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For synthetically generating a hologram

Subclass of:

359 - Optical: systems and elements

359001000 - HOLOGRAPHIC SYSTEM OR ELEMENT

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DocumentTitleDate
20100039686HOLOGRAM PATTERN GENERATION METHOD AND MULTIPLE LIGHT POINTS GENERATION APPARATUS - In order to change the number of light points and light intensities and to move positions of the light points in a real-time manner, an extremely large capacity of a memory is required. In a method according to the present invention, a memory (02-18-2010
20100097671Head-Mounted Display Device for Generating Reconstructions of Three-Dimensional Representations - A head-mounted display device for generating reconstructions of three-dimensional representations comprising a frame, in which at least one light source, at least one optical system and at least one encodable light modulator are situated, wherein the light modulator with an encoding of a wavefront of the three-dimensional representation in the encoding area is positioned at the place of an observer window defined in an observer plane or the light modulator with an encoding of a hologram of the wavefront of the three-dimensional representation in the encoding area is positioned in the region closely in front of the observer window for transforming the hologram into the observer window. When the light modulators are illuminated, complex wavefronts of the three-dimensional representation are situated in the observer window and the reconstruction of the three-dimensional representation is visible in a visual cone spanned by the observer window and the light modulator.04-22-2010
20100014135FABRICATION METHOD FOR A COMPUTER-GENERATED HOLOGRAM OR A HOLOGRAPHIC STEREOGRAM IN WHICH A THREE-DIMENSIONAL OBJECT HAVING VISUALIZED CROSS-SECTIONAL SURFACES IS RECORDED, AND COMPUTER-GENERATED HOLOGRAM/HOLOGRAPHIC STEREOGRAM IN WHICH A THREE-DIMENSIONAL OBJECT HAVING VISUALIZED CROSS-SECTIONAL SURFACES IS RECORDED - The present invention relates to a method for fabricating a computer-generated hologram or a holographic stereogram which can reconstruct a three-dimensional object having visualized cross-sectional surfaces, wherein the three-dimensional object composed only of surface data is processed to have the visualized cross-sectional surfaces on a given cross section thereof by adding surface data to the cross-sectional surfaces. The method includes a step (ST01-21-2010
20080259419COMPUTER GENERATED HOLOGRAM - A three dimensional display apparatus includes a diffraction panel for displaying a computer generated hologram and a look-up table. The look-up table includes a plurality of phase entries corresponding to a plurality of image points within a three dimensional image replay volume of the computer generated hologram. The apparatus further includes one or more processors configured to notionally divide the computer generated hologram into one or more hogels and to calculate diffraction fringe information for at least one of the hogels based on a selection of the phase entries.10-23-2008
20100079830DEVICE FOR OPTICALLY DETECTING POSITION AND/OR ORIENTATION OF OBJECTS AND ASSOCIATED DETECTION METHODS - The present invention relates to a device for optically detecting position and/or attitude of an object (04-01-2010
20100118360Method and Device for Reconstructing a Three-Dimensional Scene with Corrected Visibility - A method is disclosed for reconstructing a 3D scene made of object points in a holographic display, wherein the reconstruction is visible from a visibility region. Visibility and/or covering of parts of the 3D scene corresponding to the real parameters is realized, with the reconstruction, for a viewer from every place of the visibility region. Processor means generate a spatial point matrix for defining the positions of individual object points, which are assigned predetermined intensity and phase values. Within the visibility region, a complex-value wave front for each single object point is calculated. The intensity values of the object points are multiplied with the associated visibility function, to determine a common modified wave front of the object points, transformed into the plane of a light modulator to calculate modified control values for the object points.05-13-2010
20100073746HOLOGRAM AND HOLGRAPHIC VIEWING DEVICE INCORPORATING IT - The invention relates to a hologram that enables two or more different images to be simultaneously reconstructed even in a state where the hologram is fixed in terms of relative position with respect to an eye, and a holographic viewing device that incorporates it. The hologram 03-25-2010
20100073744Method for Generating Video Holograms in Real Time by Means of Subholograms - A method for generating video holograms in real time for a holographic playback device comprising at least one light modulator means, into which a scene divided into object points is encoded as an entire hologram and can be seen as a reconstruction from a visibility region, which is located within a periodicity interval of the reconstruction of the video hologram, the visibility region defining a sub-hologram together with each object point of the scene to be reconstructed, and the entire hologram being generated from a superposition of contributions of sub-holograms, is characterized in that for each object point the contributions of the sub-holograms in the entire reconstruction of the scene can be determined from at least one look-up table.03-25-2010
20100073745HOLOGRAM FABRICATION PROCESS, AND HOLOGRAM FABRICATED BY THAT PROCESS - The invention provides a hologram fabrication process, characterized by comprising steps of fabricating a computer-generated hologram (CGH) having amplitude information and phase information recorded by computer operation on a given recording surface, irradiating the computer-generated hologram (CGH) with the first reconstructing illumination light (03-25-2010
20100046051GENERATION OF A HOLOGRAM PATTERN - Device for generating a hologram pattern including selecting means for selecting, as cross section ranges which are in a plurality of cross sections parallel to hologram pattern in 3D object and which are ranges used for generating hologram pattern, cross section ranges which overlap ranges in other cross sections when the relevant cross section is perspectively seen from a predetermined observation point on the hologram pattern; depth integrating means for calculating, for lattice points in one cross section range, a depth integral function acquired by integrating an inverse diffraction function for determining hologram pattern for displaying points of 3D object with respect to respective lattice points in the cross section ranges which overlap the relevant lattice point; and inverse Fourier transform means for generating hologram pattern by performing two-dimensional inverse transform on depth integral functions with respect to plurality of lattice points in one cross section range.02-25-2010
20100046049COMPACT HOLOGRAPHIC DISPLAY DEVICE - A holographic display device comprises an OLED array writing onto an OASLM, the OLED array and OASLM forming adjacent layers. The OASLM encodes a hologram and a holographic reconstruction is then generated by the device when an array of read beams illuminates the OASLM. The OASLM is suitably controlled by the OLED array. An advantage of the device is that it lends itself to compactness.02-25-2010
20100046050COMPACT HOLOGRAPHIC DISPLAY DEVICE - Holographic display device comprising a first EASLM and a second EASLM, the pair permitting independent modification of phase and amplitude, in which holographic reconstruction is visible through one or more virtual observer windows. An advantage is that an observer may view a holographic reconstruction through one or more virtual observer windows from a device housing a pair of EASLMs which permit independent modification of phase and amplitude.02-25-2010
20100103485HOLOGRAPHIC DISPLAY DEVICE - A holographic display comprising light sources (L04-29-2010
20100097672Method and Device for Reducing Speckle - A method for reducing speckle patterns of a three-dimensional holographic reconstruction is disclosed. A controllable light modulator into which a three-dimensional scene is coded is illuminated by coherent light, a reconstruction means projects the modulated light close to an eye position into a space of observation and a control means controls the illumination. This provides a holographic reproduction device in which the speckle patterns occurring during reconstruction of a three-dimensional scene are reduced. Also provided is a next-to-real time method using a carrier medium of conventional image refresh rate.04-22-2010
20120262768STACKING A VISIBLE IMAGE AND A SYNTHETIC HOLOGRAM - The invention relates to a synthetic hologram consisting of an array of encoding cells, including a pattern in which the cells are inverted and have a phase modified by an offset value relative to the rest of the hologram.10-18-2012
20130070321HOLOGRAPHIC PROJECTION DEVICE FOR THE ENLARGEMENT OF A VISIBILITLY REGION - A holographic projection apparatus and a method is disclosed for magnifying a virtual visibility region, for observing a reconstructed scene with at least one light modulation device and with at least one light source having sufficiently coherent light for generating a wavefront of a scene that is coded in the light modulation device. By means of imaging the wavefront into a viewer plane, it is possible to generate the virtual visibility region for observing the reconstructed scene. The virtual visibility region has at least two virtual viewer windows. In this case, the virtual viewer windows are dimensioned such that the reconstructed scene can always be observed without tracking of the viewer windows upon movement of a viewer in the viewer plane.03-21-2013
20130070320Optical Processing - A modular routing node includes a single input port and a plurality of output ports. The modular routing node is arranged to produce a plurality of different deflections and uses small adjustments to compensate for wavelength differences and alignment tolerances in an optical system. An optical device is arranged to receive a multiplex of many optical signals at different wavelengths, to separate the optical signals into at least two groups, and to process at least one of the groups adaptively.03-21-2013
20110002019HOLOGRAPHIC IMAGE DISPLAY SYSTEMS - The invention relates to techniques for speckle reduction in holographic optical systems, in particular holographic image display systems. We describe a holographic image display system for displaying an image holographically on a display surface, the system including: a spatial light modulator (SLM) to display a hologram; a light source to illuminate said displayed hologram; projection optics to project light from said illuminated displayed hologram onto said display surface to form a holographically generated two-dimensional image, said projection optics being configured to form, at an intermediate image surface, an intermediate two-dimensional image corresponding to said holographically generated image; a diffuser located at said intermediate image surface; and an actuator mechanically coupled to said diffuser to, in operation, move said diffuser to randomise phases over pixels of said intermediate image to reduce speckle in an image displayed by the system.01-06-2011
20090303559SYSTEM, APPARATUS AND METHOD FOR EXTRACTING THREE-DIMENSIONAL INFORMATION OF AN OBJECT FROM RECEIVED ELECTROMAGNETIC RADIATION - An apparatus and method to produce a hologram of an object includes an electromagnetic radiation assembly configured to receive a received electromagnetic radiation, such as light, from the object. The electromagnetic radiation assembly is further configured to diffract the received electromagnetic radiation and transmit a diffracted electromagnetic radiation. An image capture assembly is configured to capture an image of the diffracted electromagnetic radiation and produce the hologram of the object from the captured image.12-10-2009
20120188620Laser image projection system applicable to the marking of objects and method for generating holograms - Laser image projection system applicable to the marking of objects and method for generating holograms may include a reflection spatial light modulator, laser beam irradiating means for irradiating laser light onto the reflection spatial light modulator at a certain incidence angle, controlling means connected to the reflection spatial light modulator, the controlling means controlling said reflection spatial light modulator to define a holographic diffraction pattern corresponding to the desired optical image intended to be irradiated onto the object, and focusing means for performing a Fourier transform of the phase-modulated laser light to transform it into the optical image and irradiate it focused onto said object, wherein said focusing means includes a Fresnel lens holographically defined onto the reflection spatial light modulator to thereby improve an efficiency in the use of the light energy irradiated by said irradiating means.07-26-2012
