CN105700162A - Optical field scanning based full parallax 360-degree 3D display device and method - Google Patents
Optical field scanning based full parallax 360-degree 3D display device and method Download PDFInfo
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- CN105700162A CN105700162A CN201610213413.7A CN201610213413A CN105700162A CN 105700162 A CN105700162 A CN 105700162A CN 201610213413 A CN201610213413 A CN 201610213413A CN 105700162 A CN105700162 A CN 105700162A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
- G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/602—Lenticular screens
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Abstract
The invention discloses an optical field scanning based full parallax 360-degree 3D display device including a deflection type directional scattering screen, a cylindrical lens array screen, a high speed projector, a rotary device and a rotation detection device. The invention also discloses an optical field scanning based full parallax 360-degree 3D display method. By optical field reconstruction and integration on view images corresponding to different viewpoints, full parallax 3D display is realized. According to the invention, by the combination of a scanning-type optical field reconstruction scheme and an integration imaging display scheme, free full parallax 3D display in a display space is realized. The scanning-type optical field reconstruction scheme and an integration imaging technology based on cylindrical lens array are respectively used for reconstruction of a horizontal optical field and a vertical optical field, so that full parallax 3D display with correct viewpoints at different horizontal positions and vertical positions is realized.
Description
Technical field
The invention belongs to dimension display technologies field, be specifically related to a kind of 360 ° of three-dimensional display apparatus of full parallax based on light field scanning and method。
Background technology
In recent years, along with the fast development of photoelectric technology and computer drawing technology, dimension display technologies is experiencing unprecedented development, and the research that structure big the visible angle even naked eye three-dimensional of 360 ° are shown is also affected by increasing attention with application。Existing dimension display technologies includes hologram three-dimensional Display Technique, body dimension display technologies, integration imaging dimension display technologies and light field dimension display technologies etc.。
Hologram three-dimensional display utilizes the method for interference record diffraction reconstruction, records and has reappeared all wavefront information such as the intensity of target light, phase place and wavelength, so viewing real-world object and its hologram image of viewing do not have any difference in theory。But being limited by the resolution of photographic film and reproduce the wavelength of light, definition and the color reduction degree of actual displayed scene all decline to a great extent, and more difficult are applied to Dynamic Announce。Body three dimensional display reconstructs, by the mode of LED array or laser scanning, the tissue points cloud that full angle is luminous, it is easy to three dimensional display that is integrated and that realize large scale, but uncontrollable radiation direction, cause that the three-dimensional scenic reconstructed is transparent so that it is do not possess occlusion effect and texture display cannot be realized。Integration imaging three dimensional display is realized with cylindrical grating (or cylindrical lens array) combination by liquid crystal panel, guides the light comprising specifying information to enter certain observation district, produces the image corresponding with each viewpoint, it is achieved three dimensional display。But the refracting power of the resolution of liquid crystal panel and cylindrical grating, limits correct visual angle number and the observable angle of system。Light field three dimensional display controls information and the exit direction of light by shadow casting technique and directional screen, realize the reconstruction of optical wave field of target object, show compared to holography, depend on the light field three dimensional display of Effective Pictures By A Computer technology and can realize high-resolution and dynamically and there is the three-dimensional scenic of complex texture。The implementation of light field three dimensional display includes sweep type and splice type。Sweep type light field three dimensional display realizes 360 degree of scanning reconstruct of light field by high-speed projector and deviation type directional diffuser screen, and splice type light field three dimensional display realizes the splicing reconstruct of light field by projector array and directional diffuser screen。
Along with the performance such as resolution and modulation degree of kinds of displays part constantly promotes, integration imaging three dimensional display and light field three dimensional display to realize effect more and more true to nature, but it is limited by practical set-up, for realizing horizontal disparity and vertical parallax simultaneously, display system needs the huge scialyscope of usage quantity and microlens array, or increase tracing of human eye module, this will make whole system become huge be not easy to maintenance。
Summary of the invention
