CN103869587A - Output calibration method for public-viewpoint naked-eye true three-dimensional display system - Google Patents

Abstract

The invention discloses an output calibration method for a public-viewpoint naked-eye true three-dimensional display system. The method comprises the following steps that photosensitive sensors are arranged at the two ends of the side edges of a standard display area, and a current projector is selected; only the current projector is turned on, the central point of the current projector is adjusted so as to be aligned with the central point of the standard display area, wherein the projection area is larger than the standard display area; a content output window is initialized, and the four vertexes of the content output window are sequentially moved toward the inner side of the content output window in a black background so that the content output window and the standard display area can coincide with each other; whether all the projectors are calibrated or not is judged, and if not, the next projector which is not calibrated is selected as the current projector to be calibrated and is recalibrated; if all the projectors are calibrated, the task is ended and quit. The output calibration method has the advantages that adjustment accuracy is high, adaptability is high, hardware overheads are low, the interference between all videos is little, adjustment is fast, the method is easy and convenient to use, and manpower consumption and time consumption are low.

Description

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

Technical field

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

Background technology

True dimension display technologies and two-dimentional display technique and dimension display technologies have difference in essence.True 3-D display is the display technique that a kind of Existential Space 3 d light fields distributes.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 from different directions the not ipsilateral of observed scene; True color shows the shades of colour that can demonstrate truly object; Dynamic 3 D display technique can show continually varying three-dimensional world in time, as taking off and landing process of aircraft, and static three-dimensional display technique can only show static three-dimensional body, as be parked in the landform in aircraft on airport, battlefield and landforms, earth's surface building etc.

Be different from other dimension display technologies, true dimension display technologies has adopted the mode based on reconstruction of optical wave field, obtains gathering light field by video camera array, exports and reproduces light field afterwards through processing by projected array.Gather link, from the light on object plane through video camera array (m=1,2,3 ... M; N=1,2,3 ... N, M is that video camera array is laterally numbered, N is that video camera array is longitudinally numbered) on its focal plane, record the spatial frequency spectrum 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, has recorded the light distribution of observing object gained from different azimuth on focal plane.Showing link, the light distribution information exchange that gathers the different azimuth of obtaining on lens arra focal plane is crossed to another and organize corresponding projected array (m=1,2,3 ... M; N=1,2,3 ... N, M is that projected array is laterally numbered, and N is that projected array is longitudinally numbered) output, utilizes 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.The 3 d light fields of a certain spectral components in thing surface distributes with function f (x, y, z; T) describe, 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 the light intensity in x direction, f _yfor the light intensity in y direction, f _zfor the light intensity in z direction, three direction coordinates that x, y, z is three-dimensional system of coordinate, t is the time.

Show that the reproduction of link is the inverse process of record, show that link be made up of M × N projecting cell and optical screen, the communication that M × N projecting cell records collection lens unit is to optical screen, and generation spatial frequency is (f _x,-f _y) output light, the light of respectively organizing spatial frequency is in the right-hand image space stack of projected array, also non-coherent addition of the light of all different wave lengths produces the optical field distribution of the discretize basically identical with the original.Optical screen has 120 ° of vertical direction extended corners, the characteristic that horizontal direction extended corner is 1 °, and each projection ray can effectively complete the reconstruct of light field after the processing of optical screen, realizes true 3-D display at the other end of screen.

As shown in Figure 1, build principle according to the light field of true 3-D display, projector sets up distribution in the same horizontal line, there is each other certain distance, project to from different directions the optical screen at center, after the processing of light through optical screen, reproduce original spatial light field at the opposite side of screen, spectators can see complete true 3-D display effect, and the accuracy of projection ray has played very important effect to three-dimensional reproduction.In the time that projector projects, make to show that in order to realize the reconstruct of light field light field is identical with collection light field, the graphics display area of projection should be optical screen region, but because projector all exists skew by different directions projection to screen and in all directions, be projected in close together project the light diffusion coming be less than far away while diffusion, the width difference on the image both sides that cast out, there is the problem of trapezoidal deformation in the demonstration of figure.