20110013244Controllable Deflection Device - A visibility region produced through superimposed light bundles is tracked within a large angular range in front of a light modulator through controllable electrowetting cells having a prism function. Negative effects of buckling of the light bundle cross section are minimized by deflecting the light bundle in the prism cell. Light bundles, modulated by a controllable light modulator, impinge the modulator cells with a defined intensity distribution and pass by a controllable deflection device including a prism cell and a controllable electrode arrangement that adjusts boundary surfaces between a plurality of non-mixable materials. The altered intensity distribution is compensated in the light path of the light bundle in the visibility region by reducing the intensities of secondary diffraction order maxima such that the effective surface of a modulator cell has a shape that is tailored to the altered intensity distribution.01-20-2011
20120224236SYSTEM, APPARATUS AND METHOD FOR EXTRACTING THREE-DIMENSIONAL INFORMATION OF AN OBJECT FROM RECEIVED ELECTROMAGNETIC RADIATION - An apparatus and method to produce a hologram of an object includes an electromagnetic radiation assembly configured to receive a received electromagnetic radiation, such as light, from the object. The electromagnetic radiation assembly is further configured to diffract the received electromagnetic radiation and transmit a diffracted electromagnetic radiation. An image capture assembly is configured to capture an image of the diffracted electromagnetic radiation and produce the hologram of the object from the captured image.09-06-2012
20090237759Display system for reproducing medical holograms - The invention relates to a display system for diagnostic image systems for reproducing three-dimensional medical images. The display system has at least one holographic projection facility that is connected to the diagnostic image system. The projection device reproduces a hologram of the three-dimensional medical images in an examination or intervention room.09-24-2009
20130188231APPARATUS AND METHOD OF GENERATING HOLOGRAM BASED ON PATTERN REUSE - An apparatus and method of generating a hologram based on pattern reuse may include a pattern generating unit to generate an initial hologram pattern corresponding to a three-dimensional (3D) object in a 3D space, and a pattern transformation unit to determine a transformation hologram pattern by transforming the generated initial hologram pattern.07-25-2013
20130188232SYSTEM, APPARATUS AND METHOD FOR EXTRACTING IMAGE CROSS-SECTIONS OF AN OBJECT FROM RECEIVED ELECTROMAGNETIC RADIATION - An apparatus and method to produce a hologram of a cross-section of an object includes an electromagnetic radiation assembly configured to receive a received electromagnetic radiation, such as light, from the object. The electromagnetic radiation assembly is further configured to diffract the received electromagnetic radiation and transmit a diffracted electromagnetic radiation. An image capture assembly is configured to capture an image of the diffracted electromagnetic radiation and produce the hologram of the cross-section of the object from the captured image. The hologram of the cross-section includes information regarding a single cross-section of the object.07-25-2013
20100172001DISPLAYING AN IMAGE - A target image 07-08-2010
20120188621HOLOGRAPHIC RECONSTRUCTION SYSTEM HAVING AN ENLARGED VISIBILITY REGION - The invention relates to a holographic reconstruction system for the reconstruction of scenes having at least one video hologram modulated wave front, and an enlarged visibility region. The system utilizes two-dimensional coded light modulator cells of spatial light modulation means and optical focusing means, which realize a Fourier transformation of the modulated wave front in their focal plane. First optical deflection means deflect the parallel disposed partial light waves such that their Fourier transformations appear as cascading in the focal plane. A spatial frequency filter located on the focal plane, lets each of the same diffraction orders of all modulated partial light waves pass, and second optical deflection means arrange the wave front strips next to each other at the modulated wave front, which reconstructs the scene.07-26-2012
20120188619Three-dimensional holographIC display using active shutter - A three-dimensional holographic image display device and a method using the same are provided. Light corresponding to left and right eye holograms is emitted according to a time division method and divided into a first path and a second path. Active shutters operate substantially in synchronization with the emitted left and right eye holograms to provide images to a user's left and right eyes.07-26-2012
20110026089VIDEO HOLOGRAM AND DEVICE FOR RECONSTRUCTING VIDEO HOLOGRAMS - The invention relates to video holograms and devices for reconstructing video holograms, comprising an optical system having a light source, lens and the video hologram having cells arranged in a matrix or a regular pattern with at least one opening per cell, the phase or amplitude of said opening being controllable. The holographic video representations of expanded spatial objects can be achieved in a wide viewing area in real time using controllable displays, whereby the objects are either computer-generated or created by different means. The space-bandwidth product (SBP) of the hologram is thus reduced to a minimum and the periodicity interval of the Fourier spectrum is used as a viewing window on the inverse transformation plane, through which the object is visible in the preceding space. The mobility of the viewer(s) is achieved by tracking the viewing window.02-03-2011
20090002787Holographic Display Devices - This invention relates to electronic devices incorporating a holographic projector. A holographic projection module for a consumer electronic device, the holographic projection module comprising: at least one substantially monochromatic light source (01-01-2009
20090180165Method for the Compensation of an Inhomogeneous Brightness Perception in Holographically Reconstructed Scenes - To compensate for an inhomogeneous brightness perception in a holographic reconstruction of 3D-scenes (07-16-2009
20100033780Method for Generating Computer-Generated Video Holograms in Real Time by Means of Propagation - The invention relates to a method for generating video holograms in real time for a holographic reproduction device using at least one light modulator means in which a scene split into object points is encoded as a whole hologram in the form of the reconstruction of a visibility region in a periodicity interval of the reconstruction of the video hologram. The reconstruction of an individual object point (OP) only requires part of the whole hologram encoded on the light modulator means. The invention is characterised in that, for each object point, the contributions for propagation of the light waves in the visibility region can be determined from at least one look-up table.02-11-2010
20100033783Enhanced Environment Visualization Using Holographic Stereograms - Hologram production techniques can combine source data representing realistic information describing an environment with source data providing representational information describing a feature of the environment and/or some object interacting with the environment. The combined data is used to produce holograms, and particularly holographic stereograms including features that enhance the visualization of the environment depicted in hologram. A haptic interface can be used in conjunction with such holograms to further aid use of the hologram, and to provide an interface to secondary information provided by a computer and related to the images depicted in the hologram.02-11-2010
20100033782Optical Wave Correction for a Holographic Projection System - A holographic projection system with an optical wave tracking system sets the propagation direction of a modulated wave uses a position control system and an eye finder. It provides an adjustable optical wave correction system which compensates for deformations of the wave which are dependent on the current eye position. Largely dynamic changes and deformations in the form structure of the modulated and conditioned wave are reduced, which result from changes in the propagation direction of the aligned, optically enlarged and modulated wave on a focusing display screen. The optical wave correction system includes adjustable wave form means and computer means which set the optical behaviour of the wave form means using the positional data from the current eye position. The adjustable wave form means are located in the light path between an illuminating system for the spatial light modulation means and the display screen of the projection system.02-11-2010
20110170153COMPUTER-GENERATED HOLOGRAM FOR RECONSTRUCTING A FULL-COLOR IMAGE WITH HIGH RESOLUTION AND ITS FABRICATION METHOD - A computer-generated hologram that is capable of reconstructing a full-color image and achieving a high resolution is provided. A recording plane of the hologram is divided by a multiplicity of parallel sections in the horizontal direction to define a multiplicity of areas. Amplitude information and phase information corresponding to different wavelengths which vary periodically in a direction traversing the multiplicity of areas, is recorded in the recording medium. Information about the same portion of the original image is recorded in individual points belonging to the same area, and information about another corresponding portion of the original image is recorded in individual points belonging to another area.07-14-2011
20090316239RECORDING APPARATUS AND RECORDING METHOD - A recording apparatus includes a drive unit that rotationally drives a holographic recording medium including a recording layer and a track forming layer that includes guide tracks formed at constant intervals in a radial direction, where a signal beam and a reference beam are emitted to the recording layer so that a hologram is recorded in accordance with the signal beam, a signal beam generating unit, a reference beam generating unit, a recording unit that emits the signal beam and reference beam into the medium and records the hologram, a rotation control unit that controls the drive unit so that the medium is rotationally driven at a constant rotation speed, and a recording control unit that selects some of the guide tracks so that radial-direction recording intervals of the holograms are statistically decreased towards the outer periphery and controls the recording unit to record the holograms along the selected tracks.12-24-2009
20090310197Reflective Optical System, Tracking System and Holographic Projection System and Method - The invention relates to an optical reflection system with a reflection element for reflecting reconstruction light waves, an entry-side focal point, from which the reconstruction light waves come when they hit the reflection element, and an exit-side focal point, to which the reconstruction light waves propagate after being reflected from the reflection element. The invention further relates to a tracking system and a holographic projection system with such optical reflection system, and a corresponding holographic projection method. In order to achieve with such an optical reflection system an aberration correction and a tracking of the visibility region and a reconstruction larger than with prior art devices, the optical reflection system according to this invention comprises a deflection element with optically controllable deflection properties and a deflection control means for optically controlling the deflection properties of the deflection element which controls the position of at least the exit-side focal point of the optical reflection system.12-17-2009
20100277779Light Modulating Device - The present invention relates to a light modulating device, comprising a SLM and a pixelated optical element, in which a group of at least two adjacent pixels of the SLM in combination with a corresponding group of pixels in the pixelated optical element form a macropixel, the pixelated optical element being of a type such that its pixels comprise a fixed content, each macropixel being used to represent a numerical value which is manifested physically by the states of the pixels of the SLM and the content of the pixels of the pixelated optical element which form the macropixel.11-04-2010
