CN103869587B - For the naked output calibration steps looking real three-dimensional display system of many viewpoints - Google Patents

Abstract

The invention discloses a kind of for the naked output calibration steps looking real three-dimensional display system of many viewpoints, implementation step is as follows: arrange light sensor at side two ends, standard viewing area, selects current projector; Only open current projector and regulate that current projector central point aligns with standard viewing area central point, view field is greater than standard viewing area; Initialization content output window, makes to overlap between content output window and standard viewing area by the medial movement of four summits of described content output window toward content output window successively in black background; Judge whether that all projector have all been calibrated complete, if not yet all calibration is complete, select the still unregulated projector in next road to recalibrate as current projector to be calibrated; Otherwise end task and exit.The present invention has that degree of regulation is high, it is little to disturb between the video of strong adaptability, hardware spending little, each road, it is faster, easy to use to regulate, manpower and the little advantage of time loss.

Description

For the naked output calibration steps looking real three-dimensional display system of many viewpoints

Technical field

The present invention relates to the naked collimation technique looking true 3-D display of many viewpoints, be specifically related to a kind of for the naked output calibration steps looking real three-dimensional display system of many viewpoints.

Background technology

True three-dimension display technlolgies and two-dimentional display technique and dimension display technologies have difference in essence.True 3-D display is the display technique of a kind of Existential Space 3 d light fields distribution.Each pixel in true 3-D display has three-dimensional character, and its position can use three dimensional space coordinate (x, y, z) to represent; Naked depending on referring to that observer does not need to wear any utility appliance (as anaglyph spectacles, the helmet etc.), just can observe the not ipsilateral of observed scene from different directions; True color display can demonstrate the shades of colour of object truly; Three-dimension dynamical display technology can show continually varying three-dimensional world in time, as taking off and descent of aircraft, and static three-dimensional display technique can only show static three-dimensional body, as being parked in aircraft on airport, the landform in battlefield and landforms, earth's surface building etc.

Be different from other dimension display technologies, true three-dimension display technlolgies have employed the mode based on reconstruction of optical wave field, obtains gathering light field by video camera array, exports reproduction light field afterwards through process by projected array.In collection link, from the light on object plane through video camera array (m=1,2,3 ... M; N=1,2,3 ... N, M are video camera array laterally numbering, and N is video camera array longitudinally numbering) on its focal plane, have recorded the spatial spectral information of light after conversion.The dimensional orientation of the lens unit optical axis of each video camera is unique, and the object light intensity distributed intelligence of recording is relevant with dimensional orientation, focal plane have recorded the light distribution observing object gained from different azimuth.In display link, the projected array of light distribution information by another group correspondence gathering the different azimuth that lens arra focal plane obtains (m=1,2,3 ... M; N=1,2,3 ... N, M is projected array laterally numbering, and N is projected array longitudinally numbering) export, utilize optical screen to form the optical field distribution basically identical with the original, by wavefront healing, realize the reproduction of image, make observer see true three-dimensional colour real-time dynamic display.3 d light fields distribution function f (x, y, the z of a certain spectral components in thing surface; T) describe, then have formula (1) according to the Fourier transform of three dimensions function and RSD theory of diffraction.

$F(f_x,f_y,f_z;t)=\∫\underset{-\∞}{\overset{+\∞}{\∫}}\∫f(x,y,z;t)\exp [-j2\mathrm{\π}(f_{x}x+f_{y}y+f_{z}z)]\mathrm{dxdydz}$ （1）

$f(x,y,z;t)=\∫\underset{-\∞}{\overset{+\∞}{\∫}}\∫F(f_x,f_y,f_z;t)\exp [-j2\mathrm{\π}(f_{x}x+f_{y}y+f_{z}z)]{\mathrm{df}}_x{\mathrm{df}}_y{\mathrm{df}}_z$

In formula (1), F (f _x, f _y, f _z; T) be object space spectrum distribution, j is imaginary symbols, f _xfor light intensity in the x direction, f _yfor light intensity in y-direction, f _zfor light intensity in a z-direction, x, y, z is three direction coordinates of three-dimensional system of coordinate, and t is the time.

The reproduction of display link is the inverse process of record, and display link is made up of M × N number of projecting cell and optical screen, and M × N number of projecting cell will gather the information transmission of lens unit record on optical screen, and generation spatial frequency is (-f _x,-f _y) output light, the light of each group spatial frequency superpose in the image space, right of projected array, the light also non-coherent addition of all different wave lengths, produces and the optical field distribution of discretize that the original is basically identical.Optical screen has vertical direction extended corner 120 °, the characteristic that horizontal direction extended corner is 1 °, and each projection ray effectively can complete the reconstruct of light field after the process of optical screen, realizes true 3-D display at the other end of screen.

