153results about "Holographic object characteristics" patented technology

Methods, apparatus, devices, and systems for displaying three-dimensional objects by individually diffracting different colors of light are provided. In one aspect, an optical device includes: a first optically diffractive component including a first diffractive structure configured to diffract a first color of light having a first incident angle at a first diffracted angle, a second optically diffractive component including a second diffractive structure configured to diffract a second color of light having a second incident angle at a second diffracted angle, a first reflective layer configured to totally reflect the first color of light having the first incident angle and transmit the second color of light, and a second reflective layer configured to totally reflect the second color of light having the second incident angle. The first reflective layer is between the first and second diffractive structures, and the second diffractive structure is between the first and second reflective layers.

According to one embodiment, there is provided an optical film (10) with a recording surface (14), the recording surface (14) including: a computation element section (16) in which a phase component of light from each reconstruction point (22) of a reconstructed image is computed, the computation element section corresponding to each reconstruction point one by one; a phase angle recording area (18) in which a phase angle computed based on the phase component is recorded; and a phase angle non-recording area (20) in which the phase angle is not recorded, the phase angle computed based on the phase component being recorded in an overlapping area where the computation element section (16) and the phase angle recording area (18) overlap each other.

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.

The present invention relates to an automatic real-time label-free holography-activated sorting of the cell's technique. The technique provides high-discriminative power on the level of the individual cell. The technique includes rapid automated cell processing during cell visualization and flow, with high discriminative power on the level of the individual cell. The technique may be useful in detection of cancer and to identify different stages of oncogenesis.

One embodiment provides a method comprising obtaining a Fourier transform of an interference pattern, obtaining a central band component from the Fourier transform of the interference pattern, obtaining a sideband component from the Fourier transform of the interference pattern, obtaining a central band inverse Fourier transform image by performing an inverse Fourier transform of the central band component, obtaining a sideband inverse Fourier transform image by performing an inverse Fourier transform of the sideband component, and determining a fringe height reduction factor, the fringe height reduction factor corresponding to an interference fringe height reduction due to motion blur in the interference pattern, based on a comparison between the sideband inverse Fourier transform image and the central band inverse Fourier transform image.

There is provided an optical film (10) including a recording surface (14) on which a plurality of unit blocks (12) are disposed at regular intervals. For these unit blocks (12), phase components of light from a reconstruction point (22) are calculated. The recording surface (14) includes a calculated element region (16) provided with an array of the unit blocks (12) for which phase components of light from the reconstruction point (22) are calculated for reproduction of an image. A first image is a monotone reconstruction image having even brightness, and a second image is a grayscale image having brightness gradation.

An optically variable image device 1 forms an observable optically variable image / output light pattern, of light 11 scattered from a three-dimensional object / scene 7. A layer 2 of optical material has multiple pixels 3, each pixel encoded with a respective portion of the image, as a representation of scattered light 11 from the object / scene. That portion of the scattered light from the object / scene which is scattered from a respective sub-area 505,508 located on a pre-selected surface 6 of the object / scene corresponds by mapping to the respective pixel 305,308 in which its representation is encoded. Each pixel includes a respective optical structure with optical properties forming a respective phase modulated non-planar wavefront component 12 of the output light pattern. This component (i) corresponds to the respective portion of the image to be formed that is recorded in that pixel, and (ii) has a phase modulation that is characteristic of / a function of, the modulating optical properties of the respective optical structure of that pixel. The component’s shape is independent of the wavefront’s shape of the scattered light from the respective sub-area. The component formed by each pixel has at least one respective main propagation direction 1012,1015. The device may be for security / authentication.

This application relates to a holographic display device comprising a backlight unit and a spatial light modulator, wherein the backlight unit is used to emit light. The spatial light modulator includes a plurality of pixels and a color filter layer comprising a plurality of color filter groups. The pixels are arranged in a zigzag pattern and configured to modulate at least one of the amplitude and phase of the light. Each of the color filter groups includes a first subgroup, a second subgroup, and a third subgroup, the first subgroup including a plurality of first color filters, the second subgroup including a plurality of second color filters, and the third subgroup including a plurality of third color filters, and each pixel is aligned with one of the first, second, and third color filters of the color filter layer.