20100118359Holographic Projection Display with Corrected Phase Coding - A holographic projection display for reconstructing a 3D-scene and a coding method that indicates an improvement of the control value of coding through an iterative Fourier transformations-algorithm are disclosed. The display includes a reproduction system including at least two reproducing means. First reproduction means for reproducing the illuminating means and for the Fourier transformation of actual wave fronts modulated in the phase modulator follow a second reproduction means, that functions as a screen. The plane of the screen is a Fourier transformation plane for calculations with the iterative Fourier transformation-algorithm and the plane of the phase modulator (6) is the other Fourier transformation plane.05-13-2010
20110267663HOLOGRAPHIC IMAGE PROJECTION METHOD AND HOLOGRAPHIC IMAGE PROJECTION SYSTEM - Provided is a hologram-image projection method including a step of setting three-dimensional position information in a specimen for a plurality of focal points where laser light is to be focused via an objective lens; a step of performing reverse ray tracing from the individual focal points to an entrance pupil position of the objective lens by using the position information set for the individual focal points in the specimen, a refractive index of the specimen, and overall characteristic data of the objective lens, to calculate a wavefront of the laser light at the entrance pupil position from the individual focal points; a step of calculating a combined wavefront by combining the plurality of calculated wavefronts; a step of setting a phase pattern to be applied to a wavefront modulating device on the basis of the calculated combined wavefront; and a step of applying the set phase pattern to the wavefront modulating device, causing the laser light to be incident thereon, and focusing the laser light whose wavefront is modulated by the phase pattern on the specimen via the objective lens.11-03-2011
20120170088MEMS Spatial Light Modulator Driver Calibration Systems - We describe a method of compensating for long-term mechanical property changes in an analogue optical MEMS SLM. In embodiments the SLM comprises multiple piston-type actuation optical phase modulating pixels each having a mirror with a variable height determined by an analogue voltage applied to a corresponding pixel electrode. The method comprises performing initial calibrations of the analogue displacement and pixel capacitance versus analogue voltage to determine a relationship between the pixel capacitance and analogue displacement, and then updating the displacement-voltage capacitance using the initial calibration data and a later calibration of the analogue voltage-capacitance characteristic of a pixel.07-05-2012
20090290203Method and Device for Computing Computer-Generated Video Holograms - The data defining an object to be holographically reconstructed is first arranged into a number of virtual section layers, each layer defining a two-dimensional object data sets, such that a video hologram data set can be calculated from some or all of these two-dimensional object data sets. The first step is to transform each two-dimensional object data set to a two-dimensional wave field distribution. This wave field distribution is calculated for a virtual observer window in a reference layer at a finite distance from the video hologram layer. Next, the calculated two-dimensional wave field distributions for the virtual observer window, for all two-dimensional object data sets of section layers, are added to define an aggregated observer window data set. Then, the aggregated observer window data set is transformed from the reference layer to the video hologram layer, to generate the video hologram data set for the computer-generated video hologram.11-26-2009
20090296176Method and Device for Reducing Speckle - A method for reducing speckle patterns of a three-dimensional holographic reconstruction is disclosed. A controllable light modulator into which a hologram of a three-dimensional scene is coded is illuminated by coherent light, a reconstruction lens transforms the modulated light into an eye position and reconstructs the three-dimensional scene in a reconstruction space and a control means controls the illumination. This provides a holographic reproduction device in which the speckle patterns occurring during reconstruction of a three-dimensional scene are reduced. According to one embodiment, a next-to-real time method is presented using a carrier medium of conventional image refresh rate.12-03-2009
20100103486Device for the Production of Holographic Reconstructions with Light Modulators - A device for the production of holographic reconstructions having light modulators is disclosed. The device comprises at least one pixelated light modulator illuminated by at least one light source, and a focusing optical element field arrangement which images the light sources in an image plane after the light modulator. For the reconstruction, only one order of diffraction of the Fourier spectrum of the hologram should be used. The light modulator is provided with an assigned filter-aperture field arrangement which is located in the area of the image plane of the light source images and which has a plurality of aperture openings. Said aperture openings are designed in such a way that they each allow the passage of a prespecified area of the overall dimensions either smaller or the same as a diffraction order of the diffraction spectrum following Fourier transformation and produced from the holographic coding of the light modulator.04-29-2010
20110267665APPARATUS AND METHOD FOR RECORDING FRESNEL HOLOGRAMS - An apparatus for producing a hologram of an object includes a light source that emits an incoherent electromagnetic wave toward the object, and a masking device configured to display a mask, receive the incoherent electromagnetic wave emitted toward the object, mask the received incoherent electromagnetic wave according to the displayed mask, and produce a masked electromagnetic wave. The apparatus also includes an image recording device configured to capture an image of the masked electromagnetic wave, and a processing device configured to convert the image of the masked electromagnetic wave into the hologram of the object. A method for producing a hologram of an object is also described.11-03-2011
20110267664METHOD FOR PREPARING A HOLOGRAM RECORDING MEDIUM - Two original images to be recorded are prepared as data (S11-03-2011
20080278780HOLOGRAPHIC IMAGING SYSTEMS - A holographic imaging system includes an electrical addressable spatial light modulator (EASLM) and an optically addressable spatial light modulator (OASLM). A read light is configured to illuminate the OASLM, and a controller is configured to address the EASLM with both positive and negative sub-images and transmit the positive and negative sub-images to the OASLM. The controller is further configured to address the OASLM with an operating voltage, wherein the read light generates a holographic image comprised of diffraction patterns from the positive and negative sub-images.11-13-2008
20080204834Displaying holographic images - There is provided a method of displaying a holographic image, the method comprises a number of steps. Three-dimensional object data is manipulated (08-28-2008
20080247013IMAGE TRANSFER APPARATUS - An apparatus includes a light source configured to provide a path of light and a spatial light modulator located in the path of light and configured to modulate the light source. Relay optics are configured to receive the modulated light from the spatial light modulator and to project a computer generated image to a nominal image plane. The light source is configured to illuminate the spatial light modulator with collimated light.10-09-2008
20080247012VARIABLE OPTICAL PHASE MODULATOR - A variable optical phase modulator includes an array of movable, micro-electromechanical conductive plates. Each conductive plate has a substantially reflective surface, and is responsive to an applied voltage to move the conductive plate normal to a plane of the array to a predetermined distance with respect to other conductive plates in the array. The phase modulator also includes a voltage controller associated with the array of conductive plates. The voltage controller supplies a voltage to at least one of the movable conductive plates to move and position the movable plate to change the phase of electromagnetic energy reflected from the reflective surface with respect to the phase of electromagnetic energy reflected from other conductive plates in the array.10-09-2008
20090128872Method of forming an image and image projection device - A method of forming an image comprising providing a device for imparting respective phase shifts to different regions of an incident wavefront, wherein the phase shifts give rise to an image in a replay field, and causing zero-order light to be focused into a region between the replay field and the device.05-21-2009
20120069412HOLOGRAPHIC IMAGING SYSTEMS - A holographic imaging system includes an electrical addressable spatial light modulator (EASLM) and an optically addressable spatial light modulator (OASLM). A read light is configured to illuminate the OASLM, and a controller is configured to address the EASLM with both positive and negative sub-images and transmit the positive and negative sub-images to the OASLM. The controller is further configured to address the OASLM with an operating voltage, wherein the read light generates a holographic image comprised of diffraction patterns from the positive and negative sub-images.03-22-2012
20130215483PLASMONIC MODULATOR AND OPTICAL APPARATUS INCLUDING THE SAME - A plasmonic modulator and an optical apparatus including the same are provided. The plasmonic modulator includes a first metal layer, and a second metal layer facing the first metal layer. The plasmonic modulator further includes a refractive index varying layer disposed between the first and second metal layers and including a varying refractive index, and an insulating nitride layer disposed between the refractive index varying layer and the first metal layer.08-22-2013
20090086296Holographic Projector for Enlarging a Reconstruction Zone - This invention relates to a holographic projection device with an array of mirror elements in the form of micro-mirrors. The holographic projection device comprises at least one light modulator device, which contains the array of mirror elements, for an enlargement of a reconstruction space for a reconstructed scene. Each mirror element is coupled with at least one actuator. The actuators tilt the corresponding mirror elements and/or displace them axially in at least one direction. Thereby, a wave front for the representation of a reconstructed scene is directly modulated. The holographic projection device comprises an optical system for the projection of the modulated wave front into at least one observer window in an observer plane.04-02-2009
20090103151HOLOGRAPHIC PROJECTION METHOD AND HOLOGRAPHIC PROJECTION DEVICE - According to the present invention, video image data is converted into spatial frequency information using Fourier transformation. The spatial frequency information is provided to information display unit. The spatial frequency information as a phase distribution is displayed on the information display unit, light is irradiated onto the information display unit using a light source, the amount of light that is irradiated by the light source is adjusted based on the video image data. And diffraction light, which is irradiated by the light source and modulated as the spatial frequency information by the information display unit is projected onto projecting unit.04-23-2009
20090244665COMPUTER-GENERATED HOLOGRAM - For the purpose of preparing a computer-generated hologram, which has very high resolution and many numbers of parallaxes, the present invention provides a computer-generated holographic stereogram, wherein a virtual point light source group (10-01-2009
20090219592FABRICATION PROCESS FOR CHOLESTERIC LIQUID CRYSTAL MEDIA HAVING A VOLUME HOLOGRAM - The invention provides a process capable of fabricating a cholesteric liquid crystal medium having a volume hologram with efficiency yet without recourse to complicated steps such as an alignment step. This is achievable as follows. A volume hologram layer is formed on a substrate, and a cholesteric liquid crystal layer is then formed on another substrate comprising a center substrate film that is subjected to bondable treatment. The volume hologram layer is applied to the center substrate film that is subjected to bondable treatment, and placed in a state where the volume hologram layer and cholesteric liquid crystal layer are laminated together via the substrate. The substrate is peeled off the volume hologram layer, and an adhesive layer is formed on the surface of the volume hologram layer off which the substrate is peeled off, followed by the provision of the substrate on the adhesive layer. Finally, the multilayer structure is shaped into a label form of cholesteric liquid crystal medium having a volume hologram layer.09-03-2009
