CN101038421A - Volumetric 3D display system based on multiple projectors rotating screen - Google Patents
Volumetric 3D display system based on multiple projectors rotating screen Download PDFInfo
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Abstract
The invention provides a multiple projector rotating screen based 3D display system, including: one rotating screen, driven by motor; an image processing device, decomposes the 3D physical model in the cylindrical coordinate system in a series of multiple angular 2D images and sent to the data processing unit of all projectors; at least two projectors arranged around the rotating screen, synchronously project a 2D image with the corresponding angle on one of the rotating screen, thereby restructured the 3D image similar with that of actual objects. The invention may improve the updating rate, resolution and gray step-scale, based on the current available technical level of software and hardware, the lower cost, high display effect of 3D display device may be manufactured.
Description
Technical field
The present invention relates to a kind of body dimension display technologies, more particularly, relate to a kind of body dimension display technologies, can be widely used in fields such as meteorologic analysis, medical imaging, air traffic control, military simulation, machinery assembling based on multi-projector rotating panel.
Background technology
3-D display can provide directly perceived, natural AC mode, helps people after the various depth cueings of integrated use, obtains true, abundant, reliable sensory experience, is the inevitable development trend of display technique.Can only provide limited stereoscopic right by means of the stereoscopic 3-D display of glasses or skew ray grid, the limited and human eye of display effect is assembled and is regulated and can not mate when observing, and watches eyes harmful for a long time.Holography dynamically shows the data transmission of magnanimity and is stored on the present technical merit unrealistic substantially.The body dimension display technologies can satisfy " directly visual, full angle is visual and group look " etc. a series of requirements, on technology realization and display effect, all relatively have superiority, thereby in fields such as meteorologic analysis, medical imaging and air traffic control and military simulation, have broad application prospects.
In recent years, true 3-D display has been done a large amount of research both at home and abroad, proposed a series of displaying scheme, mainly can be divided into volume silent oscillation and volume and scan type two major types.
The body of volume silent oscillation show be by suitable mode encourage or the static volume of addressing in display medium, and refresh with the speed that is higher than the human eye flicker fusion frequency, so that produce volumetric pixel, constitute the volume image that loads on truly in the three-dimensional real space thus in each space specified position.This class body shows according to the display medium difference, can be divided into following three types again.1) the volume silent oscillation based on the photolytic activity medium shows; this demonstration is usually based on two step of the double frequency process of motivation; require the photolytic activity medium to have three and increase progressively energy level; can show the two-photon absorption of two different wave lengths; send ground state-intermediate state serially in intersection, the conversion of intermediate state-excited state.Like this, the decay when excited state is returned ground state will be accompanied by the emission of optical photon.Shortcoming is the display medium that lacks suitable driving source and have abundant phototranstormation efficiency; 2) the volume silent oscillation based on passive matrix shows, utilizes multilayer liquid crystal to constitute the demonstration volume, and original three-dimensional image is resolved into a plurality of two-dimensional section images, explains corresponding two-dimensional image information with a plurality of liquid crystal layers respectively then.Because the corresponding overlong time of liquid crystal, display device are extremely complicated, operability is not high; 3) the volume silent oscillation based on active matrix shows, this scheme utilizes light-emitting component to constitute uniform, isotropic cubical array in physical space, each element is corresponding to a self luminous physical size unit, can be by addressing optionally and the organizator pixel.Shortcoming is that the size of cubical array is directly related with the scope of image space, size of element own and interval determination the fine and smooth degree of shown image, be electrically connected complexity, the volumetric pixel density refractory is to satisfy application requirements.
The body that volume scans type shows it is the cyclical movement that utilizes a two-dimensional surface, pretreated original three-dimensional information is presented at chronologically fast some places, locus of scanning on this surface, refresh with the speed that is higher than the human eye flicker fusion frequency again, constitute the reproduced image that truly loads in the three-dimensional real space therefrom.The true 3-D display of this class can be divided into following two class modes again according to the difference of screen motion mode: 1) volume that moves based on plane screen scans type and shows, the motion in one dimension by projection screen produces scanning of two dimensional image.Owing to be difficult to produce the high frequency mechanical drive system of the practical yardstick that reaches big.Therefore, System Operation mechanism has limited the mobile range of target screen, and causing this volume that moves based on plane screen to scan the type scheme can't promote; 2) volume based on the plane screen rotation scans the type demonstration, mainly contains based on the volumetric 3 D display system of single projector rotating panel and the volumetric 3 D display system that rotates based on two-dimentional LED screen.
