CN110415335A - A kind of three-dimensional rebuilding method and device - Google Patents
A kind of three-dimensional rebuilding method and device Download PDFInfo
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- CN110415335A CN110415335A CN201910594436.0A CN201910594436A CN110415335A CN 110415335 A CN110415335 A CN 110415335A CN 201910594436 A CN201910594436 A CN 201910594436A CN 110415335 A CN110415335 A CN 110415335A
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Abstract
The invention belongs to technical field of image processing, disclosing a kind of three-dimensional rebuilding method and device, method includes generating photoelasticity fringe pattern, and photoelasticity fringe pattern is projected respectively to reference planes, tested three-dimensional object surface；Acquisition obtains the structure light sequence pattern of reference planes, tested three-dimensional object surface respectively；The depth information that tested three-dimension object is obtained according to the structure light sequence pattern of reference planes, tested three-dimensional object surface establishes the threedimensional model of tested three-dimension object according to depth information.Device includes that photoelasticity fringe pattern generates projecting cell, image acquisition units, data processing unit.The present invention solves to be fixed using the equipment that grating encoding structure light carries out three-dimensional reconstruction in the prior art, the low problem of flexibility.
Description
Technical field
The present invention relates to technical field of image processing more particularly to a kind of three-dimensional rebuilding methods and device.
Background technique
Industrial development is one of the mark of state and society progress, and nowadays machine vision has become one in industrial production
The not retrievable demand of item, the innovative technique study especially rebuild to three-dimension object is also the one of field of machine vision
Item important research direction.Structural light three-dimensional measures the method that can be divided into point, line and coded structured light, and wherein coded structured light has
More wide visual field, advantage effective percentage is high, sampling density is big, strong timeliness and active are controlled etc..Structure light is to pass through
Point source of light is projected on object under test, obtains the depth data of scene to be measured, scanning needed for this method by point by point scanning
Time is longer；Line-structured light is the one linear structure light of projection into scene, only one-dimensional scanning need to be carried out, when shortening scanning
Between, but it is poor to the anti-interference ability of extraneous veiling glare；Coded structured light avoids length using two dimensional image as coding templet
Time sweep, can depth measurement with rapid time to object in entire scene, improve measurement efficiency.Utilize coded structured light
When carrying out three-dimensional measurement, it is only necessary to the coded image of setting be projected testee surface by projection arrangement, pass through acquisition
The distortion patterns of body surface can carry out three-dimensional reconstruction work, easy to operate, it is easy to accomplish.
The core work of coded structured light is the coding and decoding of projection pattern, is with traditional grating encoding structure light
Example, coded structured light method for generating pattern first is that directly projected to grating, this projecting method is thrown usually using number
Shadow instrument projects coding grating, needs to realize structured light projection by projector, that is, needs by Digital Image Processing skill
Art generates grating fringe pattern in a computer, then by projector to three-dimensional object surface.
Summary of the invention
The embodiment of the present application is solved and is compiled in the prior art using grating by providing a kind of three-dimensional rebuilding method and device
The equipment that code structure light carries out three-dimensional reconstruction is fixed, the low problem of flexibility.
The embodiment of the present application provides a kind of three-dimensional rebuilding method, comprising the following steps:
Step 1 generates photoelasticity fringe pattern, and the photoelasticity fringe pattern is projected respectively to reference planes, quilt
Survey three-dimensional object surface；
Step 2, acquisition obtains the structure light sequence pattern of the reference planes, the tested three-dimensional object surface respectively；
Step 3 obtains tested three according to the structure light sequence pattern of the reference planes, the tested three-dimensional object surface
The depth information for tieing up object establishes the threedimensional model of tested three-dimension object according to the depth information.
