CN101527865A - Projection type high-resolution multi-view auto-stereo display system - Google Patents

Projection type high-resolution multi-view auto-stereo display system Download PDF

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CN101527865A
CN101527865A CN200910076210A CN200910076210A CN101527865A CN 101527865 A CN101527865 A CN 101527865A CN 200910076210 A CN200910076210 A CN 200910076210A CN 200910076210 A CN200910076210 A CN 200910076210A CN 101527865 A CN101527865 A CN 101527865A
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projecting apparatus
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resolution
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projection
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CN101527865B (en
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秦开怀
罗建利
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Tsinghua University
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Abstract

The invention relates to a projection type high-resolution multi-view auto-stereo display system which is characterized by comprising an optical display screen and an array with n*m sets of projectors, n is row, m is line, and the projection type high-resolution multi-view auto-stereo display system also comprises a computer cluster rendering subsystem and a camera used for geometry and brightness correction. The projector array is divided into m sets of single-view projector groups, and each set of single-view projector group couples and displays a high-resolution large display area by n sets of projectors by a combination display wall technology. Each set of projectors display one view image of a scene, and m sets of projectors display m view images of the scene at the same time, thereby realizing the multi-view panoramic stereo effect.

Description

A kind of projection type high-resolution multi-view auto-stereo display system
Technical field
The present invention relates to a kind of projection type high-resolution multi-view auto-stereo display system, particularly correlation techniques such as the array of rear-projectors locus aligning method in the projection type high-resolution multi-view auto-stereo display system, optical screen making.
Background technology
Free 3 D display technology is meant the three-dimensional stereo display technique that need not wear such as auxiliary devices such as anaglyph spectacleses.It has solved senses of discomfort such as feeling sick of wearing that auxiliary device brings, dizziness.
Free 3 D display technology mainly contains two kinds of liquid crystal free 3 D display technology and projection free 3 D display technologies.The screen size of liquid crystal auto-stereo display system also is restricted at present, and the viewpoint number that provides is limited.Projection multi-view auto stereo display technique has the resolution height, the visual field is big, immersive effects good, be fit to the multi-user, advantage such as motion parallax can be provided.
Free 3 D display technology mainly adopts post lenticulation or parallax grating to separate viewpoint.Parallax grating is used for the liquid crystal auto-stereo display system more.Shortcoming is that the opaqueness of black streaking has reduced image brightness in the grating; To scratch phenomenon obvious for string during large scale; Viewpoint number grating for a long time is easy to generate shortcomings such as diffraction effect.Parallax grating realize the viewpoint number limited, seldom be used for the projection multi-view auto-stereo display system.The post lenticulation can be realized many viewpoints, and the viewpoint number is unrestricted in theory, is used in the projection multi-view auto-stereo display system more.
Many projection combinations show that wall system can offer the high-resolution of a cheapness of user, big viewing area.Adopt at present the large-scale computer cluster to drive array of rear-projectors, and computer and projecting apparatus are corresponding one by one, by utilizing geometric correction algorithm and gamma correction algorithm many projecting apparatus are coupled as a low cost, high-resolution demonstration wall technology maturation.
Summary of the invention
For this reason, we have invented a kind of projection type high-resolution multi-view auto-stereo display system.System offers the solid that the user can freely watch, and utilizes combination to show that wall technology provides high-resolution, big viewing area simultaneously.
