Classifications

• • 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
  • G03H1/32—Systems for obtaining speckle elimination
• • 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
  • G03H1/0808—Methods of numerical synthesis, e.g. coherent ray tracing [CRT], diffraction specific
• • 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
  • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
  • G03H1/2249—Holobject properties
• • 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
  • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
  • G03H1/2294—Addressing the hologram to an active spatial light modulator
• • 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
  • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
  • G03H1/2202—Reconstruction geometries or arrangements
  • G03H2001/2236—Details of the viewing window
  • G03H2001/2242—Multiple viewing windows
• • 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
  • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
  • G03H1/2249—Holobject properties
  • G03H2001/2263—Multicoloured holobject
• • 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
  • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
  • G03H1/2249—Holobject properties
  • G03H2001/2263—Multicoloured holobject
  • G03H2001/2271—RGB holobject
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2210/00—Object characteristics
  • G03H2210/40—Synthetic representation, i.e. digital or optical object decomposition
  • G03H2210/45—Representation of the decomposed object
  • G03H2210/452—Representation of the decomposed object into points
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2210/00—Object characteristics
  • G03H2210/40—Synthetic representation, i.e. digital or optical object decomposition
  • G03H2210/45—Representation of the decomposed object
  • G03H2210/454—Representation of the decomposed object into planes
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2226/00—Electro-optic or electronic components relating to digital holography
  • G03H2226/05—Means for tracking the observer
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2240/00—Hologram nature or properties
  • G03H2240/50—Parameters or numerical values associated with holography, e.g. peel strength
  • G03H2240/62—Sampling aspect applied to sensor or display

Definitions

• the invention relates to a device for generating a holographic
• the invention also relates to a method for generating a holographic reconstruction of a scene with which speckle patterns can be reduced.
• Fields of application of the invention are devices with which the storage and reconstruction of complex wavefronts of a three-dimensional scene by holography using coherent laser light in real time or close to real time and in which the reconstruction of a visibility area, which is also referred to as a viewer window, can be seen.
• a light modulation means with controllable elements is provided to modulate the wavefronts of the incident coherent light with the complex values of the scene.
• holographic display in which the method of the invention can be used is known from earlier documents by the Applicant, e.g. from (1) EP 1 563 346 A2, (2) DE 10 2004 063 838 A1 or (3) DE 10 2005 023 743 A1.
• a hologram computation is performed on the following basis:
• a three-dimensional scene is decomposed for encoding and holographic reconstruction into sectional planes containing a plurality of object points of the scene.
• the object points characterize both the area and in the sum of all areas the spatial scene. They are written into various controllable elements of the light modulation means with complex values, and form in the light modulation means for each Object point a separate area. Such a separate area is called the
• the sub-hologram corresponds approximately to a holographically coded
• Lens function which reconstructs this one object point at its focal point.
• the amount of complex values, ie the amplitude, is over the extent of the
• phase distribution of the complex values in the region of the sub-hologram corresponds approximately to the function of a lens whose focal length is from the axial
• the complex values written to the controllable elements of the sub-hologram change the amplitude and / or phase of the light.
• the object point can be reconstructed.
• Subhologram has this object point in the light modulation means the value zero.
• the overall coded hologram of the scene is obtained by adding up the complex values of the individual sub-holograms.
• the holographic reconstruction of the scene is generated by a reconstruction means in a reconstruction space spanned by the visibility area and the light modulation means.
• the wavefronts emanating from the coded holograms of the scene are superimposed in the visibility range, so that the reconstructed object points can be seen there from an eye position.
• the reconstruction from the superimposed modulated wavefronts is generated by creating for each eye of a viewer in time or space multiplex different perspective views of the scene that differ in parallax but are seen by the brain as a single holographic SD representation.
• the viewer can either look at a light modulation means in which a hologram of the scene is directly encoded and which serves as a screen. This is called a direct-view setup. Alternatively, the viewer may look at a screen onto which either an image or a transform of the hologram values encoded in the light modulation means is projected. This is called projection construction.
• the eye positions of observers are determined in a known manner by a position finder, which is program-technically, ie software-coupled, with a memory means and a computing unit and a system control means.
• the information of the object points required for calculating the CGH of the scene is also stored in data records as a look-up table.
• a granular-like interference pattern is generally understood to be a speckle pattern that arises as a spatial structure with randomly distributed intensity minima and maxima due to the interference of many light waves with statistically irregularly distributed phase differences. These speckle patterns disturb the quality of perception of the reconstructed scene.