As shown in Figure 1, light field according to true 3-D display builds principle, projector distribution in the same horizontal line, there is certain distance each other, project to the optical screen at center from different directions, light reproduces original spatial light field at the opposite side of screen after the process of optical screen, and spectators can see complete true 3-D display effect, and the accuracy of projection ray serves very important effect to three-dimensional reproduction.When projector projects, in order to the reconstruct realizing light field makes display light field identical with collection light field, the graphics display area of projection should be optical screen region, but all there is skew because projector is projected to screen by different directions in all directions, be projected in close together project the light diffusion come be less than comparatively far away while diffusion, the width on the image both sides cast out is different, and the display of figure exists the problem of trapezoidal deformation.

As shown in Figure 2, the image that in the trapezoidal deformation map existed during the projector projects of real three-dimensional display system, multiple projector projects goes out is as shown in dotted line frame portion, and standard viewing area is then as shown in black frame portion in figure.Because projector projects from different directions to screen, the incident angle of light has very large difference, trapezoidal deformation can be there is in the diverse location of same image in the region projected, view field can not overlap with the screen area of standard, now destroy the condition that true 3 d light fields is rebuild, need the calibration carrying out view field, make each unit of array of rear-projectors all project the region of optical screen demarcation, make display light field consistent with collection light field.Therefore how carrying out calibration to the image of projector projects makes it project criteria section, makes the light field of true 3-D display to complete reconstruct, is the problem that real three-dimensional display system must solve.

The method of prior art comprises digital keystone and optics keystone, numeral keystone is the trapezoid correction function that projector itself carries, but its trapezoid correction function is weak, the problem on deformation of complicated direction projection cannot be solved, what regulate is range limited, and the low precision regulated, the demand of the true 3-D display of many viewpoints cannot be met.Optics keystone refers to that the physical location by adjusting camera lens makes to throw in light beam and the reverse convergent-divergent of projector's riding position of image, thus reach the object of keystone, the technology realized comprises camera lens and directly adjusts and carry out calibration realization by projector rack being located on accurate optics The Cloud Terrace, by the height of The Cloud Terrace adjustment projector, the mode of horizontal-shift and the angle of pitch regulates, but the instrument that this regulative mode expends is a lot, the difficulty reaching certain calibration accuracy is high, the time expended is long, for many viewpoint displays, the number of projector is a lot, the time regulated one by one, the expense of equipment and manpower is all very large.Therefore, how designing efficient, low consumed calibration system is the problem that many viewpoint real three-dimensional display systems need solution badly.

Summary of the invention

The technical problem to be solved in the present invention is to provide that a kind of degree of regulation is high, it is little to disturb between the video of strong adaptability, hardware spending little, each road, it is faster, easy to use to regulate, manpower and time loss little for the naked output calibration steps looking real three-dimensional display system of many viewpoints.

In order to solve the problems of the technologies described above, the technical solution used in the present invention is:

For the naked output calibration steps looking real three-dimensional display system of many viewpoints, implementation step is as follows:

1) arrange that at the two ends of each side of standard viewing area of optical screen one for detecting the light sensor with or without projector light, selects a road projector as current projector respectively;

2) open current projector close other projector, regulate that the central point of current projector view field aligns with the central point of described standard viewing area, the view field of current projector is greater than described standard viewing area;

3) the content output window of the corresponding Controlling vertex of initialization current projector, exported by current projector in black background by described content output window, now all light sensors all return the detection signal of projector light; Successively by the medial movement of four summits of described content output window toward content output window in black background, the detection signal that two light sensors adjacent according to each summit in described four summits are passed back overlaps between content output window and standard viewing area from there being projector light to become without described in projector light line traffic control;

4) judge whether that all projector have all been calibrated complete, if not yet all calibration is complete, select the still unregulated projector in next road as current projector and redirect execution step 2); Otherwise end task and exit.