Projection type high-resolution multi-view auto-stereo display system is characterised in that and contains: optical displays curtain, n*m platform array of rear-projectors, and n is row, m draws subsystem for row, computer cluster and confession is used for how much and the camera of gamma correction, wherein:
Described optical displays is the front projection type optical displays curtain of an employing post lenticulation structure, form by post lenticulation and front projection screen two parts, this front projection screen is divided into the capable s row of r sub-screen zone, and each sub-screen zone measure-alike also given and numbering;
Described n*m platform array of rear-projectors, be divided into m group single view projection group, a visual point image of every group of projecting apparatus displayed scene, m group projecting apparatus shows m visual point image simultaneously, described every group of single view projecting apparatus is made up of n platform projecting apparatus, n＞=1, this n platform projecting apparatus adopt the mode of the capable * s row of r to make up big viewing area of demonstration, n=r*s;
The resolution of every projecting apparatus is resolution_x*resolution_y, resolution after the combination of n platform projecting apparatus shows is (resolution_x*s) * (resolution_y*r), and the total resolution of described system is (resolution_x*s) * (resolution_y*r) * m;
In described each group single view projecting apparatus group, the optical center of each projecting apparatus is conllinear in vertical direction, is called projection group viewpoint center line; Between described different single view projecting apparatus, described projection group viewpoint center line equal intervals is in the horizontal direction arranged, and spacing is smaller or equal to the average interpupillary distance 65mm of human eye;
For described n*m platform array of rear-projectors, showing visual point image number m, under the condition that the demonstration compound mode r*s of each visual point image and the resolution of described system are determined:
The mounting means of described n*m platform projecting apparatus is positioned at from described optical displays distance and is D and the plane parallel with described optical displays, described distance D is tabled look-up by the size of the demonstration subregion of described every projecting apparatus and is obtained, in described installation region, the center of described n*m platform array of rear-projectors and the center-aligned of described optical displays curtain, described m root projection group viewpoint center line is the center with the center of described optical displays, is spacing arrangement with the average interpupillary distance 65mm of described human eye;
The optical center of described each projecting apparatus is positioned on the installation site grid of described projecting apparatus installation region, described installation site grid is made of q*n bar horizontal line and described m root projecting apparatus group viewpoint center line, q=[pw/65], pw is the projecting apparatus width, described q*n bar horizontal line is that the horizontal center line with the installation region is the center, with ph*k is the horizontal line that spacing is symmetrically distributed, ph is the projecting apparatus height, k is in order to guarantee the spacing between the neighbouring projecting apparatus, recommendation is 1.2, arrange n platform projecting apparatus on every projecting apparatus group viewpoint center line, with viewpoint group projecting apparatus between the upper and lower every the grid number of hits be q, the projecting apparatus on the adjacent projections instrument viewpoint center line staggers mutually;
Described computer cluster is drawn subsystem, wherein at least one projecting apparatus in every each single view projecting apparatus group of computer control according to and carry out computer cluster according to the following steps and draw:
Step (1). generate a described m visual point image by viewpoint change;
Step (2). described each visual point image is subdivided into the capable s row of described r subimage;
Step (3). described each subimage in segmentation back is distributed to corresponding projecting apparatus shows, make that j platform projecting apparatus shows j number of sub images in i the visual point image in the i group single view projecting apparatus group, the azimuth by described each projecting apparatus of deflection makes the viewing area of every projecting apparatus cover the sub-screen zone of correspondence fully;
Step (4). calculate total viewing area dislayA of described every group of single view projection group,
dislayArea i = ∪ j = 1 j = n displayArea i j , i ∈ [
Step (5). calculate the maximum common rectangular viewing area commDislayA of described n*m platform array of rear-projectors,
commDislayArea = ∩ i = 1 i = m displayA
Step (6). determine the segmentation grid commDislayA of the maximum public viewing area of described n*m platform projected array, mesh spacing dist is a set point;
Step (7). the display result of using described digital camera to take each projecting apparatus in the position of setting;
Step (8). making every group of shown image of single view projecting apparatus group in the described n*m platform projected array with geometric correction method is corresponding visual point image, and the image that shows between group aligns mutually;
Step (9). use the edge to merge brightness correcting method and eliminates overlay region jump in brightness in each single view projecting apparatus group, make between each subimage brightness even.
Described kind of projection type high-resolution multi-view auto-stereo display system is characterized in that the minimum constructive height of the installation region of described n*m platform projection correspondence is 1800mm.
Projection type high-resolution multi-view auto-stereo display system has been realized high-resolution multi-view auto stereo display, the free stereo effect that many viewpoints is provided and looks around.
Description of drawings
Fig. 1. the structural representation of projection type high-resolution multi-view auto-stereo display system;
Fig. 2. many projections cluster method for drafting schematic diagram;
Fig. 3. post lenticulation optical displays curtain schematic diagram;
Fig. 4. post lenticulation optical displays curtain viewpoint is separated schematic diagram;
Fig. 5. the schematic diagram of array of rear-projectors locus aligning method; Fig. 5 is subregion combination displaying scheme a.2*3; Fig. 5 b. projecting apparatus installation region; The vertical light axis of Fig. 5 c. projecting apparatus group; Fig. 5 d. projecting apparatus installation site grid; Fig. 5 is array of rear-projectors spatial placement scheme e.6*8; Fig. 5 f. i group projecting apparatus viewing area schematic diagram; Fig. 5 g. j group projecting apparatus viewing area schematic diagram; The public view field of friendship is asked in Fig. 5 h.m group Projection Display zone; The public view field of Fig. 5 i. grid segmentation result schematic diagram; The public view field of Fig. 5 j. grid segmentation result schematic diagram.