Preferably, include following sub-step in the step 1:
Elastooptic mateiral is placed on the articles holding table of photo-elastic instrument by step 1.1, and is applied to the elastooptic mateiral and carried
Lotus；
The rotation angle of polarizer is fixed as pi/2 by step 1.2, and the rotation angle of the first quarter wave plate is fixed as π/4,
(0, π/4), (0,3 π/4), (0,0), (π/4, π/4), (pi/2, pi/2), (3 are rotated to respectively in the second quarter wave plate and analyzer
π/4,3 π/4) configuration under generate six width photoelasticity fringe patterns；
Step 1.3 is projected respectively to described by photoelasticity fringe pattern described in six width of the point light source by generation with reference to flat
Face, the tested three-dimensional object surface.
Preferably, the step 1 includes following sub-step:
Step 1.1, by computer settings matrix parameter x, y and the value of underlying parameter D, t, F, P, according to following equation
Obtain the isoclinic angle value θ of diametral compression disk and the phase-delay value δ of diametral compression disk:
Wherein, σx、σyThe respectively value of first principal stress and second principal stress, τxyFor shear stress, x, y are respectively photoelasticity
Lateral resolution, the longitudinal resolution of bar graph, D are the diameter of elastooptic mateiral, and t is the thickness of elastooptic mateiral, and F is photoelastic
Property material photoelastic coefficient, P is the load that loads on elastooptic mateiral；
θ and δ are brought into following equation six width photoelasticity fringe patterns of acquisition by step 1.2:
Wherein, IiFor the light intensity value of the i-th width photoelasticity fringe pattern, i=1,2,3,4,5,6；IbFor background light intensity, I0For
Initial beam intensity；
Step 1.3 is projected respectively to described by photoelasticity fringe pattern described in six width of the projector by generation with reference to flat
Face, the tested three-dimensional object surface.
Preferably, in the step 3, including following sub-step:
Step 3.1, the first isodiff phase value, the tested three-dimensional object surface for obtaining each point in the reference planes
Second isodiff phase value of upper each point；
Step 3.2 obtains phase difference value according to the first isodiff phase value, the second isodiff phase value；
Step 3.3, the depth information that tested three-dimension object is obtained according to the phase difference value and triangulation equation.
Preferably, the calculation formula that the first isodiff phase value, the second isodiff phase value use are as follows:
Wherein, I 'iFor the light intensity value of the i-th width structure light sequence pattern, i=1,2,3,4,5,6；θ ' is isoclinic angle parameter,
δ ' is isodiff phase value, and the first isodiff phase value is denoted as δ 'A, the second isodiff phase value be δ 'B；
Wherein, l is distance of the image acquisition units to reference planes, and h is depth information, and d is image acquisition units to throwing
The distance of image device, k are scale factor, and Δ δ ' is phase difference value.
In addition, the embodiment of the present application also provides a kind of three-dimensional reconstruction apparatus, comprising: it is single that photoelasticity fringe pattern generates projection
Member, image acquisition units, data processing unit；
The photoelasticity fringe pattern generates projecting cell for generating photoelasticity fringe pattern, and by the photoelasticity item
Line pattern is projected respectively to reference planes, tested three-dimensional object surface；
Described image acquisition unit obtains the knot of the reference planes, the tested three-dimensional object surface for acquisition respectively
Structure light sequence pattern；
The data processing unit is used for the structure light sequence according to the reference planes, the tested three-dimensional object surface
Pattern obtains the depth information of tested three-dimension object, and the threedimensional model of tested three-dimension object is established according to the depth information.
Preferably, the photoelasticity fringe pattern generates projecting cell and uses photo-elastic instrument, the photo-elastic instrument include coaxially according to
Point light source, polarizer, the first quarter wave plate, the second quarter wave plate, analyzer of secondary setting；
Elastooptic mateiral is placed on the articles holding table of the photo-elastic instrument, and the elastooptic mateiral is located at the one 1/4 wave
Between piece, second quarter wave plate；
The elastooptic mateiral is applied load, and the rotation angle of the polarizer is fixed as pi/2, the one 1/4 wave
The rotation angle of piece is fixed as π/4, second quarter wave plate and the analyzer rotate to respectively (0, π/4), (0,3 π/4),
(0,0), (π/4, π/4), (pi/2, pi/2), (3 π/4,3 π/4), the point light source divide six width photoelasticity fringe patterns of generation
It Tou Ying not be to the reference planes, the tested three-dimensional object surface.
