CN107490948A - A kind of adjustable phase type hologram type method for rebuilding the three-dimensional scenic angle of visual field - Google Patents
A kind of adjustable phase type hologram type method for rebuilding the three-dimensional scenic angle of visual field Download PDFInfo
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- CN107490948A CN107490948A CN201710885741.6A CN201710885741A CN107490948A CN 107490948 A CN107490948 A CN 107490948A CN 201710885741 A CN201710885741 A CN 201710885741A CN 107490948 A CN107490948 A CN 107490948A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000000007 visual effect Effects 0.000 title claims abstract description 44
- 230000000694 effects Effects 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 9
- 239000000047 product Substances 0.000 description 6
- 238000004422 calculation algorithm Methods 0.000 description 5
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- 238000012986 modification Methods 0.000 description 3
- 230000008447 perception Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000001093 holography Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 208000003464 asthenopia Diseases 0.000 description 1
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0476—Holographic printer
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
- G03H1/0866—Digital holographic imaging, i.e. synthesizing holobjects from holograms
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
- G03H1/0866—Digital holographic imaging, i.e. synthesizing holobjects from holograms
- G03H2001/0883—Reconstruction aspect, e.g. numerical focusing
Abstract
The invention discloses a kind of adjustable phase type hologram type method for rebuilding the three-dimensional scenic angle of visual field, including：S1：Three-dimensional scenic is produced using 3D auxiliary softwares or produce objective things cloud data using laser scanner according to demand；S2：Three-dimensional scenic or objective things cloud data are sampled, and utilize point source method generation phase hologram；S3：Spatial light modulator loads phase hologram, evaluates rebuilding three-dimensional scenic definition, spatial resolution etc., and selection is rebuild the best hologram of effect and printed；S4：Parameter by changing system reaches the angle of the required angle of visual field；S5：Reconstruction three-dimensional scenic effect is detected and applied.The invention belongs to phase type volume holographic printing technique, improves and calculates the practical application that hologram three-dimensional is shown, contributes to the development and raising of hologram type technology, have the following advantages that：Increase space-bandwidth product, the three-dimensional scenic angle of visual field is rebuild in regulation.
Description
Technical field
The present invention relates to hologram type field, and in particular to a kind of phase type of the adjustable reconstruction three-dimensional scenic angle of visual field is complete
Cease Method of printing.
Background technology
Dimension display technologies have broad application prospects in fields such as military and national defense, culture and education health cares.It is three-dimensional
Display Technique provides three-dimensional scenic depth perception, and what human visual system experienced is figure of the three-dimensional world to two-dimensional projection
Picture, and by the process of two dimensional image cognition three-dimensional world.Human perception nature depth is due to that images of left and right eyes viewing real world has
Slight difference, brain are merged the two, are obtained 3 D stereo and are felt.Existing ripe dimension display technologies such as binocular vision
Poor display, body Three-dimensional Display etc. can not all provide the full depth information required for human eye perception three-dimensional, the easily production of viewing time length
Raw visual fatigue.With the development of computer technology and spatial light modulator device, hologram can be uploaded to caused by calculating
Spatial light modulator realizes Three-dimensional Display.Hologram three-dimensional is calculated to show due to not constrained by conventional recording medium and orientation element
The display requirement of complex object can be met.But the angle of visual field for calculating hologram three-dimensional display system is limited by spatial light modulator
System, so set forth herein a kind of phase type hologram type method that can change the angle of visual field.
The one dimensional linear array or two-dimensional array that spatial light modulator target surface is made up of many separate units, separate unit can be
The junior unit physically split or continuous entirety.Due to the resolution ratio and input picture or signal of device material
Limited spatial resolution, and junior unit one by one is formed, it is a kind of device that the spatial distribution of light wave can be modulated, energy
Conversion or the tune of room and time are carried out to the one-dimensional or Two dimensional Distribution of the phase of light wave, amplitude or intensity, frequency, polarization state etc.
System, it is with the function for controlling the electrically or optically room and time of signal intensity that it, which exports optical signal,.Spatial light modulator is believed in optics
In breath processing or optical interconnection system, they can be used as the entering apparatus of system, can also be used as conversion or arithmetic unit in systems.
Herein its be used as transform operation device, by changing the phase of light wave, three-dimensional information is loaded into emergent light, and with reference
Light interferes in volume holographic material, and record three-dimensional information is in material.Because the space-bandwidth product of spatial light modulator has
Limit and the angle of visual field is limited, so a kind of phase type hologram type method that can change the angle of visual field has very big practical significance.