• Reducing the speckle patterns in the reconstruction of the 3D scene can be achieved in principle by temporal and / or spatial averaging. In doing so, the eye of the beholder always averages several reconstructions shown to him, each of which has a different speckle pattern. For example, the speckle pattern is random and different if the object points of the scene have different random phases. By averaging, the viewer perceives a reduction in the speckle pattern.
• Donghyun Kim's document "Reduction of coherent artifacts in dynamic holographic three-dimensional displays by diffraction-specific pseudorandom diffusion” describes temporal averaging for the reduction of bacon patterns, with various holograms of a scene being calculated and displayed one after the other, with the individual object points
• CGH computer-generated holograms
• the holographic representation of the scene as a whole should be seen in good quality in such a designed holographic reconstruction device.
• the basic method of the invention for hologram calculation and holographic reconstruction of a three-dimensional scene is explained in the prior art. It is based on the fact that the scene is composed of objects and these in turn are object points. To reconstruct the scene, various means are provided, which are combined in system control means or interact with them.
• object points can be selected and grouped into object point groups, and the object point groups to be calculated and displayed as a single CGH.
• the interaction of the various means achieves a superimposition of lightwave fronts of the individual object group reconstructions so that the eyes of an observer see the resulting reconstruction of the scene in an eye position.
• the object is achieved by a device in which both the selection of object points in the cutting planes on the basis of the grid and the compilation of the object points to object point groups by system control means in response to the visible resolution of the reconstruction of the scene.
• system control means in response to the visible resolution of the reconstruction of the scene.
• a grid dimension for the object points is generated in each section plane, with which neighboring object points in the section plane can not be resolved separately by the viewer, and the collection of object points of the respective section plane ensues into an object point group having such object points which are separated for the viewer are resolvable.
• each object point of the decomposed scene is selected for reconstruction. This advantageously ensures that each object point is assigned only once to an object point group and fewer holograms from
• a position finder for acquiring the data of the current eye position of at least one observer and the current size of the eye pupil of this observer is provided in the device.
• computing units are provided in the device in order to use the distance of the current eye position from the respective sectional plane of the scene and the current pupil diameter of a viewer to calculate an object point density with which the grid dimension for the object points in the respective sectional plane is determined by the system control means.
• the current pupil diameter can also be determined via a brightness value in that the position finder has a sensor for detecting a current brightness value of the scene to be reconstructed or the ambient light in a reconstruction space.
• the visible resolution of the reconstruction of the scene can be adapted to the imaging properties of the reconstruction means.
• the point spread function (PSF) for a mapping of the light source into the respective cutting plane can be calculated or determined experimentally by means of a combination of the reconstruction means and a lens encoded in the light modulation means either with suitable optical software.
• the lateral distances of the object points which characterize the visible resolution can be taken from the simulation or the measurement curve and stored in the corresponding data records of the storage means.
• the system control means select the object points in a sectional plane both as a function of a current eye position of the observer and as a function of the resolving power of the reconstruction means and assemble them into object point groups.
• the device according to the invention is further designed such that the system control means control the coding of the CGH in the light modulation means and the subsequent reconstruction of the object point groups of the scene.
• the object point groups are coded two-dimensionally in the light modulation means. However, they can also be coded one-dimensionally in the light modulation means.
• the object of the invention is likewise achieved by a method for the holographic reconstruction of a scene, the method steps of which can be carried out essentially with the means already described of the device.
• the method is characterized in that the system control means both make the selection of object points in the cutting planes on the basis of the grid and the combination of the object points to object point groups depending on the visible resolution of the reconstruction of the scene.
• the system control means generate accordingly
• the process step of incoherent superimposition of the individual reconstructions can be carried out in a time-sequential manner, so that the eyes of the observer temporally record the intensity of the reconstruction over the sum of the intensities of the individual reconstructions.
• the light modulation means consists of a plurality of light modulators, in which a CGH is simultaneously coded. With this CGH, several individual reconstructions with mutually different bacon patterns are generated simultaneously with the corresponding number of reconstruction means and their lightwave fronts are simultaneously superimposed at the location of the eye position.
• the visible resolution of the reconstruction of the scene can be adapted to the resolution of the light modulation means.
