Fourier Transform Holography Patents (Class 359/29)
  • Patent number: 10444504
    Abstract: Configurations are disclosed for a health system to be used in various healthcare applications, e.g., for patient diagnostics, monitoring, and/or therapy. The health system may comprise a light generation module to transmit light or an image to a user, one or more sensors to detect a physiological parameter of the user's body, including their eyes, and processing circuitry to analyze an input received in response to the presented images to determine one or more health conditions or defects.
    Type: Grant
    Filed: September 19, 2016
    Date of Patent: October 15, 2019
    Assignee: Magic Leap, Inc.
    Inventors: Nicole Elizabeth Samec, John Graham Macnamara, Christopher M. Harrises, Brian T. Schowengerdt, Rony Abovitz, Mark Baerenrodt
  • Patent number: 10425598
    Abstract: An imaging system uses a dynamically varying coded mask, such as a spatial light modulator (SLM), to time-encode multiple degrees of freedom of a light field in parallel and a detector and processor to decode the encoded information. The encoded information may be decoded at the pixel level (e.g., with independently modulated counters in each pixel), on a read-out integrated circuit coupled to the detector, or on a circuit external to the detector. For example, the SLM, detector, and processor may create modulation sequences representing a system of linear equations where the variables represent a degree of freedom of the light field that is being sensed. If the number of equations and variables form a fully determined or overdetermined system of linear equations, the system of linear equations' solution can be determined through a matrix inverse. Otherwise, a solution can be determined with compressed sensing reconstruction techniques with the constraint that the signal is sparse in the frequency domain.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: September 24, 2019
    Assignee: Massachusetts Institute of Technology
    Inventors: Joseph Hsuhuan Lin, Michael Kelly, Ralph Hamilton Shepard, III, Brian Tyrrell
  • Patent number: 10380360
    Abstract: One embodiment provides a file sharing system. During operation, the system identifies a data file to be sent to a second device of a second user and generates a plurality of coded fragments from the data file based on a generator matrix of erasure encoding. An individual coded fragment does not include plaintext data. The system generates a plurality of sub-files, each of which comprises one or more coded fragments, of the data file. The system attaches a first sub-file to an electronic communication destined to the second device, uploads a second sub-file to a cloud provider, and embeds a link, which may expire and is protected based on a verification code, associated with the uploaded second sub-file into the electronic communication. The system sends the electronic communication to the second device and the verification code in a text message to a cell phone of the second user.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: August 13, 2019
    Assignee: PhazrlO Inc.
    Inventor: Chi-Kwan J. Cheung
  • Patent number: 10230940
    Abstract: A method for determining the complex amplitude of the electromagnetic field associated with a scene, comprising a) capturing a plurality of images of the scene by means of a photographic camera, the images being focused in planes of focus arranged at different distances, wherein the camera comprises a lens of focal length F and a sensor arranged at a certain distance from the lens in its image space, taking at least one image pair from the plurality of images and determining the accumulated wavefront to the conjugate plane in the object space corresponding to the intermediate plane with respect to the planes of focus of the two images of the pair.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: March 12, 2019
    Assignee: Universidad de La Laguna
    Inventors: José Manuel Rodríguez Ramos, Jonas Phillip Lüke, Juan Manuel Trujillo Sevilla, Juan José Fernández Valdivia
  • Patent number: 10168667
    Abstract: Fast processing of information represented in digital holograms is provided to facilitate generating a hologram for displaying three-dimensional (3-D) holographic images representative of a 3-D object scene on a display device. A holographic generator component (HGC) can receive or generate visual images, comprising depth and parallax information, of a 3-D object scene. A hologram processor component can apply a first non-uniform transform to a visual image to generate a first signal, and can apply a second transform to the first signal to generate a second signal that corresponds to a hologram that represents the 3-D object scene. The hologram can be illuminated with a light beam to facilitate generating a holographic image(s) that can be a reconstructed image that reconstructs the 3-D object scene. A display component can display the holographic image(s) for viewing by an observer.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: January 1, 2019