1 is post optics of lens display screen, 2 is array of rear-projectors, and 3 are computer cluster drafting subsystem, and 4 is high-resolution camera, 5 is the post lenticulation, 6 is front projection screen, and 7 is double faced adhesive tape, and 8 is viewpoint 1,9 is viewpoint 2,10 is viewpoint 3,11st, the projecting apparatus of projection viewpoint 1 image, the 12nd, the projecting apparatus of projection viewpoint 2 images, the 13rd, the projecting apparatus of projection viewpoint 3 images, 14 are the demonstration subregion in the combination demonstration, and 15 are projection group viewpoint center line, and 16 is the horizontal line at projector position place, 17 is the projecting apparatus installation region, 18 screen center's lines, 19 installation region horizontal center lines, 20 is the maximum common rectangular viewing area of projected array.
Embodiment
The projection type high-resolution multi-view auto stero includes: optical displays curtain 1, n*m platform array of rear-projectors 2, computer cluster draw that subsystem 3, one are used for how much and the high-resolution camera 4 of gamma correction.
Wherein, n*m platform array of rear-projectors is divided into m group single view projecting apparatus group, and every group has n platform projecting apparatus.Every group of single view projecting apparatus group adopts r*s (r is capable, the s row) mode to make up a visual point image of displayed scene.Be that every group of projecting apparatus combination shows the big viewing area of high-resolution, this zone is listed as the combination of sub-viewing area by the capable s of r, and each projecting apparatus shows one of them subregion, and n=r*s.M visual point image of m group projecting apparatus displayed scene, their viewing area overlaps mutually.M the visual point image that cluster drawing system driving n*m array of rear-projectors throws scene simultaneously is on optical screen, and system spatially separates m visual point image by the post lenticulation.
For sake of clarity, projection viewpoint group is sorted from left to right, projecting apparatus sorts from top to bottom in same group, shows that subregion sorts with row major.Remember that i group single view projection group is: VP i, j platform projecting apparatus is designated as in the i group single view projection group: P i j, k shows that subregion is designated as: subArea k, the big zone that the combination of i group projecting apparatus group shows is designated as displaySumArea i, the demonstration subregion of j platform projector projects is designated as displayArea in the i group projecting apparatus group i jHave:
1. each single view projection group is made up of n platform projecting apparatus:
VP i = ∪ j = 1 j = n P i j , i ∈ [ 1 , m ]
2. j demonstration subregion is responsible for demonstration by j platform projecting apparatus in the single view projection group:
displayArea i j = subArea j , j ∈ [ 1 , n ]
3. each single view projection group is responsible for showing whole big viewing area, and this zone is listed as sub-viewing area by the capable s of r and combines:
displaySumAre a i = Σ j = 1 n displayArea i j , i ∈ [
Wherein, n=r*s.
4. the combination viewing area of every group of projecting apparatus overlaps,
displaySumArea i＝displaySumArea j
The data source of projection type high-resolution multi-view auto-stereo display system has two kinds of multi-view image and multi-view shapes.Multi-view image is the image sets of the scene that collects on a plurality of viewpoint positions of camera, and multi-view shape is for generating the multi-view shape of scene by computer graphics viewpoint change method.Fig. 2 is the cluster rendering algorithm schematic diagram of system, and it is an example with multi-view graphic data source.The step of algorithm is:
1. generate a plurality of viewpoint figures of scene by the viewpoint change method of computer graphics.Generate the multi-view shape of m David's model among Fig. 2 by viewpoint change.
2. according to the combination displaying scheme, each visual point image is subdivided into the capable s row of r subimage.David's image of each viewpoint is subdivided into 2 row, 2 row subimages among Fig. 2.
3. the subimage after computer will segment is distributed to corresponding projecting apparatus and shows, j platform projecting apparatus shows j number of sub images in i the visual point image in the i group projection group, and its viewing area is j and shows subregion.Be sent to the 1st to 4 projecting apparatus in the 1st group of projecting apparatus respectively as the 1st to 4 number of sub images in the 1st visual point image among Fig. 2, corresponding demonstration subregion is respectively the 1st to 4.