• a method for the holographic reconstruction of a colored scene in which the color scene is divided into different color components programmatically in the system control means and the color reconstruction of the scene is produced from at least two different monochrome reconstructions of different wavelengths of light, wherein Each color component is a separation of the scene into object points, a compilation of the object points to object point groups and a calculation of monochrome CGH is done separately.
• Another, expedient method step provides that in the data sets of the object points for each wavelength of the three primary colors the same grid dimensions for the grid and for the object point groups the same minimum distances are specified by the arithmetic units.
• the grid dimension for the object points of the scene in the arithmetic units is defined so small that the object points do not exist for the wavelengths of the three primary colors can be resolved separately. Furthermore, as the second criterion to be fulfilled, the minimum distance of the object points within an object point group in the arithmetic units is defined so large that the object points can be resolved separately for the wavelengths of the three primary colors.
• CGH computer generated holograms
• FIG. 1 shows the course of the amplitude of the Airy function for two object points which are no longer resolved separately
• FIG. 2 the calculated intensities for a destructive and a constructive one
• FIG. 3 shows a simulation of the reconstruction of a planar scene of object points calculated with random phases with an object point spacing according to FIGS. 1 and 2.
• FIG. 4 shows the analog overlays for a fourfold greater distance between the two object points 2,
• FIG 5 is a simulation of the reconstruction of a planar scene of random points calculated object points with an object point distance of FIG 4
• Figure 6 shows a simulation of a reconstruction in which 16 individual reconstructions were generated and incoherently superimposed
• Fig. 7 is a schematic representation of the main components of a holographic display according to the invention.
• the holographic reconstruction device comprises at least one light modulation means, a reconstruction means and a light source means, which may be formed in one or more parts. Furthermore, system control means are provided, which have a plurality of storage means and arithmetic units, in order to execute and coordinate the program-specific calculations and sequences in the holographic reconstruction device.
• the invention will be described in the process mainly at two object points that serve as a representative of the entire scene described.
• disturbing interference maxima and interference minima between individual object points of a scene are caused by the diffraction of the coherent light of the light source means.
• the invention eliminates the speckle patterns by adjusting the resolution of the reconstruction of the scene to the resolution visible to the eye or to the imaging properties of the reconstruction means or to the resolution of the light modulation means.
• the object points of the scene must satisfy two different criteria, which are discussed in more detail in the exemplary embodiments.
• a viewer sees a reconstruction with his eye pupil.
• the pupil acts as a diffraction-limiting opening.
• r ⁇ (x ⁇ , y ⁇ ) is the coordinate of an object point and r-r ⁇ is the distance from this coordinate within a sectional plane of the scene, and j1 is one
• Bessel function Unless otherwise limited by the reconstruction means, the observer sees an object point as a diffraction disk.
• D denotes the distance between the plane of the current eye position and the respective sectional plane, lambda the wavelength of the light and dp the diameter of the eye pupil.
• Fig. 1 the amplitude curves of two object points are shown, whose distance is 1, 0 lambda D / dp. The amplitudes overlap clearly and can no longer be perceived separately by the viewer's eyes.
• FIG. 2 shows the calculated intensities for a destructive and a constructive interference as well as for an incoherent superimposition of the object points from FIG. 1 at one location.
• the incoherent overlay corresponds approximately to the expected value for a two-dimensional scene. If you capture more than two object points with this distance next to each other in the grid, you get in the generated reconstruction of these object points a contiguous area with approximately constant intensity.
• the intensity for the general case of a coherent superposition - depending on the relative phase of both object points - lies between the extreme cases of destructive and constructive interference.
• the interference in the coherent superposition of several object points would cause a speckle pattern. The viewer sees the reconstruction of the scene according to FIG.
• This viewer window VW is usually slightly larger than the eye pupil.
• Decisive for the type of interference occurring is the optical path difference of the light from different object points OP to the viewer window VW.
• FIG. 3 shows a simulation of the reconstruction of a planar scene, ie a two-dimensional arrangement, of object points calculated with random phases for an object point spacing according to FIGS. 1 and 2. As a result, a disturbing speckle pattern is seen instead of a desired uniformly bright surface.
• This speckle pattern is due to the interference of the two object points. If the viewer moved in the viewer window, the speckle pattern would change.
• the visible resolution of the reconstruction of the scene must be adjusted either to the resolution of the eye or e.g. be adapted to the resolution or the imaging properties of the reconstruction means.