The naked further improvement looking the output calibration steps of real three-dimensional display system of many viewpoints is used for as the present invention:

The detailed step of described step 3) is as follows:

3.1) the content output window of the corresponding Controlling vertex of initialization current projector, exported by current projector in black background by described content output window, now all light sensors all return the detection signal of projector light; For plane right-angle coordinate is set up on four summits of described content output window, make one in two of each vertex correspondence light sensors to be positioned in x-axis, another is positioned in y-axis, select a summit as current vertex, redirect performs next step;

3.2) detection signal that two light sensors corresponding to current vertex is passed back is obtained, if the detection signal that described two light sensors are passed back has been projector light, then the x-axis coordinate of current vertex and y-axis coordinate are specified unit toward the medial movement one of content output window respectively, return and re-execute step 3.2); If be only positioned at detection signal that the light sensor in x-axis passes back in described two light sensors for there being projector light, then only the x-axis coordinate of current vertex specified unit toward the medial movement one of content output window, return and re-execute step 3.2); If be only positioned at detection signal that the light sensor in y-axis passes back in described two light sensors for there being projector light, then only the y-axis coordinate of current vertex specified unit toward the medial movement one of content output window, return and re-execute step 3.2); If the detection signal that described two light sensors are passed back is without projector light, then judge that the summit that current vertex is corresponding with standard viewing area overlaps, whether all summits detecting described content output window all regulate complete, if not yet all regulate complete, selects a unadjusted summit as current vertex to be regulated and returns to re-execute step 3.2), if all adjustment is complete, select a summit of described content output window as current vertex to be verified and redirect performs next step;

3.3) the x-axis coordinate of current vertex and y-axis coordinate are moved respectively one toward the outside of content output window and specify unit, if the detection signal that two light sensors that current vertex is corresponding are passed back has projector light by changing into without projector light, then judge that current vertex is verified, select the not verified summit of the next one in described content output window as current vertex to be verified and re-execute step 3.3) carry out summit checking until all summits of content output window are all verified, then overlap between content output window and standard viewing area after all summits are all verified, current projector calibration is complete and redirect performs step 4), otherwise judge current vertex checking do not pass through, using current vertex as current vertex to be regulated and redirect perform step 3.2) carry out summit adjustment.

The present invention is used for the naked output calibration steps depending on real three-dimensional display system of many viewpoints and has following advantage:

1, the present invention is first by view field that the simple device comprising The Cloud Terrace etc. is determined roughly, then combined by light sensor and projector calibration is carried out to the mode of the software and hardware combining that the summit of content output window in black background regulates, the drop shadow spread of accurate control video, accurately control view field, reach the effect that many viewpoints all project the same position of same screen, solve the problem of the trapezoidal deformation that projector angles brings, there is high, the adaptable advantage of degree of regulation.

2, the present invention arranges respectively that at the two ends of each side of standard viewing area of optical screen one for detecting the light sensor with or without projector light, a small amount of sensor is used to assist, do not need to use complicated adjustment sensing plate, the shape adjustment to content output window can be realized, the view field determined is accurate, hinge structure and optics keystone mode needs every road video configuration accurate The Cloud Terrace, has the advantage that hardware spending is little.

3, the present invention coordinates by regulating by road projector, integrating step 2) coarse adjustment and step 3) content output window regulate, interference between the video of each road is little, substantially the interference of physical space is there is not during adjustment, regulate rapidly, the human resources taken are few, manpower when greatly reducing calibration and time loss.

Accompanying drawing explanation

Fig. 1 is the naked projector distribution array schematic diagram looking real three-dimensional display system of the many viewpoints of prior art.

The trapezoidal deformation schematic diagram of Fig. 2 when to be that the many viewpoints of prior art are naked look the projector projects of real three-dimensional display system.

Fig. 3 is the method flow schematic diagram of the embodiment of the present invention.

Fig. 4 is the layout schematic diagram of light sensor in the embodiment of the present invention.

Fig. 5 regulates the view field that obtains and standard viewing area to contrast schematic diagram by The Cloud Terrace to projector in the embodiment of the present invention.

Fig. 6 is the detailed process schematic diagram of step 3) in the embodiment of the present invention.

Fig. 7 is to the contrast schematic diagram before and after the adjustment of content output window in the embodiment of the present invention.

Embodiment

As shown in Figure 3, to be used for the naked implementation step of looking the output calibration steps of real three-dimensional display system of many viewpoints as follows for the present embodiment:

1) arrange that at the two ends of each side of standard viewing area of optical screen one for detecting the light sensor with or without projector light, selects a road projector as current projector respectively.

