mutually perpendicular to vertical guide rod 9, can neatly front and rear regulation, convenience
The left cameras 3 of CCD and the right cameras 4 of CCD are adjusted into suitable position, it is ensured that structured light projection as much as possible is to tested when taking pictures
Thing surface, while the error of measurement can be reduced, improves and is provided with the first location-plate 12 on measurement accuracy, the medial surface of casing 1,
Vertical guide rod 9 is fixedly connected on the first location-plate 12 by the first triangle joint block 11, and the two ends of horizontal guide 8 pass through square
Shape contiguous block 10 connects vertical guide rod 9, and the left cameras 3 of CCD and the equal mobile link of the right cameras 4 of CCD are in horizontal guide 8, the left phases of CCD
Machine 3 and the right cameras 4 of CCD include being provided with positioning on the second triangle joint block 13 and CCD camera 15, the second triangle joint block 13
Hole 17, positioning hole 17 matches with horizontal guide 8, is provided with supporting plate 14, supporting plate 14 and hangs down on the second triangle joint block 13
Direct-connected to be connected to limiting plate 16, the clamping of CCD camera 15 is on limiting plate 16, and CCD camera 15 can be in the second triangle joint block 13
Effect lower edge horizontal guide 8 and moved, and the 3D bend glasses 7 at diverse location and visual angle can be taken pictures, spirit easy to use
It is living.
Two-dimentional self-powered platform 6 is located at the lower section of the left cameras 3 of CCD and the right cameras 4 of CCD and is fixedly connected on the bottom of casing 1
On face, clamping has 3D bend glasses 7 on two-dimentional self-powered platform 6, and two-dimentional self-powered platform 6 includes workbench 18 and base
19, height adjustment mechanism is provided with the bottom surface of workbench 18, is provided with and is parallel to each other between workbench 18 and base 19
And first support 20 and second support 21 arranged in a crossed manner, first support 20 is positioned at the inner side of second support 21, two first
The center of frame 20 and two second supports 21 is connected by connecting shaft 24, between the bottom surface of two first supports 20 and two the
It is fixedly connected between the bottom surface of two supports 21 by upper junction plate 22, with two second between the top surface of two first supports 20
It is fixedly connected, by the design of first support 20 and second support 21, is carried by lower connecting plate 23 between the top surface of support 21
High stability of the workbench 18 during moving up and down, upper junction plate 22 and lower connecting plate 23 not only increase first
The intensity that frame 20 and second support 21 are connected, prevents and rocks, and reduce the rushing during decline of workbench 18
Power is hit, height adjustment mechanism includes handle 26 and clamp nut 27, and handle 26 connects the second location-plate 25 by clamp nut 27,
Second location-plate 25 is fixedly connected on the lower section of workbench 18, by rotate handle 26 can adjustment work platform 18 height
Position, and can be positioned by trip bolt；The structural light measurement device light source is projected by liquid crystal LCD display screen 2
Structure light, and as area source, it is radiated on 3D bend glasses 7 at a certain angle, 3D bend glasses 7 are placed on one and can risen
On the two-dimentional self-powered platform 6 of drop, by two mutual angled CCD cameras 15, CCD camera 15 and work are adjusted respectively
The angle of platform, with different position and visual angle, makes structure light radiation as much as possible on 3D glass.
The measurement apparatus is a kind of test system that can be tested high reflecting mirror surface, with simple in construction, dynamic
Scope is big, accuracy of measurement is high, detection speed is fast, strong anti-interference performance, cost is low, it is easily operated the advantages of.