20090219591METHODS AND APPARATUS FOR DISPLAYING COLOUR IMAGES USING HOLOGRAMS - We describe a method of projecting a colour image on a screen holographically. The method includes: inputting colour image data including data for at least two colour planes of said image, a first, longer wavelength colour plane and a second, shorter wavelength colour plane; generating data for respective first and second holograms from said first and second colour planes, said first hologram having a greater resolution than said second hologram; and displaying said first and second holograms in turn on a common spatial light modulator (SLM) illuminated by light of respective said first and second wavelengths to project said colour image onto said screen; and wherein a scaling in resolution between said first and second holograms is dependent on scaling between said first and second wavelengths such that, when projected on said screen pixels of said image generated by said first and second holograms have substantially the same pitch.09-03-2009
20090219590METHOD AND APPARATUS FOR THE PRODUCTION OF POLARIZATION HOLOGRAMS - The present invention relates to a method for the production of polarization holograms, an apparatus for the production of polarization holograms and the use of the polarization holograms according to the invention as data stores, security features or diffractive optical elements for performing conventional optical functions.09-03-2009
20120105929Apparatus and method for displaying holographic image using collimated directional blacklight unit - A holographic three-dimensional (3D) image generating apparatus that may use a collimated directional blacklight unit (CD BLU) is provided. The CD BLU may output a collimated light of which an emitting light is adjusted. The convergent lens may enable the outputted collimated light to converge into a viewing area of a viewer and thus, a viewing window may be generated. A spatial light modulator (SLM) may perform spatially-varying modulation with respect to the collimated light converging into the viewing area to generate a focused beam.05-03-2012
20090257104Hologram Viewing Arrangement and Alignment Device - The present invention relates to a hologram viewing arrangement, to an alignment device, to a display device, to a device for aligning first and second members and to a device for aligning an optical beam with a desired target. A hologram viewing arrangement comprising a pixellated phase mask substrate (10-15-2009
20110228365COMPUTER IMPLEMENTED METHOD FOR GENERATING BINARY HOLOGRAMS - A numerical method of recording a two or three dimensional object scene in a binary hologram. When the binary hologram is illuminated with a reference beam, the original object scene can be reconstructed and observed by a viewer. As the hologram is binary, i.e. composed of black or white pixels, it can be printed with commodity printers. The process is simple, fast, and economical, hence decreasing the cost and time for hologram design and production. In addition, with binary holograms, the ability to store the holograms is enhanced and binary holograms facilitate efficient transmission of the holograms.09-22-2011
20100188718Method and Apparatus for Generating Reconstructions of Information Encoded in Ambient Light Modulators - The present invention relates to a method and device for the generation of reconstructions of information encoded on spatial light modulators by way of illumination with coherent incident waves. The invention includes the following steps: Splitting of the incident wave into at least two incident sub-waves, Modulation of the incident sub-waves with the help of selected apodisation functions so to form modulated incident sub-waves, Direction of the modulated incident sub-waves towards the corresponding, spatially separated and pixel-matrix-shifted spatial light modulators, Diffraction of the modulated incident sub-waves at the encoded pixels of the respective spatial light modulators, Additive combination of the sub-waves emitted by the respective spatial light modulators to form one common emitted wave, and Transformation of the emitted wave into the Fourier plane with the help of a projection system.07-29-2010
20100014134HOLOGRAPHIC IMAGE DISPLAY SYSTEM - This invention relates to holographic image display systems, and to related methods and processor control code. We describe a method of displaying an image holographically, the method including: inputting display image data defining said image for display; processing said image data to determine first image data representing a first spatial frequency portion of said image data and second image data representing a second spatial frequency portion of said image data, wherein said second spatial frequency is higher than said first spatial frequency; displaying a hologram of said first image data on a spatial light modulator (SLM) to form a holographically-generated intermediate real image; modulating said intermediate real image using said second image data to display said image.01-21-2010
20100238528METHOD AND SYSTEM FOR ELECTROHOLOGRAPHIC DISPLAY WITH ZEROTH-ORDER DIFFRACTION SUPPRESSION - An electroholographic display system (09-23-2010
20100232000Spatial Light Modulator Using Electrowetting Cells - A spatial light modulator for modulating light field amplitude comprises a surface relief grating adapted to act as a diffractive lens, where a material is used to fill at least one groove of a surface grating structure, such that a controllable refractive index birefringence of the material inside the surface relief grating is controlled by an electric field, which leads to a controllable intensity at a fixed focal point.09-16-2010
20110058239METHOD OF PRODUCING A MICROSTRUCTURED PRODUCT - The present invention provides a method of producing a two-sided microstructured product and a registration structure that can be used for the method. The method comprises the steps of: (03-10-2011
20100149609Method for Generating Video Holograms in Real-Time for Enhancing a 3D-Rendering Graphic Pipeline - A method for generating video holograms is disclosed, principally for a holographic reproduction device, having at least one light modulator in which a scene which is deconstructed into object points is encoded as a complete hologram and can be viewed as a reconstruction from a visibility region. A 3D-rendering graphic pipeline determines color and depth information for the object points of the scene, from which a holographic pipeline determines the complex hologram values.06-17-2010
20100128334Holographic recording apparatus, holographic reproduction apparatus, information encoding method, recording method, and information reproduction - A holographic recording and reproduction apparatus (05-27-2010
20100165428Device for Minimizing Diffraction-Related Dispersion in Spatial Light Modulators - A device for minimizing diffraction-related dispersion in spatial light modulators for holographically reconstructing colored representations is disclosed, and comprises a spatial light modulator designed as a diffractive optical element and provided with controllable structures, and at least one light source illuminating the spatial light modulator. Wavelength-dependent visible ranges associated with a predefined higher order of diffraction have a lateral chromatic offset relative to the position of the extensions of said visible ranges at a defined viewer's level, said lateral chromatic offset being in relation to the normal line to the surface of the spatial light modulator. The quality of reconstruction is improved regardless of the direction of incidence and emergence of the light.07-01-2010
20100208315COMPUTER GENERATED HOLOGRAM, GENERATION METHOD, AND EXPOSURE APPARATUS - The present invention provides a computer generated hologram which forms a light intensity distribution on a predetermined plane by giving a phase distribution to a wavefront of incident light, the hologram comprising a plurality of anisotropic cells each including an anisotropic medium configured to change a polarization state of the incident light, and a plurality of isotropic cells each including an isotropic medium configured not to change a polarization state of the incident light, wherein a linearly polarized light component, in a first direction, of the incident light forms a first light intensity distribution on the predetermined plane, and a linearly polarized light component, in a second direction perpendicular to the first direction, of the incident light forms a second light intensity distribution different from the first light intensity distribution on the predetermined plane.08-19-2010
20100033781Method and Apparatus for Encoding Computer-Generated Holograms in Pixelated Light Modulators - The object is to largely eliminate the errors which arise in the reconstruction of a hologram, calculated point by point, as a result of the encoding of said hologram into pixels of finite extent. The invention achieves the object by means of a method in which the common wavefront calculated from the object sectional planes is multiplied by the inverse transform of the pixel shape and pixel transparency in the viewer's window before the wavefront modified by the multiplication is transformed to the hologram plane and encoded as an amplitude and/or phase distribution of the hologram in the pixels of the light modulator. This method is implemented in a corresponding apparatus which contains an additional memory unit for providing a Fourier transform or its inverse Fourier transform and also a multiplication unit.02-11-2010
20100079832LASER PROCESSING APPARATUS AND LASER PROCESSING METHOD - A laser processing apparatus 1 includes a laser light source 04-01-2010
20100328742HOLOGRAM, HOLOGRAM DATA GENERATION METHOD, AND EXPOSURE APPARATUS - The present invention provides a hologram which forms a light intensity distribution on a predetermined plane by using an incident light. The hologram includes a plurality of cells configured to control both a phase of a first polarized light component of the incident light and a phase of a second polarized light component. The plurality of cells are designed to form a portion in an overlap region in which a first light intensity distribution region formed on the predetermined plane by the first polarized light component and a second light intensity distribution region formed on the predetermined plane by the second polarized light component are superposed on each other. The phase of the first polarized light component is diffused in the portion formed in the overlap region.12-30-2010
20090034036COMPUTER GENERATED HOLOGRAM, EXPOSURE APPARATUS, AND DEVICE FABRICATION METHOD - The present invention provides a computer generated hologram which forms a light intensity distribution on a predetermined plane by giving a phase distribution to a wavefront of incident light, comprising an anisotropic layer whose refractive index with respect to linearly polarized light in a first direction is different from a refractive index of the anisotropic layer with respect to linearly polarized light in a second direction perpendicular to the linearly polarized light in the first direction, and an isotropic layer whose refractive index with respect to the linearly polarized light in the first direction is equal to a refractive index of the isotropic layer with respect to the linearly polarized light in the second direction.02-05-2009
20130155476SYSTEM OF DISPLAYING DIGITAL HOLOGRAM BASED ON PROJECTION AND METHOD THEREOF - Disclosed are a system and a method for performing buoyance of a 3D hologram image on a hologram display screen in a projection mode. A system of displaying a digital hologram includes: a composite hologram unit configured to generate a hologram array by receiving hologram data of a fringe pattern and by compositing background image and a foreground image using the received fringe pattern; a hologram projection unit configured to project a hologram image through a wide-angle lens by applying a light to the hologram array; and a hologram display unit configured to perform space buoyance of the hologram image projected by the hologram projection unit on a 3D hologram display screen. The digital hologram content is managed in real time by using the present disclosure, and transmission of the digital hologram content to a remote place and site adaptive display of hologram image media may be achieved.06-20-2013