Preferably, the photoelasticity fringe pattern generates projecting cell and uses computer and projector, and the computer is used
In generating photoelasticity fringe pattern, the projector is for projecting the photoelasticity fringe pattern respectively to reference planes, quilt
Survey three-dimensional object surface；
The computer is used to set the value of matrix parameter x, y and underlying parameter D, t, F, P, and is obtained according to following equation
Obtain the isoclinic angle value θ of diametral compression disk and the phase-delay value δ of diametral compression disk:
Wherein, σx、σyThe respectively value of first principal stress and second principal stress, τxyFor shear stress, x, y are respectively photoelasticity
Lateral resolution, the longitudinal resolution of bar graph, D are the diameter of elastooptic mateiral, and t is the thickness of elastooptic mateiral, and F is photoelastic
Property material photoelastic coefficient, P be load load；
The computer, which is used to bringing θ and δ into following equation into, obtains six width photoelasticity fringe patterns:
Wherein, IiFor the light intensity value of the i-th width photoelasticity fringe pattern, i=1,2,3,4,5,6；IbFor background light intensity, I0For
Initial beam intensity.
Preferably, the data processing unit be used for obtain each point in the reference planes the first isodiff phase value,
Second isodiff phase value of each point on the tested three-dimensional object surface, for according to the first isodiff phase value, institute
It states the second isodiff phase value and obtains phase difference value；For obtaining tested three-dimensional according to the phase difference value and triangulation equation
The depth information of object.
Preferably, the calculation formula that the first isodiff phase value, the second isodiff phase value use are as follows:
Wherein, I 'iFor the light intensity value of the i-th width structure light sequence pattern, i=1,2,3,4,5,6；θ ' is isoclinic angle parameter,
δ ' is isodiff phase value, and the first isodiff phase value is denoted as δ 'A, the second isodiff phase value be δ 'B；
Wherein, l is distance of the image acquisition units to reference planes, and h is depth information, and d is image acquisition units to throwing
The distance of image device, k are scale factor, and Δ δ ' is phase difference value.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
In the embodiment of the present application, arbitrary three-dimensional article body surface is projected on using photoelasticity fringe pattern as structured light patterns
Face is decoded realization to the pattern of acquisition by the data processing unit connecting with image acquisition units and builds in Virtual Space
The threedimensional model of vertical object.The present invention uses photoelasticity fringe pattern as new structure striations pattern, by photoelasticity fringe
Analytical technology, triangulation technique are applied in three-dimensional reconstruction field, can overcome and carry out three-dimensional using grating encoding structure light
The equipment of reconstruction is fixed, the low problem of flexibility, and making projector no longer is the fixed selection of realization three-dimensional reconstruction, but in device
On photo-elastic instrument not only can be used but also can be used computer and projector combination unit, selection flexibly, application range is wider.
Detailed description of the invention
It, below will be to needed in embodiment description in order to illustrate more clearly of the technical solution in the present embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is one embodiment of the present of invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram for three-dimensional reconstruction apparatus that the embodiment of the present invention 1 provides；
The rotation angle table of photo-elastic instrument in a kind of three-dimensional rebuilding method that Fig. 2 provides for the embodiment of the present invention 1；
The photoelasticity fringe pattern generated in a kind of three-dimensional rebuilding method that Fig. 3 provides for the embodiment of the present invention 2；
Fig. 4 is a kind of structural schematic diagram for three-dimensional reconstruction apparatus that the embodiment of the present invention 2 provides；
Fig. 5 is the schematic illustration of the embodiment of the present invention 1, the measurement of 2 intermediate cam of embodiment.