Point source method is that the phase type hologram type method of the generation change angle of visual field is loaded into the phase type of spatial light modulator
One of algorithm of hologram.Point source method thinks that a three-dimensional body is a preferable diffuser, three-dimensional body can be regarded as
Multiple discrete points, each point are construed as a spot light that can be lighted, and each spot light spreads out by Fresnel
It is a spherical wave distribution to be mapped to up to holographic facet, all discrete points is done the spherical wave complex amplitude of fresnel diffraction arrival holographic facet
Superposition obtains the hologram of three-dimensional body.It is to use computer programming simulated optical holographic recording process to calculate holography, is used in combination
The mode of coding makes hologram.Calculate holography is not influenceed workable, repeatable row height, cost by laboratory environment
It is high.
Holographic from conventional photographic to calculating, we find the application point of its mutual supplement with each other's advantages in hologram type.Although a lot
Field achieves certain achievement, but the speed for calculating holographic generation hologram is limited by holographic computational algorithm and hardware, is led
Hologram type is caused not improve.For optimized algorithm, print speed is improved with look-up table in computed hologram.Each
Contribution of the discrete point to hologram prestores in a computer, is only needed in storage device until needing and producing hologram
Required point reads out and is overlapped the hologram that can obtain three-dimensional body.Improve the holographic generation hologram of calculating
Speed, printing display effect need also exist for improving, presently, there are two problems：
(1) spatial light modulator space-bandwidth product is restricted
(2) the spatial light modulator angle of visual field in space is restricted
The content of the invention
It is contemplated that at least solves one of above-mentioned technical problem.
Therefore, it is an object of the invention to propose a kind of adjustable phase type hologram type for rebuilding the three-dimensional scenic angle of visual field
Method, the angle of visual field for alloing to rebuild three-dimensional scenic in hologram type reaches required angle, and improves space-bandwidth product, improves three
Tie up display quality.
To achieve these goals, embodiment of the invention discloses that a kind of adjustable phase for rebuilding the three-dimensional scenic angle of visual field
Bit-type hologram type method, comprises the following steps：S1：Three-dimensional scenic is produced using 3D auxiliary softwares or utilize laser according to demand
Scanner produces objective things cloud data；S2：Three-dimensional scenic or objective things cloud data are sampled, and utilize point source
Method generates phase hologram；S3：Spatial light modulator loads phase hologram, to rebuilding three-dimensional scenic definition, spatial discrimination
Rate etc. is evaluated, and selection is rebuild the best hologram of effect and printed；S4：Parameter by changing system regards needed for reaching
The angle of rink corner；S5：Reconstruction three-dimensional scenic effect is detected and applied.
Further, in step S1：The 3D auxiliary software produces three-dimensional scenic or objective using laser scanner generation
Things cloud data is the text for supporting point, straight line, polygon, surface and free form curve.
Further, in step s 2, the sampling process is interval identical only to three-dimensional scenic or objective things point
Cloud data form the uniform sampling at model composition midpoint.
Further, in step s3, described using spatial light modulator is high-light-energy utilization rate and high-diffraction efficiency
Liquid crystal type phase spatial light modulator.
Further, in step s 4, the parameter of the system is realized by micro structure in change system.
The phase type hologram type method of the adjustable reconstruction three-dimensional scenic angle of visual field according to embodiments of the present invention, have with
Lower advantage：
(1) present invention is printed using phase type spatial light modulator, improves the whole efficiency of the system of hologram type,
Emergent light carries out record printing with reference light transmitting interference in holographic material, can reach complete real 3D visual effect,
The interference of conjugate image factor is eliminated, greatly improves display quality.
(2) present invention is accelerated to algorithm by look-up table, carried using the method generation phase hologram of point source method
The bulk velocity of high print system.Three-dimensional body is defined as a preferable diffuser, regards multiple discrete points, Mei Gedian as
It is considered a spot light, it is a spherical wave distribution that each spot light reaches holographic facet by fresnel diffraction, each
The spherical wave that individual discrete point does fresnel diffraction arrival holographic facet maps to obtain the hologram of a discrete point.Compiled using computer
Journey simulated optical holographic recording process, and make hologram with the mode of coding.When need produce hologram when only need from
The point of required calculating is read out in storage device and is overlapped to obtain three-dimensional scenic hologram, subtracts operation time
Few, system print speed increases.