The naked optical screen depending on real three-dimensional display system of many viewpoints adopts optical thin film to be made, real three-dimensional display system is looked for many viewpoints of embody rule are naked, the size of its optical screen have passed through design and produces stationary installation, and optical screen can be determined the naked standard viewing area looking real three-dimensional display system of many viewpoints.As shown in Figure 4, by arranging that one for detecting the light sensor with or without projector light respectively at the two ends of each side of standard viewing area in the present embodiment, light sensor connects the naked control end looking real three-dimensional display system of many viewpoints, make light sensor detection signal (with or without projector light) can be imported into the naked control end looking real three-dimensional display system of many viewpoints, can define by light sensor the position that projector projects region should be calibrated to.In the present embodiment, light sensor implement body adopts photoresistance, by the light and shade sensitive of photoresistance to light, effectively can distinguish and whether have the direct projection of projector light to light sensor region, thus output has projector light signal or the detection signal without projector light signal, thus realize the border of standard viewing area and the location on summit.In addition, light sensor can also adopt linear pattern sensor as required, and the diverse location of linear pattern sensor all can pass transducing signal back respectively, equally also can realize the location on border to standard viewing area and summit.

2) open current projector close other projector, regulate that the central point of current projector view field aligns with the central point of standard viewing area, the view field of current projector is greater than standard viewing area.

Specifically refer in the present embodiment that the central point of the The Cloud Terrace adjustment current projector view field by projector aligns with the central point of standard viewing area, the view field of current projector is greater than standard viewing area.The The Cloud Terrace degree of regulation of projector requires low, the adjustment of simple view field can be carried out with The Cloud Terrace time initial, view field is moved to the surrounding of standard viewing area, the view field of current projector is made to be a bit larger tham standard viewing area, and the central point of the projected centre point of current projector with standard viewing area is alignd, fix The Cloud Terrace afterwards, projection hardware is fixed physically, and projecting direction can not change.

As shown in Figure 5, the inside casing in figure is the standard viewing area of rectangle, and the housing in figure is the view field of current projector, and carrying out the governing loop of simple view field with The Cloud Terrace, the view field of current projector is a bit larger tham standard viewing area.Due to carried out simple view field by The Cloud Terrace adjustment after, view field fails to overlap with standard viewing area, need to carry out exporting adjustment further to correct the content output window in view field, the content output window in view field is corrected to and overlaps with standard viewing area.

3) the content output window of the corresponding Controlling vertex of initialization current projector, exported by current projector in black background by content output window, now all light sensors all return the detection signal of projector light; Successively by the medial movement of four of content output window summits toward content output window in black background, the detection signal that two light sensors adjacent according to each summit in four summits are passed back overlaps from there being projector light to become without between projector light line traffic control content output window and standard viewing area.

As shown in Figure 6, in the present embodiment, the detailed step of step 3) is as follows:

3.1) the content output window of the corresponding Controlling vertex of initialization current projector, exported by current projector in black background by content output window, now all light sensors all return the detection signal of projector light; For plane right-angle coordinate is set up on four summits of content output window, make one in two of each vertex correspondence light sensors to be positioned in x-axis, another is positioned in y-axis, select a summit as current vertex, redirect performs next step.

As shown in Figure 7, the housing in figure is original content output window, and original content output window is the rectangle of standard, can determine that the coordinate on its four summits is (x1, y1), (x2, y2), (x3, y3), (x4, y4).See Fig. 4, summit (x1, y1) two corresponding light sensor A and light sensor B, wherein, light sensor A is positioned at (x1, y1), (x2, in the y-axis at y2) place, light sensor B is positioned in the x-axis at (x1, y1), (x3, y3) place.

3.2) detection signal that two light sensors corresponding to current vertex is passed back is obtained, if the detection signal that two light sensors are passed back has been projector light, then the x-axis coordinate of current vertex and y-axis coordinate are specified unit toward the medial movement one of content output window respectively, return and re-execute step 3.2); If be only positioned at detection signal that the light sensor in x-axis passes back in two light sensors for there being projector light, then only the x-axis coordinate of current vertex specified unit toward the medial movement one of content output window, return and re-execute step 3.2); If be only positioned at detection signal that the light sensor in y-axis passes back in two light sensors for there being projector light, then only the y-axis coordinate of current vertex specified unit toward the medial movement one of content output window, return and re-execute step 3.2); If the detection signal that two light sensors are passed back is without projector light, then judge that the summit that current vertex is corresponding with standard viewing area overlaps, whether all summits of Detection of content output window all regulate complete, if not yet all regulate complete, select a unadjusted summit as current vertex to be regulated and return to re-execute step 3.2), if all regulate complete, a summit of chosen content output window is as current vertex to be verified and redirect performs next step.

3.3) the x-axis coordinate of current vertex and y-axis coordinate are moved respectively one toward the outside of content output window and specify unit, if the detection signal that two light sensors that current vertex is corresponding are passed back has projector light by changing into without projector light, then judge that current vertex is verified, the not verified summit of the next one in chosen content output window is as current vertex to be verified and re-execute step 3.3) carry out summit checking until all summits of content output window are all verified, then overlap between content output window and standard viewing area after all summits are all verified, current projector calibration is complete and redirect performs step 4), otherwise judge current vertex checking do not pass through, using current vertex as current vertex to be regulated and redirect perform step 3.2) carry out summit adjustment.