As shown in Figure 2, the image that in the trapezoidal deformation map existing when the projector projects of real three-dimensional display system, multiple projector projects go out is as shown in dotted line wire frame part, and standard viewing area is as shown in black wire frame part in figure.Because projector projects from different directions to screen, the incident angle of light has very large difference, can there is trapezoidal deformation in the region projecting in the diverse location of same image, view field can not overlap with the screen area of standard, now destroy the condition that true 3 d light fields is rebuild, need to carry out the calibration of view field, make each unit of array of rear-projectors all project the region that optical screen is demarcated, make to show that light field is consistent with collection light field.Therefore how the image of projector projects being calibrated and made it project standard part, make the light field of true 3-D display can 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 a little less than its trapezoid correction function, cannot solve the problem on deformation of complicated direction projection, what regulate is range limited, and the low precision regulating, cannot meet the demand of the true 3-D display of many viewpoints.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, thereby reach the object of keystone, the technology realizing comprises the direct adjustment of camera lens and calibrates realization by projector being erected on accurate optics The Cloud Terrace, adjust the height of projector by The Cloud Terrace, the mode of horizontal-shift and the angle of pitch regulates, but the instrument that this regulative mode expends is a lot, the difficulty that reaches certain calibration accuracy is high, the time of expending is long, show for many viewpoints, the number of projector is a lot, the time regulating 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 are needed 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 strong adaptability, little, the each road of hardware spending video, regulate quick, easy to use, manpower and time loss rapidly little for the naked output calibration steps of 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 of looking real three-dimensional display system of many viewpoints, implementation step is as follows:

1) arrange at the two ends of each side of the standard viewing area of optical screen that respectively one for detection of the light sensor that has or not projector light, select a road projector as working as front projector;

2) open when front projector close other projector, regulate and align with the central point of described standard viewing area, be greater than described standard viewing area when the view field of front projector when the central point of front projector view field;

3) initialization, when the corresponding content output window of controlling node of front projector, is passed through described content output window when front projector output in black background, and now all light sensors all return to the detection signal of projector light; The medial movement toward content output window by four summits of described content output window successively in black background, according to the detection signal that in described four summits, two adjacent light sensors of each summit are passed back from there being projector light to become without overlapping between content output window described in projector light line traffic control and standard viewing area;

4) judge whether all projector all calibrated complete, if not yet all calibration is complete, select next road still unregulated projector as when front projector redirect execution step 2); Otherwise end task and exit.

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

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

3.1) initialization, when the corresponding content output window of controlling node of front projector, is passed through described content output window when front projector output in black background, and now all light sensors all return to the detection signal of projector light; Set up plane right-angle coordinate for four summits of described content output window, make that in two light sensors corresponding to each summit one is positioned on x axle, another is positioned on y axle, selects a summit as current summit, redirect is carried out next step;

3.2) obtain two detection signals that light sensor is passed back corresponding to current summit, if the detection signal that described two light sensors are passed back has been projector light, the x axial coordinate on current summit and y axial coordinate are specified to unit toward one of the medial movement of content output window respectively, return and re-execute step 3.2); If be only positioned at detection signal that the light sensor on x axle passes back in described two light sensors for there being projector light, only the x axial coordinate on current summit is specified to unit toward one of the medial movement of content output window, return and re-execute step 3.2); If be only positioned at detection signal that the light sensor on y axle passes back in described two light sensors for there being projector light, only the y axial coordinate on current summit is specified to unit toward one of the medial movement 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, judge that the summit corresponding with standard viewing area, current summit overlaps, whether all summits of detecting described content output window all regulate complete, if not yet all regulate completely, select a unadjusted summit as current summit to be regulated and return to re-execute step 3.2), if all regulate completely, select a summit of described content output window to carry out next step as current summit redirect to be verified;

3.3) the x axial coordinate on current summit and y axial coordinate are specified to unit toward one of the outer side shifting of content output window respectively, if the detection signal that two light sensors corresponding to current summit are passed back is by changing into and have projector light without projector light, judge that current summit is verified, select the not verified summit of the next one in described content output window also again to perform step 3.3 as current summit to be verified) carry out summit checking until all summits of content output window are all verified, after being all verified, all summits between content output window and standard viewing area, overlap, complete and the redirect of current projector calibration execution step 4), otherwise judge that the checking of current summit do not pass through, using current summit as current summit to be regulated and redirect execution step 3.2) carry out summit adjusting.

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

1, first the present invention determines view field roughly by the simple device that comprises The Cloud Terrace etc., then carry out projector calibration by light sensor in conjunction with the mode of the software and hardware combining that the summit in black background regulates to content output window, accurately control the drop shadow spread of video, accurately controlling projection region, reach the effect that many viewpoints all project the same position of same screen, the problem that has solved the trapezoidal deformation that projector angle brings, has high, an adaptable advantage of degree of regulation.

