CN103995454A - Real-time 3D color holographic display method for single spatial light modulator - Google Patents
Real-time 3D color holographic display method for single spatial light modulator Download PDFInfo
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- CN103995454A CN103995454A CN201410209047.9A CN201410209047A CN103995454A CN 103995454 A CN103995454 A CN 103995454A CN 201410209047 A CN201410209047 A CN 201410209047A CN 103995454 A CN103995454 A CN 103995454A
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Abstract
The invention discloses a real-time 3D color holographic display method for a single spatial light modulator. According to the real-time 3D color holographic display method, the size of a system can be reduced, and also calculation acceleration can be achieved. Compared with the prior art, in the technical scheme, 3D color holographic display is achieved through the single spatial light modulator, so that the system is simplified, and an effective means is provided for the miniaturization of a 3D color holographic display device.
Description
Technical field
The present invention relates to holography field, more specifically relate to a kind of single spatial light modulator and realize the method that color hologram real-time three-dimensional shows.
Background technology
In today of information and scientific and technical develop rapidly, traditional display technique cannot meet people's visual demand.People not only pursue higher resolution and color effects more true to nature, also wish that can in space, provide the 3 D stereo identical with real-world object (3D) shows simultaneously.3D shows stereovision and the depth perception that can show image, can be widely used in the aspects such as military affairs, education, video display amusement and medical science.Calculation holographic 3D Projection Display can complete documentation and the wavefront of 3 d objects reconstruction, and human visual system is provided required whole depth informations, shows one of the study hotspot in field therefore become 3D.
Calculation holographic 3D display technique is the combination of holography and Computer display technology.Can show that calculation holographic color display technology is divided into two large classes by the quantity of required LC-SLM according to realizing true color, a class needs three LC-SLM, and another kind of a slice LC-SLM that only needs just can realize true color demonstration.
Three LC-SLMs realize true color: the Japanese scholars such as Sato in 1994 have been analyzed the characteristic of phase-type hologram, and have proposed to utilize three SLM to realize color hologram demonstration.This experimental system comprises three SLM, and optical element is closed in utilization, and the reproduction picture of red, green, blue (RGB) three color components is synthetic in space, has realized holographic colored demonstration.But this scheme needs complicated light path design to be accurately combined with the reproduction picture that ensures tri-passages of RGB, and this has increased the volume of system greatly.
Single LC-SLM realizes true color: in order to reduce cost and the complexity of system, the holographic color display method based on Monolithic LC-SLM becomes one of study hotspot.Color display method based on monolithic spatial light modulator mainly contains two kinds of time division multiplex method, space split plot designs at present.
Proposed to utilize time division multiplex to show method that color hologram shows so far from Japanese scholars such as T.Shimobaba in 2003, the holographic color display technology research based on the method makes great progress.Time division multiplex method is called again time series color display method, under the control of synchronization control circuit, RGB tri-color reproduction light irradiate Monolithic LC-SLM according to certain sequential, hologram is also loaded in this LC-SLM according to certain sequential simultaneously, receives by time series and show RGB tri-colouring component holographic reconstructed images on receiving screen.This scheme requires spatial light modulator to have higher frame frequency speed, when rate to a certain extent after, human eye is felt a synthetic coloured image of time by integrating effect.In this scheme principle, for a kind of color component, it has energy loss on time shaft, therefore its imaging effect can be subject to certain impact.The advantage of time series display packing shows as only needs an information bearing medium device can realize colored demonstration, and system architecture is comparatively simple.But the method need to accurately be controlled the working time and the synchronism that loads corresponding RGB color component hologram in rgb light source, and this has higher requirement to the hardware that loads hologram in response speed.