Wherein, 11- point light source, 12- polarizer, the first quarter wave plate of 13-, 14- elastooptic mateiral, the second quarter wave plate of 15-,
16- analyzer, 17- image collecting device, 18- data processing unit, 19- reference planes；
41- projector, 42- image collecting device, 43- data processing unit, 44- reference planes；
61- three-dimensional object surface, 62- projection arrangement, 63- image collecting device, 64- reference planes.
Specific embodiment
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
The present embodiment provides a kind of three-dimensional rebuilding methods, mainly comprise the steps that
Step 1 generates photoelasticity fringe pattern, and the photoelasticity fringe pattern is projected respectively to reference planes, quilt
Survey three-dimensional object surface；
Step 2, acquisition obtains the structure light sequence pattern of the reference planes, the tested three-dimensional object surface respectively；
Step 3 obtains tested three according to the structure light sequence pattern of the reference planes, the tested three-dimensional object surface
The depth information for tieing up object establishes the threedimensional model of tested three-dimension object according to the depth information.
Correspondingly, the present embodiment also provides a kind of three-dimensional reconstruction apparatus, comprising: it is single that photoelasticity fringe pattern generates projection
Member, image acquisition units, data processing unit.
The photoelasticity fringe pattern generates projecting cell for generating photoelasticity fringe pattern, and by the photoelasticity item
Line pattern is projected respectively to reference planes, tested three-dimensional object surface；Described image acquisition unit obtains institute for acquisition respectively
State the structure light sequence pattern of reference planes, the tested three-dimensional object surface；The data processing unit is used for according to
The structure light sequence pattern acquisition of reference planes, the tested three-dimensional object surface is tested the depth information of three-dimension object, according to
The depth information establishes the threedimensional model of tested three-dimension object.
The present invention using photoelasticity fringe pattern as new structure striations pattern, by photoelasticity fringe analytical technology,
Triangulation technique is applied in three-dimensional reconstruction field, can overcome the equipment for carrying out three-dimensional reconstruction using grating encoding structure light
It is fixed, the low disadvantage of flexibility.
The present invention is described further below.
Embodiment 1:
Use transmission-type photo-elastic instrument as structure light sequence generating device, as shown in fig. 1, selects monochromatic point light source 11
The light source of (green point light source can be used) as photo-elastic instrument；Select transparent elastooptic mateiral 14 (usable polycarbonate disc)
It is placed on the articles holding table of photo-elastic instrument, and applies certain load by the device of loaded load；According to the table number in Fig. 2
According to the position that polarizer 12 and the first quarter wave plate 13 is fixed, and rotate the position of the second quarter wave plate 15 and analyzer 16；
It is acted on by the projection of point light source 11, by elastooptic mateiral 14, generated photoelasticity fringe pattern is projected in circularly polarized light field
In reference planes 19 (hereinafter referred to as plane P) and tested three-dimensional object surface S (hereinafter referred to as surface S)；With data processing list
Image acquisition units 17 (camera can be used) the difference acquired projections that first 18 (computer can be used) are connected are in plane P and table
Photoelasticity fringe sequence pattern on the S of face；Each point isodiff phase value on plane P and surface S is calculated separately, can then be calculated
Phase difference value out；The depth information that body surface is calculated according to principle of triangulation, can be obtained tested three-dimensional object surface
Depth information.
Specifically, embodiment 1 provide three-dimensional rebuilding method the following steps are included:
Step 1 generates photoelasticity fringe pattern, and the photoelasticity fringe pattern is projected respectively to reference planes, quilt
Survey three-dimensional object surface.
Elastooptic mateiral is placed on the articles holding table of photo-elastic instrument by step 1.1, and is applied to the elastooptic mateiral and carried
Lotus.