2, the present invention arranges at the two ends of each side of the standard viewing area of optical screen that respectively one for detection of the light sensor that has or not projector light, use a small amount of sensor to assist, do not need to use complicated adjusting sensing plate, can realize the shape adjustment to content output window, definite view field is accurate, relatively prior art and optics keystone mode needs accurate The Cloud Terrace of every road video configuration, has advantages of that hardware spending is little.

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

Accompanying drawing explanation

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

Trapezoidal deformation schematic diagram when Fig. 2 is the naked projector projects of looking real three-dimensional display system of the many viewpoints of prior art.

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 and the standard viewing area contrast schematic diagram that obtain to projector by The Cloud Terrace 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 adjusting of content output window in the embodiment of the present invention.

Embodiment

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

1) arrange at the two ends of each side of the standard viewing area of optical screen that respectively one for detection of the light sensor that has or not projector light, select a road projector as working as front projector.

The naked optical screen depending on real three-dimensional display system of many viewpoints adopts optical thin film to be made, for the naked real three-dimensional display system of looking of many viewpoints of concrete application, the size of its optical screen has been passed through design and has been produced stationary installation, can determine the naked standard viewing area of looking real three-dimensional display system of many viewpoints on optical screen.As shown in Figure 4, in the present embodiment by arranging at the two ends of each side of standard viewing area that respectively one for detection of the light sensor that has or not projector light, light sensor connects the naked control end of looking real three-dimensional display system of many viewpoints, make light sensor import detection signal (having or not projector light) into the many viewpoints naked control end of looking real three-dimensional display system, can define by light sensor the position that projector projects region should be calibrated to.In the present embodiment, light sensor specifically adopts photoresistance, light and shade sensitive by photoresistance to light, can effectively distinguish and whether have the direct projection of projector light to light sensor region, thereby output has projector light signal or a detection signal without projector light signal, thereby realize border to 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 be passed respectively transducing signal back, equally also can realize border to standard viewing area and the location on summit.

2) open when front projector close other projector, regulate and align with the central point of standard viewing area, be greater than standard viewing area when the view field of front projector when the central point of front projector view field.

In the present embodiment, specifically referring to that The Cloud Terrace by projector regulates aligns with the central point of standard viewing area, is greater than standard viewing area when the view field of front projector when the central point of front projector view field.The The Cloud Terrace degree of regulation of projector requires low, when initial, can carry out with The Cloud Terrace the adjusting of simple view field, view field is moved to the surrounding of standard viewing area, make to be a bit larger tham standard viewing area when the view field of front projector, and the projected centre point when front projector is alignd with the central point of standard viewing area, fix afterwards The Cloud Terrace, make projection hardware fixing physically, projecting direction can not change.

As shown in Figure 5, the standard viewing area that the inside casing in figure is rectangle, the housing in figure is the view field when front projector, in the governing loop of carrying out simple view field with The Cloud Terrace, when the view field of front projector is a bit larger tham standard viewing area.Owing to being undertaken by The Cloud Terrace after the adjusting of simple view field, view field fails to overlap with standard viewing area, need to export further to adjust the content output window in view field is corrected, content output window in view field is corrected to standard viewing area and overlap.

3) initialization, when the corresponding content output window of controlling node of front projector, is passed through content output window when front projector output in black background, and now all light sensors all return to the detection signal of projector light; The medial movement toward content output window by four summits of content output window successively in black background, the detection signal of passing back according to two adjacent light sensors of each summit in four summits is from there being projector light to become without overlapping 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) initialization, when the corresponding content output window of controlling node of front projector, is passed through content output window when front projector output in black background, and now all light sensors all return to the detection signal of projector light; Set up plane right-angle coordinate for four summits of content output window, make that in two light sensors corresponding to each summit one is positioned on x axle, another is positioned on y axle, selects a summit as current summit, redirect is carried out next step.