• the values of the intensities for the constructive and destructive interference and also the value of the incoherent superposition of both object points differ only slightly from each other. The two object points are thus clearly separated in the reconstruction.
• FIG. 5 shows a simulation of the reconstruction of a two-dimensional arrangement of object points calculated with random phases for an object point distance according to FIG. 4.
• the object points can be recognized individually. Due to the larger distances of the object points to each other, a speckle pattern no longer occurs.
• FIG. 6 shows a simulation of a reconstruction in which 16 individual replicas of 16 holograms were generated and superimposed incoherently.
• the hologram shown in Fig. 5 was used for simulation.
• a grid for the object points with a grid dimension of 1.0 lambda D / dp in horizontal and vertical direction was generated for a surface, representative of a sectional plane.
• the object points were assembled into 16 object point groups. Within an object point group, the object points have a minimum distance of 4.0 lambda D / dp in the horizontal and vertical directions. From this 16 holograms were calculated.
• the reconstructions of all 16 holograms were superimposed intensity incoherently. That is, the intensities of the individual reconstructions have been added up to a resulting intensity. The result is a reconstructed surface which is uniformly lighter and thus contains substantially less speckle pattern than FIG.
• FIG. 7 shows the main components of a holographic display according to the invention as a direct view display.
• LQ is a light source means
• RM is a reconstruction means
• SLM is a light modulating means
• SM system control means SE is one of the many cutting planes with object points OP
• VW is a viewer window
• AP is an eye position in the observer window VW.
• the section plane has the distance D from the observer window VW and the eye pupil is shown with the diameter dp.
• a reconstruction space spans, in which a viewer sees the reconstructed scene from the eye position AP. Two object points are shown so close in the section plane that they can not be resolved separately by the viewer. The other two object points are more distant from each other and belong to an object point group.
• the system control means generate a grid of intersection points of horizontal and vertical lines in a sectional plane the scene.
• a current eye position of a viewer is assumed.
• the viewer must be in a fixed position.
• the distance is determined by a position finder.
• the pupil size of the observer is needed to perform the calculations.
• a typical diameter of the eye pupil is assumed, or the diameter of the current eye pupil is also determined by the position finder or an intended sensor and stored in memory means.
• Another possible device for determining the current size of the eye pupil is designed such that a sensor detects the current brightness value of the scene to be reconstructed or the ambient light in a reconstruction space and supplies it to the arithmetic units which calculate the pupil size therefrom. Subsequently, the grid dimension for the respective sectional plane and the minimum distance of the object points for the calculation of the individual CGH are adapted to this value by the system control means.
• the computing units as part of the system control means calculate with the distance of the eye position of each of a sectional plane of the scene and the pupil diameter an object point density which is denser than the resolution of the eye. On the basis of the object point density, the system control means determines the grid size for adjacent object points in the respective sectional plane.
• the lines of the grid run parallel to each other in each direction and have the same grid size among each other. Due to the different spacing of the individual cutting planes to the eye position of the respective viewer, the grid dimensions of the individual cutting planes differ.
• Object points in adjacent raster positions of a sectional plane have horizontally and vertically a lateral distance from one another, by means of which they can no longer be resolved separately relative to a defined axial distance of the eye from this sectional plane. Several adjacent points are then perceived as a contiguous area.
• the first criterion of the invention based on the object point density, met.
• the data characteristic of an object point to be reconstructed are stored in storage means of the system control means in a data record and can be retrieved there programmatically.
• the object point density must be reduced in accordance with the second criterion of the invention in order to be able to clearly see the object points clearly separated in the reconstruction. Therefore, such object points of a sectional plane are combined into object point groups, which have a distance from one another on the basis of the stored data, with which they are seen separately resolved for a viewer at a defined axial distance to this sectional plane.
• a computer-generated hologram is calculated from each object point group and coded into a light modulation means, to the coherent light of a
• the light modulation means comprises controllable elements, e.g. regularly arranged pixels.
• a one-dimensional coding for example, 2, 3 or 4 object point groups, for a two-dimensional coding 4, 9, or 16
• Object point groups compiled and calculated as holograms.
• the number of individual to be generated is correspondingly large
• a reconstruction means of the holographic device generates a single reconstruction of each object point group.
• the system control means overlays the reconstructions incoherently, whereby a single holographic reconstruction of the scene is seen in the plane of the current eye position of a viewer.
• the incoherent superimposition of the individual reconstructions in the eye position can on the one hand be performed time sequentially.