(3) present invention stores three-dimensional scene information using phase type hologram, and conjugate image band can be eliminated in print procedure
The interference come.Because hologram does not store the information in addition to phase information, reduced so data volume is relative, improve system print
Speed.
(4) present invention uses the Method of printing of reflection-type, can be in reference light or general when loading reference light or ordinary light source
The homonymy in thang-kng source reconstructs three-dimensional scenic, facilitates observer to watch.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Substantially and it is readily appreciated that, wherein：
Fig. 1 is the flow of the phase type hologram type method of the adjustable reconstruction three-dimensional scenic angle of visual field of the embodiment of the present invention
Figure；
Fig. 2 is point source method flow chart；
Fig. 3 is reflective holographic printing schematic diagram；
Fig. 4 is that the angle of visual field changes model；
Fig. 5 is spatial light modulator angle of visual field figure；
Fig. 6 is to change angle of visual field index path；
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is to be understood that term " first ", " second " are only used for describing purpose, and can not
It is interpreted as indicating or implying relative importance.
With reference to following description and accompanying drawing, it will be clear that these and other aspects of embodiments of the invention.In these descriptions
In accompanying drawing, some particular implementations in embodiments of the invention are specifically disclosed, to represent to implement the implementation of the present invention
Some modes of the principle of example, but it is to be understood that the scope of embodiments of the invention is not limited.On the contrary, the present invention
Embodiment includes all changes, modification and the equivalent fallen into the range of the spirit and intension of attached claims.
The present invention is described below in conjunction with accompanying drawing.
Fig. 1 is the flow of the phase type hologram type method of the adjustable reconstruction three-dimensional scenic angle of visual field of the embodiment of the present invention
Figure.As shown in figure 1, a kind of adjustable phase type hologram type method for rebuilding the three-dimensional scenic angle of visual field, comprises the following steps：
S1：Three-dimensional scenic is produced using 3D auxiliary softwares or produce objective things point cloud using laser scanner according to demand
Data.
S2：Three-dimensional scenic or objective things cloud data are sampled, and utilize point source method generation phase hologram.
Specifically, three-dimensional scenic or cloud data sampling, comprise the following steps with point source method generation phase hologram：
Three-dimensional scenic or objective things cloud data are converted to and support that point, straight line, polygon, surface and free form are bent
The text of line；
Point data is extracted to the data in text, between-line spacing of going forward side by side uniformly is sampled；
Change of scale is carried out to the point data after sampling, model size is met spatial light modulator and is required with printing；
The phase type computed hologram (such as Fig. 2) of generation three-dimensional scenic is calculated using point source method.
S3：Spatial light modulator loads phase hologram, comments rebuilding three-dimensional scenic definition, spatial resolution etc.
Valency, selection are rebuild the best hologram of effect and printed.
Specifically, hologram print procedure comprises the following steps：
Phase type spatial light modulator loads phase type hologram, and phase type spatial light modulator reads electric signal to reflect
Mode changes beam phase, produces three-dimensional scenic.
Using the light beam for changing phase as object light, interfered with reference light in material homonymy, realize hologram type (as schemed
3)。
S4：Parameter by changing system reaches the angle of the required angle of visual field.
Specifically, change system parameter reach needed for the angle of the angle of visual field comprise the following steps：
Fourier lense is placed on the direction of spatial light modulator emergent light, spatial light modulator is placed on fourier lense
Front focal plane, rebuild ripple back focal plane (such as Fig. 4) is transferred to by fourier lense.
Focal length by changing fourier lense changes the angle of visual field of printed material and improves space-bandwidth product.By space
Optical modulator is placed on the front focal plane of fourier lense, and rebuilding ripple by fourier lense is transferred to back focal plane.
Change the angle of visual field by changing the focal length of lens
S5：Reconstruction three-dimensional scenic effect is detected and applied.
In one embodiment of the invention, in step s 2, point data carry out change of scale be using actual size as
Foundation does change of scale in proportion.
In one embodiment of the invention, in step s 4, the method for comparing is pre- more than error to remove error
If the data of value, are solved, the data of three obtained dimension are integrated, and obtain virtual value with form and aspect scale.
To make those skilled in the art further understand the present invention, will be described in detail by following examples.
As shown in figure 5, β angles are that the spatial light modulator angle of visual field can be obtained by formula (1) in figure：
Wherein fmaxIt is spatial light modulator maximum spatial frequency, d is spatial light modulator size.