    Assignee: CITY UNIVERSITY OF HONG KONG
    Inventor: Peter Wai Ming Tsang
  • Patent number: 10135222
    Abstract: A VCSEL package including a VCSEL, a housing, containing the VCSEL, and a diffuser operably attached to the housing and configured to receive an emitted beam of light from the VCSEL and produce a beam of predetermined angular divergence. The housing may be a PLLC package, a ceramic package, or a TO-style package. The diffuser could be a substantially planar diffuser sheet, which in some cases may be comprised of glass or plastic. In some embodiments, the diffuser could be a diffractive optical element or holographic light shaping diffuser. In some embodiments, the diffuser can be designed to produce a beam with an illumination full angle of up to about 90 degrees.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: November 20, 2018
    Assignee: Vixar
    Inventors: William Hogan, Mary Brenner
  • Patent number: 9928410
    Abstract: A recognition method includes receiving an input image; and recognizing a plurality of elements associated with the input image using a single recognizer pre-trained to recognize a plurality of elements simultaneously.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: March 27, 2018
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Byungin Yoo, Namjoon Kim, Changkyo Lee, Chang Kyu Choi, Jaejoon Han
  • Patent number: 9735911
    Abstract: A system and apparatus includes an optical masking unit that is configured for applying a user's mask code. The mask code has a code length of at least equal to a number of users. A light source unit is coupled to the optical masking unit. The light source unit includes a number of coherent lasers. The number of coherent lasers is at least equal to half the number of users. Each of the coherent lasers is configured for operation at a different specific prescribed operating frequency. A modulation unit is configured for applying the user's data to the coherent lasers. An optical combiner unit is operable for combining outputs of the coherent lasers to an optical fiber input.
    Type: Grant
    Filed: December 26, 2016
    Date of Patent: August 15, 2017
    Inventor: Manouher Naraghi
  • Patent number: 9665066
    Abstract: Provided are a spatial light modulator (SLM) and a method of fabricating the same. The complex spatial light modulator includes a thin film transistor (TFT) layer provided on a substrate, an amplitude type SLM and a phase type SLM electrically connected to the TFT layer, and a first polarizer provided on the phase type SLM, wherein the TFT layer includes transistors electrically connected to the amplitude type SLM and the phase type SLM, respectively, and the amplitude type SLM and the phase type SLM are commonly and electrically connected to the TFT layer and driven.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: May 30, 2017
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Yong Hae Kim, Chi-Sun Hwang, Gi Heon Kim, Hojun Ryu, Chunwon Byun, Himchan Oh, Myung Lae Lee, Hye Yong Chu
  • Patent number: 9644953
    Abstract: A method and apparatus for aligning optical components within an optical sensor. A mask with an elongate slot formed therethrough is placed optically between an optical emitter and an optical detector of the sensor. The mask is rotated 180 degrees while the detector output is measured. As the mask is rotated, the output varies. The longitudinal position of the slot that corresponds with the maximum detector output is indicative of the transverse direction that the optical emitter must be moved relative to the optical detector for optimal alignment. A controller may operate a first actuator for translating the optical emitter with respect to the optical detector and a second actuator for rotating the mask, thereby automating the alignment process.
    Type: Grant
    Filed: September 11, 2013
    Date of Patent: May 9, 2017
    Assignee: Halliburton Energy Services, Inc.
    Inventors: David L. Perkins, William Soltmann, Jimmy Anders, Robert Atkinson, Wei Zhang
  • Patent number: 9497436
    Abstract: A 3D image processing method includes providing image data, generating a first visual angle image and a second visual angle image according to the 3D image data, blurring the first visual angle image, enhancing the second visual angle image, and displaying the blurred first visual angle image and the enhanced second visual angle image. The 3D image processing method reduces a ghost effect when watching 3D images.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: November 15, 2016
    Assignee: AU OPTRONICS CORP.