For overcoming the deficiencies in the prior art, the invention provides a kind of 360 ° of three-dimensional display apparatus of full parallax based on light field scanning and method, will based on light field scanning technique, by conjunction with sweep type reconstruction of optical wave field and integration imaging displaying scheme, it is achieved in display space, full parallax three dimensional display is experienced freely。Wherein horizontal disparity is realized by sweep type reconstruction of optical wave field solution, by in the image sequence synchronized projection obtained according to mapping algorithm to the transmission-type directional scattering screen rotated, have benefited from the light modulating characteristic of deviation type directional diffuser screen, system achieves the reconstruction of optical wave field of horizontal direction by rotation sweep, and user can observe the scene at corresponding visual angle around display system。But owing to the vertical direction of screen has relatively large scattering angle, this kind of sweep type light field system cannot realize vertical parallax。By cylindrical lens array being superimposed upon the mode on deviation type directional diffuser screen, it is possible to achieve the secondary modulation to vertical direction light, therefore realize the reconstruction of optical wave field of vertical direction, it is achieved full parallax three dimensional display。
The concrete technical scheme of the present invention is as follows:
A kind of 360 ° of three-dimensional display apparatus of full parallax based on light field scanning, including deviation type directional scattering screen, cylindrical lens array screen, high-speed projector, tumbler, rotation detecting device。
Deviation type directional scattering screen: the exit direction of incident ray is carried out level modulation；
Cylindrical lens array screen: the exit direction of incident ray is vertically modulated；
High-speed projector: obtain two-dimensional image sequence according to the optical characteristics of screen, and it is projected into the relevant position of screen, coordinate the rotation of screen to realize 3-D view and show；
Tumbler: be connected with directional diffuser screen, and drive directional diffuser screen to rotate；
Rotation detecting device: the detection tach signal of tumbler and angle position are also transferred to high-speed projector and realize the regulation and control of projection picture。
Preferably, described deviation type directional scattering screen can make incident ray that the deviation of special angle occurs to observer position, makes have relatively large scattering angle degree through light a dimension simultaneously, and another dimension has less scattering angle。Coordinating for the light field modulating properties with cylindrical lens array screen, described directional diffuser screen group needs transmission-type and low dispersion。As preferably, described deviation type directional diffuser screen is transmission-type deviation type holographic microstructure diffuser screen, namely becomes the scattering screen between 30 ° to 60 ° angles with directive gain with screen normal。
Preferably, described cylindrical lens array screen can guide light to enter three-dimensional display area and form convergent point, when it is covered on directional scattering screen and ensures that each Cylindrical element is accurately directed at projected pixel, it is achieved the secondary modulation to equally distributed vertical light field originally。The spatial aspect number of the three-dimensional scenic reconstructed is determined by parameters such as high-speed projector refresh rate, projection image resolution ratio, screen rotation speed, cylindrical lens array spatial frequencys。
Preferably, described high-speed projector is colored high frame frequency scialyscope, uses three-chip type DLP high speed spatial light modulator and corresponding three-color LED or laser lighting。
The present invention also provides for a kind of 360 ° of 3 D displaying methods of full parallax based on light field scanning, specifically comprises the following steps that
(1) computer is according to parameters such as threedimensional model, high-speed projector and the distance of deviation type directional scattering screen, color depths, and the observer for varying level Yu vertical position calculates triple channel image sequence information；
(2) computer spatial frequency according to projection image resolution ratio and cylindrical lens array at a high speed, is overlapped the image sequence corresponding to diverse location observer processing, and builds projection triple channel image sequence；
(3) composite screen group is arranged on tumbler and is rotated by it, and the rotation detecting device detection tach signal of tumbler and angle position are also transferred to high-speed projector, and high-speed projector updates projection picture according to command synchronization；
(4) respectively the exit direction of incident ray is horizontally and vertically modulated by described deviation type directional scattering screen and cylindrical lens array screen, show realizing 3-D view。
The present invention will by conjunction with sweep type reconstruction of optical wave field and integration imaging displaying scheme, light is carried out simultaneously level and vertical modulation, realize full parallax three dimensional display experience freely in display space, and keep display resolution (including level and vertical angular resolution) and the reconstruct viewpoint number that three dimensional display is higher。
