197results about "Digital holography electronic component" patented technology

A display system is provided. The display system comprises a replicator arranged to receive spatially modulated light and replicate the spatially modulated light to form a plurality of replicas of the spatially modulated light by waveguiding between a reflective surface and a transmissive-reflective surface. The transmissive-reflective surface forms an output surface for the plurality of replicas of the spatially modulated light. The display system further comprises a light control device located in the optical path of the plurality of replicas of the spatially modulated light downstream from the output surface of the replicator. The light control device is arranged to provide a first compensation for the curvature of a curved optical component downstream from the light control device. The first compensation is a function of the position on the output surface and is arranged to only partially counteract the curvature of the optical component and retain some distortion from the curvature of the optical component of at least one of the replicas compared to another of the replicas.

A display system comprises a replicator arranged to receive spatially modulated light and replicate the spatially modulated light to form a plurality of replicas of the spatially modulated light by waveguiding between a reflective surface and a transmissive-reflective surface, which forms an output surface for the plurality of replicas of the spatially modulated light. The display system further comprises a light control device located in the optical path of the plurality of replicas of the spatially modulated light downstream from the output surface of the replicator, arranged to provide a first compensation for the curvature of a curved optical component downstream from the light control device. The first compensation is arranged to only partially counteract the curvature of the optical component and retain some distortion from the curvature of the optical component of at least one of the replicas compared to another of the replicas.

Provided are a method and apparatus for optimizing a holographic display. The holographic display back-propagates target field data including generating a predicted hologram by a plurality of planes in a depth direction to a complex plane of a space light modulator (SLM), converts the predicted hologram into a binary hologram, generates predicted field data by forward-propagating the binary hologram to a reproduction plane through an optical system simulation model, calculates a loss function between the predicted field data and the target field data, generates a new predicted hologram for the predicted field data by using a stochastic gradient descent (SGD) method to reduce a value of the loss function, and repeats the generation of the new predicted hologram until the value of the loss function is less than a predefined threshold.

There is provided a pixel transform method for JPEG / MPEG compression of double phase-amplitude coded holograms. According to an embodiment, a hologram compression method transforms a hologram represented by a complex number into a hologram represented only by a phase, rearranges pixels of the transformed hologram, and compresses the rearranged hologram. Pixels of a DPAC hologram are rearranged before the DPAC hologram is compressed in a standardized image / video compression technique, so that a high frequency component is prevented from occurring when a hologram is compressed. Accordingly, hologram quality degradation occurring when a DPAC hologram is used in a standardized image / video compression technique can be prevented.

An objective hologram quality evaluation method is provided. The quality evaluation method, according to an embodiment of the present invention, receives an original holographic fringe pattern and a target holographic fringe pattern to be compared, calculates the respective angular spectra of the inputted original holographic fringe pattern and the inputted target holographic fringe pattern, and calculates a PSNR obtained from the calculated angular spectra as a quality value of the target holographic fringe pattern. Since the angular spectrum of the holographic fringe pattern has the same characteristics without change according to distance, even a diffraction wavefront positioned at an arbitrary distance as well as the position of the holographic fringe pattern has the same PSNR value, thereby enabling objective quality evaluation for the holographic fringe pattern.

A display system is provided. The display system includes a replicator arranged to receive the spatially modulated light and replicate the spatially modulated light to form a plurality of replicas of the spatially modulated light through a waveguide between a reflective surface and a transflective surface. The transflective surface forms an output surface of a plurality of replicas of spatially modulated light. The display system also includes a light control device located downstream of the output surface of the replicator in the optical path of the plurality of replicas of spatially modulated light. The light control device is arranged to provide a first compensation for the curvature of the curved optical component downstream of the light control device. The first compensation is a function of the position on the output surface and is arranged to only partially cancel the curvature of the optical component and preserve some distortions in the curvature of the optical component of at least one replica compared to another replica.

A computing device and method are provided for transmitting a relevant subset of map data, called a neighborhood, to enable mutual spatial understanding by multiple display devices around a target virtual location to display a shared hologram in the same exact location in the physical environment at the same moment in time. The computing device may comprise a processor, a memory operatively coupled to the processor, and an anchor transfer program stored in the memory and executed by the processor.