    Inventors: Ching-Ming Wei, Hsing-Chuan Yu, Yu-Chieh Chen
  • Patent number: 9354606
    Abstract: Methodologies and systems for generating data that can be used to provide 3-D imaging for one or more viewers are described. In some implementations, images and depth information are obtained from objects. Processing systems are disclosed for producing from these images and depth information data that can be used by projectors to project images that appear in 3-D.
    Type: Grant
    Filed: July 29, 2013
    Date of Patent: May 31, 2016
    Assignee: Integrity Applications Incorporated
    Inventor: James A. Georges, III
  • Patent number: 9291998
    Abstract: Methods and devices for holographic imaging are disclosed. In some embodiments, a holographic imaging device is disclosed that includes at least one radiation source, a reflective surface, and an image sensor. The at least one radiation source may be configured to emit a radiation wave towards the reflective surface and an object positioned on or near the reflective surface, where the radiation wave is reflected by the reflective surface to produce a reference wave and is reflected directly toward the image sensor by the object to produce an object wave directed at the image sensor. Further, the image sensor may be configured to determine an interference pattern between the reference wave and the object wave. A holographic image representing the object may be reconstructed based on the interference pattern.
    Type: Grant
    Filed: April 24, 2013
    Date of Patent: March 22, 2016
    Assignee: IMEC
    Inventors: Roeland Huys, Richard Stahl, Geert Vanmeerbeeck, Peter Peumans
  • Patent number: 9256204
    Abstract: A holographic imaging device for imaging an object under study includes a partially reflective surface having a contact side for contacting the object under study and an imaging side for partially reflecting a radiation wave. The device also includes at least one radiation source for projecting the radiation wave onto the imaging side of the partially reflective surface and an image sensor arranged to receive the radiation wave when reflected by the partially reflective surface. The image sensor is adapted for determining an interference pattern between the radiation wave reflected by the imaging side of the partially reflective surface and the radiation wave reflected by the object under study when contacting the contact side of the partially reflective surface.
    Type: Grant
    Filed: April 24, 2013
    Date of Patent: February 9, 2016
    Assignee: IMEC
    Inventors: Roeland Huys, Richard Stahl, Geert Vanmeerbeeck, Peter Peumans
  • Patent number: 9208533
    Abstract: The invention relates to a synthetic hologram (64A) comprising first elementary cells wherein first openings are respectively defined, said hologram being integrated into a first portion of a binary motif (60), said binary motif comprising at least one second portion wherein second elementary cells comprising second openings (66) are defined, said second openings having an average size equal to the average size of the first openings, with a 5% margin, and a random phase shift.
    Type: Grant
    Filed: September 8, 2011
    Date of Patent: December 8, 2015
    Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
    Inventor: Christophe Martinez
  • Patent number: 8941904
    Abstract: A main object of the present invention is to provide a hologram observation sheet with a transmission type hologram formed integrally with other members, to be attached with various members for the use as for example an advertising medium or a decoration member. To achieve the object, the invention provides a hologram sheet comprising: a transparent substrate, a hologram layer formed on the transparent substrate and having a transmission type Fourier transform hologram region having the function of transforming a light beam incident from a point light source to a desired optical image, and a pressure-sensitive adhesive layer.
    Type: Grant
    Filed: June 29, 2006
    Date of Patent: January 27, 2015
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Koji Eto, Yasuyuki Oyagi, Mitsuru Kitamura, Masachika Watanabe
  • Patent number: 8917431
    Abstract: A color filter with parallel, vertical color strips of the RGB base colors associated with the image separating element, the color strips repeating horizontally within the color filter in periodic fashion. The light modulator contains a sequence of two registered holograms for each base color interlaced into six pixel columns for a left observer eye and for a right observer eye, and the sequence is repeated horizontally in periodic fashion. The periods of the color filter and the hologram are arranged relative to one another with the same degree of expansion, with a color strip and at least two pixel columns with holograms of the base color of the color strip are associated with a separating element.
