CN100428136C - Correcting method for large-scale 3D spliced display wall - Google Patents
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Abstract
The invention discloses a correction method of large scale three-dimensional paste-up display wall, multi-bench projectors are driven by Linux trunked system, two projectors are a group, and it is separately connected with two outputs of the same trunked node, the images projected by projectors are geometry corrected, marginal anabranched and color corrected by method of computer sight, the projected images are montaged to a uniform three-dimensional display image with high distinguishability and large scale. The invention proceeds seamless geometry correction and color correction based on software and decrease hardware cost greatly; the correction data can be obtained by method of computer sight to decrease the maintenance cost of the display wall greatly; besides, the number of projectors, display size and distinguishability can be configured flexibly according to specific demand, the large scale view can be real-time plotted by adding trunked node.
Description
Technical field
The present invention relates to be used for the installation bearing calibration of the large-scale 3 D display wall of scientific researches such as visual and virtual reality.
Background technology
Along with the development of shadow casting technique, set up high resolving power, the curtain splice displaying system (claiming projection wall again) of large screen display picture becomes the active demand of virtual reality and visualization technique development.
Modern data visualization (Data Visualization) technology refers to utilization computer graphics and image processing techniques, data is changed to figure or image shows on screen, and carries out theory, method and the technology of interaction process.An its important research content is to study how science data-numerical value and image to be changed into visual figure (image).Below be several important subject of current visual research:
1) medical image data is visual: the two-dimentional cross-sectional image that obtains relevant organ and tissue by CT, MRI and positron emission tomoscan means such as (PET), adopt its three-dimensional image of visual software system reconfiguration, for medical diagnosis and treatment provide foundation and guidance.
2) flow field visualization: the geometric model to complexity is found the solution, and calculates various parameters in the flow field at each numerical value constantly, utilize visualization technique on screen with Data Dynamic show.For example, express speed, pressure, temperature and the component etc. of every bit, and demonstrate eddy current, shock wave, shear layer, wake flow and turbulent flow etc. with multiple distinct methods.
3) brain structure and function thereof are visual: in the human brain research process, utilize visualization technique to assist and obtain data (CT and MR etc.), extraction feature (generating the tomograph and the functional diagram of brain according to experimental data) and carry out the mind map analysis, show with suitable three dimensional constitution.
In more than using, all need to handle a large amount of science data, conversion generates different figures (image) and shows for analyzing and research.Usually these resolution of using display device all have very high requirement, in the research of brain structure, the neuron of drawing human brain requires high resolution, in flow field visualization, to show the fine structure in flow field and the contour surface of various parameters realistically, some loss of resolution may cause losing of important information, even can cause the invalid of experimental result.
Pursuing color, the high-resolution display effect of beautiful super large picture, purity, always is a kind of latent demands of people to visual experience.It is not only scientific visualization, big foundation to commander Surveillance center, network management center, little carrying out to video conference, academic report, technology lecture and multi-functional meeting, serious hope to big picture, multicolour, high resolving power display effect is more and more stronger, the information that the separate unit display device can show can not satisfy people's demand far away, along with the continuous development and the innovation of projection display technique, higher resolution shows the active demand that becomes display system.
In order to satisfy the active demand of people to super large picture and high resolving power demonstration, along with the development of shadow casting technique, large-screen splicing display system (claiming projection wall again, Display Wall) is given birth at once.It has following characteristics: display area is big, and brick pattern splicing can reach tens, up to a hundred square metres, even bigger; Resolution height, sharpness height.Can and constantly add up along with the increase of splicing scale in theory.
Splice displaying system is by several low-resolution display devices (display or projector adopt projector herein) common big high resolution large screen display systems of forming that is stitched together independently.Very unfortunate, in the visual world, one-plus-one never equals two.We are on the airport, the coml spliced display wall that square and some shopping centers are seen or be exactly that resolution is too low, or be exactly that piece is too obvious, and these equipment costs are very expensive.Traditional geometric correction method is hardware corrected: for each projector all is equipped with a base with a plurality of adjusting degree of freedom, (comprise the position by manual each degree of freedom is regulated, angle etc.), make the vertical and projection screen of projecting direction of projector, and the adjacent projections instrument is tiled display correctly, and this is a very loaded down with trivial details and time-consuming job; And when the quantity of projector was big, this work is difficulty especially.Therefore this method generally only is used for the less occasion of number of projectors.