Japanese scholars I.Tomoyoshi in 2004 etc. have proposed a kind ofly to adopt mode that space is cut apart to realize true color to show.This system utilizes RGB three-color LED to synthesize polychromatic source, is then radiated at simultaneously and on Monolithic LC-SLM, has realized that three-dimensional true color is holographic to be shown with different angles.This seminar improved this system again in 2011, but this system has utilized iterative algorithm to be optimized in the time of computed hologram, was difficult to reach the effect of real-time demonstration.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is just to provide one can reduce system bulk, can realize again and calculate the color hologram 3 D displaying method accelerating.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of method that color hologram real-time three-dimensional shows, its step is as follows:
The first step: the 3D color body of object plane is divided into three components of red, green, blue, and propagates and arrive hologram page through space free respectively, the initial point of object plane is z to the initial point distance of holographic facet;
Second step: RGB three beams plane reference light respectively with different angular illumination at holographic facet, the object light color component corresponding with it interferes and obtains three holograms respectively, red reference light and object light red component interfere and obtain H
1(x, y, z), green reference light and object light green component interfere and obtain H
2(x, y, z), blue reference light and object light blue component interfere and obtain H
3(x, y, z);
The 3rd step: corresponding with it different colours component reference light is interfered and formed a hologram of hologram stack formation, then add a y direction of principal axis slanted phase factor on hologram, expression formula can be written as:
Wherein, k wherein
i=2 π/λ
i, λ
ifor wavelength, ψ is the axial angle of inclination of y, and it can make the zero order diffracted light of spatial light modulator be offset in the process of image reconstruction, and A (x, y) represents the distribution of amplitudes of hologram,
the position that represents hologram distributes mutually;
The 4th step: distribution of amplitudes is normalized, then multiplies each other and obtain final hologram with position,
Further, the hologram obtaining is loaded in single spatial light modulator, then RGB three beams playback light respectively the angular illumination when recording on hologram, obtaining coloured image apart from object plane.
(3) beneficial effect
The present invention compared with prior art, utilizes single spatial light modulator to realize color hologram 3D and shows in the technical scheme that the present invention proposes, simplified system, for the miniaturization of color hologram 3D display device provides a kind of effective approach.
On the PC that our program is is 2.6GHz at a kernel, move, the software of employing is Matlab2011b.Calculating for traditional color hologram, is generally that original color image is divided into RGB tri-colouring components, then calculates respectively and generates corresponding hologram.If without iteration optimization, the hologram that utilizes angular spectrum method to calculate three 1080 × 1080 pixels needs about 1.7 seconds altogether, but the color image quality of so rebuilding is very bad.In order to improve picture quality, the algorithm of general using iteration is optimized hologram, but like this can be very consuming time.And the method for utilizing us is calculated the hologram of 1080 × 1080 pixels and only needed about 1.3 seconds just passablely, and rebuild being of high quality of image.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is hologram record process schematic diagram of the present invention;
Fig. 2 is that 3D color body of the present invention reproduces process schematic diagram;
Fig. 3 is Color Full holography display system architectures schematic diagram of the present invention;
Fig. 4 is the hologram generative process schematic diagram of 3D color body of the present invention;
Fig. 5 is color 3D object optical reproduction result figure of the present invention, and wherein (a) focuses on " RMB ", (b), focuses on " YGC ".
Embodiment
Below in conjunction with drawings and Examples, embodiments of the present invention are described in further detail.Following examples are used for illustrating the present invention, but can not be used for limiting the scope of the invention.
The present invention can utilize single spatial light modulator to realize the demonstration of true color hologram three-dimensional, has greatly reduced the volume of color hologram three-dimensional display system; Obtain final hologram simultaneously and by the method for resolving, do not need iterative algorithm to be optimized hologram, thereby saved greatly the time of computed hologram.
The process of the calculating generative process of computed hologram as shown in Figure 1.
The first step: the 3D color body of object plane is divided into three components of red, green, blue, and propagates and arrive hologram page through space free respectively, the initial point of object plane is z to the initial point distance of holographic facet;
Second step: RGB three beams plane reference light respectively with different angular illumination at holographic facet, the object light color component corresponding with it interferes and obtains three holograms respectively, red reference light and object light red component interfere and obtain H
1(x, y, z), green reference light and object light green component interfere and obtain H
2(x, y, z), blue reference light and object light blue component interfere and obtain H
3(x, y, z);
The 3rd step: corresponding with it different colours component reference light is interfered and formed a hologram of hologram stack formation, then add a y direction of principal axis slanted phase factor on hologram, expression formula can be written as:
Wherein, k wherein
i=2 π/λ
i, λ
ifor wavelength, ψ is the axial angle of inclination of y, and it can make the zero order diffracted light of spatial light modulator be offset in the process of image reconstruction, and A (x, y) represents the distribution of amplitudes of hologram,
the position that represents hologram distributes mutually;
The 4th step: distribution of amplitudes is normalized, then multiplies each other and obtain final hologram with position,
Rebuild the process of 3D color body as shown in Figure 2.
The hologram obtaining is loaded in spatial light modulator, then RGB three beams playback light respectively the angular illumination when recording on hologram, can obtain apart from object plane the coloured image that we want.