Projection type high-resolution multi-view auto-stereo display system is played up m visual point image simultaneously.Each visual point image is made up of the capable s row of r subimage, adopts the r*s mode to make up demonstration by n platform projecting apparatus.The resolution of each visual point image after each single view projection group combination shows is (resolution_x*s) * (resolution_y*r).System's total resolution is (resolution_x*r) * (resolution_y*s) * m, and m visual point image promptly is provided simultaneously, and the horizontal direction resolution that each visual point image shows is resolution_x*r, and vertical direction resolution is (resolution_y*s).Wherein, the resolution of every projecting apparatus is resolutio_x*resolution_y.
High-resolution camera is used for the geometric correction and the gamma correction of system.Use viewing area and the luminosity response of each projecting apparatus of camera on screen, calculate the homogeneous transformation relation of projection screen space to image space.By geometric correction and gamma correction algorithm the n platform projecting apparatus in the same viewpoint group is coupled as high-resolution, big viewing area then.
Projection type high-resolution multi-view auto-stereo display system adopts express network to connect computer cluster and draws subsystem.At present gigabit Ethernets that adopt also have high speed interconnected systemss such as the myrinet of use more.According to the number of the delivery outlet of the graphics processing card of computer configuration, every computer can connect one or more projecting apparatus simultaneously.
Projection type high-resolution multi-view auto-stereo display system adopts the front projection type optical displays curtain of post lenticulation structure.
The horizontal direction of post lenticulation is the lens arra of identical parameters, and vertical direction constitutes for the cylinder striped, as Fig. 3.Projection type high-resolution multi-view auto-stereo display system optical displays curtain is made up of post lenticulation and front projection screen two parts.The manufacture method of screen is glued together double faced adhesive tape, post lenticulation and front projection screen for using cold paperhanging machine.Step for adhering is:
The first step, bonding front projection screen and double faced adhesive tape.Post lenticulation, front projection screen and double faced adhesive tape are cut into identical size, then double faced adhesive tape and front projection screen are put between two rollers, tear the barrier paper of double faced adhesive tape, rotate cold paperhanging machine front projection screen front and double faced adhesive tape are bonded together.
Second step, bonding front projection screen and post lenticulation.The front projection screen and the post lenticulation of bonding double faced adhesive tape are put between two rollers, made the bottom surface of the not adhesive surface of double faced adhesive tape, tear the barrier paper of double faced adhesive tape then, rotate cold paperhanging machine front projection screen and post lenticulation are bonded together over against the post lenticulation.
Fig. 4 is that the optical displays curtain of system separates the viewpoint schematic diagram in the locus.The back side of the focal plane of post lenticulation and post lens coincides, and it can be in the horizontal direction reflects the light of incident in the other direction according to former road, in vertical direction incident ray is dispersed.Therefore in the place and parallel with the optical screen plane (vision area), the observer who is in this plane can see the image of this projector projects to the optical displays curtain, and can't see the image of all the other projector projects with the light reflected back projecting apparatus of projector projects.Drawn 3 vision areas 8,9,10 among Fig. 4, the projecting apparatus 11,12,13 of projection different points of view image has been arranged at the vertical plane place of each vision area.In theory, the user only observing the visual point image of projecting apparatus 11 projection, and can not see in like manner in viewpoint 8 and 9 same phenomenon being arranged also by the image of viewpoint 9 and 10 on viewpoint 8 positions.When user's right and left eyes was in different vision areas respectively, the difference of two observed images merged generation stereoscopic vision by brain.
Therefore, the horizontal interval of two adjacent vision areas can not surpass an interpupillary distance apart from maximum, otherwise observer's right and left eyes can not be in two vision areas simultaneously, also just can't observe the different points of view image simultaneously.All projecting apparatus are installed in the vertical plane at vision area place in every group of single view projection group, and the projecting apparatus of different points of view group is installed in the vertical plane of different vision areas place.Therefore, the optical center of all projecting apparatus of single view projection group is positioned at the plane and the conllinear at vision area place, and this line is referred to as projection group viewpoint center line, and it is positioned at vision area and is parallel to the short transverse of optical screen (generally being vertical direction).Because the horizontal interval of two adjacent vision areas can not surpass an interpupillary distance apart from maximum, so the projection group viewpoint center line horizontal range of different points of view group can not be greater than an interpupillary distance.Business projector's fuselage width is generally greater than an interpupillary distance in the market, and therefore how arranging many viewpoints projection group on the locus is a problem.
