CN106878692A - A kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum - Google Patents
A kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum Download PDFInfo
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- CN106878692A CN106878692A CN201710025183.6A CN201710025183A CN106878692A CN 106878692 A CN106878692 A CN 106878692A CN 201710025183 A CN201710025183 A CN 201710025183A CN 106878692 A CN106878692 A CN 106878692A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000001228 spectrum Methods 0.000 title claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000003384 imaging method Methods 0.000 claims abstract description 12
- 230000010354 integration Effects 0.000 claims abstract description 11
- 239000011159 matrix material Substances 0.000 claims description 14
- 238000002310 reflectometry Methods 0.000 claims description 4
- 230000008030 elimination Effects 0.000 claims description 3
- 238000003379 elimination reaction Methods 0.000 claims description 3
- 230000010363 phase shift Effects 0.000 claims description 3
- 238000009877 rendering Methods 0.000 claims description 2
- 238000004422 calculation algorithm Methods 0.000 abstract description 4
- 238000010191 image analysis Methods 0.000 abstract description 4
- 238000003491 array Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007620 mathematical function Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 239000005338 frosted glass Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/3147—Multi-projection systems
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- G06T3/16—
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- G06T5/80—
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/20—Image signal generators
- H04N13/275—Image signal generators from 3D object models, e.g. computer-generated stereoscopic image signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/363—Image reproducers using image projection screens
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
Abstract
The invention discloses a kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum, it includes two processes of the map generalization of unobstructed rectangular projection parallax and the reconstruction of 3-D view.The method is a series of with the raster graphic for determining function representation to three-dimensional scene projection using projector array, unobstructed rectangular projection anaglyph is recovered by building image analysis algorithm for reconstructing, and then shown using integration imaging, the complete reproduction of the three-dimensional scenic that realization is blocked, the number of times of the method projection simultaneously is few, device is simple, it is easy to accomplish.
Description
Technical field
The present invention relates to integration imaging technology, more particularly to a kind of three-dimensional body display side that is blocked based on Fourier spectrum
Method.
Background technology
A kind of naked eye three-dimensional technology of integration imaging, can reconstruct three-dimensional scenic to parallax and authentic color entirely, and it is divided into
Shoot and two processes of display.During shooting, the parallax information of three-dimensional scenic is obtained using video camera array, generate micro- image battle array
Row；During display, micro- pattern matrix, according to light path principle, three is gone out in viewing space reconstruction by corresponding microlens array
Dimension scene.
In three-dimensional scenic, there is the situation that target object is blocked by barrier sometimes, as shown in Figure 1.According to
Conventional integration imaging technology cannot then reconstruct the complete steric information of the object, so that greatly influence stereoscopic display effect
Really.For the removal of shelter, it has been disclosed that solution only for the three-dimensional body that is blocked of part effectively, work as target object
When being blocked completely, such scheme will be difficult to high-quality Three-dimensional Display effect.
The content of the invention
It is contemplated that realizing the complete display of three-dimensional body blocked completely in existing integration imaging.
To reach above-mentioned purpose, the present invention proposes a kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum.Institute
Stating method includes two processes of the map generalization of unobstructed rectangular projection parallax and the reconstruction of 3-D view.Unobstructed rectangular projection is regarded
Difference map generalization process, using projector array to a series of raster graphics of three-dimensional scene projection, using preposition scattering medium
Imageing sensor obtain cannot resolution target object information image, it is raw by calculating the Fourier spectrum of rectangular projection disparity map
Into the orthogonal parallax information that elimination is blocked；The process of reconstruction of 3-D view, it is unobstructed by what is recovered using vector rendering intent
Rectangular projection anaglyph is woven into the micro- pattern matrix of integration imaging and shows on a display screen, by microlens array, realizes three
Tie up the display of scene.