At present, employed based on the body three-dimensional display apparatus of single projector rotating panel based on DMD
TMThe frame frequency of the three-chip type projection engine of technology is about 5KHz, and the volumetric pixel total number of positions reaches 116,785,152, body refresh rate 30Hz; Can realize that 3～21bit color range shows, when the volumetric pixel sum of reality activation was consistent with the volumetric pixel total number of positions, the image of reproduction can only comprise 2
3Plant color; When the volumetric pixel sum that activates when reality was less than the volumetric pixel total number of positions, the multipotency of the image of reproduction comprised 2
21Plant color.Because this system has adopted soft, the hardware facility of representing the contemporary science and technology development level, so its production cost is quite high, and operation and maintenance cost is also quite expensive.Simultaneously its body resolution 768 * 768 * 198 of providing mainly has benefited from the resolution 768 * 768 of projected image, and total width of cloth number of projected image is difficult to break through 198 again owing to be subjected to the restriction of projector frame frequency.Cause the power of lighting source can not be too big owing to adopted single projector, dmd chip to be in heating problem under the strong illumination for a long time, thereby the brightness of display image be restricted.
Body display system based on the rotation of two-dimentional LED screen shows 3-D view by the LED that lights on rotary screen.Because image forming appts has brought difficulty on rotary screen, for data transmission and electric power supply.The screen single face is luminous, for comprehensive visual, can only improve the rotating speed of rotary screen, has not only increased the requirement that volume of transmitted data has also improved mechanical system simultaneously.The size of LED luminous die is bigger, and screen size has in limited time, and resolution can not be very high.
Summary of the invention
Therefore, the present invention proposes in order to address the above problem, its purpose is to provide a kind of body dimension display technologies based on multi-projector rotating panel, adopt multi-projector multi-angle projection mode, in the refresh cycle, multi-projector timesharing exposure, each projector projection piece image, reduced requirement, thereby improved refresh rate, resolution and GTG greatly projector.Multi-projector multi-angle projection mode makes the parallel transmission of view data become possibility, has broken through the existing image data transmission rate bottleneck of single projector and LED rotary screen mode.
For achieving the above object, the invention provides a kind of volumetric 3 D display system, comprising based on multi-projector rotating panel:
One rotary screen is rotated by driven by motor;
Image processing apparatus resolves into three-dimensional object model the two dimensional image of a series of multi-angles and sends the data processing unit of each projector in cylindrical coordinate;
At least two projectors put around the rotary screen, with a two dimensional image synchronized projection of corresponding angle on a Rotation screen, thereby reconstruct the 3-D view similar to real-world object.
The preferably adopts a kind ofly to substitute the stroboscopic light source of the required high brightness of projector, high repetition based on the high brightness synchronous lighting divider of continuous light source, with guarantee screen and with its over against projector's exposure synchronously.
The preferably, wherein said rotary screen can be unidirectional diffuse reflection screen or two-way dispersion screen.
The preferably, the spatial light modulation device of wherein said projector can be LCD (Liquid CrystalDisplay), DMD (Liquid Crystal Display), LCOS (Liquid Crystal on Silicon).
The preferably, wherein said image processing apparatus can be that computing machine also can be other treating apparatus.
The preferably, the synchronous divider of wherein said light source can replace reflected light path by glass bar, sticking plaster or other biography luminescent material.
Description of drawings
Fig. 1 is the schematic perspective view of multi-projector rotating panel volumetric 3 D display system of the present invention;
Fig. 2 is for adopting the synchronous lighting divider of catoptron;
Fig. 3 is for adopting the synchronous lighting divider that passes light beam;
Fig. 4 is the volumetric 3 D display system of the multi-projector of employing two-way dispersion screen and synchronous lighting divider;
Projector put when Fig. 5 was employing two-way dispersion screen and synchronous lighting divider.
Embodiment
Below in conjunction with one of application of the present invention--the head medical treatment shows that the present invention will be further described.The visual scene that the body 3-D display provides is transparent, and in the medical imaging field, in order to carry out pathological diagnosis better, the object that requires to be studied is displayed on the corresponding physiological location according to original appearance, each other any blocking can not be arranged.Native system obtains a series of two dimensional images with CT scan and carries out three-dimensional modeling, in cylindrical coordinate, three-dimensional model is resolved into the two dimensional image of a series of multi-angles again, by a plurality of projectors multi-angle with the two dimensional image synchronized projection of corresponding angle on a Rotation screen, thereby reconstruct the 3-D view similar, help the diagnosis state of an illness to real-world object.
According to the size of general head, native system adopts the rotary display screen of 320mm * 240mm.Projector adopts the true color LCDs of 320 * 240 resolution, for avoiding low excessively flicker, the frame frequency of employing 30Hz, 180 projectors of week use of causing of picture frame frequency.Screen adopts the two-way dispersion screen, can effectively reduce quantity, the reduction screen rotating speed of projector.
As shown in Figure 4, two-way dispersion shields by motor 1 driven rotary, and light source is through the reverse outgoing of diameter respectively of two-way reflective mirror up and down.And by motor 2 drive catoptrons and screen rotation synchronously.The light source focus is got to when passing light beam incident end, and corresponding projector shapes to be installed such as (write in advance image) being in exposes and is imaged on the screen, all can see image at 360 ° of circumferencial directions.1 ° of angular resolution, 180 projectors as if 0.5 ° of angular resolution, then need 360 projectors.Projector is in circumferential directions, and as shown in Figure 5, wherein 0 °-180 ° is the projector at odd number angle, and 180 °-360 ° is the projector at even number angle, the projection of institute of projector be the cross-sectional image of corresponding angle three-dimensional body.When screen rotates, alternately exposure on the odd even projector diameter direction, screen rotates 180 °, and all projector's exposures are once finished a 3-D view refresh cycle, reconstruct the true 3-D view of 360 ° of complete range of observation.