The rotation angle of polarizer is fixed as pi/2 by step 1.2, and the rotation angle of the first quarter wave plate is fixed as π/4,
(0, π/4), (0,3 π/4), (0,0), (π/4, π/4), (pi/2, pi/2), (3 are rotated to respectively in the second quarter wave plate and analyzer
π/4,3 π/4) configuration under generate six width photoelasticity fringe patterns.
Step 1.3 is projected respectively to described by photoelasticity fringe pattern described in six width of the point light source by generation with reference to flat
Face, the tested three-dimensional object surface.
Step 2, acquisition obtains the structure light sequence pattern of the reference planes, the tested three-dimensional object surface respectively.
Camera specifically can be used and obtain structure light sequence pattern.
Step 3 obtains tested three according to the structure light sequence pattern of the reference planes, the tested three-dimensional object surface
The depth information for tieing up object establishes the threedimensional model of tested three-dimension object according to the depth information.
Step 3.1, the first isodiff phase value, the tested three-dimensional object surface for obtaining each point in the reference planes
Second isodiff phase value of upper each point.
Step 3.2 obtains phase difference value according to the first isodiff phase value, the second isodiff phase value.
Step 3.3, the depth information that tested three-dimension object is obtained according to the phase difference value and triangulation equation.
Wherein, the calculation formula that the first isodiff phase value, the second isodiff phase value use are as follows:
Wherein, I 'iFor the light intensity value of the i-th width structure light sequence pattern, i=1,2,3,4,5,6；θ ' is isoclinic angle parameter,
δ ' is isodiff phase value, and the first isodiff phase value is denoted as δ 'A, the second isodiff phase value be δ 'B；
Wherein, l is distance of the image acquisition units to reference planes, and h is depth information, and d is image acquisition units to throwing
The distance of image device, k are scale factor, represent the mapping relations of unit of phase difference and actual range；Δ δ ' is phase difference value.
As shown in figure 5, there is no three-dimension object when, projection arrangement 62 projects structured light patterns to reference planes
64, A, the phase value of B two o'clock is respectively δ 'AWith δ 'B, it is assumed that the position that pixel coordinate of the A point in image collecting device 63 is fastened
For A '；After placing three-dimension object, projection arrangement 62 projects structured light patterns to three-dimensional object surface 61, due to three-dimensional article
The high modulation of body, the position of pixel coordinate system A ' will collected O point phase, according to relationship in Fig. 5 it is found that δ 'O=
δ′B, i.e., the phase value of A ' due to O point high modulation and from δ 'ABecome δ 'B, therefore phase difference δ ' and the O point of A, B point-to-point transmission
Depth information should have the relationship of formula (1-3).
The device that embodiment 1 uses includes that photoelasticity fringe pattern generates projecting cell (specifically using photo-elastic instrument), image
Acquisition unit, data processing unit, for realizing the above method.
Embodiment 1 can get rid of the limitation of projector, and making projector no longer is a kind of necessity.Embodiment 1 is opened photoelastic
The light source of instrument, elastooptic mateiral is placed on the articles holding table of photo-elastic instrument, and applying suitable Arbitrary Loads can be by structure
Light pattern (photoelasticity fringe pattern) is projected on coding and the projection that structured light patterns are completed on three-dimension object, and operation is very just
Benefit.
Embodiment 2:
Embodiment 2 as shown in figure 4, by using computer generate photoelasticity fringe pattern, will be photoelastic using projector 41
Property candy strip (by photoelasticity acquired in photo-elastic instrument in the photoelasticity fringe pattern and embodiment 1 generated by this method
Candy strip is identical) successively it is projected on reference planes 44 (hereinafter referred to as plane P) and tested three-dimensional object surface S (hereinafter referred to as
For surface S)；The image acquisition units 42 (camera can be used) being connected with data processing unit 43 (computer can be used) point
Other acquired projections are in the photoelasticity fringe sequence pattern on plane P and surface S；Calculate separately each point equal difference on plane P and surface S
Phase of line value can then calculate phase difference value；The depth information that body surface is calculated according to principle of triangulation, can obtain
The depth information of three-dimensional object surface must be tested.