The generating process of the unobstructed rectangular projection disparity map, using projector array projecting structural optical to three-dimensional scenic
Surface, by building image analysis algorithm for reconstructing, recovers the orthogonal parallax information that the elimination of different angles is blocked.In projector
In array,P×QPlatform digital projector is respectively with different angles and sequential to three-dimensional scenic surface projectionfloor(M×N×2×k%) amplitude grating figure (wherein, scale factork=0,1 ..., 100), three-dimensional scenic is modulated to raster graphic, by hiding
Block material scattering medium, obtains the light intensity letter from the deformed grating figure modulated by three-dimensional scenic successively on the image sensor
Number.The a series of images obtained from sensor cannot observe directly any information of target object, only receive scattering
Optical signal.The projected light gate figure, at the beginning of being the sinusoidal grating of the phase shift intervals such as different frequency, 4 steps, adjacent sinusoidal grating
Phase difference isπ/2.When (p,q) platform projector projection frequency for (f x ,f y ) sinusoidal grating figureWhen,
Sinusoidal grating figure is represented by：
（1）
Wherein,x、yIt is the pixel point coordinates of raster graphic,x=0,1 ...,M- 1,y=0,1 ...,N- 1,A p, q (x,y) background intensity is represented,B p, q (x, y)/A p, q (x, y) it is fringe contrast, initial phaseσ=0,π/ 2,π, 3π/ 2,p=0,
1 ...,P- 1,q=0,1 ...,Q- 1,f x =0,1/M..., (0.1 ×M×k 1/2- 1)/M,f y =0,1/N...,
(0.1×N×k 1/2- 1)/N.The total light intensity of the image that imageing sensor is receivedAnd then can be in the hope of：
（2）
Wherein,H p, q Represent ambient noise,R p, q (x, y) it is the uneven reflectivity in three-dimensional scenic surface.Due to a frequency
(f x , f y ) correspondence four width difference initial phase sinusoidal grating figure, therefore imageing sensor be sequentially received four come from by three
The light intensity signal of the deformed grating figure of dimension scene modulation, so as to obtain 4 total light intensity values、、、.According to formula：
（3）
Calculate and obtain the (p, q) on width rectangular projection disparity map frequency spectrum (f x , f y ) Fourier coefficient at positionF p, q (f x ,f y ).During Fourier spectrum is calculated, ambient noiseH p, q To be completely eliminated.To the Fourier spectrum for obtainingF p, q (f x ,f y ) carry out inverse Fourier transform and try to achieve the uneven reflectivity in three-dimensional scenic surfaceR p, q (x, y), and then reconstruct (p, q)
Orthogonal anaglyphf p, q (x, y), it is represented by：
（4）
（5）
In the present invention, the orthogonal anaglyph of reconstructionf p, q (x, y) can be observed to remove the three-dimensional scene information blocked.
The process of reconstruction of the 3-D view, by what is obtainedP×QUnobstructed orthogonal anaglyphf p, q (x, y) close
As micro- pattern matrix, integration imaging Three-dimensional Display is carried out using microlens array.Micro- pattern matrix horizontal direction pixel
Number isP×M, vertical direction pixel number isQ×N.Assuming thatE(i, j) represent on micro- pattern matrix theiRowjThe picture of row
Element, then micro- pattern matrixE(i, j) with orthogonal anaglyphf p, q (x, y) meet：
（6）
Wherein：
（7）
（8）
（9）
（10）
The micro- pattern matrix that will synthesizeE(i, j) show on a display screen, by microlens array above, then can be micro-
Complete three-dimensional scene information is watched in lens array front and back, so that the high-quality of three-dimensional scenic of realizing being blocked completely shows.
According to a kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum proposed by the present invention, by with determination
The raster graphic of mathematical function expression, builds image analysis algorithm for reconstructing and recovers high-quality rectangular projection anaglyph, enters
And the complete reproduction of the three-dimensional scenic being blocked using integration imaging Display Realization, while methods described projection number of times is few, device
Simply, it is easy to accomplish.
In addition, may be used also according to a kind of present invention method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum set forth above
With with following additional technical characteristic：
Further, every projector in the projector array is independently arranged, and is equidistantly arranged between neighboring projectors.
Further, the acquisition of the rectangular projection anaglyph correspondence Fourier spectrum, can only obtain Fu of low frequency part
In leaf system number, to reduce the projection number of times of structure light.
The additional aspect of the present invention and advantage will be set forth in part in the description, or be understood by practice of the invention
Arrive.
Brief description of the drawings
Of the invention foregoing and additional aspect and advantage is incited somebody to action from the detailed description of following combination accompanying drawings and embodiment
Further to define and be readily appreciated that, wherein：
The schematic diagram that Fig. 1 is blocked for target object in three-dimensional scenic.
Fig. 2 is a kind of flow chart of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum proposed by the present invention.
Fig. 3 is installation drawing of the projector array to three-dimensional scene projection.
Fig. 4 is the schematic diagram that single projector projects sine grating pattern.