    Type: Grant
    Filed: November 10, 2009
    Date of Patent: December 23, 2014
    Assignee: Seereal Technologies S.A.
    Inventor: Ralf Haussler
  • Publication number: 20140240807
    Abstract: The present invention provides a digital hologram recording system and a numerical reconstruction method for a hologram, which are used for capturing an image of an object and recording it as a holographic data. Said system comprises: signal light, formed after irradiating the object with a light source; an image detector, for recording interference fringes of the signal light; and a light pipe, arranged in a path of the signal light and located between the object and the image detector, wherein the light pipe has a reflection surface, and a part of the signal light enters the image detector after reflected by the reflection surface of the light pipe. The present invention can make the collected signal equivalent to several times of the pixel counts of the image detector, thereby able to break through the spatial bandwidth limitation and shortening the amount of time required to measure the hologram.
    Type: Application
    Filed: January 13, 2014
    Publication date: August 28, 2014
    Applicant: NATIONAL CENTRAL UNIVERSITY
    Inventors: Yeh-Wei YU, Ching-Cherng SUN
  • Patent number: 8712185
    Abstract: Methods for numerically generating a centered discrete fractional Fourier transform matrix on a computer, the centered discrete fractional Fourier transform matrix of size N by N where N is an odd integer. Centering is obtained by simple barrel roll operations on eigenvectors. High-accuracy is obtained by numerically calculating the eigenvectors of the discrete fractional Fourier transform matrix from a closed-form mathematical formula and then iteratively performing a Gram-Schmidt orthogonalization procedure until a resulting set of improved-orthogonal eigenvectors is produced that is sufficiently orthogonal.
    Type: Grant
    Filed: August 5, 2013
    Date of Patent: April 29, 2014
    Inventor: Lester F. Ludwig
  • Patent number: 8659810
    Abstract: A method and apparatus for preparing a digital hologram representing an image of an object includes generating a measurement beam and a first reference beam, irradiating the object by the measurement beam, and guiding the measurement beam reflected to an optical sensor. The method also includes guiding the first reference beam to a first mirror, and guiding the reflected beam to the optical sensor so that both beams generate an interference pattern on the sensor. The method includes providing a digital signal representing the interference pattern on the optical sensor, to obtain a digital hologram, and subjecting the digital hologram to a Fourier transform in the spatial frequency domain to obtain a spectrum. The method further includes replacing a section of a first image term overlapped by a DC-term by a corresponding section of a second image term.
    Type: Grant
    Filed: December 30, 2011
    Date of Patent: February 25, 2014
    Assignee: Mitutoyo Corporation
    Inventor: Ki-Nam Joo
  • Patent number: 8593710
    Abstract: A holographic projection device comprises for the reconstruction of scenes at least one light source which emits sufficiently coherent light for the generation of a wave front. Further, the projection device comprises at least one light modulator device containing modulation element, said projection device being of a two-dimensional design. The light modulator device and a scanning element are combined such that the light emitted by the scanning element only scans one one-dimensional arrangement of modulation elements of the two-dimensional light modulator device at a time.
    Type: Grant
    Filed: May 16, 2007
    Date of Patent: November 26, 2013
    Assignee: Seereal Technologies S.A.
    Inventor: Philippe Renaud-Goud
  • Patent number: 8542421
    Abstract: 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.
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: September 24, 2013
    Assignee: Celloptic, Inc.