List of references:
[1]Hereld，M.，Judson，I.R.，and?Stevens，R.L.，2000，Introduction?to?buildingprojection-based?tiled?display?systems：Computer?Graphics?and?Applications，IEEE，v.20，p.22-28.
[2]Kai?Li，H.C.，et?al.，2000，Early?Experiences?and?Challenges?in?Building?andUsing?A?Scalable?Display?Wall?System：Computer?Graphics?and?Applications，v.20，p.29-37.
[3]Bin?Wei，Claudio?Silva?etc.，July/August?2000，Visualization?Research?withLarge?Displays：IEEE?Computer?Graphics?and?Applications，pp.51-54
[4]Yuqun?Chen，Douglas?W.Clark，etc.，Automatic?Alignment?OfHigh-Resolution?Multi-Projector?Displays?Using?An?Un-Calibrated?Camera：Department?of?Computer?Science，Princeton?University
[5]Kuan-Liu?Ma，July/August?2001，Large-Scale?Data?Visualization：IEEEComputer?Graphics?and?Applications，pp21-22
[6]G.Humphreys?and?P.Hanrahan，Oct.1999，A?Distributed?Graphics?System?forLarge?Tiled?Displays：Proc.IEEE?Visualization?1999，ACM?Press，New?York
Summary of the invention
The objective of the invention is to show low cost of structure, the bearing calibration of the large-scale 3 D spliced display wall of proofreading and correct based on computer vision is devoted to demonstration output with single standard resolution and is combined into seamless high resolving power and shows whole.
The installation bearing calibration of large-scale 3 D display wall of the present invention is characterized in that may further comprise the steps:
1) drives many projector that constitute display wall with the Linux group system, every computing machine of cluster as a node, according to InfiniBand architecture arrangement cluster network, and is each clustered node installation software corresponding with InfiniBand; For each clustered node is installed the video card with lose-lose outlet, and installation and video card corresponding driving program;
2) it is one group according to per two projector, one of them projector is labeled as odd number, another is labeled as even number, two projector link to each other with two delivery outlets of same clustered node respectively, adjust projector position, make every group of projector on curtain, cover identical zone, between the adjacent set projector overlay region is arranged; The starting of oscillation sheet is installed on all projector, is made odd number projector and even number projector starting of oscillation sheet launch two kinds of crossed polarized lights;
3) carry out the geometric correction of imagery with the method for computer vision, make many projector launch the image mosaic that comes and form the unified image of a width of cloth; The said geometric correction of imagery is: allow the projector projection that is all odd number or is all even number have the picture of feature pattern earlier, with the camera whole screen of taking pictures, comparison film carries out Flame Image Process, extract minutiae then; According to unique point, the utilization matrix theory calculates the mapping one by one between the point on video card frame buffer district and the projection screen again; At last, according to the mapping matrix that calculates, projective transformation is carried out in frame buffer;
4) image to projector projects carries out the edge fusion, eliminates the slit of adjacent projections instrument splicing place and crosses bright area; Merge said image border: according to its overlay region with the adjacent projections instrument, the mask that generation comprises the smooth treatment function accordingly merges the frame buffer district according to mask then to every projector;
5) carry out color of image with the method for computer vision and proofread and correct, reduce the colour difference between each projector;
Said color of image is proofreaied and correct: take pictures with digital camera and measure different projector when throwing the same brightness color, the intrinsic brilliance that is produced, R, G, three kinds of each umber of beats of color of B are opened, its brightness is respectively from 0.1～1.0, the photo that different brightness are taken is down handled then, obtain the color map table of every projector, again before every projector Projection Display, the colormap table of the XWindow of different screen is set, produce the mapping of a color value, the same a kind of color that makes different projector projects go out is similar as far as possible.
Among the present invention, the said geometric correction of imagery is to allow the projector projection that is all odd number or is all even number have the picture of feature pattern earlier, and with the camera whole screen of taking pictures, comparison film carries out Flame Image Process, extract minutiae then; According to unique point, the utilization matrix theory calculates the mapping one by one between the point on video card frame buffer district and the projection screen again; At last, according to the mapping matrix that calculates, projective transformation is carried out in frame buffer.
Among the present invention, said image border merge be to every projector according to its overlay region with the adjacent projections instrument, the mask that generation comprises the smooth treatment function accordingly merges the frame buffer district according to mask then.
Bearing calibration of the present invention, the back side that projector is installed in curtain are for well, and curtain can adopt the soft curtain of the rear-projection of optical screen.
Among the present invention, said projector can adopt the LCD projector.