Build a simple 3 D color object, utilize above-mentioned principle computed hologram and be loaded in spatial light modulator, the color hologram 3D picture that spatial light modulator is reappeared.As shown in Figure 3, in figure, BS is half-reflecting half mirror to Color Full holography display system architectures, the pure position phase LCD space light modulator that SLM is reflection-type.Three look laser are respectively by three coupling mechanism coupling output plane light waves, and they are radiated in spatial light modulator with different angles simultaneously.The coloured image of rebuilding reflexes to output plane through a BS, utilizes ccd detector to be used for recording experimental result.
Further illustrate the present invention with embodiment below.
We suppose that this 3D object is made up of front and back two pictures (being 1024 × 1024 pixels), are respectively z1=650mm and z2=500mm apart from the distance of holographic facet.Hologram size 8.64mm × 8.64mm, pixel count is 1080 × 1080, and holographic facet sampling interval is 8.0 μ m × 8.0 μ m, and the wavelength of three kinds of recording lasers of red, green, blue is still respectively λ
r=671nm, λ
g=532nm, λ
b=473nm, the incident angle of reference light Red and blue light is respectively 2 ° and-2 °, and green glow incident angle is 0 °.Utilize the method that we propose to calculate final hologram, hologram generative process as shown in Figure 4.And it is loaded in spatial light modulator.When RGB tri-look laser are during from the incident simultaneously of different angle, we just can obtain the three-dimensional body reproducing in output face, see Fig. 5 (a), focus on " RMB ", and 5 (b), focus on " YGC ".Thereby visible, color 3D object is compared clearly and reproduces out.
Above embodiment is only for the present invention is described, but not limitation of the present invention.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is carried out to various combinations, revises or is equal to replacement, do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of claim scope of the present invention.
Claims (2)
1. the method that color hologram real-time three-dimensional shows, is characterized in that, its step is as follows:
The first step: the 3D color body of object plane is divided into three components of red, green, blue, and propagates and arrive hologram page through space free respectively, the initial point of object plane is z to the initial point distance of holographic facet;
Second step: RGB three beams plane reference light respectively with different angular illumination at holographic facet, the object light color component corresponding with it interferes and obtains three holograms respectively, red reference light and object light red component interfere and obtain H
1(x, y, z), green reference light and object light green component interfere and obtain H
2(x, y, z), blue reference light and object light blue component interfere and obtain H
3(x, y, z);
The 3rd step: corresponding with it different colours component reference light is interfered and formed a hologram of hologram stack formation, then add a y direction of principal axis slanted phase factor on hologram, expression formula can be written as:
Wherein, k wherein
i=2 π/λ
i, λ
ifor wavelength, ψ is the axial angle of inclination of y, and it can make the zero order diffracted light of spatial light modulator be offset in the process of image reconstruction, and A (x, y) represents the distribution of amplitudes of hologram,
the position that represents hologram distributes mutually;
The 4th step: distribution of amplitudes is normalized, then multiplies each other and obtain final hologram with position,
2. the method showing according to the color hologram real-time three-dimensional of claim 1, it is characterized in that, the hologram obtaining is loaded in single spatial light modulator, then RGB three beams playback light respectively the angular illumination when recording on hologram, obtaining coloured image apart from object plane.
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| CN105824128A (en) * | 2016-05-20 | 2016-08-03 | 北京理工大学 | 3D augmented reality display system based on complex-amplitude grating modulation |
| CN105938318A (en) * | 2016-05-30 | 2016-09-14 | 苏州大学 | Color holographic three-dimensional display method and system based on time division multiplexing |
| CN106773046A (en) * | 2016-12-26 | 2017-05-31 | 北京理工大学 | A kind of complex amplitude modulates holographic ultra-thin waveguide augmented reality display system and method |
| CN109270816A (en) * | 2018-08-16 | 2019-01-25 | 中国科学院光电研究院 | A kind of method for generating holograms and color holographic display system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105938318B (en) * | 2016-05-30 | 2018-06-12 | 苏州大学 | Color holographic three-dimensional display method and system based on time division multiplexing |
| CN106773046A (en) * | 2016-12-26 | 2017-05-31 | 北京理工大学 | A kind of complex amplitude modulates holographic ultra-thin waveguide augmented reality display system and method |
| CN106773046B (en) * | 2016-12-26 | 2021-03-30 | 北京理工大学 | Complex amplitude modulation holographic ultrathin waveguide augmented reality display system and method |
| CN109270816A (en) * | 2018-08-16 | 2019-01-25 | 中国科学院光电研究院 | A kind of method for generating holograms and color holographic display system |
| CN109270816B (en) * | 2018-08-16 | 2024-01-23 | 中国科学院光电研究院 | Hologram generating method and color holographic display system |
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