20090219589Three-dimensional image display and three-dimensional image displaying method - The present invention relates to a three-dimensional image displaying apparatus, or the like, that has a simple structure capable of displaying a high-quality reconstruction image by effectively making use of the focusing function of the observer's eyes. The three-dimensional image displaying apparatus comprises a spatial light modulation element, an illumination optical system, and a lens as a reconstruction image converting optical system. At least one of the bright point interval and initial phase values of the respective bright points constituting a target reconstruction image to be displayed is set such that peaks of the reconstruction light reaching a region, where the observation of reconstruction image obtained through diffraction of a specified order in the spatial light modulation element is permitted, are produced at different plural points on the back focal plane of the lens. As a result, a hologram capable of displaying the target reconstruction image is expressed by the spatial light modulation element. The amplitude or phase of the illumination light that enters the spatial light modulation element expressing the hologram is modulated by each pixel. The modulated light, that is, the reconstruction light is wavefront-converted by the lens and thereby the reconstruction image is formed. The observer, whose eye pupil is disposed close to the aperture portion of the mask, can observe a displayed reconstruction image through the aperture portion and a half mirror.09-03-2009
20100238527HOLOGRAPHIC DISLPAY USING LIQUID CRYSTAL DISPLAY DEVICE OPERATING WITH UNPOLORIZED LIGHT - An electroholographic display system (09-23-2010
20100220372COMPUTER GENERATED HOLOGRAM AND EXPOSURE APPARATUS - The present invention provides a computer generated hologram which forms a light intensity distribution on a predetermined plane by giving a phase distribution to a wavefront of incident light, the hologram comprising a first anisotropic cell and second anisotropic cell configured to change a polarization state of the incident light, and a first isotropic cell and second isotropic cell configured not to change the polarization state of the incident light, wherein a direction of an optic axis of the first anisotropic cell is different from a direction of an optic axis of the second anisotropic cell, and a thickness of the first isotropic cell is different from a thickness of the second isotropic cell.09-02-2010
20110176190SPECKLE-NOISE REDUCTION IN HOLOGRAPHIC PROJECTIONS - A method for reconstructing a holographic projection comprising providing a single hologram, providing at least one cyclic shift of at least a portion of the single hologram in the space domain, and reconstructing a cyclically shifted hologram by applying said cyclic shift on said portion.07-21-2011
20120120466WAVELENGTH-TUNABLE LASER SYSTEM - A wavelength-tunable laser system includes an optical fiber collimator array having at least two ports, an optical amplifier connected to one port of an optical fiber, an optical coupler for coupling light incident from the optical amplifier and transmitting the coupled light to another port, a diffraction grating plate for guiding each wavelength component of light incident from the optical fiber collimator array in a different direction, and an Opto-Very Large Scale Integration (Opto-VLSI) processor.05-17-2012
20110149359ILLUMINATION DEVICE WITH A FILTERING DEVICE - An illumination device having a filtering device is configured such that the filtering device comprises an optically addressable spatial light modulator with a filtering aperture which is generated by addressing. The position of the filtering aperture within the Fourier plane and/or the size of the filtering aperture is controlled by the control unit. The light modulator is addressed such that the position of the filtering aperture in the Fourier plane corresponds with the position of the intermediate image of the activated light source. At the same time the position of the imaged intermediate image corresponds with the detected position in the observer plane, and the size of the filtering aperture is determined by maximal one diffraction order of the light which is diffracted by the electrically addressable spatial light modulator. The field of application of this invention includes holographic projection displays.06-23-2011
20100296142Apparatus and Method to Align the Elements of a Holographic Information Data Storage System - A method to align the write channel portion of a holographic data storage system. The method establishes a write threshold correlation factor, provides a reference beam, and illuminates a holographic data storage medium encoded with a write reference orientation image with the reference beam to generate a write channel alignment data beam including a projected write reference orientation image. The method projects the write channel alignment data beam onto an optical detector, and calculates a first write correlation factor using the projected write reference orientation image, a stored write reference orientation image, and the tangential matched filter. If the method determines that the first write correlation factor is greater than or equal to the write threshold correlation factor, then the method determines that the spatial write channel is properly aligned.11-25-2010
20100097673HOLOGRAPHIC IMAGE DISPLAY SYSTEMS - This invention relates to methods and apparatus for the holographic display of images. We describe a method of compensating for spatial phase non-uniformities in a holographic image display system, the system including a substantially coherent light source illuminating an SLM (04-22-2010
20090009834OPTICAL PHASE PROCESSING IN A SCATTERING MEDIUM - An optical phase processing system for a scattering medium. A first beam has a direction and a wavefront and the first beam is configured to enter a holographic recording medium. A scattering medium is illuminated by a signal beam generating at least one scattered beam. An interference pattern is recorded from the at least one scattered beam and the first beam. A second beam is generated in a direction opposite to the direction of the first beam, the second beam having a wavefront and a phase substantially opposite to a phase of the wavefront of the first beam, and the second beam is configured to enter the holographic recording medium. The second beam and the interference pattern interact to generate at least one reconstructed beam having a phase substantially opposite to a phase of the at least one scattered beam, and the at least one reconstructed beam is configured to be viewable through the scattering medium.01-08-2009
20080252950Video Hologram and Device for Reconstructing Video Holograms for Large Objects - A video holographic display device operates so that the size of a reconstructed three dimensional scene is a function of the size of the hologram-bearing medium; the reconstructed three dimensional scene can then be anywhere within a volume defined by the hologram-bearing medium and a virtual observer window through which the reconstructed three dimensional scene must be viewed. This contrasts with conventional holograms, in which the size of the reconstructed scene is localised to a far smaller volume and is not a function of the size of the hologram-bearing medium at all.10-16-2008
20080204833APPARATUS AND METHOD FOR RECORDING FRESNEL HOLOGRAMS - An apparatus for producing a hologram of an object includes a light source that emits an incoherent electromagnetic wave toward the object, and a masking device configured to display a mask, receive the incoherent electromagnetic wave emitted toward the object, mask the received incoherent electromagnetic wave according to the displayed mask, and produce a masked electromagnetic wave. The apparatus also includes an image recording device configured to capture an image of the masked electromagnetic wave, and a processing device configured to convert the image of the masked electromagnetic wave into the hologram of the object. A method for producing a hologram of an object is also described.08-28-2008
20110096381HOLOGRAPHIC DIRECT VIEW DISPLAY HAVING AN APOLIZATION DEVICE - The invention relates to apodization in a holographic direct view display. Known apodization functions are utilized/modified for an apodization mask such that the functions reduce the intensities of selected higher magnitudes of diffractions. The holographic direct view display comprises a controllable light modulator having modulator cells and modulating impinging coherent light into a phase and/or amplitude, and an array of apodization masks. The apodization masks have the same apodization function for a predetermined group of modulator cells, by means of which function a complex amplitude transparency can be set for the modulator cells. This transparency corresponds to an individually predefined course of intensity in a far field of the light modulator, wherein the predefined course of intensity includes a reducing of the light intensity of higher magnitudes of diffractions, and/or of the interfering light emitted by the light modulator.04-28-2011
20100214634Holographic Reconstruction System with an Optical Wave Tracking Means - A holographic reconstruction system is disclosed with spatial light modulation means, modulating interferable light waves from light sources with at least one video hologram, comprising optical focusing means, focusing the modulated light waves with the reconstructed object light points for at least one eye position for the eyes of observers and controllable electro-optical deflector means, which direct the focused modulated light waves with the reconstructed light points to at least one eye position in order to reduce the aberrations. The reconstruction system has the optical focusing means in a field of focusing elements, wherein each focusing element is provided with at least one interferable light source. The electro-optical deflector means lie in the light path of the interferable light waves after the optical focusing mean and have at least one field of deflector elements, which has at least one separately controllable electro-optical deflector element for each focusing element.08-26-2010
20080218817SYSTEM AND METHOD FOR MAKING SEAMLESS HOLOGRAMS, OPTICALLY VARIABLE DEVICES AND EMBOSSING SUBSTRATES - Apparatus and method for producing optically variable devices, optically variable media, dot matrix holograms or embossing substrates. The system includes: a laser beam generator, a laser beam shaper, a spatial light modulator, imaging optics and an image positioner. The laser beam generator generates a laser beam, which is shaped by the laser beam shaper to modify the laser beam to an optimized beam profile. The shaped laser beam is modulated by the spatial light modulator, which generates, at a place removed from the substrate surface, an optical pattern. The imaging optics causes the optical pattern to be imaged on the substrate surface. An image positioner allows for the optical pattern to be positioned to different areas of the substrate surface. The system can produce adapted optically variable devices, optically variable media, dot matrix holograms or embossing substrates09-11-2008
20100165430Holographic Reconstruction System and Method with an Enlarged Visibility Region - A holographic reconstruction system and a corresponding holographic reconstruction method are disclosed. The holographic reconstruction system comprises light source means for providing substantially coherent light, reconstruction means for holographically reconstructing a scene and for producing a visibility region from where the viewer can view the holographically reconstructed scene, and deflection means for positioning the visibility region. The aim of the invention is to improve the visibility region of a holographic reconstruction system. To achieve this aim, the holographic reconstruction system comprises deflection drive means for continuously rotating or pivoting the deflection means about a rotational axis at a rotary frequency, thereby displacing the visibility region. The invention allows one or more viewers to view the scene reconstructed by means of the holographic reconstruction system from different positions while facilitating the implementation of the holographic reconstruction system with conventional means.07-01-2010
20100265552Dynamically reconfigurable negative index material crossbars with gain - Various embodiments of the present invention are directed to negative index material crossbars that can be electronically controlled and dynamically reconfigured to exhibit a variety of electromagnetic properties. In one aspect, a negative index material crossbar comprises a first layer of non-crossing nanowires, and a second layer of approximately parallel nanowires that overlay the nanowires in the first layer. Resonant elements at nanowire intersections, and a gain material incorporated in the crossbar such that transmitted electromagnetic radiation with wavelengths in a wavelength band of interest is enhanced when the crossbar is flood pumped with pump electromagnetic radiation.10-21-2010