    Inventors: Joseph Rosen, Gary Brooker
  • Patent number: 8542945
    Abstract: A method for correcting mis-focus of an image created from coherent imaging using centered fractional Fourier transforms or mathematical equivalents is described. A received image is presented to a numerical processor, and a first numerical value for a variable ? is selected and used in an iterative algorithm, numerical procedure, system architecture, etc. A centered discrete fractional Fourier transform of power ? and a phase restore operator associated with a centered discrete fractional Fourier transform of power ? are applied to the image file to produce a modified image. A change in mis-focused is determined and used in adjusting ? for a next iteration. If values for ? between 0 and real number ? do not result in a desired outcome, ? is adjusted as a complex value ?+i? where ? is a real number.
    Type: Grant
    Filed: November 15, 2010
    Date of Patent: September 24, 2013
    Inventor: Lester F. Ludwig
  • Patent number: 8531748
    Abstract: The present invention relates to a lens system for an apparatus for reading from and/or writing to holographic storage media, and more specifically to a lens system optimized for an apparatus with a coaxial common aperture arrangement of an object beam and a reference beam. According to the invention, the lens system, which Fourier transforms an object beam and focuses a reference beam into a hologram layer of a holographic storage medium, and which focuses a servo beam onto a servo area of the hologram layer, includes a moving part acting on the object beam, the reference beam and the servo beam, and a fixed part acting only on the servo beam.
    Type: Grant
    Filed: September 24, 2008
    Date of Patent: September 10, 2013
    Assignee: Thomson Licensing
    Inventors: Gabor Szarvas, Laszlo Domjan
  • Patent number: 8482828
    Abstract: 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 is the other Fourier transformation plane.
    Type: Grant
    Filed: March 3, 2008
    Date of Patent: July 9, 2013
    Assignee: Seereal Technologies S.A.
    Inventor: Norbert Leister
  • Patent number: 8416480
    Abstract: A hologram reproducing apparatus includes a first reference light path leading laser light from a laser light source so that a hologram recording medium is irradiated with first reference light; a diffracted light path leading diffracted light, generated from the hologram recording medium by irradiation with the first reference light, to a light receiving element having a plurality of pixels; and a second reference light path leading second reference light, having the same polarization direction as that of the diffracted light, from the laser light source to the light receiving element. The second reference light path is provided with a phase modulating element so that the phase difference between the diffracted light and the second reference light in a light receiving surface of the light receiving element is adjusted within a predetermined range.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: April 9, 2013
    Assignee: Sony Corporation
    Inventors: Tomiji Tanaka, Masaaki Hara, Kazutatsu Tokuyama, Satoru Seko, Shinji Yamada, Hitoshi Okada
  • Patent number: 8405890
    Abstract: 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 configure 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.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: March 26, 2013
    Assignee: CellOptic, Inc.
    Inventor: Joseph Rosen
  • Patent number: 8398243
    Abstract: 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.
    Type: Grant
    Filed: January 15, 2007
    Date of Patent: March 19, 2013
    Assignee: Seereal Technologies S.A.
    Inventor: Philippe Renaud-Goud
  • Patent number: 8395616
    Abstract: 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.
    Type: Grant
    Filed: April 12, 2007
    Date of Patent: March 12, 2013
    Assignee: SeeReal Technologies S.A.
    Inventor: Alexander Schwerdtner
  • Patent number: 8390676
    Abstract: The invention relates to a method and a playback device for a two- and/or three-dimensional illustration, having at least one light source, at least one light modulation device, a display screen, and a tracking system for tracking a virtual viewer window of a viewer plane, in which at least one viewer is located. This tracking system has a position detection system for determining the eye positions of the at least one viewer in the viewer plane, a tracking device, and a control device for activating and controlling the tracking device, and is disposed between the light modulation device and the display screen. In order to track the viewer window along an optical axis of the playback device, a focal width on the image side of an optical system of the tracking device is constant.
    Type: Grant
    Filed: August 24, 2007
    Date of Patent: March 5, 2013
    Assignee: SeeReal Technologies S.A.