Beneficial effect of the present invention is:
1. carry out seamless geometry and colour correction based on software, greatly reduce hardware cost.
2. carry out correction data based on computer vision and obtain, greatly reduce the display wall maintenance cost.
3. can be according to real needs flexible configuration number of projectors, display size and resolution.
4. can draw node by adding cluster, realize the large scale scene real-time rendering.
Description of drawings
Fig. 1 is the Organization Chart of the large-scale 3 D spliced display wall of employing the inventive method;
Fig. 2 is the perspective view of every group of two projector.
Embodiment
Microcomputer cluster
The large screen display wall uses the parallel drawing technology, adopts many projector to replace original separate unit projector and makes the display screen increase be corresponding multiple; Each projector is driven by independent computing machine, and sharing of calculation task makes display speed also improve greatly.Simultaneously, in the real-time graphic presentation, a large amount of network data transmission is arranged between each computing machine, it is a kind of inevitable to make that big bandwidth, the low network transmission system that postpones replace common LAN (Local Area Network) to become, this also is the main foundation that we select microcomputer cluster, replace common Ethernet card with express network in the cluster, thereby improved network transfer speeds greatly.
Projection pattern
Projection has just throws and two kinds of different modes of rear-projection, and what is called is just thrown, and is exactly the front that the position of projector is installed in display screen, and with spectators' homonymy, the ray cast that projector sends forms image to screen on screen, reflex to people's eyes again; Projector is installed in the back side of screen under the rear-projection mode, and projector and spectators lay respectively at the front and back of screen, and to screen, light sees through screen and enters spectators' eyes the light that projector sends from the rear direct projection of screen.
With respect to just throwing, it is narrower and need take the characteristics of certain space behind at screen that rear-projection has the visual angle, but all be better than just throwing at the aspects such as interference, display effect and user friendliness of antagonism surround lighting, therefore selects for use the rear-projection mode for well.
Curtain
The rear-projection curtain that the rear-projection mode adopts has the branch of soft curtain and hard curtain on material.Soft curtain has relatively inexpensive, seamless (size can customize), easy transportation and installation advantages such as (can fold).Thereby the shortcoming of soft curtain is a stability is subjected to the influence of temperature, humidity and air-flow to cause rocking of image easily, and durability is relatively poor.By comparison, the hard curtain life-span is long, good stability, but cost an arm and a leg, fixed size and transportation and installation are not too convenient.
Divide from optical texture, the rear-projection curtain has two kinds, and a kind of is the diffuse reflection screen, and a kind of is optical screen, their display effect difference.The diffuse reflection screen is common a transparent offset plate or a glassy layer, and the inside has added diffuse-reflective material.Its light of the image of diffuse reflection screen display is not to send to spectators equably in the eyes, but disperses to all directions brokenly, and solar effect is very serious, and the corner is darker.Optical screen absorbs from sending to spectators behind the light of projector equably.Light distribute the fifty-fifty center and the corner of screen.Wherein, optics rear-projection curtain relies on fine optical facilities to finish the distribution of projection luminous energy, is to generally acknowledge the best display mode of effect at present.
Comprehensive above two factors, selection adopt the soft curtain of the rear-projection of optical screen.
Projector
The projector major technique has CRT (Cathode Ray Tube, cathode-ray tube (CRT)), LCD (LiquidCrystal Display, LCD) and DLP (Digital Light Processor, digital light path processor) three major types type.
Because projection wall must adopt light and handy portable projector, and price must be cheap relatively, so at first get rid of stable performance but very heavy CRT projector.Next required just LCD projector and DLP projector being compared and select of doing.Contrast two kinds of products, the DLP projector is lightly portable, the contrast height, and black white image is clear sharp keen, dark portion levels are rich, the details performance is abundant, and image quality is stable.LCD projector image color saturation is good, than DLP projector more energy-conservation (power is low), but all will be inferior to DLP aspect the homogeneity of contrast and brightness.On the whole, the display quality of DLP projector is better than the LCD projector.But on the one hand because the huge price advantage of LCD projector on the other hand, considers that the parameter of LCD each side has reached required requirement in this concrete application, so select the LCD projector.
Passive solid
What passive stereo projection display was commonly used is polarized-light technique.Use the display device of this technology must be furnished with the starting of oscillation sheet, launch two kinds of crossed polarized lights, the light of promptly parallel and vertical vibration by the display device of being furnished with the starting of oscillation sheet.The starting of oscillation sheet is installed in employing on all projector, make odd number projector and even number projector starting of oscillation sheet launch two kinds of crossed polarized lights; The user wears polarised light glasses, and two light of seeing different directions vibration are respectively seen not the image of projector projects on the same group respectively, thereby produced stereoeffect.Here, employing is based on the passive solid of polarized light piece.