20100027083COMPACT HOLOGRAPHIC DISPLAY DEVICE - A holographic display device comprises a first OLED array writing onto a first OASLM, the first OLED array and the first OASLM forming adjacent layers, and a second OLED array writing onto a second OASLM, the second OLED array and the second OASLM forming adjacent layers. The first and the second OASLMs encode a hologram and a holographic reconstruction is generated by the device when an array of read beams illuminates the first and second OASLMs and the first and second OASLMs are suitably controlled by the first and second OLED arrays. Advantages include that this device permits independent control of phase and amplitude, and the device lends itself to compactness.02-04-2010
20110019249METHOD FOR ENCODING COMPUTER-GENERATED HOLOGRAMS IN PIXELATED LIGHT MODULATORS - The invention relates to a method for encoding computer-generated holograms in pixelated light modulators, the encoding area of which comprises a pixel matrix whose pixels are provided with a pixel form and a pixel transparency, wherein the encoding area contains a hologram made up of sub-holograms, to each of which is assigned an object point of the object to be reconstructed by the hologram. The corruption of the reconstruction of the hologram caused by the real pixel form and the pixel transparency is largely eliminated and the computing time for correction of the hologram is reduced. Each individual computer-generated sub-hologram is multiplied by a correction function, and only thereafter the corrected sub-holograms are added up to form a total hologram, the correction function being based on the reciprocal of the transform of the pixel function (e.g. 1/sinc) associated with the virtual observer window.01-27-2011
20110032586LIGHT MICROSCOPE WITH NOVEL DIGITAL METHOD TO ACHIEVE SUPER-RESOLUTION - Disclosed are methods and apparatus for reconstructing a wave, including interpolation and extrapolation of the phase and amplitude distributions, with application to imaging apparatus, such as microscopes.02-10-2011
20090185246FABRICATION PROCESS FOR COMPUTER-GENERATED HOLOGRAMS, COMPUTER-GENERATED HOLOGRAM FABRICATED BY THAT PROCESS, AND COMPUTER-GENERATED HOLOGRAM - The invention provides a fabrication process for a computer-generated hologram 07-23-2009
20090207466HOLOGRAPHIC DISPLAY DEVICES - This invention relates to optical systems for holographic projectors. We describe a holographic image projection system, the system including: a spatial light modulator (SLM) for displaying a hologram; first optics to provide an input beam to said SLM; second optics to process an output beam from said SLM to provide a displayed image; and a hologram processor to receive image data for display and to output data to said SLM to display a hologram to provide said displayed image; and wherein at least one lens of said first optics or said second optics is encoded in said hologram.08-20-2009
20110063700SYSTEM, METHOD, AND DEVICE FOR PRODUCING, TRANSMITTING AND DISPLAYING IMAGES IN HOLOGRAPHIC FORM OF UP TO THREE DIMENSIONS - A system, method, and device for producing, transmitting and displaying images in holographic form of up to three dimensions. Information representative of a three dimensional image can be converted into three-dimensional positional data. The three-dimensional position data can be converted into an electromagnetic field which can be received by nanomachines configured to adjust position in accordance with the electromagnetic field and including mirrored endpoints for reflecting light. The nanomachines can adjust position in three dimensions so that the mirrored endpoints reflect light in a manner that reproduces the three dimensional image in holographic form.03-17-2011
20090231649Intraoral Imaging System and Method based on Conoscopic Holography - A conoscopic holographic system and a method for imaging a scene characterized by a surface having a three-dimensional shape. The system utilizes an optical source, which illuminates the scene with substantially linear distributions of light, and independent register of a plurality of elementary conoscopic holograms in the image plane. Each elementary conoscopic hologram represents the imaging of a single emitting point of the illuminated scene. The optical source is translated relative to the scene to generate a sequence of optical holograms, and a weighted reconstruction of the holograms is performed, in a computer process, at a median plane to devise the three-dimensional shape of the imaged scene.09-17-2009
20120044551OPTICAL ELEMENT AND METHOD FOR MANUFACTURING THE SAME - Hologram recording medium is manufactured by using computer. On a recording plane 02-23-2012
20120002256Laser Based Image Display System - We describe optical techniques for replicating an image to expand the exit pupil of a head-up laser-based image display system. The system includes image replication optics to replicate an image carried by a substantially collimated beam, the image replication optics comprising a pair of substantially planar reflecting optical surfaces defining substantially parallel planes spaced apart in a direction perpendicular to the parallel planes. The system is configured to launch the collimated beam into a region between the parallel planes such that the reflecting optical surfaces waveguide the beam between the surfaces in a plurality of successive reflections at front and rear optical surfaces. The front optical surface is configured to transmit a proportion of the collimated beam when reflecting the beam such that at each reflection of the collimated beam at the front optical surface a replica of the image is output from the image replication optics.01-05-2012
20120008181Holographic Image Display Systems - We describe a method of determining an aberration correction for a holographic image display system using a spatial light modulator (SLM) to display a hologram. Embodiments of the invention measure the corrections needed for a particular projection system, using the same system SLM as used to generate the images to provide wavefront-sensing holograms. The projector's projection optics are used to provide the wavefront sensor and there is no need for lenslets. Embodiments of the invention use a plurality of successive holograms directing light from differently-located patches on the hologram into the image.01-12-2012
20120057213Volumetric Imaging of a Holographic Optical Traps - A method and system for manipulating object using a three dimensional optical trap configuration. By use of selected hologram on optical strap can be configured as a preselected three dimensional configuration for a variety of complex uses. The system can include various optical train components, such as partially transmissive mirrors and Keplerian telescope components to provide advantageously three dimensional optical traps.03-08-2012
20120206780METHOD AND DEVICE FOR MANUFACTURING A HOLOGRAM RECORDING MEDIUM - A method and device for manufacturing a hologram recording medium. Arrangements are made to enable different original images to be reproduced upon observation from different positions and yet enable reproduced images of high resolution to be obtained.08-16-2012
20120154880OPTICAL MODULATORS - Various embodiments of the present invention are directed to external, electronically controllable modulators. In one embodiment, a modulating device (06-21-2012
20100067075Method for Rendering and Generating Computer-Generated Video Holograms in Real-Time - Method for real-time rendering and generating of computer-generated video holograms from three-dimensional image data with depth information, where the position and viewing direction of an observer defines a view of the scene, and where the observer is assigned with at least one virtual observer window, which is situated in an observer plane near the observer eyes, comprising the following process steps: 3D rendering and generation of the depth map of scene section data between two parallel section planes, which are disposed at right angles to the viewing direction of the observer, transformation of the scene section data, repetition of the steps of 3D rendering and transformation, Back-transformation, encoding in pixel values in order to reconstruct the three-dimensional scene.03-18-2010
20100165429OPTICAL SYSTEMS - A holographic head up display (HUD) for a vehicle to display an image holographically on a curved display surface such as a windshield is disclosed. The HUD can include a spatial light modulator (SLM) to display a hologram, an illumination system to illuminate said displayed hologram, projection optics to project light from said hologram onto said display surface to form said image, and a processor configured to process said image data to generate hologram data for display on the SLM to form said image. The HUD can further include a non-volatile data memory coupled to said processor to store wavefront correction data for said display surface, and the processor can be configured to apply a wavefront correction responsive to said stored wavefront correction data when generating the hologram data to correct the image for aberration due to a shape of said display surface.07-01-2010
20120300274FLOATING VIRTUAL HOLOGRAM DISPLAY APPARATUS - A floating virtual hologram display apparatus, includes a scanning mechanism, a diffractive optical element and a reconstruction light source thereof. After a light beam emitted from the reconstruction light source passes through the diffractive optical element (DOE), and is diffracted by the DOE, a hologram beam spot will be displayed in front of the diffractive optical element; a floating virtual hologram is displayed after a position of the hologram beam spot is scanned and altered by the scanning mechanism; the floating virtual hologram being allowed to display a variable virtual image by controlling the reconstruction light source to emit bright, dark and different color of light corresponding to an image through the image signal processing unit.11-29-2012
20120162732DEVICE AND METHOD FOR A HOLOGRAPHIC DISPLAY WITH ELECTROMECHANICAL ACTUATED MIRROR DISPLAY - The present disclosure provides systems, methods and apparatus for producing holographic displays using an electromechanical systems device. In one aspect, the method can be implemented to allow for simultaneous modulation of phase and amplitude of light in a display device composed of a plurality of pixels. A light source can provide sufficiently coherent light to a light guide, which can direct the light to a plurality of reflective members. The reflective members can reflect the light to a pinhole-lenslet array. The combination of the pinhole-lenslet array and the reflective members can act as a spatial light modulator, modulating the phase and amplitude of the light reflected by the reflective members. The lenslet can focus the light to a plane at the opening of the pinhole, wherein the light can exit the pinhole to be viewed in combination with light from additional pixels, and can be viewed as a holographic image.06-28-2012
20120162733METHOD FOR CONTROLLING DEPTH-OF-FOCUS IN 3D IMAGE RECONSTRUCTIONS, IN PARTICULAR FOR SYNTHESIZING THREE-DIMENSIONAL DYNAMIC SCENE FOR THREE-DIMENSIONAL HOLOGRAPHY DISPLAY, AND HOLOGRAPHIC APPARATUS UTILIZING SUCH A METHOD - The invention concerns a method for controlling depth-of-focus in 3D image reconstructions, in particular for: 06-28-2012
20120127549WAVELENGTH CONVERSION LASER SYSTEM - The present invention relates to a wavelength conversion laser system and provides a wavelength conversion laser system including a semiconductor optical amplifier, an optical condenser that condenses light emitted from the optical amplifier, a diffraction grating plate that induces wavelength components of the light having passed through the optical condenser in different directions, and an optical very large scale integration (VLSI) processor.05-24-2012
20120170089MOBILE TERMINAL AND HOLOGRAM CONTROLLING METHOD THEREOF - Disclosed are a mobile terminal and a hologram controlling method thereof. Texts, moving images, contents, and so forth may be displayed as a hologram image, and the displayed hologram image may be variously controlled according to a user's touch. This may solve spatial limitations of a general mobile terminal, and may implement a holographic video call more effectively.07-05-2012
20100079831Holographic Projection Device for Magnifying a Visibility Region - A holographic projection apparatus and a method is disclosed for magnifying a virtual visibility region, for observing a reconstructed scene with at least one light modulation device and with at least one light source having sufficiently coherent light for generating a wavefront of a scene that is coded in the light modulation device. By means of imaging the wavefront into a viewer plane, it is possible to generate the virtual visibility region for observing the reconstructed scene. The virtual visibility region has at least two virtual viewer windows. In this case, the virtual viewer windows are dimensioned such that the reconstructed scene can always be observed without tracking of the viewer windows upon movement of a viewer in the viewer plane.04-01-2010