The invention relates to a method (1000) for manufacturing a hologram security element (2000) comprising the steps: Capturing (1010) image information; Calculating (1020) a phase image that corresponds to the image information in the far field; Folding (1030) the phase image with the imaging function of at least one optical element to assign the far field image information to a different display position; Arranging a holographic recording material in front of a reflective spatial phase modulator such that one side of the holographic recording material faces the spatial phase modulator, Exposure of the recording material with coherent light (52) from the side facing away from the spatial phase modulator, such that the coherent light incident on the side facing away from the spatial phase modulator interferes in the holographic recording material with the phase-modulated light reflected from the reflecting spatial phase modulator in order to store a hologram in the recording material (1100).

The invention relates to a system (1) for digital holographic imaging, comprising at least the following components: a beam splitter (2) that defines four sides with a beam splitter surface (2a), a retroreflector array (3) that is arranged on the second or the third side (22, 23) and comprises a plurality of retroreflector elements (30), and a reference mirror (4) that is arranged on an adjacent side (23, 22) to the retroreflector array (3), wherein the system (1) is configured to impress wavelength-dependent phase shifts on object light (100) for each retroreflector element (3), said phase shifts being different for a plurality of retroreflector elements (3).

The present disclosure relates to a device for printing dual holographic, including a plurality of lasers that represents different wavelengths, a plurality of dichroic lenses and mirrors that combine beams output from the plurality of lasers into one beam and output the combined beam as a white beam, a plurality of beam splitters that separates the white beams output through the plurality of dichroic lenses and mirrors, transmit the separated white beams to a stereogram printing device, a wavefront printing device, and a reference beam, separates a beam heading to the reference beam, and transmits the separated beam to the stereogram printing device and the wavefront printing device, and a computer that controls the stereogram printing device and the wavefront printing device so that a hologram is printed with the beam transmitted through the beam splitters.

A holographic display includes a light source configured to emit incoherent light, a spatial light modulator (SLM) disposed at a Fourier plane of the light source and configured to modulate the incoherent light and emit the modulated incoherent light as diffused light, and at least one lens disposed downstream of the spatial light modulator and configured to focus the modulated incoherent light, and the spatial light modulator receives an RGB-D image signal and converts the incoherent light array incident from the light source into a first light, which is a coherently-reconstructed incoherent sum (CRIS) for implementing a 3D hologram.

The present invention improves user experience. The information processing apparatus includes a grouping unit (21) that groups a plurality of pixels constituting one or more objects included in one piece of image data into one or more groups, a phase adjustment unit (22) that assigns a phase pattern having a different phase difference for each of the one or more groups to the plurality of pixels, and a calculation unit (30) that generates hologram data from the image data to which the phase pattern is imparted.

Concealed Individualized Hologram Security Element and Method and Device for Verification The invention relates to a method (1000) for producing a hologram security element (2000) comprising the steps: capturing (1010) image information; calculating (1020) a phase image that corresponds to the image information in the far field; folding (1030) the phase image with the imaging function of at least one optical element to assign the far-field image information to a different display position;Arranging a holographic recording material in front of a reflective spatial phase modulator, such that one side of the holographic recording material faces the spatial phase modulator, exposing the recording material with coherent light (52) from the side facing away from the spatial phase modulator, so that the coherent light incident on the holographic recording material from the side facing away from the spatial phase modulator interferes with the phase-modulated light reflected from the reflective spatial phase modulator in order to store a hologram in the recording material (1100). The invention further relates to a manufacturing device, a verification method and a verification device.

This disclosure provides an apparatus for modulating light, the apparatus comprising a substrate having a plurality of electrical interconnects disposed on its top surface and an array of optical modulation elements disposed on the substrate. The optical modulation elements of the apparatus include an array of optical modulation elements, the array including a bottom electrode disposed on the substrate, wherein the bottom electrode is coupled to an electrical interconnect among the plurality of electrical interconnects, a bottom surface of a first dielectric layer is located above the bottom electrode, and a quantum well layer covering the top surface of the first dielectric layer. A second dielectric layer is then configured to cover the top surface of the quantum well layer, wherein each optical modulation element of the optical modulation element array is spatially separated from each of the other optical modulation elements of the array, and the top electrode is located on top of the optical modulation element array.

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.