Geometry correction
For the projection wall system that shows by many projector splicings, the problem of a very crucial and necessary solution is: the position of how to proofread and correct every projector, angle, make all projector can both project to correct rectangular area, guarantee that all Projection Display zones can be stitched together one by one, form seamless, a single in logic display device;
Adopt following geometric correction method: the curtain that is used for projection is carried out in logic division, it is divided into the identical piecemeal of size, each projector is responsible for showing wherein one, as long as the display image correcting of every projector is arrived in the corresponding rectangular area, just can realize the correct splicing of display image.Do making being evenly distributed of projected image attractive in appearance like this, make simultaneously to show that respectively the drafting task of node tends to balance.
Proofread and correct, need know projector epigraph dot matrix (being the original image in the frame buffer on the clustered node) and render to the mapping relations between the correspondence image dot matrix of back on the display screen.Suppose projection process without any warp, and the surface of projection screen is a plane, can regard linear transformation as between original image and camera image, projected image and the camera image in the frame buffer so, use 3 * 3 Matrix C and T to represent respectively, represent mapping between original image and the projected image with P, then:
P=C ' T (C ' expression C inverse matrix) (1)
Because C and T are 3 * 3 matrixes, then P also is 3 * 3 matrix.If draw with traditional three-dimensional graphics pipeline, P can expand to one 4 * 4 matrix so, it is connected with the view projection matrix image is carried out pre-conversion, can generate correct stitching image, and this is without any need for extra calculation cost.
By formula (1), as can be seen, as long as obtain Matrix C and T, just can try to achieve in the frame buffer the P that concerns between the image and projected image, and C and T can take pictures by projective tests image and camera and calculate acquisition.
For image coordinate in the corresponding frame buffer zone of every projector and the image overall coordinate on the projection screen are set up mapping one by one, take pictures by digital camera and obtain a group of feature point, shine upon then.But, because camera is taken the influence that is subjected to various parameters and environment, make picture shot and practical situation to be very different, the power of illumination is thrown in the color of picture, the precision that shape all can have influence on feature point extraction.In the bearing calibration, the circle that uses one group of green is as unique point, and every projector these unique points of projection are successively taken projection screen by digital camera then, obtain the image of unique point on projection screen of every projector projects.Obtain 3 * 3 mapping matrix, need four group of feature point at least, so we need four circles at least; In the process of calculating mapping matrix, adopt least square method to simulate, more data can improve the precision of proofreading and correct the result.
After obtaining the projection properties grid of every projector, also need global characteristics grid on this projection screen and the feature grid in the frame buffer zone own are set up mapping one by one.Because the influence of surround lighting and the inexactness of digital camera itself, might cause the image characteristic point of clapping not obvious, so before carrying out feature point extraction, need do Flame Image Process earlier.Common way is image to be carried out binaryzation be converted into gray-scale map on the Flame Image Process, because the circle of projection is green, so can come image is carried out binaryzation according to the difference of G value in the rgb value.
Be subjected to shooting environmental and influence camera parameter, the photo of discharge has very big difference, and carry out the selected threshold values of correct binaryzation may be different, and program will remove to attempt selecting correct threshold values automatically.
After obtaining the binary conversion treatment result images, need all border circular areas among the figure are converted to the point value coordinate, conveniently to set up the mapping one by one between frame buffer zone and the projection screen world coordinates.But, because the limitation of camera resolution and precision, might cause each border circular areas in the feature grid of binaryzation is not accurate circle, circle must have certain fault-tolerance to the transfer algorithm of point, and the mean center point of getting border circular areas is a reasonable selection as eigenwert.
After having obtained every unique point on the projector test picture, just can be in the hope of mapping matrix, thus carry out matrixing.In the calculating of transformation matrix P, establish xi, yi), (Xi, Yi) } be the point set of setting up behind the extract minutiae of mapping one by one, then according to linear algebra knowledge, we just can obtain P.After obtaining P, on screen, obtain view field, just can obtain the correspondence position of each summit in frame buffer, during drafting, only need the image in the frame buffer is carried out conversion, on screen, just can obtain correct splicing figure.