Accompanying drawing explanation
Fig. 1 is the schematic diagram of 360 ° of three-dimensional display apparatus of full parallax of the present invention。
Fig. 2 is the schematic diagram that in the present invention, sweep type reconstruction of optical wave field realizes horizontal disparity。
Fig. 3 is the schematic diagram that in the present invention, integration imaging technology realizes vertical parallax。
Detailed description of the invention
Describe the present invention in detail below in conjunction with accompanying drawing, but the present invention is not limited to this。
As it is shown in figure 1, the 360 ° of three-dimensional display apparatus of full parallax based on light field scanning include: high-speed projector 1, deviation type directional scattering screen 2, cylindrical lens array screen 3, tumbler 4, rotation detecting device 5 and the image control mold 6。
The core devices of high-speed projector 1 is the reflex type digital micro mirror element (DMD) with High Speed Modulation rate, it is possible to use 3 DMD in conjunction with redgreenblue LED illumination, it is achieved have the projection of coloured high speed。By halftoning algorithm, each passage bianry image shown by DMD is processed, it is achieved there is the display scene of gray scale stratum。
As shown in Figure 2, horizontal disparity is realized by sweep type reconstruction of optical wave field mode: have benefited from the optical characteristics of the deviation type directional scattering screen 2 of screen, temporal projection can be diffused in 360 ° of spaces by rotary apparatus to the information on this screen, constitute the horizontal reconstruction of optical wave field of sweep type, rotating with under the premise of projection accurate synchronization, system there will be no the crosstalk between viewpoint。Assume that a certain moment, directional scattering characteristic make the light through screen point A propagate along a direction, and enter the left eye of observer；In another moment, directional scattering characteristic makes the light through screen point B propagate along b direction, and enters the right eye of observer。If projection picture can make screen point A display space point Q along the strength information in a direction, screen point B display space point Q is along the strength information in b direction, then the reverse trace two-beam line of observer's eyes will end in space convergent point Q rather than the A point B point on screen, and this is the result of brain solid perception。Complex three-dimensional model, it is believed that the set of some cloud, according to this thought, when all apparent places of given observer's viewpoint, will obtain projection image sequence。Owing to screen does not have modulation capability at vertical direction, therefore system can only build the horizontal light field of Q point, and cannot build its vertical light field。The picture number of level reconstruct viewpoint number and screen rotation scialyscope renewal in a week is relevant。
As shown in Figure 3, vertical parallax is realized by integration imaging technology: cylindrical lens array screen 3 has ability of regulation and control at vertical direction, can disperse to be imaged onto in free space by the pixel of object plane integrative display, therefore observer is superimposed upon in each raster unit overlay area at the multi-view image of vertical direction diverse location according to integration imaging algorithm, then observer at vertical direction it will be observed that there is no the anaglyph of crosstalk。Vertically reconstruct viewpoint number is relevant with cylindrical lens array cycle and projection image resolution ratio。If assuming, the cylindrical lens array cycle is Tmm, and projection image resolution ratio is Pmm/pixel, then vertically reconstruct viewpoint number is T/P。
Tumbler 4 drives transmission-type composite screen 2 and 3 to rotate, high-speed projector 1 is placed under composite screen, and tumbler 4 can not stop the projection picture of scialyscope, therefore mode or the hollow cylinder mode of belt wheel transmission can be adopted, realize tumbler design, coordinating with the accurate of Rotation screen for realizing projection picture, design should avoid the skidding displacement owing to poor fit causes when rotating。
Rotation detecting device 5 detects the real-time rotary state of system, it is possible to directly read tumbler signal acquisition rotary state information, it is also possible to the screen in rotating is detected in real time。Rotation detecting device 5 is generally based on the control module that field programmable gate array is core or based on the control module that digital signal processor is core, by being transferred to the image control mold 6 after the acquisition process shaping to the rotating speed of tumbler 4 and angle position signal。
The image control mold 6 is previously according to given threedimensional model and viewpoint position set (including level angle α distribution and the viewpoint set of vertical angles β distribution), calculate the multi-view image obtained corresponding to each viewpoint, and generate projection image set conjunction according to restructing algorithm。According to described above, projection picture corresponding to identical level angle α but different vertical angles β will be superimposed as the integrated projection picture of single width according to algorithm, owing to high-speed projector 1 shows three kinds of color images, it is therefore desirable to projection picture is carried out Color Channel separation and carries out halftone process。According to the angular position information that rotation detecting device 5 feeds back, the integrated projection picture corresponding to each level angle α is transferred to high-speed projector 1 by the image control mold 6, it is achieved control accurate。