A particulate matter detection device takes holographic images of flowing particulate matter concentrated by a virtual impactor, which selectively slows down and guides larger particles to fly through an imaging window. The flowing particles are illuminated by a pulsed laser diode, casting their inline holograms on a CMOS image sensor in a lens-free mobile imaging device. The illumination contains three short pulses with a negligible shift of the flowing particle within one pulse and triplicate holograms of the same particle are recorded at a single frame revealing different perspectives of each particle. A deep neural network classifies the particles based on the acquired holographic images. The device was tested using different types of pollen and achieved a blind classification accuracy of 92.91%. This mobile and cost-effective device weighs ˜700 g and can be used for label-free sensing and quantification of various bio-aerosols over extended periods.

A projection system comprising a display device, a hologram engine and a waveguide. The display device is arranged to display a hologram of an image and spatially modulate light in accordance with the hologram to form a holographic wavefront. The hologram engine is arranged to calculate the hologram. The hologram is arranged to angularly distribute light within the holographic wavefront in accordance with spatial position within the image such that continuous angular ranges of the holographic wavefront respectively correspond with continuous regions of the image. The waveguide comprising a pair of parallel reflective surfaces arranged to waveguide the holographic wavefront therebetween. A first surface of the pair of parallel reflective surfaces is partially reflective-transmissive so as to form an output comprising a plurality of emission zones for the holographic wavefront. The hologram engine is arranged to modify the hologram to at least partially compensate for a decrease in intensity of the emission from each successive emission zone of the waveguide caused by the partial reflection-transmissions at the first surface during waveguiding.

A head-up display having a glare trap and an eye-box is described. The head-up display comprises a picture generating unit, an optical system, an infrared image capture device and a plurality of infrared light sources. The optical system comprises at least one mirror, a cover glass and a beam splitter that is substantially reflective to infrared light and transmissive to visible light. The infrared image capture device is disposed within the volume of the optical system. The plurality of infrared light sources are packaged with the glare trap and are arranged to illuminate the eye-box.

In some implementations, a method comprises; determining a set of characteristics of light spectra reflected or transmitted by a set of materials when the set of materials is illuminated by a plurality of light wavelengths; constructing one or more classifiers configured to classify each material of the set of materials based on the set of characteristics of the light spectra; using the classifiers, mapping each of the light spectra onto an area of an image sensor; wherein one or more optical elements filter and focus the light spectra onto one or more elements of a detector array; wherein each optical element focuses onto an area of the detector array; wherein the mapping is a 1:1 mapping; wherein each optical element uses a Bragg reflection condition to filter the light spectra and to focus the light spectra onto an element of the detector array.

An apparatus for visualizing an interaction of a physical object with a 3-D image includes a display device, a first projection device, an acquisition device, and an evaluation device. The display device presents the 3-D image which is perceivable by a user. The first projection device projects a first optical display onto a first region of the physical object. The acquisition device captures first object data of the display device and second object data of the physical object that is spaced apart from the display device and movable. The acquisition device determines a distance between a reference position formed on a surface of the display device and the physical object using the first object data and the second object data. The evaluation device is signal-connected to the acquisition device and the first projection device, and triggers the projection of the first optical display by the first projection device responsive to a condition in which the determined distance is less than a minimum distance defined in advance.

A method comprising: receiving a first signal indicating a first viewing position of a user within a viewing space of a head-up display; determining a first intensity for a first target image based on a distance between the first viewing position and a predetermined reference viewing position within the viewing space; and illuminating a first hologram corresponding to the first target image to holographically reconstruct the first target image at the first intensity; then, receiving a second signal indicating a second viewing position of the user within the viewing space, wherein the second viewing position is different to the first viewing position; and determining a second intensity for a second target image based on a distance between the second viewing position and the predetermined reference viewing position within the viewing space; illuminating a second hologram corresponding to the second target image to reconstruct the second target image at the second intensity; wherein the second intensity is different to the first intensity, and a difference between the first intensity and the second intensity indicates whether the second viewing position is closer to the predetermined reference viewing position or further from the predetermined reference viewing position compared to the first viewing position.