    Inventors: Stanislas Flon, Philippe Renaud-Goud
  • Publication number: 20120274568
    Abstract: A hologram projecting system includes a coherent light source for emitting a reference beam onto a real object; and an image sensor for receiving the reference beam and a scattered beam reflected from the real object, and recording a Fourier image of the real object. Also included is a modulator for receiving the Fourier image. The reference beam is passed through the modulator, and configured to interact with the Fourier image to form a virtual image of the real object. The image sensor includes an n×m pixel array, where n and m are numbers of rows and columns, respectively. The modulator includes an n×m pixel array corresponding to the n×m pixel array of the image sensor. The pixels in the n×m pixel array of the image sensor control transmissivity of light in corresponding pixels of the n×m pixel array of the modulator.
    Type: Application
    Filed: June 16, 2011
    Publication date: November 1, 2012
    Applicant: APTINA IMAGING CORPORATION
    Inventors: Victor Lenchenkov, Dongqing Cao
  • Patent number: 8294694
    Abstract: A three-dimensional image display device is provided which allows a reduction in redundant calculation and high-speed obtainment of an optimum control image to be recorded on an optical wavefront control unit This invention relates to a three-dimensional image display device for displaying a three-dimensional image by irradiating illuminating light at an optical wavefront control unit which records a control image. The three-dimensional image display device of this invention includes a control image optimizing unit which calculates three-dimensional images corresponding to a group of control images based on constraints inherent to the optical wavefront control unit, selects a control image corresponding to a three-dimensional image satisfying a predetermined condition from the group of control images and records the selected control image on the optical wavefront control device.
    Type: Grant
    Filed: February 9, 2005
    Date of Patent: October 23, 2012
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masashi Tsuboi, Tsutomu Horikoshi, Atsushi Takeshita
  • Patent number: 8294749
    Abstract: The invention relates to method, computer program code and signal processing/image display systems for displaying one or more images using holographic techniques. We describe a method of generating data for displaying an image defined by displayed image data using a plurality of holographically generated temporal subframes, the temporal subframes being displayed sequentially in time such that they are perceived as a single noise-reduced image. The method includes generating from the displayed image data holographic data for each subframe of said set of subframes such that successive replay of holograms defined by said holographic data for said subframes gives the appearance of said image, and wherein the method further includes, when generating said holographic data for a said subframe, compensating for noise in said displayed image arising from one or more previous subframes of said sequence of holographically generated subframes.
    Type: Grant
    Filed: September 15, 2006
    Date of Patent: October 23, 2012
    Assignee: Light Blue Optics Ltd.
    Inventor: Adrian Cable
  • Patent number: 8284469
    Abstract: An apparatus for reading a data page from and/or writing a data page to a holographic storage medium includes a common aperture arrangement of one or more reference beams and an object beam or a reconstructed object beam. One or more spatial light modulators are provided for generating the one or more reference beams by modulating a light beam with a modulation pattern having a spatial frequency higher than the spatial frequency of the data page.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: October 9, 2012
    Assignee: Thomson Licensing
    Inventor: Wolfgang Hossfeld
  • Patent number: 8279507
    Abstract: 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 14 is fabricated by applying Fourier transform to a plurality of input image to obtain a plurality of corresponding Fourier transform images 13-1, 13-2 and arraying the Fourier transform images 13-1, 13-2 on the same plane according to a given two-dimensional array principle into a computer-generated hologram. When a plurality of point light sources 231 to 239 located behind the hologram 14 are viewed through the hologram 14, a plurality of images are simultaneously and parallel reconstructed (28) in correspondence to the array positions of the plurality of Fourier transform images.
    Type: Grant
    Filed: November 14, 2009
    Date of Patent: October 2, 2012
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventor: Akiko Tanaka
  • Patent number: 8218212
    Abstract: 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.
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: July 10, 2012
    Assignee: SeeReal Technologies S.A.