For this, in the horizontal direction the former road of incident ray is returned according to the post lenticulation, we have invented array of rear-projectors locus aligning method the optical characteristics of dispersing in vertical direction.The characteristics of method are: the optical center of the projecting apparatus in every group of single view projection group is positioned on the projection group viewpoint center line, and the projection group viewpoint center line level interval of adjacent viewpoint projection group is not more than an interpupillary distance.Below, (n=6, m=8) projected array adopt the 2*3 mode to make up display system for our method of row detailed description, as Fig. 5 with 6*8.
The method detailed step is:
1. according to system's viewpoint number and resolution requirements, determine projected array and combination display mode scheme.The n*m projected array provides m visual point image simultaneously, and the r*s combination shows that the resolution that provides is (resolution_x*s) * (resolution_y*r).System's total resolution is (1024*3) * (768*2) * 8 among Fig. 5, and Fig. 5 a is a 2*3 combination displaying scheme schematic diagram.
2. determine the installation region of array of rear-projectors.Projection size and projector distance form are arranged on the projecting apparatus specification.According to this table, can find the distance D of projecting apparatus from optical screen by the size of the demonstration subregion of projecting apparatus.The installation region is positioned at from optical screen distance and is D and parallel with optical screen plane.Projecting apparatus adopts the lifting mode, require than people height, so the minimum constructive height of installation region is liftoff 1800mm (height for each person) that maximum height is the laboratory height, and the border, the left and right sides of installation region is a breadboard left and right sides wall.So far, determined the rectangle installation region.As 17 being the installation region among Fig. 5 b.
3. determine the projection group viewpoint position of center line of each viewpoint projection group.The center-aligned of the center of array of rear-projectors and post lenticulation optical displays curtain so be the center with the optical screen center in the installation region, is a spacing arrangement m root projection group viewpoint center line with the average interpupillary distance 65mm of human eye.As Fig. 5 c is 8 projection group viewpoint center line locus schematic diagrames, and 15 are projection group viewpoint center line.
4. determine the horizontal direction installation site at projector lens center.Our method is the q*n bar horizontal line that draws in the projecting apparatus installation region, and it and m root projection group viewpoint center line constitute projecting apparatus installation site grid, and the intersection point of grid is the position that projecting apparatus is installed.Wherein, q=[pw/65] be the round multiple of projecting apparatus width with respect to the human eye interpupillary distance, pw is the projecting apparatus width, the height of projecting apparatus is ph.Horizontal center line with the installation region is the center, is the q*n bar horizontal line that spacing is drawn and is symmetrically distributed with ph*k.Wherein k is in order to guarantee the spacing between the neighbouring projecting apparatus, and recommendation is 1.2.With system among Fig. 5 is row: the horizontal center line 19 with the installation region is the center, and vDist is the spacing q*n bar horizontal line 16 that draws,
vDist＝ph。Q*n bar horizontal line 16 constitutes (q*n) * m grid with m root projection group viewpoint center line 15, as Fig. 5 d.
5. on the grid of projecting apparatus installation site, arrange projecting apparatus, require the optical center of projecting apparatus to be positioned on the grid of installation site, arrange n platform projecting apparatus on every projection group viewpoint center line, with viewpoint group projecting apparatus between the upper and lower filter lattice number of hits be q, projecting apparatus on the adjacent projections group viewpoint center line staggers mutually, and both are clashed on the locus.Fig. 5 e is 6*8 array of rear-projectors installation site result.
6. with the capable s row of projection screen area dividing r sub-screen zone.The aspect ratio of chooser screen area is identical with the aspect ratio of projecting apparatus viewing area, and the length and width in each sub-screen zone equate.The antithetical phrase screen area is numbered with row major.The viewing area of j projecting apparatus requires to cover fully j sub-screen area in every group of projecting apparatus.As Fig. 5 a is the result that on-screen display (osd) area is divided into 2 row, 3 row sub-screen zones.
7. determine the viewing area of each projecting apparatus.Require the viewing area of every projecting apparatus to cover corresponding sub-screen zone fully, promptly the viewing area of j projecting apparatus covers j sub-screen area fully.The demonstration sub-screen zone subA that deflection projecting apparatus azimuth (anglec of rotation of horizontal direction, and the angle of pitch on the vertical direction) covers the projecting apparatus viewing area displayA that is numbered j to be numbered j fully is as Fig. 5 f and Fig. 5 g.