Specifically, embodiment 2 provide three-dimensional rebuilding method the following steps are included:
Step 1 generates photoelasticity fringe pattern, and the photoelasticity fringe pattern is projected respectively to reference planes, quilt
Survey three-dimensional object surface.
Step 1.1, by computer settings matrix parameter x, y and the value of underlying parameter D, t, F, P, according to following equation
Obtain the isoclinic angle value θ of diametral compression disk and the phase-delay value δ of diametral compression disk:
Wherein, σx、σyThe respectively value of first principal stress and second principal stress, τxyFor shear stress, x, y are respectively photoelasticity
Lateral resolution, the longitudinal resolution of bar graph, D are the diameter of elastooptic mateiral, and t is the thickness of elastooptic mateiral, and F is photoelastic
Property material photoelastic coefficient, P is the load that loads on elastooptic mateiral.
θ and δ are brought into following equation six width photoelasticity fringe patterns of acquisition by step 1.2:
Wherein, IiFor the light intensity value of the i-th width photoelasticity fringe pattern, i=1,2,3,4,5,6；IbFor background light intensity, I0For
Initial beam intensity.The photoelasticity fringe pattern of generation is as shown in Figure 3.
Step 1.3 is projected respectively to described by photoelasticity fringe pattern described in six width of the projector by generation with reference to flat
Face, the tested three-dimensional object surface.
Step 2, acquisition obtains the structure light sequence pattern of the reference planes, the tested three-dimensional object surface respectively.
Camera specifically can be used and obtain structure light sequence pattern.
Step 3 obtains tested three according to the structure light sequence pattern of the reference planes, the tested three-dimensional object surface
The depth information for tieing up object establishes the threedimensional model of tested three-dimension object according to the depth information.
Step 3.1, the first isodiff phase value, the tested three-dimensional object surface for obtaining each point in the reference planes
Second isodiff phase value of upper each point.
Step 3.2 obtains phase difference value according to the first isodiff phase value, the second isodiff phase value.
Step 3.3, the depth information that tested three-dimension object is obtained according to the phase difference value and triangulation equation.
Wherein, the calculation formula that the first isodiff phase value, the second isodiff phase value use are as follows:
Wherein, I 'iFor the light intensity value of the i-th width structure light sequence pattern, i=1,2,3,4,5,6；θ ' is isoclinic angle parameter,
δ ' is isodiff phase value, and the first isodiff phase value is denoted as δ 'A, the second isodiff phase value be δ 'B；
Wherein, l is distance of the image acquisition units to reference planes, and h is depth information, and d is image acquisition units to throwing
The distance of image device, k are scale factor, and Δ δ ' is phase difference value.
As shown in figure 5, there is no three-dimension object when, projection arrangement 62 projects structured light patterns to reference planes
64, A, the phase value of B two o'clock is respectively δ 'AWith δ 'B, it is assumed that the position that pixel coordinate of the A point in image collecting device 63 is fastened
For A '；After placing three-dimension object, projection arrangement 62 projects structured light patterns to three-dimensional object surface 61, due to three-dimensional article
The high modulation of body, the position of pixel coordinate system A ' will collected O point phase, according to relationship in Fig. 5 it is found that δ 'O=
δ′B, i.e., the phase value of A ' due to O point high modulation and from δ 'ABecome δ 'B, therefore phase difference δ ' and the O point of A, B point-to-point transmission
Depth information should have the relationship of formula (2-14).
The device that embodiment 2 uses includes that photoelasticity fringe pattern generates projecting cell (specifically using computer and projection
Instrument), image acquisition units, data processing unit, for realizing the above method.