The present invention relates to an optical system (1) for three-dimensional imaging, the optical system (1) comprising at least the following components: - an input aperture (2) having an optical axis (OA), a first metalens array (3) and a second metalens array (4); - detector (5), Equipped with the input aperture (2) is configured to collimate an object beam (10) coming from an investigation object (S) in a first spectral range and fix it in a predetermined polarization state, wherein the object beam (10) propagates into the first metalens array (3) at a first tilt angle (β) with respect to an optical axis (OA) of the input aperture (2); the first metalens array (3) is constructed and arranged to focus a first portion (101) of the object beam (10) and leave a second portion (102) of the object beam (10) unchanged; The second metalens array (4) is constructed and arranged to collimate the focused first portion (101) and transmit the second portion (102) unchanged, such that the first portion (101) and the second portion (102) subtend a second tilt angle (β') with each other relative to their respective propagation directions and form interference fringes upon impinging on the detector (5), wherein the second tilt angle (β') corresponds to twice the magnitude of the first tilt angle (β), of the optical system (1).

A method for a display device begins by receiving data representing a set of two-dimensional (2D) scene layers, where each 2D scene layer has a corresponding predetermined display depth in a focus space, and generating a first hologram pattern for each 2D scene layer of the set of 2D scene layers to create a set of first hologram patterns, wherein each first hologram pattern of the set of first hologram patterns is adapted to place an associated 2D scene layer at an infinite depth. The method continues by converting each first hologram pattern in the set of first hologram patterns into a second hologram pattern using a mathematical lens function to create a set of second hologram patterns, wherein each second hologram pattern is adapted to place an associated 2D scene layer at a corresponding predetermined display depth in the focal space. Finally, the method continues by aggregating the set of second hologram patterns to provide an aggregated hologram pattern.

A microscopy system and method use super-resolution to generate the equivalent of a digital holographic image. Through super-resolution, images of nanoscale sized objects may be captured without interrupting the object (for example, a virus) or the object's environment. The information gathered through super-resolution techniques may be transformed into holographic replications of the object which may be analyzed with greater accuracy of the object.

Systems and method disclosed herein include, among other features, receiving an image for display within a display area of a display system, determining a first image component of the image, calculating a hologram of the image, displaying the hologram on a display device and spatially modulating light in accordance with the displayed hologram, and propagating the spatially modulated light through a pupil expander arranged to provide a plurality of different light propagation paths for the spatially modulated light from the display device to the viewing area, wherein each light propagation path corresponds to a respective continuous region of the image owing to the angular distribution of light from the hologram.

A holographic display system (100) for generating a super hologram (150) with full parallax in the horizontal and vertical directions. The system includes an array of holographic display devices (110), e.g., spatial light modulators (SLMs, 114), operable to provide a plurality of holographic images (115) of a scene from differing viewpoints of the scene. Each SLM is operated concurrently to output a narrow field of view, elemental hologram. The system includes coarse integral optics (120) combining the holographic images into a single hologram ("super hologram", 150) viewable in a hologram image plane a distance from the coarse integral optics. The coarse integral optics combine the holographic images by providing angular tiling of the holographic images, e.g., bending the axes (141) of parallel lenses. In this manner, the field of view, in one direction, of the super hologram is based on the number of holographic display devices provided in the array in one direction.

An advance in high-resolution optical metrology has been achieved by the introduction of incoherent holographic imaging. FINCH, an example of incoherent holography, is shown to simplify the process, eliminating many steps in metrology and at the same time increasing throughput, resolution and accuracy of the method. A proposed technique requires only a single image capture with a non-moving camera rather than the capture of multiple stacks of images requiring many camera exposures and movement of the camera or sample in the conventional techniques.

An optical security device (1) comprising a recorded or encoded representation of an optically variable image (40), the image (40) being reconstructable and viewable for security, authentication or identification purposes, the device (1) comprising: an optical structure (30) in which there is recorded or encoded a representation of the optically variable image (40) in the form of a plurality of discrete portions (e.g. 50) of the complete image (40) to be reconstructed, wherein the respective said plurality of portions (e.g. 50) of the optically variable image (40) can, when reconstructed, only be viewed in their totality by viewing the said image (40) at or over a plurality of different viewing angles or angle ranges (70) relative to the optical structure (30) and / or at or over a plurality of different angles or range of angles of illumination of the optical structure (10), and wherein the size, in at least one dimension, direction, axis or plane, of the complete image (40), when reconstructed, is greater than the corresponding size, in the same, or the respective same, dimension, direction, axis or plane, of a part of the optical structure (30) having the said plurality of portions (e.g. 50) of the image (40) collectively recorded or encoded therein.