A kind of measuring method for the measurement apparatus that can be applied to 3D bend glass surface testings described above, including following step
Suddenly：
1) digital phase-shifting technique method
In the measurement apparatus, projecting structural optical in lcd screen is irradiated to sample surface, is reflected into through mirror to be measured
Deforming stripe light intensity after camera imaging is described by following equation：
Wherein, a (x, y) is background luminous intensity；B (x, y) is Modulation and Amplitude Modulation；To need the phase distribution asked；I
(x, y) is the light intensity that CCD camera 15 is detected；δ (t) is the additional phase shift changed over time, and the phase difference of adjacent phase shift figure isThe image collected is designated as I respectively1,I2,……In.Pass through phaseValue can be in the hope of the pixel of CCD camera 15
The corresponding LCD display pixel of point, according to least square method, the actual image I for collecting every widthpnWith other ideographs
As InBetween poor quadratic sum minimalization
Its phase to be measured is：
2) phase unwrapping
For the phase unwrapping of the one-dimensional space, the process of Phase- un- wrapping is in the calculation to wrapped phase plus the whole of 2 π
Several times, its process determines the translation function p (i) of unknown 2 π integral multiples, when the interference pattern of record meets Nyquist criterion,
At least two pixels of each fringe period, the specific recursion of unpacking is carried out by following equation：
Unpacking process since wavefront close to some position at interference pattern center, it is whole to calculate to enter from inside to outside
OK, thus set Pstart=0；
3) waveform recovers to model with object dimensional, and measured piece surface face graphic data is finally restored through resolving
For phase shifting method, by the phase information of each sample point in surface, streak reflex method is passed through according to system geometrical relationship
General principle obtains the slope information of each point, passes through 3 d shape Integration reconstructions Process on Surface gradient [p (x, y), q (x, y)]
It is integrated, the face shape information of optical surface can be obtained, in the ideal case, trapezoidal integration is carried out to corrugated,
Z=∫ (gxdx+gydy) (5)
The 3D faces shape of glass surface can be recovered with iteration repeatedly by integrating.
The measuring method is the photocentre with aperture camera according to the normal of minute surface sample point (or perhaps x, y to slope)
Coordinate, functional relation between the screen pixels point coordinates and minute surface sample point coordinate of measured lens surface sample point is lighted, again assumed that
Precognition face shape provides a preferable initial value, and the slope and face shape of tested minute surface are tried to achieve finally according to functional relation iteration,
Functional relation between them is represented with equation below (6)：
Wherein, xmAnd ymIt is the coordinate on surface to be measured, can be obtained from the dimensional measurement of measurement apparatus；xcameraAnd ycamera
It is the coordinate of CCD camera 15, can be obtained from the dimensional measurement of measurement apparatus；xscreenAnd yscreenIt is LCD display screen bright spot
Coordinate, can be calculated and obtained by digital image correlation and phase-unwrapping algorithm；zm2screenAnd zm2cameraIt is speculum and screen respectively
Z coordinate difference between curtain, speculum and CCD camera 15；dm2screenAnd dm2cameraIt is speculum and screen, speculum respectively
The distance between with CCD camera 15；zm2screen、zm2cameraAnd dm2cameraIt can be obtained from dimensional measurement and demarcation.
In formula (6), due to slope wx(xm,ym)、wy(xm,ym) it is surface face shape w (xm,ym) function, therefore meter
Need to provide a preferable initial value when calculating slope, can generally use a preferable surface face shape or other measurement sides
Method obtains face shape to provide a preferable primary face shape valuation, is designated as w0(xm,ym), by w0(xm,ym) replace in formula (6)
w(xm,ym) it just can obtain (xm,ym) place x, y is to slope data, then obtained face shape w will be calculated by slope1(xm,ym) replace
W (x in formula (6)m,ym), and then another group of slope is obtained, by that analogy, pass through slope calculations and the face shape of iterating.On
It is the method restored using one camera to state formula, but this measurement apparatus uses the measuring method of left and right double camera, two
One camera slope and face shape, the technology then merged by picture, successive ignition are iterated to calculate by the above method respectively until
Export entire surface shape.The scheme advantage that this list-double camera is combined is that visual field can be increased, that is, adds measurement range, and
And more complicated face shape can be measured.
For the measurement of 3 d shape, the measuring method restored using one camera, it is necessary first to determine a precognition face shape,
If precognition face shape and tested surface shape difference are larger, program convergence can be caused slowly, precision and the speed of service can be a greater impact,
Calibration process is higher to geometric calibration required precision simultaneously, and the measurement accuracy of the reference planes of selection can directly affect final
Measurement result.
The measuring method restored using double camera, measurement visual field is small, and its effective coverage measured is the public affairs of two viewing field of camera
Intersecting area, and because it is directly scanned to entire surface shape altogether, data volume is big, and program operation speed is slow, it is impossible to multiple
Beans flour noodle shape measures recovery.The three-dimensional deviation art of double camera is simply introduced below, as shown in figure 12.