As shown in Figure 7, housing in figure is original content output window, original content output window is the rectangle of standard, can determine that the coordinate on its four summits is (x1, y1), (x2, y2), (x3, y3), (x4, y4), by aforesaid step 3.1) ~ 3.3) respectively by the x-axis coordinate on summit and y-axis coordinate respectively after the medial movement of content output window, then content output window can reduce, the coordinate on four summits changes to (x1 ', y1 '), (x2 ', y2 '), (x3 ', y3 '), (x4 ', y4 '), the projection output area that content output window is corresponding can reduce equally, meanwhile, owing to content output window being exported by current projector in black background in the present embodiment, therefore the content output window after reducing and the region (in Fig. 6 fill area) between original contents output window are projected as black after calibrating, because black can be considered as without projection ray by light sensor, thus the calibration on the summit to content output window can be realized, thus four of the view field of content output window summits are overlapped with four summits of standard viewing area respectively, realize calibrating the output of current projector.

4) judge whether that all projector have all been calibrated complete, if not yet all calibration is complete, select the still unregulated projector in next road as current projector and redirect execution step 2); Otherwise end task and exit.

The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (1)

1., for the naked output calibration steps looking real three-dimensional display system of many viewpoints, it is characterized in that implementation step is as follows:

1) arrange that at the two ends of each side of standard viewing area of optical screen one for detecting the light sensor with or without projector light, selects a road projector as current projector respectively;

2) open current projector close other projector, regulate that the central point of current projector view field aligns with the central point of described standard viewing area, the view field of current projector is greater than described standard viewing area;

3) the content output window of the corresponding Controlling vertex of initialization current projector, exported by current projector in black background by described content output window, now all light sensors all return the detection signal of projector light; Successively by the medial movement of four summits of described content output window toward content output window in black background, the detection signal that two light sensors adjacent according to each summit in described four summits are passed back overlaps between content output window and standard viewing area from there being projector light to become without described in projector light line traffic control;

4) judge whether that all projector have all been calibrated complete, if not yet all calibration is complete, select the still unregulated projector in next road as current projector and redirect execution step 2); Otherwise end task and exit;

The detailed step of described step 3) is as follows:

3.1) the content output window of the corresponding Controlling vertex of initialization current projector, exported by current projector in black background by described content output window, now all light sensors all return the detection signal of projector light; For plane right-angle coordinate is set up on four summits of described content output window, make one in two of each vertex correspondence light sensors to be positioned in x-axis, another is positioned in y-axis, select a summit as current vertex, redirect performs next step;

3.2) detection signal that two light sensors corresponding to current vertex is passed back is obtained, if the detection signal that described two light sensors are passed back has been projector light, then the x-axis coordinate of current vertex and y-axis coordinate are specified unit toward the medial movement one of content output window respectively, return and re-execute step 3.2); If be only positioned at detection signal that the light sensor in x-axis passes back in described two light sensors for there being projector light, then only the x-axis coordinate of current vertex specified unit toward the medial movement one of content output window, return and re-execute step 3.2); If be only positioned at detection signal that the light sensor in y-axis passes back in described two light sensors for there being projector light, then only the y-axis coordinate of current vertex specified unit toward the medial movement one of content output window, return and re-execute step 3.2); If the detection signal that described two light sensors are passed back is without projector light, then judge that the summit that current vertex is corresponding with standard viewing area overlaps, whether all summits detecting described content output window all regulate complete, if not yet all regulate complete, selects a unadjusted summit as current vertex to be regulated and returns to re-execute step 3.2), if all adjustment is complete, select a summit of described content output window as current vertex to be verified and redirect performs next step;

3.3) the x-axis coordinate of current vertex and y-axis coordinate are moved respectively one toward the outside of content output window and specify unit, if the detection signal that two light sensors that current vertex is corresponding are passed back has projector light by changing into without projector light, then judge that current vertex is verified, select the not verified summit of the next one in described content output window as current vertex to be verified and re-execute step 3.3) carry out summit checking until all summits of content output window are all verified, then overlap between content output window and standard viewing area after all summits are all verified, current projector calibration is complete and redirect performs step 4), otherwise judge current vertex checking do not pass through, using current vertex as current vertex to be regulated and redirect perform step 3.2) carry out summit adjustment.