Structured light patterns used by embodiment 2 are photoelasticity fringe patterns, and photoelasticity fringe pattern is by above
What formula and digital image processing techniques generated, the pattern that the projector in embodiment 2 goes out is different from traditional gratings strips
Line pattern and any one structured light patterns, and the device used is simple, cost is relatively low.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (10)
1. a kind of three-dimensional rebuilding method, which comprises the following steps:
Step 1 generates photoelasticity fringe pattern, and the photoelasticity fringe pattern is projected respectively to reference planes, tested three
Tie up body surface；
Step 2, acquisition obtains the structure light sequence pattern of the reference planes, the tested three-dimensional object surface respectively；
Step 3 obtains tested three-dimensional article according to the structure light sequence pattern of the reference planes, the tested three-dimensional object surface
The depth information of body establishes the threedimensional model of tested three-dimension object according to the depth information.
2. three-dimensional rebuilding method according to claim 1, which is characterized in that include following sub-step in the step 1:
Elastooptic mateiral is placed on the articles holding table of photo-elastic instrument by step 1.1, and applies load to the elastooptic mateiral；
The rotation angle of polarizer is fixed as pi/2 by step 1.2, and the rotation angle of the first quarter wave plate is fixed as π/4,
Two quarter wave plates and analyzer rotate to respectively (0, π/4), (0,3 π/4), (0,0), (π/4, π/4), (pi/2, pi/2), (3 π/4,3
π/4) configuration under generate six width photoelasticity fringe patterns；
Step 1.3 is projected respectively by photoelasticity fringe pattern described in six width of the point light source by generation to the reference planes, institute
State tested three-dimensional object surface.
3. three-dimensional rebuilding method according to claim 1, which is characterized in that the step 1 includes following sub-step:
Step 1.1, by computer settings matrix parameter x, y and the value of underlying parameter D, t, F, P, obtained according to following equation
The isoclinic angle value θ of the diametral compression disk and phase-delay value δ of diametral compression disk:
Wherein, σx、σyThe respectively value of first principal stress and second principal stress, τxyFor shear stress, x, y are respectively photoelasticity fringe
Lateral resolution, the longitudinal resolution of figure, D are the diameter of elastooptic mateiral, and t is the thickness of elastooptic mateiral, and F is photoelasticity material
The photoelastic coefficient of material, P are the load loaded on elastooptic mateiral；
θ and δ are brought into following equation six width photoelasticity fringe patterns of acquisition by step 1.2:
Wherein, IiFor the light intensity value of the i-th width photoelasticity fringe pattern, i=1,2,3,4,5,6；IbFor background light intensity, I0It is initial
Light intensity；
Step 1.3 is projected respectively by photoelasticity fringe pattern described in six width of the projector by generation to the reference planes, institute
State tested three-dimensional object surface.
4. three-dimensional rebuilding method according to claim 2 or 3, which is characterized in that in the step 3, including following sub-step
It is rapid:
Step 3.1 obtains the first isodiff phase value of each point in the reference planes, is each on the tested three-dimensional object surface
Second isodiff phase value of point；
Step 3.2 obtains phase difference value according to the first isodiff phase value, the second isodiff phase value；
Step 3.3, the depth information that tested three-dimension object is obtained according to the phase difference value and triangulation equation.
5. three-dimensional rebuilding method according to claim 4, which is characterized in that the first isodiff phase value, described
The calculation formula that two equal difference phase of line values use are as follows:
Wherein, I 'iFor the light intensity value of the i-th width structure light sequence pattern, i=1,2,3,4,5,6；θ ' be isoclinic angle parameter, δ ' be etc.
Poor phase of line value, the first isodiff phase value are denoted as δ 'AA, the second isodiff phase value be δ 'B；
Wherein, l is distance of the image acquisition units to reference planes, and h is depth information, and d is that image acquisition units are filled to projection
The distance set, k are scale factor, and Δ δ ' is phase difference value.