Image processing apparatus in the system adopts PC, by PC CT scan is obtained a series of two dimensional images and carry out three-dimensional modeling, in cylindrical coordinate, three-dimensional model is resolved into the two dimensional image of a series of multi-angles again, then image is transferred to projector and carries out 3-D display.Owing to watch CT scan figure not need in real time, so can adopt earlier a series of images data transmission of handling well in the PC is shown to behind the buffer memory of each projector again, can transmit some information to the data processing unit of each projector in real time by PC during demonstration, for example need some characters that superpose or simple image information etc., finish the stack of character picture etc. by data processing unit.If need to show in real time 3-D view, show in real time that owing to body is three-dimensional the image data transmission rate is had very high requirement, adopt the separate unit PC can not satisfy the needs of data transmission substantially.For satisfying the needs of data transmission, can develop the computer card of PCI-E interface, on the basis of the data transmission rate that improves the separate unit PC, adopt the transmission of multiple pc machine parallel data.In order to guarantee the multiple pc machine in transmission basic synchronization during data, be provided with wherein one as main control computer, finish synchro control by the integrated circuit board of PCI-E to all PCs.
For those skilled in the art; after having understood content of the present invention; can be under the situation that does not deviate from the principle and scope of the present invention; the method according to this invention is carried out various corrections and the change on form and the details, but these are based on correction of the present invention with change still within claim protection domain of the present invention.
Claims (6)
1, a kind of volumetric 3 D display system based on multi-projector rotating panel, this system comprises:
One rotary screen is rotated by driven by motor;
Image processing apparatus resolves into three-dimensional object model the two dimensional image of a series of multi-angles and sends the data processing unit of each projector in cylindrical coordinate;
At least two projectors put around the rotary screen, with a two dimensional image synchronized projection of corresponding angle on a Rotation screen, thereby reconstruct the 3-D view similar to real-world object.
2, system according to claim 1, it is characterized in that can a kind of white light stroboscopic light source that substitutes the required high brightness of projector, high repetition based on the high brightness synchronous lighting divider of continuous light source, with guarantee screen and with its over against projector's exposure synchronously, and improve the brightness and contrast who shows.
3, system according to claim 2 is characterized in that the high brightness synchronous lighting divider of described continuous light source can be a catoptron, also can be glass bar, sticking plaster or other biography luminescent material.
4,, it is characterized in that described rotary screen can be unidirectional diffuse reflection screen or two-way dispersion screen according to any described system of claim 1 to 3.
5, according to any described system of claim 1 to 3, the spatial light modulation device that it is characterized in that described projector can be LCD, DMD, LCOS.
6, according to any described system of claim 1 to 3, it is characterized in that described image processing apparatus, can be that computing machine also can be other treating apparatus.
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| CN101290467B (en) * | 2008-06-05 | 2010-06-16 | 北京理工大学 | Tangible real three-dimensional display method based on multi- projector rotating panel three-dimensional image |
| CN101982806A (en) * | 2010-09-17 | 2011-03-02 | 浙江大学 | Large-size spatial 3D cinema projection optical system and method |
| CN102520787A (en) * | 2011-11-09 | 2012-06-27 | 浙江大学 | Real-time spatial three-dimensional presentation system and real-time spatial three-dimensional presentation method |
| CN102566390A (en) * | 2012-01-12 | 2012-07-11 | 北京理工大学 | Optimization method of light distribution for undertaking color three-dimensional hologrphic image by using uniform scattering media and display system of color three-dimensional hologrphic image |
| CN102566234A (en) * | 2012-01-12 | 2012-07-11 | 北京理工大学 | Light-guiding type white light synchronous illuminating device for multi-projector true three-dimensional displayer |
| CN102722031A (en) * | 2012-06-18 | 2012-10-10 | 上海卫星工程研究所 | Optical system of laser true three-dimensional display |
| CN102929089A (en) * | 2012-11-19 | 2013-02-13 | 北京理工大学 | Lighting device capable of improving resolution of multi-projector true three-dimensional display |
| CN102254515B (en) * | 2008-10-31 | 2013-04-24 | 浙江大学 | Parallel LED drive system based on three-dimensional display |
| CN103676449A (en) * | 2013-12-12 | 2014-03-26 | 北京理工大学 | Non-scanningtype naked eye three-dimensional display device based on reflection-type scattering screen |
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| CN104506919A (en) * | 2014-12-26 | 2015-04-08 | 上海智物信息技术有限公司 | Method and system for synchronizing display content and display screen movement |
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