    Inventors: Bo Kroll, Norbert Leister
  • Patent number: 8208184
    Abstract: A holographic storage system having an improved data page quality is described. The holographic storage system includes a special optical filter or a special light source for emphasizing the high frequency components of a reference beam and/or an object beam. This is achieved by an optical filter arranged in a Fourier plane, which has a higher attenuation at the center than at the edge. Alternatively, an adapted light source for generating the reference beam and/or the object beam is arranged in a Fourier plane. The light beam emitted by the light source has a higher intensity close to the edge than at the center.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: June 26, 2012
    Assignee: Thomson Licensing
    Inventors: Joachim Knittel, Frank Przygodda
  • Patent number: 8199388
    Abstract: According to one aspect and example, a holographic recording system includes a light source, an object for modulating an object beam from the light source, and a relay system adapted to magnify (positive or negative) the modulated beam (e.g., an image of the object) to an output image. The object may include an SLM operable to modulate the object beam with an information layer comprising a plurality of data pages. The output image is directed to the holographic storage medium, where a reference beam is also directed, to record the resulting interference pattern. Additionally, the relay system converges the output image to an output Fourier plane, which may be disposed within the holographic storage medium. A filter may be placed at an intermediate Fourier plane located prior to the output Fourier plane, and a phase mask may be placed at the position of the output image.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: June 12, 2012
    Assignee: InPhase Technologies, Inc.
    Inventors: Ernest Y. Chuang, Kevin R. Curtis, Jan Hoogland, Yunping Yang
  • Patent number: 8194124
    Abstract: A holographic microscope comprising a source configured to provide a diverging beam of radiation, a beam splitter configured to direct a first portion of the diverging beam towards an object and a second portion of the diverging beam towards a reflector, the beam splitter being further configured to direct an object beam from the object and a reference beam from the reflector towards a transducer, and the transducer being configured to provide a signal indicative of the interference pattern of the object beam and the reference beam incident on the transducer. A method of digital holography is also disclosed.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: June 5, 2012
    Assignee: Nanyang Technological University
    Inventors: Anand Krishna Asundi, Vijay Raj Singh
  • Patent number: 8179578
    Abstract: 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.
    Type: Grant
    Filed: July 18, 2006
    Date of Patent: May 15, 2012
    Assignee: Celloptic, Inc.
    Inventors: Joseph Rosen, Gary Brooker
  • Patent number: 8174744
    Abstract: 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.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: May 8, 2012
    Assignee: SeeReal Technologies GmbH
    Inventor: Armin Schwerdtner
  • Patent number: 8170366
    Abstract: Processing image information includes receiving light having image information. A first optical transform is performed on the light to yield a first optically transformed light, and a second optical transform is performed on the light to yield a second optically transformed light. A first metric is generated in accordance with the first optically transformed light, and a second metric is generated in accordance with the second optically transformed light. The first metric and the second metric are processed to yield a processed metric. An inverse optical transform is performed on the processed metric to process the image information of the light.
    Type: Grant
    Filed: November 3, 2003
    Date of Patent: May 1, 2012
    Assignee: L-3 Communications Corporation
    Inventors: Timothy E. Ostromek, Antonio V. Bacarella
  • Patent number: 8125698
    Abstract: Hologram recording devices and techniques can be employed to produce wide field-of-view holograms. A lens can be used to couple an object beam into a holographic recording material without substantially changing the angle of incidence of the object beam. When displayed, images from holograms recorded using this technique can have a field-of-view greater than that of the object beam. One or more aspheric reflective surfaces can be used to couple an object beam into a holographic recording material at relatively steep angles.
    Type: Grant
    Filed: July 16, 2007
    Date of Patent: February 28, 2012
    Assignee: Zebra Imaging, Inc.
    Inventors: Qiang Huang, Michael A. Klug
  • Publication number: 20120037698
    Abstract: The present invention relates to a novel type of information carrier, on which information is stored in the form of diffraction structures. The information carrier according to the invention can be read by being drawn manually through a reading device. The present invention also relates to a device with which an information carrier according to the invention can be read.