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

3.2) obtain two detection signals that light sensor is passed back corresponding to current summit, if the detection signal that two light sensors are passed back has been projector light, the x axial coordinate on current summit and y axial coordinate are specified to unit toward one of the medial movement of content output window respectively, return and re-execute step 3.2); If be only positioned at detection signal that the light sensor on x axle passes back in two light sensors for there being projector light, only the x axial coordinate on current summit is specified to unit toward one of the medial movement of content output window, return and re-execute step 3.2); If be only positioned at detection signal that the light sensor on y axle passes back in two light sensors for there being projector light, only the y axial coordinate on current summit is specified to unit toward one of the medial movement 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, judge that the summit corresponding with standard viewing area, current summit overlaps, it is complete whether all summits of Detection of content output window all regulate, if not yet all regulate completely, select a unadjusted summit as current summit to be regulated and return to re-execute step 3.2), if all regulate completely, next step is carried out as current summit redirect to be verified in a summit of chosen content output window.

3.3) the x axial coordinate on current summit and y axial coordinate are specified to unit toward one of the outer side shifting of content output window respectively, if the detection signal that two light sensors corresponding to current summit are passed back is by changing into and have projector light without projector light, judge that current summit is verified, the not verified summit of the next one in chosen content output window is as current summit to be verified and again perform step 3.3) carry out summit checking until all summits of content output window are all verified, after being all verified, all summits between content output window and standard viewing area, overlap, complete and the redirect of current projector calibration execution step 4), otherwise judge that the checking of current summit do not pass through, using current summit as current summit to be regulated and redirect execution step 3.2) carry out summit adjusting.

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

4) judge whether all projector all calibrated complete, if not yet all calibration is complete, select next road still unregulated projector as when front projector redirect execution step 2); Otherwise end task and exit.

The above is only the preferred embodiment of the present invention, and protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonging 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 (2)

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

1) arrange at the two ends of each side of the standard viewing area of optical screen that respectively one for detection of the light sensor that has or not projector light, select a road projector as working as front projector;

2) open when front projector close other projector, regulate and align with the central point of described standard viewing area, be greater than described standard viewing area when the view field of front projector when the central point of front projector view field;

3) initialization, when the corresponding content output window of controlling node of front projector, is passed through described content output window when front projector output in black background, and now all light sensors all return to the detection signal of projector light; The medial movement toward content output window by four summits of described content output window successively in black background, according to the detection signal that in described four summits, two adjacent light sensors of each summit are passed back from there being projector light to become without overlapping between content output window described in projector light line traffic control and standard viewing area;

4) judge whether all projector all calibrated complete, if not yet all calibration is complete, select next road still unregulated projector as when front projector redirect execution step 2); Otherwise end task and exit.

2. according to claim 1ly it is characterized in that for the naked output calibration steps of looking real three-dimensional display system of many viewpoints, the detailed step of described step 3) is as follows:

3.1) initialization, when the corresponding content output window of controlling node of front projector, is passed through described content output window when front projector output in black background, and now all light sensors all return to the detection signal of projector light; Set up plane right-angle coordinate for four summits of described content output window, make that in two light sensors corresponding to each summit one is positioned on x axle, another is positioned on y axle, selects a summit as current summit, redirect is carried out next step;

3.2) obtain two detection signals that light sensor is passed back corresponding to current summit, if the detection signal that described two light sensors are passed back has been projector light, the x axial coordinate on current summit and y axial coordinate are specified to unit toward one of the medial movement of content output window respectively, return and re-execute step 3.2); If be only positioned at detection signal that the light sensor on x axle passes back in described two light sensors for there being projector light, only the x axial coordinate on current summit is specified to unit toward one of the medial movement of content output window, return and re-execute step 3.2); If be only positioned at detection signal that the light sensor on y axle passes back in described two light sensors for there being projector light, only the y axial coordinate on current summit is specified to unit toward one of the medial movement 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, judge that the summit corresponding with standard viewing area, current summit overlaps, whether all summits of detecting described content output window all regulate complete, if not yet all regulate completely, select a unadjusted summit as current summit to be regulated and return to re-execute step 3.2), if all regulate completely, select a summit of described content output window to carry out next step as current summit redirect to be verified;

3.3) the x axial coordinate on current summit and y axial coordinate are specified to unit toward one of the outer side shifting of content output window respectively, if the detection signal that two light sensors corresponding to current summit are passed back is by changing into and have projector light without projector light, judge that current summit is verified, select the not verified summit of the next one in described content output window also again to perform step 3.3 as current summit to be verified) carry out summit checking until all summits of content output window are all verified, after being all verified, all summits between content output window and standard viewing area, overlap, complete and the redirect of current projector calibration execution step 4), otherwise judge that the checking of current summit do not pass through, using current summit as current summit to be regulated and redirect execution step 3.2) carry out summit adjusting.

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