The invention relates to a method for characterizing microorganisms present in a biological sample, said method comprising acquiring a real-time holographic digital image of the sample, generating a focused image by using a digital model for reconstructing the focused image, and characterizing bacteria based on the focused image. According to the invention, a plurality of calibration objects are provided in the acquisition field of view prior to acquisition of the holographic image, these objects having pre-characterized dimensions and refractive indexes and selected shapes, such that the interference pattern of the objects can be calculated using an image forming model for integrating the optical aberrations of the acquisition device. The optical aberration is limited according to the interference pattern of the object and the calculated interference pattern before the computer generates the focused image, and a digital model used to reconstruct the focused image integrates the quantized optical aberration.

There is provided a method of projection using an optical element having spatially variant optical power. The method comprises combining Fourier domain data representative of a 2D image with Fourier domain data having a first lensing effect to produce first holographic data. Light is spatially modulated with the first holographic data to form a first spatially modulated light beam. The first spatially modulated light beam is redirected using the optical element by illuminating a first region of the optical element with the first spatially modulated beam. The first lensing effect compensates for the optical power of the optical element in the first region.

The invention relates to a system for a functionalized door pane through which person- and / or object-related authorization control can be performed. For person-related control, a holographically based, stereoscopic Holocam, which can be integrated into the pane, can be included. Furthermore, a holographic display, which can also be integrated into the pane, can be included. By appropriate methods, the authorization control can be performed, and a door locking mechanism and a holographic display can be controlled by the control device.

A holographic display system includes an eye tracker configured to determine a position of a feature of an eye, a light source configured to output image light, and a digital dynamic hologram. The digital dynamic hologram is configured to receive the image light from the light source. The digital dynamic hologram is further configured to spatially modulate the image light based on a target image to form a reconstructed image in the eye. The reconstructed image includes noise that is non-uniformly distributed across the reconstructed image based on the position of the feature of the eye.

A volumetric display system including a volumetric display for displaying a scene viewable as a three-dimensional floating-in-the-air scene in a display space, enabling a user to reach a first object into the display space, a location determination unit locating real objects in the display space, providing a location of the first object when the first object is inserted into the display space, and a computer for receiving the location of the first object, detecting when the location of the first object is at a location where an object is displayed in the three-dimensional scene, thereby determining that the first object is viewable as touching the displayed object following a detection of the first object viewable as touching the displayed object, producing a new three-dimensional scene displaying the displayed object as if manipulated by the first object. Related apparatus and methods are also described.

An image reproduction device 6 reproduces an image including N different parameters of a wavelength range or the like, and comprises: a multiplexed hologram acquisition unit 61 for acquiring N to 2N multiplexed holograms obtained by multiplex-recording interference patterns for each parameter; a parameter selection unit 63 for selecting the parameters one by one; a hologram generation unit 64 for generating a calculation hologram including two light waves having the selected parameters from the multiplexed holograms; and a light wave restoration unit 65 for restoring one of the two light waves from the calculation hologram.

There is provided a hologram quality assessment method. The quality assessment method according to an embodiment may receive an input of an original holographic fringe pattern and a target holographic fringe pattern which is a comparison target, may calculate angular spectra of the inputted original holographic fringe pattern and target holographic fringe pattern, respectively, and may calculate a PSNR as a quality value of the target holographic fringe pattern from the calculated angular spectra. Since the angular spectrum of the holographic fringe pattern has the same characteristic without a change according to a distance, not only a diffraction wavefront that is positioned at a position of the holographic fringe pattern but also a diffraction wavefront positioned at a certain distance may have the same PSNR value. Accordingly, objective quality assessment for a holographic fringe pattern is possible.

A method and apparatus for controlling lightfield and / or holographic media to be streamed to a client, determining a bandwidth based on a status of a client buffer, splitting the scene of the lightfield and / or holographic media, determining whether the assets are present in the client buffer, mapping the assets to respective ones of the split scenes and to the client buffer, controlling a transmission assets to the client buffer based on the bandwidth, the mapping, and whether one or more of the assets are determined to be present in the client buffer, and controlling the client to reuse at least one of the assets when rendering at least one of the split scenes.