    Type: Application
    Filed: March 9, 2007
    Publication date: February 16, 2012
    Applicant: Bayer Innovation GmbH
    Inventors: Stephan V+e,uml e+ee lkening, Torsten Hupe
  • Patent number: 8081552
    Abstract: A hologram disc reading and writing apparatus including a signal light source module, a beam splitter, a reference/reading light source, a reflector, and an optical reading head and a hologram disc reading apparatus are provided. A signal light beam emitted from the signal light source module is transmitted to a data region of a hologram disc through the beam splitter. The reference/reading light source, the signal light source module, and the optical reading head are disposed at the same side of the hologram disc. The reflector is disposed at the other side. A spherical wave light beam emitted from the reference/reading light source is transmitted through the data region and reflected by the reflector to form a phase conjugate light beam transmitted to and through the data region. The phase conjugate light beam is transformed to a data light beam transmitted to the optical reading head through the beam splitter.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: December 20, 2011
    Assignee: National Central University
    Inventors: Ching-Cherng Sun, Yeh-Wei Yu, Che-Chih Hsu, Tun-Chien Teng, Cheng-Hsien Chen
  • Patent number: 8068263
    Abstract: An apparatus for reading from and/or writing to transmission type holographic storage media is proposed, and more specifically a coaxial type apparatus for reading from and/or writing to transmission type holographic storage media with two or more reference beams, which has an improved Signal to Noise Ratio. The apparatus has a coaxial arrangement of two or more reference beams and an object beam or a reconstructed object beam. The reference beams are arranged on a circle around the object beam or the reconstructed object beam in a Fourier plane of the apparatus behind the holographic storage medium. A mirror is located in or close to this Fourier plane, which is designed such that it reflects the object beam or the reconstructed object beam without reflecting the reference beams.
    Type: Grant
    Filed: April 7, 2009
    Date of Patent: November 29, 2011
    Assignee: Thomson Licensing
    Inventors: Gabor Szarvas, Szabolcs Kautny, Krisztian Banko, Zokan Karpati
  • Patent number: 8064115
    Abstract: A hologram recording/reproducing apparatus includes: a coherent light source; a spatial light modulator which spatially modulates light from the coherent light source; a Fourier transform lens which concentrates light modulated by the spatial light modulator upon a hologram medium; and a two-dimensional light-receiving element array which receives light from the hologram medium. The spatial light modulator is divided into a reference light area and a signal light area, and the divergence angle of reference light emitted from the reference light area is wider than the divergence angle of signal light emitted from the signal light area.
    Type: Grant
    Filed: March 17, 2008
    Date of Patent: November 22, 2011
    Assignee: Panasonic Corporation
    Inventors: Kenichi Kasazumi, Tomoya Sugita
  • Patent number: 8045244
    Abstract: Video image data is converted into spatial frequency information using Fourier transformation. The spatial frequency information is provided to an 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, and 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 a projecting unit.
    Type: Grant
    Filed: December 22, 2008
    Date of Patent: October 25, 2011
    Assignee: Olympus Corporation
    Inventor: Yoshiaki Horikawa
  • Patent number: 8027071
    Abstract: 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.
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: September 27, 2011
    Assignee: SeeReal Technologies GmbH
    Inventor: Armin Schwerdtner
  • Patent number: 7990594
    Abstract: The present invention relates to a phase mask for holographic data storage, and to a method and an apparatus for reading from and/or writing to holographic storage media using such a phase mask. According to the invention, the phase mask has a plurality of phase cells, whose size is equal to an integer multiple of the size of the pixels of a spatial light modulator of the apparatus. The phase cells have a phase variation on sub-cell scale, which is inverse for essentially half the number of phase cells.
    Type: Grant
    Filed: July 10, 2008
    Date of Patent: August 2, 2011
    Assignee: Thomson Licensing
    Inventors: Frank Przygodda, Joachim Knittel