8. calculate total viewing area dislayA of every group of single view projection group.But total viewing area of viewpoint projection group is the summation of all projecting apparatus viewing areas in the group, that is:
dislayArea i = ∪ j = 1 j = n displayArea i j , i ∈ [
9. ask the maximum common rectangular viewing area commDislayA of projected array.The maximum public viewing area of projected array is the public common factor of total viewing area of m group single view projection group.
commDislayArea = ∩ i = 1 i = m displayA
Fig. 5 h, 20 is the maximum common rectangular viewing area commDislayArea of projected array.
10. determine the segmentation grid commDislayA of the maximum public viewing area of projected array.With dist is that spacing is carried out the grid segmentation to the public viewing area of maximum, and mesh spacing dist suggestion value is about 50mm.
11. many groups projecting apparatus is carried out geometric correction and gamma correction.
The method of geometric correction is:
The first step: the computer drives projecting apparatus takes turns indicating characteristic dot image image.A plurality of characteristic point P are arranged among the image iTake the display result camerImage of each projecting apparatus in a fixed position with high-resolution digital camera iAdopt image processing algorithm such as Corner Detection or threshold value segregation method to try to achieve camerImage jMiddle characteristic point P ' iAnd with P ' iWith P among the computer frame buffer image iCorresponding one by one.Obtain from P ' iTo P iTransform matrix M.
P i＝M*P′ i。
Second step: the segmentation grid projectorAreaMesh that calculates effective viewing area of each projecting apparatus i jEffectively the segmentation grid of viewing area is that projecting apparatus viewing area and maximum public viewing area segmentation grid are asked the friendship result.
projectorAreaMesh i j = commDislayMesh ∩ displayArea i j , i ∈ [ 1 , m ] , j ∈ [ 1 , n ]
The 3rd step: grid imageAreaMesh is corrected in the frame buffer of obtaining effective viewing area segmentation grid correspondence of each projecting apparatus i j
imageAreaMesh i j = M * projectorAreaMesh i j
The 4th step: in demonstration, pass through the real-time correcting image of secondary rendering.Method is to grasp image in the frame buffer when playing up for the first time, utilizes frame buffer to correct grid then image is corrected distortion, at last the image after correcting is played up for the second time.The method of correcting distortion is earlier image lattice to be segmented, and obtains the segmentation grid imageMesh of image.The segmentation grid of image requires identical with the line number and the columns of frame buffer calibration grid; Utilize transform matrix M that image segmentation grid is corrected then, the image segmentation grid imageMesh ' after obtaining to correct.
imageMesh’＝M*imageMesh
The image of correcting shows that through projecting apparatus the display image of back on screen is displayimageMesh.Then have by displaying contents after the projective transformation for the frame buffer isomorphism in the effective coverage, evenly show and with the accurate registration image of adjacent image.
displayimageMesh＝M -1*imageMesh’＝imageMesh
By the complete image of image for accurately aliging that top four step geometric corrections show every group of projecting apparatus of array of rear-projectors, the image that shows between group accurately aligns.
Effective viewing area of adjacent projections instrument overlaps each other on the same group, can align by the projected image in the overlay region after the geometric correction, but because each pixel simultaneously by a plurality of projecting apparatus demonstrations, causes overlay region brightness to be undergone mutation.Need use brightness correcting method to make overlay region brightness uniformity for this reason.We adopt the edge to merge brightness correcting method, and its step is as follows:
The first step: calculate the effective overlapping viewing area of every projecting apparatus, be designated as projectorOverlapAreaMesh i jEffectively the overlapping region is the overlapping region of effective viewing area of projecting apparatus on the same group.
Second step: obtain the corresponding effectively frame buffer overlapping region imageOverlapAreaMesh of overlapping region i j:
imageOverlapAreaMesh i j = M * projectorOverlapAreaMesh i j
The 3rd step: the pixel brightness of frame buffer overlapping region is decayed, make the overlay region display brightness even.The pixel brightness decay factor is d/w.Wherein, w is the width that effective overlay region point is expert at, and d is effective overlay region point isolated edge distance.
By the complete image of image for aliging that geometry and gamma correction show every group of projecting apparatus of array of rear-projectors, the image that shows between group accurately aligns, and the brightness between image is even.