Fig. 5 is the partial orthogonality anaglyph of reconstruction in embodiment.
Fig. 6 is the schematic diagram that integration imaging shows.
Fig. 7 is the three-dimensional scenic reproduced in different depth plane in embodiment.
Shown by reference numeral in above-mentioned accompanying drawing is：
1 three-dimensional scenic, 2 shelters, 3 video camera arrays, 4 projector arrays, 5 imageing sensors, 6 raster graphics, 7 projectors, 8
Display screen, 9 microlens arrays, 10 three-dimensional scenics rebuild, 11 beholders.
It should be appreciated that above-mentioned accompanying drawing is schematical, it is not drawn to draw.
Specific embodiment
It is described below in detail the one of a kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum proposed by the present invention
Individual exemplary embodiments, the example of the embodiment is shown in the drawings.Be necessary it is pointed out here that, the embodiments described below
It is exemplary, it is intended to which the present invention will be further explained, and it is not intended that limiting the scope of the invention, the neck
Field technique skilled person makes some nonessential modifications and adaptations to the present invention according to foregoing present invention, still falls within this hair
Bright protection domain.
A kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum proposed by the present invention is described with reference to the accompanying drawings.
Referring to the drawings 2, idiographic flow of the invention is as follows：
In the generating process of unobstructed rectangular projection disparity map, referring to the drawings shown in 3,8 × 8 digital projections of computer simulation
Machine is respectively with different angles and sequential to the amplitude grating figure of three-dimensional scenic surface projection 200 × 200 × 2 × 40%（I.e.P=8,Q
=8,M=200,N=200,k= 40）, three-dimensional scenic is modulated to raster graphic, by shelter frosted glass, in phase
The light intensity signal from the deformed grating figure modulated by three-dimensional scenic is obtained on machine successively.Every projector's projected light grid figure
Shape, is the sinusoidal grating of the phase shift intervals such as different frequency, 4 steps, and the initial phase difference of adjacent sinusoidal grating isπ/ 2, referring to the drawings 4 institutes
Show.When (p, q) platform projector projection frequency for (f x , f y ) sinusoidal grating figureWhen, sinusoidal light
Gate figure is represented by formula（1）, wherein,x=0,1 ..., 199,y=0,1 ..., 199,σ=0,π/ 2,π, 3π/ 2,p =
0,1 ..., 7,q=0,1 ..., 7,f x =0,1/200 ..., 125/200,f y =0,1/200 ..., 125/200,A p, q (x,y)=127.5,B p, q (x, y) = 127.5.The total light intensity on image that camera is receivedCan be by formula（2）
Try to achieve.Due to a frequency (f x , f y ) correspondence 4 width difference initial phase sinusoidal grating figure, therefore camera is sequentially received four
The individual light intensity signal from the deformed grating figure modulated by three-dimensional scenic, so as to obtain 4 total light intensity values、、、.Using formula（3）Can try to achieve (p, q) on width rectangular projection disparity map frequency spectrum
(f x , f y ) Fourier coefficient at positionF p, q (f x , f y ).To the Fourier spectrum for obtainingF p, q (f x , f y ) to carry out Fourier inverse
Conversion, i.e. formula（4）, can be in the hope of the uneven reflectivity in three-dimensional scenic surfaceR p, q (x, y), and then by formula（5）Reconstruction is gone out
Except block (p, q) an orthogonal anaglyph.The partial orthogonality anaglyph for obtaining is rebuild in the specific embodiment of the inventionf 3, 0(x, y) andf 3, 7(x, y) referring to the drawings shown in 5.
In the process of reconstruction of 3-D view, principle is referring to the drawings shown in 6.8 × 8 unobstructed orthogonal parallaxes that will be obtained
Image, according to formula（6）-（10）Synthesizing micro- pattern matrix, micro- pattern matrix horizontal direction number of pixels is 8 × 200=
1600, vertical direction pixel number is 8 × 200=1600.It is displayed in not using the Automated library system imaging three-dimensional based on depth
The three-dimensional scenic of unobstructed carrying complete information is reconstructed with depth plane, referring to the drawings shown in 7.
According to a kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum proposed by the present invention, by with determination
The raster graphic of mathematical function expression, builds image analysis algorithm for reconstructing and recovers high-quality rectangular projection anaglyph, enters
And the complete reproduction of the three-dimensional scenic being blocked using integration imaging Display Realization, while methods described projection number of times is few, device
Simply, it is easy to accomplish.