Double camera measuring principle：Measured respectively using double camera, each pixel correspondence incident ray of camera is obtained after measurement
The particular location of direction and observation station on screen.However, for single camera, causing because height is uncertain true
The normal vector of reflecting surface can not be determined, but can calculate the corresponding normal vector of different height, the measuring method of two cameras
It is also based on this principle.Only in the plane of true altitude, the two normal vectors could be overlapped, by measuring different pixels point
Corresponding incident ray direction, can obtain the normal vector distribution in plane, you can obtain body surface slope distribution.
The problem of existing for such scheme, this programme proposes the list based on binocular vision and digital image correlation-bis-
The method that camera is combined.The elevation information of 20 points of intersecting area is gathered first with double camera, one is then fitted to
Primary face shape, as the reference plane of tested surface shape, then inputs as the primary face shape of one camera, enters line slope iterative calculation straight
To the 3 d shape information for exporting measured piece, such program operation speed is greatly improved.
The advantage for the method being combined using list-double camera：1st, measurement visual field is big；2nd, arithmetic speed is greatly improved；3rd, it is right
The calibration request of hardware is substantially reduced；4th, complicated face shape can be measured.
The operation principle of the present invention is as follows：
1) area source is served as using 32 cun of high brightness LCD screen display to use, and projective structure light；
2) structure light of area source projection, is radiated on 3D bend glasses, 3D bend glasses are placed on can at an angle
On the two-dimentional self-powered platform of lifting, area source is irradiated to after testee, in two CCD phases after being reflected through testee surface
It is imaged on machine, by adjusting workbench height, further adjusts the position of 3D glass and the position of CCD camera, left and right camera
Install at an angle respectively, by adjusting the position of CCD camera and workbench, make structure light as much as possible in tested 3D
Show, and obtained by CCD camera on glass；
3) modulation image that structure light is formed after being reflected through object under test surface, then by digital image correlation, phase
Unwrapping algorithm, obtains the phase diagram of modulation image, and the pixel coordinate for the pixel coordinate and camera for finding out screen is corresponded
Relation；The parameter of combining camera demarcation, by the distribution that the distribution shifts of phase are position coordinates, and by phase calibration information with it is empty
Between positional information correspondence；Light three-dimensional deviation art technology is finally utilized, phase change amount and the face shape gradient of object under test is set up
Information.
4) restored method being combined using list-double camera, can by known gradient information along slope direction iterated integral
To carry out Surface reconstruction, so that the face shape to 3D glass is recovered.
The specific embodiment of the present invention is these are only, but the technical characteristic of the present invention is not limited thereto.It is any with this hair
Based on bright, to realize essentially identical technique effect, made ground simple change, equivalent substitution or modification etc., all cover
Among protection scope of the present invention.
Claims (7)
1. a kind of measurement apparatus that can be applied to 3D bend glass surface testings, it is characterised in that：Show including casing, liquid crystal LCD
Show the left camera of device screen, CCD, the right cameras of CCD, supporting mechanism and two-dimentional self-powered platform, the left cameras of CCD and the CCD
Right camera is by the supporting mechanism mobile link in the inside of the casing, and the supporting mechanism includes horizontal guide and perpendicular
The first location-plate is provided with straight guide rod, the medial surface of the casing, the vertical guide rod is fixed by the first triangle joint block
It is connected on first location-plate, the two ends of the horizontal guide connect the vertical guide rod, institute by rectangle contiguous block
The left cameras of CCD and the equal mobile link of the right cameras of the CCD are stated in the horizontal guide, the two-dimentional self-powered platform is located at institute
State the lower section of the left cameras of CCD and the right cameras of the CCD and be fixedly connected on the bottom surface of the casing, the two-dimentional lifting work
Clamping has 3D bend glasses on platform.
2. a kind of measurement apparatus that can be applied to 3D bend glass surface testings according to claim 1, it is characterised in that：
The liquid crystal LCD display screen is tilted and is embedded on the medial surface of the casing.
3. a kind of measurement apparatus that can be applied to 3D bend glass surface testings according to claim 1, it is characterised in that：
The horizontal guide is mutually perpendicular to the vertical guide rod.