The foregoing is only the preferably implementation example of the present invention, be not limited to the present invention, all within present invention spirit and principle, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention。
Claims (6)
1. 360 ° of three-dimensional display apparatus of full parallax based on light field scanning, it is characterised in that include high-speed projector, deviation type directional scattering screen, cylindrical lens array screen and tumbler；
Described high-speed projector, for by sequential projection two dimensional image to described deviation type directional scattering screen and cylindrical lens array screen；
Described deviation type directional scattering screen, the exit direction for incident ray carries out level modulation；
Described cylindrical lens array screen, the exit direction for incident ray is vertically modulated；
Described tumbler, for driving described deviation type directional scattering screen and cylindrical lens array screen to rotate, shows realizing 3-D view。
2. complete 360 ° of three-dimensional display apparatus of parallax as claimed in claim 1, it is characterized in that, there is the rotation detecting device being connected with described tumbler, for detecting tach signal and the angle position of tumbler, and export the regulation and control realizing projection picture to high-speed projector。
3. complete 360 ° of three-dimensional display apparatus of parallax as claimed in claim 1, it is characterised in that described deviation type directional scattering screen is the scattering screen that screen normal has directive gain between 30 ° to 60 ° angles。
4. complete 360 ° of three-dimensional display apparatus of parallax as claimed in claim 3, it is characterised in that described deviation type directional scattering screen is transmission-type deviation type holographic microstructure diffuser screen。
5. complete 360 ° of three-dimensional display apparatus of parallax as claimed in claim 1, it is characterised in that described high-speed projector is colored high frame frequency scialyscope, use three-chip type DLP high speed spatial light modulator and corresponding three-color LED or laser lighting。
6. 360 ° of 3 D displaying methods of full parallax based on 360 ° of three-dimensional display apparatus of parallax complete described in any one of Claims 1 to 5, it is characterised in that include step:
1) parameters according to threedimensional model, high-speed projector and deviation type directional scattering screen, the observer for varying level Yu vertical position arranges triple channel image sequence information；
2) spatial frequency according to projection image resolution ratio and cylindrical lens array at a high speed, is overlapped the image sequence corresponding to diverse location observer processing, and builds projection triple channel image sequence；
3) being driven deviation type directional scattering screen and cylindrical lens array screen by tumbler, utilize the tach signal of motion detection device detection tumbler and angle position and be transferred to high-speed projector, high-speed projector updates projection picture according to command synchronization；
4) respectively the exit direction of incident ray is horizontally and vertically modulated by described deviation type directional scattering screen and cylindrical lens array screen, show realizing 3-D view。
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| CN106527027A (en) * | 2016-11-17 | 2017-03-22 | 杜辉 | Ultra-short focus projector of rotation lens |
| CN107202549A (en) * | 2017-05-27 | 2017-09-26 | 南开大学 | A kind of high precision three-dimensional measurement method and measuring instrument |
| CN107765503A (en) * | 2017-12-06 | 2018-03-06 | 青岛盘谷信息光学有限公司 | A kind of optical stereo display device |
| CN108399865A (en) * | 2018-03-22 | 2018-08-14 | 朱平齐 | A kind of electronic display unit reproducing article 3-dimensional image |
| CN108881881A (en) * | 2018-08-03 | 2018-11-23 | 北京航空航天大学 | A kind of adaptive micro- pattern matrix generation method of integration imaging desktop 3D display |
| CN110264905A (en) * | 2019-05-24 | 2019-09-20 | 亿信科技发展有限公司 | A kind of light field display system |
| CN111158162A (en) * | 2020-01-06 | 2020-05-15 | 亿信科技发展有限公司 | Super multi-viewpoint three-dimensional display device and system |
| CN111351759A (en) * | 2020-04-15 | 2020-06-30 | 杭州谱析光晶半导体科技有限公司 | Spectrum detection method and system |
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| CN107765503A (en) * | 2017-12-06 | 2018-03-06 | 青岛盘谷信息光学有限公司 | A kind of optical stereo display device |
| CN108399865A (en) * | 2018-03-22 | 2018-08-14 | 朱平齐 | A kind of electronic display unit reproducing article 3-dimensional image |
| CN108881881A (en) * | 2018-08-03 | 2018-11-23 | 北京航空航天大学 | A kind of adaptive micro- pattern matrix generation method of integration imaging desktop 3D display |
| CN110264905A (en) * | 2019-05-24 | 2019-09-20 | 亿信科技发展有限公司 | A kind of light field display system |
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| CN111351759A (en) * | 2020-04-15 | 2020-06-30 | 杭州谱析光晶半导体科技有限公司 | Spectrum detection method and system |
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