Claims (2)

1. projection type high-resolution multi-view auto-stereo display system, it is characterized in that containing: optical displays curtain, n*m platform array of rear-projectors, n is row, and m draws subsystem for row, computer cluster and confession is used for how much and the camera of gamma correction, wherein:
Described optical displays is the front projection type optical displays curtain of an employing post lenticulation structure, form by post lenticulation and front projection screen two parts, this front projection screen is divided into the capable s row of r sub-screen zone, and each sub-screen zone measure-alike also given and numbering;
Described n*m platform array of rear-projectors, be divided into m group single view projection group, a visual point image of every group of projecting apparatus displayed scene, m group projecting apparatus shows m visual point image simultaneously, described every group of single view projecting apparatus is made up of n platform projecting apparatus, n＞=1, this n platform projecting apparatus adopt the mode of the capable * s row of r to make up big viewing area of demonstration, n=r*s;
The resolution of every projecting apparatus is resolution_x*resolution_y, resolution after the combination of n platform projecting apparatus shows is (resolution_x*s) * (resolution_y*r), and the total resolution of described system is (resolution_x*s) * (resolution_y*r) * m;
In described each group single view projecting apparatus group, the optical center of each projecting apparatus is conllinear in vertical direction, is called projection group viewpoint center line; Between described different single view projecting apparatus, described projection group viewpoint center line equal intervals is in the horizontal direction arranged, and spacing is smaller or equal to the average interpupillary distance 65mm of human eye;
For described n*m platform array of rear-projectors, showing visual point image number m, under the condition that the demonstration compound mode r*s of each visual point image and the resolution of described system are determined:
The mounting means of described n*m platform projecting apparatus is positioned at from described optical displays distance and is D and the plane parallel with described optical displays, described distance D is tabled look-up by the size of the demonstration subregion of described every projecting apparatus and is obtained, in described installation region, the center of described n*m platform array of rear-projectors and the center-aligned of described optical displays curtain, described m root projection group viewpoint center line is the center with the center of described optical displays, is spacing arrangement with the average interpupillary distance 65mm of described human eye;
The optical center of described each projecting apparatus is positioned on the installation site grid of described projecting apparatus installation region, described installation site grid is made of q*n bar horizontal line and described m root projecting apparatus group viewpoint center line, q=[pw/65], pw is the projecting apparatus width, described q*n bar horizontal line is that the horizontal center line with the installation region is the center, with ph*k is the horizontal line that spacing is symmetrically distributed, ph is the projecting apparatus height, k is in order to guarantee the spacing between the neighbouring projecting apparatus, recommendation is 1.2, arrange n platform projecting apparatus on every projecting apparatus group viewpoint center line, with viewpoint group projecting apparatus between the upper and lower every the grid number of hits be q, the projecting apparatus on the adjacent projections instrument viewpoint center line staggers mutually;
Described computer cluster is drawn subsystem, wherein at least one projecting apparatus in every each single view projecting apparatus group of computer control according to and carry out computer cluster according to the following steps and draw:
Step (1). generate a described m visual point image by viewpoint change;
Step (2). described each visual point image is subdivided into the capable s row of described r subimage;
Step (3). described each subimage in segmentation back is distributed to corresponding projecting apparatus shows, make that j platform projecting apparatus shows j number of sub images in i the visual point image in the i group single view projecting apparatus group, the azimuth by described each projecting apparatus of deflection makes the viewing area of every projecting apparatus cover the sub-screen zone of correspondence fully;
Step (4). calculate total viewing area of described every group of single view projection group
Figure A2009100762100003C1
dislayArea i = ∪ j = 1 j = n display Area i j , i ∈ [
Step (5). calculate the maximum common rectangular viewing area of described n*m platform array of rear-projectors
Figure A2009100762100003C3
commDislayArea = ∩ i = 1 i = m displayA
Step (6). determine the segmentation grid of the maximum public viewing area of described n*m platform projected array
Figure A2009100762100003C5
Mesh spacing dist is a set point;
Step (7). the display result of using described digital camera to take each projecting apparatus in the position of setting;
Step (8). making every group of shown image of single view projecting apparatus group in the described n*m platform projected array with geometric correction method is corresponding visual point image, and the image that shows between group aligns mutually;
Step (9). use the edge to merge brightness correcting method and eliminates overlay region jump in brightness in each single view projecting apparatus group, make between each subimage brightness even.
2. according to 1 described kind of projection type high-resolution multi-view auto-stereo display system of right, it is characterized in that the minimum constructive height of the installation region of described n*m platform projection correspondence is 1800mm.
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