The edge merges
Even the result of geometry correction is very accurate, inconsistent between projector on the color still can make the transition of splicing place produce saltus step and since in the brightness lofty excessively, splicing place slit can be fairly obvious.And in fact owing to the error of computational accuracy, the splicing on the geometry generally has the deviation of 1-2 pixel, and small slit or overlapping may appear in splicing place.It is exactly for fear of these saltus steps that the edge merges, and adjacent screen overlay district is shown simultaneously, but can cause the highlighted of overlay region like this, so need merge the brightness of overlay region, can regard a unified screen as after the feasible splicing.
Merge in order to carry out the edge, for each projector is provided with a mask (alpha mask) that comprises the smooth treatment function, the weight that the corresponding display image of the picture element value representation of alpha mask merges, 1 (white) expression shows fully, 0 (black) expression do not show, 0.5 expression shows with the brightness value of half.When carrying out image rendering, former figure and alpha mask are merged, just can realize seamlessly transitting between projector in the overlapping region.
With about the overlay region of two projector be example, (pixel) M a bit in the R of overlapping region, with the left hand edge of R distance be d1, with the right hand edge of R distance be d2, the same for the brightness that makes this point with the brightness in the Non-overlapping Domain, should equal brightness in the Non-overlapping Domain in the brightness sum of two projector of this some contribution.In order to make projected image seem level and smooth natural, this edge apart from which projector in R is near more, then the light intensity of this projector contribution should be low more, if the light intensity that left projector should be contributed is Lleft, the light intensity that right projector should be contributed is Lright, the light intensity in non-overlapped district is L, then can obtain following equation:
L＝L
left+L
right (2)
But since colouring information be transferred to projector projects and go out after through a non-linear conversion, the light intensity of demonstration and voltage are a kind of relations of power function, the index in these power functions is referred to as gamma; And the intensity of voltage and primitive color is linear dependence.Therefore, when asking fusion weight alpha mask, after application formula (2) is found the solution, also should do an extra gamma inverse transformation again, could make the light intensity of throwing in the overlapping region and in the Non-overlapping Domain, equate like this.After Alpha mask has had, can carry out the edge with the glBlendFunc function among the OpenGL and merge.
Color correction
Different projector is when the projection same color, because the difference of physical optics attribute can produce misalignment, mainly contains colour difference and luminance difference: the former refers to when the projection same color, different projector can be mingled with other colors to some extent, makes this look not " pure "; The latter refers to that different projector can produce different brightness when projection same brightness color, and is bright partially or dark partially.More than both can cause visual inconsistency, thereby introduced color correction.
In order to carry out color correction, need R to projector, G, three passages of B are proofreaied and correct respectively, thereby reduce heterochromia.At first, take pictures with digital camera and to measure different projector when the projection same brightness color, the intrinsic brilliance that is produced, R, G, three kinds of colors of B are respectively clapped ten, and its brightness is respectively from 0.1～1.0 (1.0 is high-high brightness).For making different brightness can both shoot clearly image, the time shutter of camera need manually be set, and it is noted, use in order to program afterwards.Secondly, owing to adopted the different time shutter when taking the varying strength photo, the photo of generation can not directly compare pixel value, but need convert real brightness value to by pixel value.Be that real brightness value is about pixel value and the function of current photo lithography time, this function is the physical attribute of a camera, and the photo by a series of different exposure values of sampling comes this function of match.Then,, the photo that different brightness are taken is down handled, obtained the color map table of every projector by Flame Image Process.At last, before every projector Projection Display, the colormap table of the XWindow of different screen is set, the mapping that produces a color value makes that the color that projects is similar as far as possible.
The present invention is further illustrated below in conjunction with accompanying drawing and by example:
Large-scale 3 D spliced display wall shown in Figure 1 is formed (only having drawn 8 nodes among the figure) by 18 projector 2 of microcomputer cluster 1 driving of 10 nodes, its projected area is approximately 2.5m * 2.2m, resolution is 3000 * 2000 pixels, and wherein curtain 3 has been selected the soft curtain of film screen rear-projection of U.S. Stewart company imported with original packaging.Projector adopts the LCD projector of EPSON EMP-74, and it has high brightness (reaching 2000 lumens), and the RS485 control interface is arranged, so that control array of rear-projectors by software; Video card adopts the Geforce FX5200 with dual output passage, like this can so that every group of projector control by a clustered node.Earlier these 18 projector are divided into 9 groups, every group of two projector, two projector link to each other with two delivery outlets of same node respectively, put the polaroid 4 (as shown in Figure 2) that direction differs 90 degree two projector fronts, and the adjusting projecting direction, make every group of projector throw same area on curtain; And between the adjacent set projector overlay region to be arranged.