• the individual reconstructions are overlaid incoherently in time so quickly that the eyes of the Observers temporally the intensity of the reconstruction over the sum of the intensities of the individual reconstructions mittein.
• the incoherent superimposition of the individual reconstructions can be carried out at the same time by simultaneously generating a plurality of individual reconstructions with a plurality of light modulators and a plurality of reconstruction means and superimposing them incoherently at the location of the eye position.
• Object points of the scene that meet the two listed criteria have little or no speckle patterns in their reconstruction. In both cases, a viewer sees from the current eye position, the reconstruction of the entire scene averaged only with low speckle pattern.
• the visible resolution of the reconstruction of the scene is adapted to the visible resolution of a reconstruction means.
• the reconstruction optics is a component of the reconstruction means. It can e.g. also be reconstructed by the spatial extent of the light source or by a non-ideal representation of the written values on the SLM or by aberrations in the reconstruction optics widened a single object point.
• the visible resolution of the object point is then diffraction-limited not given by the eye pupil.
• the initial object point density should be chosen such that the object points actually reconstructed by the entire reconstruction device are no longer separated, but are still perceived as a contiguous surface.
• At least one measurement curve for the reconstruction of a single object point is recorded with the envisaged reconstruction optics for the holographic reconstruction and stored in the storage means.
• a parameter calculated from the measurement curve which characterizes the object point, can also be stored in the storage means.
• the system control means determine the density of object points and insert in dependence on a current eye position of the observer Grid for the object points of the scene. As already described in the first embodiment, then the object point density must be reduced again.
• object points are selected with a defined distance from one another and assembled in such a way to object point groups that they are individually resolved recognizable.
• the coding in the light modulation means and the reconstruction of the individual object point groups are carried out analogously to the process sequences described in the first embodiment of the invention, taking into account the imaging quality of the reconstruction means.
• the simulation of the properties of the device for reconstruction occurs.
• the visible resolution of the reconstruction of the scene can be adapted to the resolution of the light modulation means.
• the reconstruction of the scene is visible from the eye position in the viewer window.
• the two pixels are controllable elements of the light modulation means, in which a complex-valued number is encoded.
• the viewer window is generally rectangular in shape.
• the perceptible resolution of the scene is determined by the extent of the observer window and not by the visible resolution of the eye pupil. If the observer window is smaller than the diameter of the eye pupil in both dimensions, the product of two sinc functions sinc (D lambda / vw_h) sinc (D lambda / vw_v) takes the place of the Airy function, for example.
• the device according to the invention and the corresponding method are then to be modified analogously to this resolution.
• a device and a method for holographic reconstruction of a colored scene are provided.
• the decomposition of the colored scene is done programmatically in the system control means in different proportions of the colors provided.
• the color reconstruction of the scene is generated from at least two different monochrome reconstructions of different wavelengths of light. For each color component, a decomposition of the scene into object points, a compilation of the object points to object point groups, and a calculation and encoding of the monochrome CGH are carried out separately analogously to the description of the first embodiment of the invention.
• the arithmetic units for carrying out the reconstruction method specify different grid dimensions for each wavelength of the primary colors used for the grid, and different minimum distances for the object point groups.
• the same grid dimensions and for the object point groups equal minimum distances can be specified by the arithmetic units.
• the grid dimension for the object points of the scene in the arithmetic units is advantageously defined so small that the object points can no longer be resolved separately for the wavelengths of the primary colors used.
• the second criterion of the method is realized in that the distance between the object points within an object point group in the arithmetic units is defined so large that the object points can be resolved separately for the wavelengths of the three primary colors.
• a holographic reconstruction device can be designed as a transmissive or reflective holographic display and can be designed both for a viewer and for several observers.

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• 2007
  • 2007-07-27 DE DE102007036127A patent/DE102007036127A1/de not_active Withdrawn
• 2008
  • 2008-07-25 DE DE502008002689T patent/DE502008002689D1/de active Active
  • 2008-07-25 CN CN200880100780XA patent/CN101809511B/zh active Active
  • 2008-07-25 KR KR1020107004235A patent/KR101511397B1/ko active Active
  • 2008-07-25 EP EP08786426A patent/EP2181361B1/de active Active
  • 2008-07-25 WO PCT/EP2008/059765 patent/WO2009016105A2/de not_active Ceased
  • 2008-07-25 US US12/670,886 patent/US8441703B2/en active Active
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