A holographic projector having an illumination system to illuminate a displayed hologram on a pixel area of a spatial light modulator (SLM) 140 to form a holographic wavefront. The projector comprises

An apparatus and method are introduced to produce a hologram of an object from electromagnetic radiation, such as incoherent light, received from the object. The electromagnetic radiation is received by a receiving assembly and transformed into a plurality of co-linear co-propagating beams with different focal distances. The interference of the plurality of beams is enabled by projecting components of each beam along a common polarization direction. The interference patterns thus formed are recorded and then processed to form the hologram of the object.

A holographic display method and a holographic display system are provided. The holographic display method includes: obtaining target scene information; recognizing human face area information of the target scene information; confirming a pupil position of the human face area information; calculating a lateral viewing angle between each pixel area and each pupil position in a display panel and a driving voltage value of each pixel area at the lateral viewing angle corresponding to each pixel area; and applying the driving voltage value to the corresponding pixel area.

According to an embodiment, a holographic microscope comprises a light source emitting light to an object, a beam splitter reflecting the light emitted from the light source to the object and transmitting object light reflected from the object, a holographic image sensor sensing information, including a holographic image, by receiving the object light and allowing the object light to coherently interfere with reference light, and an image processor obtaining three-dimensional (3D) information about the object based on the information sensed by the holographic image sensor. The holographic image sensor includes a lens focusing the object light to the holographic image sensor, a filter transmitting a predetermined wavelength band of light of the focused object light, a light receiving unit receiving interference light to sense a holographic image, and a reference light source directly emitting the reference light having the predetermined wavelength band to the light receiving unit.

A method of determining a hologram of an image for a system comprising a display device and viewing system. The display device is arranged to display the hologram. The viewing system is arranged to view the hologram through a pupil expander. The pupil expander provides a plurality of light propagation paths from the display device to the viewing system. The method comprises first to fifth stages. The first stage comprises determining a first complex light field at an entrance pupil of the viewing system. The first complex light field results from the propagation of light from a display plane of the display device along at least one light propagation path of the pupil expander. The first stage also comprises cropping in accordance with the entrance pupil of the viewing system. The second stage comprises determining a second complex light field at a sensor plane of a sensor of the viewing system. The second complex light field results from the propagation of light of the first complex light field from the entrance pupil through a lens of the viewing system. The second stage also comprises modifying the amplitude component in accordance with the image. The third stage comprises determining a third complex light field at the entrance pupil. The third complex light field results from the reverse propagation of light of the second complex light field from the sensor plane back through the lens. The third stage also comprises cropping in accordance with the entrance pupil. The fourth stage comprises determining a fourth complex light field at the display plane. The fourth complex light field results from the propagation of light of the third complex light field back along the at least one light propagation of the pupil expander. The fourth stage also comprises cropping in accordance with the display device. In a fifth stage, the hologram is extracted from the fourth data set.

There is provided a hologram that includes a formation layer and a reflection layer that are laminated. The formation layer has an optical phase modulation structure on a first interface in contact with the reflection layer. When reference light emitted from a point light source enters through a second interface different from the first interface of the formation layer, the entirety or part of an image to be reconstructed by the optical phase modulation structure is reconstructed as spatial information on the point light source side relative to the second interface.

Provided is a system and method for holographic light curtains. A system includes a holographic projector configured to project a holographic image, a rolling-shutter camera arranged to receive light from the holographic image, and at least one processor in communication with the rolling-shutter camera, the at least one processor programmed or configured to: determine an intensity of the light received from the holographic image; and detect a disturbance in a space of the holographic image based on a change in the intensity.

Provided a holographic display apparatus including a light guide plate including an input coupler and an output coupler, a holographic image generating assembly configured to generate a holographic image and provide the holographic image to the input coupler of the light guide plate, and an image processor configured to convert source image data based on a point spread function, which is obtained for each pixel of the holographic image on an image plane, to compensate for a blur of the holographic image output through the output coupler.

Various embodiments set forth eye tracking systems. In some embodiments, an eye tracking system includes a polarization volume hologram (PVH) combiner having a rolling k-vector design that provides relatively wide coverage of users whose eyeglasses prescriptions can vary. The PVH combiner can further include (1) fiducial regions created by differential patterning that generate dark regions in images captured of an eye, and / or (2) multiple regions that diffract light at angles to produce different perspectives in the captured images. The dark regions and / or different perspectives can be used to calibrate eye tracking. In addition, the PVH combiner can include off-axis lens regions that generate glints for the eye tracking.