Behind the good whole hardware system of layout, at first, according to InfiniBand architecture arrangement cluster network, and be that each clustered node installs the software corresponding with InfiniBand, simultaneously, in order to make the video card operation good performance can be arranged the time, for every video card is installed corresponding video card driver.
Next, method with computer vision is carried out the geometric correction of imagery, at first projection goes out identical 7 * 7 round system of battle formations sheet on each projector, take pictures with camera then, and comparison film carries out Flame Image Process, extract unique point, use matrix theory then, calculate image in the frame buffer and the mapping between the projected image by these unique points, then according to these mapping relations, image in the frame buffer is carried out corresponding conversion, just can finish geometry correction.
Then, image to projector projects carries out the edge fusion, different according to every projector and adjacent projections instrument overlay region on every side, for they generate the corresponding mask that comprises the smooth treatment function, and the image that these masks are mapped in the frame buffer district gets on, splicing place of adjacent projections instrument is realized a smooth transition, and slit or too highlighted situation can not occur.
At last, carry out color of image with the method for computer vision and proofread and correct, to the R of projector, G, three passages of B are proofreaied and correct respectively, thereby reduce heterochromia.At first, take pictures with digital camera and to measure different projector when the projection same brightness color, the intrinsic brilliance that is produced, R, G, three kinds of colors of B are respectively clapped ten, and its brightness is respectively from 0.1～1.0 (1.0 is high-high brightness).Then,, the photo that different brightness are taken is down handled, obtained the color map table of every projector by Flame Image Process.At last, before every projector Projection Display, the colormap table of the XWindow of different screen is set, the mapping that produces a color value makes that the color that projects is similar as far as possible.
Claims (4)
1. the bearing calibration of large-scale 3 D spliced display wall is characterized in that may further comprise the steps:
1) drives many projector that constitute display wall with the Linux group system, every computing machine of cluster as a node, according to InfiniBand architecture arrangement cluster network, and is each clustered node installation software corresponding with InfiniBand; For each clustered node is installed the video card with lose-lose outlet, and installation and video card corresponding driving program;
2) it is one group according to per two projector, one of them projector is labeled as odd number, another is labeled as even number, two projector link to each other with two delivery outlets of same clustered node respectively, adjust projector position, make every group of projector on curtain, cover identical zone, between the adjacent set projector overlay region is arranged; The starting of oscillation sheet is installed on all projector, is made odd number projector and even number projector starting of oscillation sheet launch two kinds of crossed polarized lights;
3) carry out the geometric correction of imagery with the method for computer vision, make many projector launch the image mosaic that comes and form the unified image of a width of cloth; The said geometric correction of imagery is: allow the projector projection that is all odd number or is all even number have the picture of feature pattern earlier, with the camera whole screen of taking pictures, comparison film carries out Flame Image Process, extract minutiae then; According to unique point, the utilization matrix theory calculates the mapping one by one between the point on video card frame buffer district and the projection screen again; At last, according to the mapping matrix that calculates, projective transformation is carried out in frame buffer;
4) image to projector projects carries out the edge fusion, eliminates the slit of adjacent projections instrument splicing place and crosses bright area; Merge said image border: according to its overlay region with the adjacent projections instrument, the mask that generation comprises the smooth treatment function accordingly merges the frame buffer district according to mask then to every projector;
5) carry out color of image with the method for computer vision and proofread and correct, reduce the colour difference between each projector;
Said color of image is proofreaied and correct: take pictures with digital camera and measure different projector when throwing the same brightness color, the intrinsic brilliance that is produced, R, G, three kinds of each umber of beats of color of B are opened, its brightness is respectively from 0.1～1.0, the photo that different brightness are taken is down handled then, obtain the color map table of every projector, again before every projector Projection Display, the colormap table of the XWindow of different screen is set, produce the mapping of a color value, the same a kind of color that makes different projector projects go out is similar as far as possible.
2. the bearing calibration of large-scale 3 D spliced display wall according to claim 1 is characterized in that projector is installed in the back side of curtain.
3. the bearing calibration of large-scale 3 D spliced display wall according to claim 2 is characterized in that curtain is the soft curtain of rear-projection of optical screen.
4. the bearing calibration of large-scale 3 D spliced display wall according to claim 1 is characterized in that projector is the LCD projector.
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