6. a kind of three-dimensional reconstruction system characterized by comprising photoelasticity fringe pattern generates projecting cell, Image Acquisition list
Member, data processing unit；
The photoelasticity fringe pattern generates projecting cell for generating photoelasticity fringe pattern, and by the photoelastic fringe pattern
Case is projected respectively to reference planes, tested three-dimensional object surface；
Described image acquisition unit obtains the reference planes, the structure light of the tested three-dimensional object surface for acquisition respectively
Sequence pattern；
The data processing unit is used for the structure light sequence pattern according to the reference planes, the tested three-dimensional object surface
The depth information for obtaining tested three-dimension object establishes the threedimensional model of tested three-dimension object according to the depth information.
7. three-dimensional reconstruction system according to claim 6, which is characterized in that it is single that the photoelasticity fringe pattern generates projection
Member uses photo-elastic instrument, and the photo-elastic instrument includes the point light source coaxially set gradually, polarizer, the first quarter wave plate, the 2nd 1/4 wave
Piece, analyzer；
Elastooptic mateiral is placed on the articles holding table of the photo-elastic instrument, and the elastooptic mateiral is located at first quarter wave plate, institute
It states between the second quarter wave plate；
The elastooptic mateiral is applied load, and the rotation angle of the polarizer is fixed as pi/2, first quarter wave plate
Rotation angle is fixed as π/4, second quarter wave plate and the analyzer rotate to respectively (0, π/4), (0,3 π/4), (0,
0), (π/4, π/4), (pi/2, pi/2), (3 π/4,3 π/4), the point light source throw six width photoelasticity fringe patterns of generation respectively
Shadow is to the reference planes, the tested three-dimensional object surface.
8. three-dimensional reconstruction system according to claim 6, which is characterized in that it is single that the photoelasticity fringe pattern generates projection
Member uses computer and projector, and the computer is used for for generating photoelasticity fringe pattern, the projector by the light
Elastic candy strip is projected respectively to reference planes, tested three-dimensional object surface；
The computer is used to set the value of matrix parameter x, y and underlying parameter D, t, F, P, and according to following equation acquisition pair
Diameter compresses the isoclinic angle value θ of disk and the phase-delay value δ of diametral compression disk:
Wherein, σx、σyThe respectively value of first principal stress and second principal stress, τxyFor shear stress, x, y are respectively photoelasticity fringe
Lateral resolution, the longitudinal resolution of figure, D are the diameter of elastooptic mateiral, and t is the thickness of elastooptic mateiral, and F is photoelasticity material
The photoelastic coefficient of material, P are the load of load；
The computer, which is used to bringing θ and δ into following equation into, obtains six width photoelasticity fringe patterns:
Wherein, IiFor the light intensity value of the i-th width photoelasticity fringe pattern, i=1,2,3,4,5,6；IbFor background light intensity, I0It is initial
Light intensity.
9. three-dimensional reconstruction system according to claim 6, which is characterized in that the data processing unit is described for obtaining
First isodiff phase value of each point in reference planes, on the tested three-dimensional object surface each point the second equal difference phase of line
Value, for obtaining phase difference value according to the first isodiff phase value, the second isodiff phase value；For according to
Phase difference value and triangulation equation obtain the depth information of tested three-dimension object.
10. three-dimensional reconstruction system according to claim 9, which is characterized in that the first isodiff phase value, described
The calculation formula that two equal difference phase of line values use are as follows:
Wherein, I 'iFor the light intensity value of the i-th width structure light sequence pattern, i=1,2,3,4,5,6；θ ' be isoclinic angle parameter, δ ' be etc.
Poor phase of line value, the first isodiff phase value are denoted as δ 'AA, the second isodiff phase value be δ 'B；
Wherein, l is distance of the image acquisition units to reference planes, and h is depth information, and d is that image acquisition units are filled to projection
The distance set, k are scale factor, and Δ δ ' is phase difference value.
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