Fourier lense is placed before spatial light modulator, the angle of visual field and space-bandwidth product can be modulated, such as Fig. 6 institutes
Show, θ angles can be obtained for the printing angle of visual field by formula (2) in figure：
Wherein l is spatial light modulator size.
The printing angle of visual field can be changed by the focal length for changing fourier lense.
Spatial light modulator is located at front focal plane, it is necessary to which the hologram three-dimensional scene of printing is located at back focal plane, and its size can be by public affairs
Formula (3)：
Wherein w is hologram three-dimensional scene size.
The phase type hologram type method of the adjustable reconstruction three-dimensional scenic angle of visual field according to embodiments of the present invention, have with
Lower advantage：
(1) algorithm that the present invention is combined using point source method with look-up table produces phase type hologram, quickly calculates correct
Three-dimensional scenic hologram, eliminate the interference of conjugate image, facilitate hologram type to be shown with holographic, real 3D vision can be reached
Effect.
(2) present invention is printed using phase type spatial light modulator, improves the whole efficiency of the system of hologram type,
Emergent light carries out record printing with reference light transmitting interference in holographic material, eliminates the interference of conjugate image factor, greatly improves
Display quality.
(3) present invention uses the Method of printing of reflection-type, can be in reference light or general when loading reference light or ordinary light source
The homonymy in thang-kng source reconstructs three-dimensional scenic, meets the observation habit of spectators, and conveniently visual enjoyment is provided for spectators.
(4) present invention uses the method by changing fourier lense focal length, and the printing angle of visual field, which is reached, needs angle same
Shi Zengjia space-bandwidth products.Therefore a customizable angle of visual field three has also been provided the user while display quality is improved
Tie up scene.
In addition, the phase type hologram type method for being used for the adjustable reconstruction three-dimensional scenic angle of visual field of the embodiment of the present invention
Other compositions and effect are all known for a person skilled in the art, in order to reduce redundancy, are not repeated.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of departing from the principle and objective of the present invention a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The scope of invention is by claim and its equivalent limits.
Claims (6)
- A kind of 1. adjustable phase type hologram type method for rebuilding the three-dimensional scenic angle of visual field, it is characterised in that including following step Suddenly：S1：Three-dimensional scenic is produced using 3D auxiliary softwares or produce objective things point cloud number using laser scanner according to demand According to；S2：Three-dimensional scenic or objective things cloud data are sampled, and utilize point source method generation phase hologram；S3：Spatial light modulator loads phase hologram, evaluates rebuilding three-dimensional scenic definition, spatial resolution etc., Selection is rebuild the best hologram of effect and printed；S4：Parameter by changing system reaches the angle of the required angle of visual field；S5：Reconstruction three-dimensional scenic effect is detected and applied.
- 2. the adjustable phase type hologram type method for rebuilding the three-dimensional scenic angle of visual field according to claim 1, its feature It is, in step S1：The 3D auxiliary software produces three-dimensional scenic or produces objective things cloud data using laser scanner It is the text for supporting straight line, polygon, surface and free form curve.
- 3. the adjustable phase type hologram type method for rebuilding the three-dimensional scenic angle of visual field according to claim 1, its feature It is, in step s 2, the sampling process only forms mould for interval identical to three-dimensional scenic or objective things cloud data The uniform sampling at type composition midpoint.
- 4. the phase type hologram type method of the described adjustable reconstruction three-dimensional scenic angle of visual field according to claim 1, Characterized in that, in step s3, described is the liquid crystal type of high-light-energy utilization rate and high-diffraction efficiency using spatial light modulator Phase spatial light modulator.
- 5. the phase type hologram type method of the described adjustable reconstruction three-dimensional scenic angle of visual field according to claim 1, Characterized in that, in step s 4, the parameter of the system is realized by micro structure in change system.
- 6. the adjustable phase type hologram type method for rebuilding the three-dimensional scenic angle of visual field according to claim 1, its feature It is, hologram type is the printing of phase type volume holographic, is printed by the interference with reference light.
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| CN108364266A (en) * | 2018-02-09 | 2018-08-03 | 重庆大学 | The flow passage structure minimizing technology of cell holographic reconstruction observation is carried out using micro-fluidic chip |
| CN108594618A (en) * | 2018-04-04 | 2018-09-28 | 东南大学 | A method of expanding the holographic retina image-forming of field angle |
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Application publication date: 20171219 |