20100271678COMPUTER GENERATED HOLOGRAM - A three dimensional display apparatus includes a diffraction panel for displaying a computer generated hologram and a look-up table. The look-up table includes a plurality of phase entries corresponding to a plurality of image points within a three dimensional image replay volume of the computer generated hologram. The apparatus further includes one or more processors configured to notionally divide the computer generated hologram into one or more hogels and to calculate diffraction fringe information for at least one of the hogels based on a selection of the phase entries.10-28-2010
20100271677IMAGE TRANSFER APPARATUS - An apparatus includes a light source configured to provide a path of light and a spatial light modulator located in the path of light and configured to modulate the light source. Relay optics are configured to receive the modulated light from the spatial light modulator and to project a computer generated image to a nominal image plane. The light source is configured to illuminate the spatial light modulator with collimated light.10-28-2010
20100271676Projection Device for the Holographic Reconstruction of Scenes - The present invention relates to a projection device for holographic reconstruction of scenes, said device comprising at least one light modulator device and at least one light source which emits sufficiently coherent light for the generation of a wave front of a scene, which is encoded in the light modulator device. A Fourier transform (FT) of the light which is emitted by the light source and modulated by the light modulator device is projected by a projection means on to a screen. Further, the wave front which is encoded on the light modulator device is projected by the projection means into at least one virtual observer window in an observer plane. For tracking the observer window according to a change in an eye position of the at least one observer, the inventive device comprises at least one deflection means, which is disposed between the light modulator device and the screen.10-28-2010
20100271675METHOD FOR ENCODING A COMPUTER-GENERATED HOLOGRAM - The object of the invention is to improve the quality of encoding a CGH of a three-dimensional object on a light modulator with the help of an iterative method with phase encoding and thus to improve the reconstruction quality. Based on given object data sets, a two-dimensional distribution of N complex values of a wave field in a virtual observer window (10-28-2010
20090073521Holographic Method With Numerical Reconstruction for Obtaining an Image of a Three-Dimensional Object Which Even Points out of the Depth of Field Are in Focus, and Holographic Apparatus Using Such a Method - The invention concerns a holographic method with numerical reconstruction for obtaining an image of a three-dimensional object, said method employing a digitalised hologram of an object, and comprising a step A. wherein, starting from the digitalised hologram, extracting a phase image of said object corresponding to a bidimensional matrix MD of distance values; a step B. wherein a mono-dimensional subassembly SD of the distance value assembly present in matrix MD of the method step A is selected, subassembly SD containing distance values dk; a step C. wherein for each distance value dk, extracting from matrix MD a iso-level assembly IQdk corresponding to a mono-dimensional assembly of bidimensional coordinates of said object, a step D. wherein for each distance value dk, reconstructing, starting from the digitalised hologram, a bidimensional matrix IMdk of intensity values relevant to said object; a step E. wherein, from each bidimensional matrix IMdk a bidimensional matrix IFdk of intensity values is extracted corresponding to the bidimensional coordinates of the iso-level assembly IQdk; a step F. wherein, starting from intensity values IFdk from the bidimensional coordinates of the iso-level assembly IQdk and from the relevant distance values dk, reconstructing the three-dimensional intensity image of said object, and wherein the resolution of the bidimensional matrix IMdk for all values of k is identical to the resolution of matrix MD of distance values.03-19-2009
20110109948HOLOGRAPHIC IMAGE DISPLAY SYSTEMS - This invention relates to methods, apparatus, and computer program code for the holographic display of images. We describe a method of displaying an image holographically. The method includes displaying a hologram on pixels of a spatial light modulator (SLM) and illuminating the SLM such that the image is displayed in pixels of a replay field (RPF) of the hologram. The method further includes subdividing the replay field into a plurality of spatially interlaced regions, and displaying holograms for each of the interlaced regions of the replay field sequentially at different times such that in an observer's eye the interlaced regions integrate to give the impression of the image and such that interference between adjacent pixels of the replay field is reduced.05-12-2011
20110122467LIGHT MODULATING DEVICE - A light modulating device comprises a spatial light modulator and a homogenizing element. A group of at least two adjacent pixels of the spatial light modulator form a macropixel: The spatial light modulator is of a type such that its pixels comprise a variable content. Each macropixel is used to represent a numerical value which is manifested physically by the states of the pixels of the spatial light modulator which form the macropixel. For each macropixel a homogenizing element is present in the optical path after the macropixel. The homogenizing element comprises an optical input and an optical output. The homogenizing element is adapted such that output light of the macropixel is entering the optical input of the homogenizing element and is mixed within the homogenizing element and is output at the optical output of the homogenizing element.05-26-2011
20100142016HOLOGRAPHIC IMAGE PROJECTION SYSTEMS - We describe a holographic image projection system for projecting an image at an acute angle onto a surface, the system including: a spatial light modulator (SLM) to display a hologram; an illumination system to illuminate said displayed hologram; projection optics to project light from said illuminated displayed hologram onto said surface at an acute angle form said image; and a processor having an input to receive input image data for display and an output to provide hologram data for said SLM, wherein said processor is configured to: input image data and convert this to target image data; generate from said target image data hologram data for display as a hologram on the SLM to reproduce a target image; and wherein said target image is distorted to compensate for said projection of said hologram at an acute angle to form said image.06-10-2010
20100188719Holographic Reconstruction Device - A holographic reconstruction device is designed such that visible resolution of the reconstruction of a scene is matched to the resolution capability of the human eye, to the imaging properties of the reconstruction means used or to the resolution capability of the light modulation means used. A grid scale for the object points is generated by system control means in each case in a plane of intersection, which grid scale cannot be used to separately resolve adjacent object points in the plane of intersection, and the compilation of object points of the respective plane of intersection to form an object point group with adjacent object points which can be separately resolved is carried out. In holographic displays, the invention is used to reduce speckle patterns and reduce the number of the holograms of object points of the scene, which are to be calculated and coded, and the calculation complexity.07-29-2010
20100231999Dynamic Wavefront Shaping Unit - An optical unit for dynamically shaping a wavefront is disclosed, having light modulation cells disposed regularly in cell fields, and locally influencing partial light waves in a propagating light wavefront. Each cell field is connected to a cell controller separately adjusting the optical behavior of the light modulator cells. Serially-disposed fields, each having modulator cells, are located in the light path of the light wavefront. Cell control means adjust the modulator cells in a first cell field such that the modulator cells discretely implement a phase shift having a continuous phase value, and in a second cell field such that the modulator cells implement a prism function having a continuous directional value for the partial light waves. A focusing means for the emitted wavefront is also located in the light path of the optical unit, guiding the partial light waves at an output pupil of the optical unit.09-16-2010
20120327490SYSTEM, METHOD AND APPARATUS FOR PHASE-CODED MULTI-PLANE MICROSCOPY - A volume holographic imaging system enables the projection of a two-dimensional (2D) slice of a four-dimensional (4D) object. The 4D source object is illuminated to emit or scatter an optical field. A holographic element having one or more recorded holograms receives and diffracts the optical field into a diffracted plane beam. A phase mask is encoded in one or more multiplexed holographic gratings of the holographic element using a spatial filter. A collector lens focuses the diffracted plane beam to a 2D slice of the 4D probing source object. The focused 2D slice is projected onto a 2D imaging plane. The holographic element may have multiple multiplexed holograms that are arranged to diffract light from a corresponding slice of the 4D probing source object to a non-overlapping region of the detector.12-27-2012
20120287490Displaying 3D Imaging Sensor Data on a Hogel Light Modulator - Methods and systems for displaying 3D imaging data, including providing 3D imaging sensor data, processing the 3D imaging sensor data, the processing being configured to modify the 3D imaging sensor data into a modified format suitable for a hogel light modulator, and providing the modified 3D imaging data to the hogel light modulator.11-15-2012
20120140300DISPLAY SYSTEMS INCORPORATING FOURIER OPTICS - A head up display signal processing system is disclosed. The system comprises an image projector for projecting an image onto a screen, the screen being partially reflective and partially transmissive. The system is operable to provide a separate optical element at a plurality of locations upon the screen, wherein each element comprises an optical phase representative of the location of the element upon the screen, such that the combination of optical elements is arranged to produce an optical hologram upon the screen.06-07-2012
20120140299HOLOGRAPHIC IMAGE DISPLAY SYSTEM - This invention relates to holographic image display systems, and to related methods and processor control code. We describe a method of displaying an image holographically, the method including: inputting display image data defining said image for display; processing said image data to determine first image data representing a first spatial frequency portion of said image data and second image data representing a second spatial frequency portion of said image data, wherein said second spatial frequency is higher than said first spatial frequency; displaying a hologram of said first image data on a spatial light modulator (SLM) to form a holographically-generated intermediate real image; modulating said intermediate real image using said second image data to display said image.06-07-2012
20130016409METHOD FOR PROVIDING DYNAMIC OPTICAL ILLUSTION IMAGESAANM Kurtz; Andrew F.AACI MacedonAAST NYAACO USAAGP Kurtz; Andrew F. Macedon NY USAANM Kane; Paul JamesAACI RochesterAAST NYAACO USAAGP Kane; Paul James Rochester NY US - A method for providing a printed optical illusion image having first and second illusion states, comprising: receiving a specification of an optical illusion image having one or more mutable portions; and printing the optical illusion image on a printing device using a plurality of colorants, wherein one or more of the colorants are appearance mutable colorants having spectral characteristics can be switched between a first colorant state and a second colorant state by application of an appropriate external stimulus. The printed optical illusion image can be switched between the first and second illusion states by applying the appropriate external stimulus to controllably switch the one or more appearance mutable colorants between their first and second colorant states, thereby switching the mutable portions of the printed optical illusion image between corresponding first and second appearance states.01-17-2013