Measuring holographic replay field, comprising: forming holographic replay field (509, 609, Fig. 8; 809) at plane comprising housing, wherein holographic replay field comprises image area (511, 611, F

28 H16458WO ABSTRACT SYSTEMS, APPARATUS AND METHODS FOR AUTHENTICATION A server for authenticating a label comprising a plurality of respective visual markers each encoding a respective code is configured to receive a label authentication request for authenticating the label 5 from a user device, access a set of codes, wherein the set of codes comprises at least a two stored codes, perform a label authentication process in which at least a first code and a second code respectively decoded from respective visual markers of the label are to be validated with the set of codes, and provide the user device with access to at least one of a web service and a downloadable software application in dependence on whether at least the first code and the second code are 10 validated with the set of codes.

A real-time, in situ and automated technology and method for dynamic observation of airborne viruses has been developed, and its application for airborne viruses, using a model virus, MS2 bacteriophage, and SARS-COV-1 RNA, has been demonstrated. There is described a method of performing measurements using a digital in-line holographic microscope (DIHM). The method generally has: propagating a light beam through a pinhole, across a medium including particles, and to a sensor; acquiring, with the sensor, a plurality of holograms, the holograms including scattering information of the particles; and determining, from a reconstruction of the holograms, at least one of shape, size, intensity and phase of the particles from the scattering information of said particles.

Methods, devices, and systems are provided for displaying three-dimensional objects by individually diffracting light of different colors. In one aspect, an optical diffractive device includes a first diffractive element, a second diffractive element, and a color-selective polarizer therebetween. The first diffractive element is configured to diffract light of a first color in a first polarization state incident at a first angle of incidence with a first diffraction efficiency at a first diffraction angle and to diffract light of a second color in a second polarization state with a diffraction efficiency substantially less than the first diffraction efficiency. The polarizer is configured to rotate a second polarization state of the second color light to the first polarization state. The second diffractive element is configured to diffract light of the second color in the first polarization state with a second diffraction efficiency at a second diffraction angle substantially equal to the first diffraction angle.

The invention relates to a method for verifying a hologram security element (2000) comprising a computer-generated phase hologram (2100) exposed in a manner similar to or identical with a Denisyuk reflection hologram, wherein the computer-generated phase hologram (2100) is the phase image corresponding to the image information in the far field, folded with an imaging function of at least one optical element, and wherein the method comprises the steps: Illumination of coherent light onto the hologram security element (2000) and projection of the light diffracted at the hologram security element onto a reconstruction plane, acquisition of image information (2150) projected onto the reconstruction plane and evaluation of the image information (2150) against a specification, output of a verification decision depending on the comparison with the specification.

A method comprising obtaining at least two signals based on scattered radiation from a metrology target and detected by a radiation sensor of a metrology system obtaining a first data set comprising the phases of the at least two signals calculating from the first data set a correction of an intensity value of a signal as detected by a radiation sensor.

The invention relates to a system (1) for digital holographic imaging, comprising at least the following components: - a beam splitter (2), - a retroreflector array (3) comprising a plurality of retroreflector elements (30), - a reference mirror (4), wherein the system (1) is configured to superimpose the object light (100) reflected off the reference mirror (4) and off the retroreflector array (3) such that a plurality of interference patterns that can be assigned to the respective retroreflector elements (30) are produced, wherein the system (1) has a phase-adapting optical structural component (5) for predefined phase adaptation of the object light (100), characterized in that the phase-adapting optical structural component has an assigned angle-of-incidence / phase relation (1000) for each of a predefined plurality of incidence directions (e) of the object light (100), wherein the phase-adapting optical structural component (5) is configured to impress phases (Φ) on the object light (100) in accordance with the assigned angle-of-incidence / phase relation (1000) for each of said plurality of incidence directions such that the interference patterns comprise information with which a hologram correspondingly reconstructed from said interference patterns has an improved resolution with respect to a system (1) without the predefined phase adaptation.