4. a kind of measurement apparatus that can be applied to 3D bend glass surface testings according to claim 1, it is characterised in that：
The left cameras of CCD and the right cameras of the CCD include the second triangle joint block and CCD camera, the second triangle joint block
On be provided with positioning hole, the positioning hole matches with the horizontal guide, and support is provided with the second triangle joint block
Limiting plate is vertically connected with plate, the supporting plate, the CCD camera clamping is on the limiting plate.
5. a kind of measurement apparatus that can be applied to 3D bend glass surface testings according to claim 1, it is characterised in that：
The two-dimentional self-powered platform includes being provided with height adjustment mechanism on workbench and base, the bottom surface of the workbench,
It is provided with and is parallel to each other and first support and second support arranged in a crossed manner between the workbench and the base, described
One support is located at the inner side of the second support, and the center of two first supports and two second supports passes through even
Spindle is connected, and upper junction plate is passed through between the bottom surface of two second supports between the bottom surface of two first supports
It is fixedly connected, lower connecting plate is passed through between the top surface of two second supports between the top surface of two first supports
It is fixedly connected.
6. a kind of measurement apparatus that can be applied to 3D bend glass surface testings according to claim 5, it is characterised in that：
The height adjustment mechanism includes handle and clamp nut, and the handle connects second positioning by the clamp nut
Plate, second location-plate is fixedly connected on the lower section of the workbench.
7. a kind of measuring method for the measurement apparatus that can be applied to 3D bend glass surface testings as claimed in claim 1, its
It is characterised by comprising the following steps：
1) digital phase-shifting technique method
In the measurement apparatus, projecting structural optical in lcd screen is irradiated to sample surface, and camera is reflected into through mirror to be measured
Deforming stripe light intensity after imaging is described by following equation：
Wherein, a (x, y) is background luminous intensity；B (x, y) is Modulation and Amplitude Modulation；To need the phase distribution asked；I (x, y) is
The light intensity that CCD camera is detected；δ (t) is the additional phase shift changed over time, and the phase difference of adjacent phase shift figure isGather
To image be designated as I respectively1,I2,……In.Pass through phaseValue can be in the hope of the corresponding LCD of CCD camera pixel
Pixels of display screen, according to least square method, the actual image I for collecting every widthpnWith other ideal images InBetween
The quadratic sum minimalization of difference
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For the phase unwrapping of the one-dimensional space, the process of Phase- un- wrapping is the integer for adding 2 π to wrapped phase in the calculation
Times, its process determines the translation function p (i) of unknown 2 π integral multiples, when the interference pattern of record meets Nyquist criterion, often
At least two pixels of individual fringe period, the specific recursion of unpacking is carried out by following equation：
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The phase information of each sample point in surface, believes according to the slope that system geometrical relationship obtains each point by streak reflex method general principle
Breath, is integrated by 3 d shape Integration reconstructions Process on Surface gradient [p (x, y), q (x, y)], obtains the face of optical surface
Shape information, trapezoidal integration is carried out to corrugated,
Z=∫ (gxdx+gydy) (5)
The 3D faces shape of glass surface is recovered with iteration repeatedly by integrating.
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| CN107741202A (en) * | 2017-11-17 | 2018-02-27 | 山东理工大学 | A kind of leaf springs of car camber detection means |
| CN108317967A (en) * | 2017-12-27 | 2018-07-24 | 山东省青岛第四十五中学（青岛工贸职业学校） | A kind of three-dimensional coordinate array sweeping measuring system and its application method |
| CN108627120A (en) * | 2018-05-23 | 2018-10-09 | 苏州凡目视觉科技有限公司 | A kind of 3D bend glasses testing agency |
| CN108645871A (en) * | 2018-05-15 | 2018-10-12 | 佛山市南海区广工大数控装备协同创新研究院 | A kind of 3D bend glass defect inspection methods based on streak reflex |
| CN108759718A (en) * | 2018-07-19 | 2018-11-06 | 宁波九纵智能科技有限公司 | A kind of high reflection curved surface three-dimensional shape measuring apparatus |
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| CN108317967B (en) * | 2017-12-27 | 2020-08-04 | 于振 | Three-dimensional coordinate combined scanning measurement system and use method thereof |
| CN108317967A (en) * | 2017-12-27 | 2018-07-24 | 山东省青岛第四十五中学（青岛工贸职业学校） | A kind of three-dimensional coordinate array sweeping measuring system and its application method |
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