Further, in a particular embodiment of the present invention, every projector in simulated projections machine array is independently arranged,
Equidistantly arranged between neighboring projectors, spacing is 12.7cm.
Further, in a particular embodiment of the present invention, for the generation of each orthogonal anaglyph, correspondence is only obtained
The Fourier coefficient of 40% spectrum point in Fourier spectrum, that is, it is 200 × 200 × 2 × 40%=32000 to project sinusoidal grating sum.
Claims (6)
1. a kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum, it is characterised in that methods described includes unobstructed
Two processes of the map generalization of rectangular projection parallax and the reconstruction of 3-D view：The generating process of unobstructed rectangular projection disparity map,
Using projector array to a series of raster graphics of three-dimensional scene projection, nothing is obtained using the imageing sensor of preposition scattering medium
The image of method resolution target object information, by calculating the Fourier spectrum of rectangular projection disparity map, it is orthogonal that generation elimination is blocked
Parallax information, carries out the reconstruction of 3-D view afterwards, the unobstructed rectangular projection parallax that will be recovered using vector rendering intent
Image is woven into the micro- pattern matrix of integration imaging and shows on a display screen, by microlens array, realizes unobstructed three dimensional field
Scape shows.
2. a kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum according to claim 1, it is characterised in that
In the generating process of unobstructed rectangular projection disparity map,P×QPlatform digital projector is respectively with different angles and sequential to three dimensional field
Scape surface projectionfloor(M×N×2×k%) amplitude grating figure (wherein, scale factork=0,1 ..., 100), three-dimensional scenic
Raster graphic is modulated, by shelter scattering medium, is obtained to come from successively on the image sensor and is adjusted by three-dimensional scenic
The light intensity signal of the deformed grating figure of system.
3. a kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum according to claim 1 and claim 2,
Characterized in that, the raster graphic for using, at the beginning of being the sinusoidal grating of the phase shift intervals such as different frequency, 4 steps, adjacent sinusoidal grating
Phase difference isπ/ 2, when (p, q) platform projector projection frequency for (f x , f y ) sinusoidal grating figure
When, light intensity letter of four for being sequentially received in the hope of imageing sensor from the deformed grating figure modulated by three-dimensional scenic
Number, so as to obtain four total light intensity values、、、, using four total light
Intensity values calculate and obtain the (p, q) on width rectangular projection disparity map frequency spectrum (f x , f y ) Fourier coefficient at positionF p, q (f x ,f y ), to the Fourier spectrum for obtainingF p, q (f x , f y ) carry out inverse Fourier transform and try to achieve the uneven reflectivity in three-dimensional scenic surfaceR p, q (x, y), and then reconstruct that removal blocks the (p, q) an orthogonal anaglyphf p, q (x, y)。
4. a kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum according to claim 1, it is characterised in that
In the process of reconstruction of 3-D view, by what is obtainedP×QUnobstructed orthogonal anaglyphf p, q (x, y) synthesize micro- image
Array, micro- pattern matrix horizontal direction number of pixels isP×M, vertical direction pixel number isQ×N, it is assumed thatE(i, j)
Represent on micro- pattern matrixiRowjThe pixel of row, then micro- pattern matrixE(i, j) with orthogonal anaglyphf p, q (x, y)
Meet：, wherein：,,,, the micro- pattern matrix that will synthesizeE(i, j) show on a display screen, by lenticule battle array above
Row, complete three-dimensional scene information is shown in microlens array front and back.
5. a kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum according to claim 1, it is characterised in that
Every projector in the projector array is independently arranged, and is equidistantly arranged between neighboring projectors.
6. a kind of method for displaying three-dimensional object thereby that is blocked based on Fourier spectrum according to claim 1, it is characterised in that
The acquisition of the rectangular projection anaglyph correspondence Fourier spectrum, can only obtain the Fourier coefficient of low frequency part.
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| CN110322527A (en) * | 2019-05-21 | 2019-10-11 | 华为技术有限公司 | A kind of method for generating pattern and terminal |
| CN113256798A (en) * | 2021-06-04 | 2021-08-13 | 猫岐智能科技（上海）有限公司 | System and method for generating light curtain shielding area |
| CN114322841A (en) * | 2021-12-06 | 2022-04-12 | 重庆邮电大学 | Dynamic three-dimensional measurement method and system for projection grating phase shift generation |
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