20110157667Holographic Image Display Systems - The invention relates to holographic head-up displays, to holographic optical sights, and also to 3D holographic image displays. We describe a holographic head-up display and a holographic optical sight, for displaying, in an eye box of the display/sight, a virtual image comprising one or more substantially two-dimensional images, the head-up display comprising: a laser light source; a spatial light modulator (SLM) to display a hologram of the two-dimensional images; illumination optics in an optical path between said laser light source and said SLM to illuminate said SLM; and imaging optics to image a plane of said SLM comprising said hologram into an SLM image plane in said eye box such that the lens of the eye of an observer of said head-up display performs a space-frequency transform of said hologram on said SLM to generate an image within said observer's eye corresponding to the two-dimensional images.06-30-2011
20080225359Computer Hologram and Creation Method Thereof - An original image (09-18-2008
20130100510METHOD AND APPARATUS FOR FAST GENERATION HOLOGRAM - A method and apparatus for fast generation of a hologram image. The method may include generating a point hologram corresponding to each three-dimensional (3D) point using sub-sampling, generating a hologram pattern using the generated point hologram, and generating a 3D hologram by interpolating the generated hologram pattern.04-25-2013
20130100511DISPLAY DEVICE - A display device (04-25-2013
20130170004BEAM DIVERGENCE AND VARIOUS COLLIMATORS FOR HOLOGRAPHIC OR STEREOSCOPIC DISPLAYS - A holographic display with an illumination device, an enlarging unit and a light modulator. The illumination device includes at least one light source and a light collimation unit, the light collimation unit collimates the light of the at least one light source and generates a light wave field of the light that is emitted by the light source with a specifiable angular spectrum of plane waves, the enlarging unit is disposed downstream of the light collimation unit, seen in the direction of light propagation, where the enlarging unit comprises includes a transmissive volume hologram realising an anamorphic broadening of the light wave field due to a transmissive interaction of the light wave field with the volume hologram, and the light modulator is disposed upstream or downstream of the anamorphic enlarging unit, seen in the direction of light propagation.07-04-2013
20130135702METHOD FOR INTEGRATING A SYNTHETIC HOLOGRAM IN A HALFTONE IMAGE - A method for integrating a synthetic hologram in an image of a scene, including: forming, from a first image of the scene, a first matrix including pixels of two shades according to the gray level of the corresponding pixel of the first image, and a second matrix, image of the gray level difference between the corresponding pixels of the first image and of the first matrix; forming a third matrix based on a second image; forming a fourth matrix having each pixel including a central area with a surface area determined by the corresponding element of the second matrix and off-centered in the pixel according to the corresponding pixel of the third matrix; and performing a lithography of an opaque layer at the surface of a plate according to the pattern defined by the fourth pixel matrix.05-30-2013
20080198428Optical element and method for manufacturing the same - Hologram recording medium is manufactured by using computer. On a recording plane 08-21-2008
20130148179HOLOGRAPHIC DISPLAY - Disclosed are various embodiments of a holographic display device that may reproduce dynamic color holograms and holographic video. A holographic display device includes a processor, a memory, a display screen, and one or more monochromatic light sources. The memory stores a holographic interference pattern that encodes a three-dimensional scene. The display screen is configured by the processor to render the holographic interference pattern. The monochromatic light sources are configured to illuminate the display screen so as to reconstruct a wavefront reflected by the three-dimensional scene.06-13-2013
20120274999SYSTEM, METHOD, AND DEVICE FOR PRODUCING, TRANSMITTING AND DISPLAYING IMAGES IN HOLOGRAPHIC FORM OF UP TO THREE DIMENSIONS - A system, method, and device for producing, transmitting and displaying images in holographic form of up to three dimensions. Information representative of a three dimensional image can be converted into three-dimensional positional data. The three-dimensional position data can be converted into an electromagnetic field which can be received by nanomachines configured to adjust position in accordance with the electromagnetic field and including mirrored endpoints for reflecting light. The nanomachines can adjust position in three dimensions so that the mirrored endpoints reflect light in a manner that reproduces the three dimensional image in holographic form.11-01-2012
20100309534METHOD OF DIGITALLY PROCESSING OPTICAL WAVES IN INTEGRATED PLANAR OPTICAL DEVICES THAT OPERATE ON THE PRINCIPLE OF DIGITAL PLANAR HOLOGRAPHY - A method of digitally processing light waves passing through a planar structure having given functions f12-09-2010
20130120813HOLOGRAPHY - An iterative algorithm for hologram design with multiple output image planes arranged in close proximity to create continuous patterns within an imaging volume is disclosed. These may then be used for photolithography on 3D surfaces, or for generation of holograms for use in consumer devices.05-16-2013
20110304895METHOD OF COMPUTING A HOLOGRAM FOR RECONSTRUCTING AN OBJECT USING A DISPLAY DEVICE - A method of computing a hologram for reconstructing an object using a display device is provided. The display device enables a holographic reconstruction of the object. The display device comprises a light source and an optical system to illuminate a hologram-bearing medium being encodable with the hologram. The method comprises the steps of: (a) computing the hologram by determining the wavefronts at an approximate observer eye position that would be generated by a real version of the object to be reconstructed; and (b) encoding the computed hologram in the hologram-bearing medium.12-15-2011
20110310449METHOD FOR GENERATING 3D VIDEO COMPUTER-GENERATED HOLOGRAM USING LOOK-UP TABLE AND TEMPORAL REDUNDANCY AND APPARATUS THEREOF - A method of computing CGH using look-up table and temporal redundancy and an apparatus thereof are disclosed. The apparatus includes an extracting unit, which extracts a brightness image and a depth image from a target frame of 3D video, a comparing unit, which extracts a change point that is different from a point of the target frame after comparing the brightness image and the depth image of the target frame to a brightness image and a depth image of a previous frame, a hologram computing unit, which computes hologram information by differentiating hologram computing methods using hologram patterns depending on whether a ratio between the number of the change points and the number of the entire frame points is equal to or greater than a predetermined critical value, and a storing unit, which stores the brightness image and the depth image of the target image and the hologram information.12-22-2011
20110310448METHOD FOR CALCULATING COMPUTER GENERATED HOLOGRAM USING LOOK-UP TABLE AND APPARATUS THEREOF - A method of calculating a computer generated hologram (CGH) using a look-up table and an apparatus thereof are disclosed. The method in accordance with an embodiment of the present invention can include calculating one principal fringe pattern for points of a target object that are separated by a same distance from a reference point of a hologram plane, writing the principal fringe pattern in the look-up table in accordance with a distance between the points of the target object and the reference point, calculating computer-generated hologram information by shifting the principal fringe pattern to the points of the target object located on a same plane, and playing back a three-dimensional image by using the computer-generated hologram information.12-22-2011
20110310447METHOD FOR GENERATING 3D VIDEO COMPUTER GENERATED HOLOGRAM USING LOOK-UP TABLE AND SPATIAL REDUNDANCY, AND APPARATUS THEREOF - A method of computing a computer generated hologram (CGH) using a look-up table and spatial redundancy and an apparatus thereof are disclosed. The method in accordance with an embodiment of the present invention can includes computing one principal fringe pattern for each point of a target object that is separated by a same distance from a reference point of a hologram plane, storing the principal fringe pattern in accordance with a distance between each point of the target object and the reference point, computing identity data representing whether each point of an input image and adjacent points are identical to one another, computing an n-point fringe pattern by combining n principal fringe patterns and computing hologram information by matching the n-point fringe pattern to n successive points identified from the identity data. Here, the n is a natural number.12-22-2011
20120019882COMPUTATIONAL HIGHLIGHT HOLOGRAPHY - A technique for fabricating a highlight hologram based on a digital object performs point sampling on the object and represents each sampled point as a geometric patch. A set of geometric patches corresponding to sampled points from the object are fabricated into a substrate. A paraboloid patch may be used for reflective substrates while a hyperboloid may be used for transmissive substrates. To avoid specifying overlapping patches, which are impractical to fabricate, certain of the sample points may be merged. An output set of grooves is saved and may be used to specify fabrication of a highlight hologram on the physical substrate.01-26-2012
20130194644IMAGE DISPLAY SYSTEMS - We describe a holographic image projector, comprising: a laser light source to provide light at a laser wavelength; a first spatial light modulator (SLM) to display a hologram, wherein said first SLM is illuminated by said laser light source; intermediate image optics to provide a first intermediate real image plane at which a real image produced by said hologram displayed on said first SLM is formed; a wavelength-conversion material located at said first intermediate real image plane to convert said laser wavelength to at least a first output wavelength different to said laser wavelength; and second optics to project light from said real image at said output wavelength to provide a displayed image.08-01-2013
20120300273FLOATING VIRTUAL HOLOGRAM DISPLAY APPARATUS - A floating virtual hologram display apparatus, includes a scanning mechanism, a diffractive optical element and a reconstruction light source thereof, where the scanning mechanism is installed with a scanning mirror. After a light beam emitted from the reconstruction light source passes through the diffractive optical element is diffracted by the diffractive optical element onto the scanning mirror, and then reflected by the scanning mirror, a hologram beam spot will be displayed in front of the scanning mirror; a floating virtual hologram is displayed in front of the scanning mirror after a position of the hologram beam spot is scanned and altered by the scanning mirror.11-29-2012
20120086995LIGHT MICROSCOPE WITH NOVEL DIGITAL METHOD TO ACHIEVE SUPER-RESOLUTION - Methods and apparatus for reconstructing a wave, including interpolation and extrapolation of the phase and amplitude distributions, with application to imaging apparatus, such as microscopes.04-12-2012
20120086994APPARATUS AND METHOD FOR HOLOGRAPHY 3-DIMENSIONAL DISPLAY - An apparatus includes a recording light source configured to emit recording beams, an electrically addressable spatial light modulator (EASLM) configured to time sequentially modulate the recording beams emitted from the recording light source according to hologram information corresponding to a 3-dimensional image spatially divided into a plurality of portions, an optically addressable spatial light modulator (OASLM) configured to include a plurality of regions corresponding to the plurality of the divided portions of the 3-dimensional image and images on a region corresponding to the portions using the modulated recording beams to form a hologram, a scanning optical unit configured to reproduce the hologram formed by the recording beams serially modulated by the EASLM on a reduced scale and transmit the hologram to the regions of the OASLM corresponding to the portions, and a reproducing light source configured to produce a surface light and emit the surface light to the OASLM.04-12-2012

Patent applications in class For synthetically generating a hologram