68results about "Holographic object characteristics" patented technology

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.

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).

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.

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.

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.

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.

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.

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.

A method of reconstructing an image from a hologram, comprising: receiving an image for display within a display area of a display system, wherein the display area is visible from a viewing area spatially separated therefrom; determining a first image component of the image; calculating a hologram of the image, wherein the hologram is configured to angularly distribute light in dependence on position within the image such that angularly distributed light corresponds to respective contiguous regions of the image; displaying the hologram on a display device and spatially modulating light in dependence on the displayed hologram; 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 contiguous region of the image due to the angular distribution of light from the hologram, wherein the method comprises allocating more data processing resources to calculating the hologram in respect of the first image component of the image than the second image component.

Methods, apparatus, devices, and systems for three-dimensional (3D) displaying objects are provided. In one aspect, a method includes obtaining data including respective primitive data for primitives corresponding to an object, determining an electromagnetic (EM) field contribution to each element of a display for each of the primitives by calculating an EM field propagation from the primitive to the element, generating a sum of the EM field contributions from the primitives for each of the elements, transmitting to each of the elements a respective control signal for modulating at least one property of the element based on the sum of the EM field contributions, and transmitting a timing control signal to an illuminator to activate the illuminator to illuminate light on the display, such that the light is caused by the modulated elements of the display to form a volumetric light field corresponding to the object.

A computer-implemented method for authenticating a label comprising a plurality of respective visual markers, e.g. QR codes, each encoding a respective code, comprises: receiving a label authenticatio

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.

Systems and methods of determining a hologram of an image for a system comprising a display device and viewing system are disclosed. Some embodiments implement a multi-stage procedure comprising (i) determining a first complex light field at an entrance pupil of the viewing system, (ii) determining a second complex light field at a sensor plane of a sensor of the viewing system, (iii) determining a third complex light field at the entrance pupil, and (iv) determining a fourth complex light field at the display plane. Some embodiments include extracting a hologram from a data set corresponding to the fourth complex light field.

A method and system for processing a computer-generated hologram (CGH) are disclosed. The system for processing a CGH includes a CGH generation device and a display device. The CGH generation device repeatedly performs propagating object data from a first depth layer to a second depth layer, changing amplitude data of the object data to second predetermined amplitude data, reverse-propagating the object data from the second depth layer to the first depth layer, changing the amplitude data of the object data to first predetermined amplitude value data, and generating a CGH by using object data.

There is provided a light engine arranged to provide a viewing system with spatially modulated light. The viewing system has an entrance pupil. The light engine comprises a display device arranged to display a hologram and spatially modulate light in accordance with the hologram. The light engine further comprises a hologram engine arranged to receive information identifying at least one primary contributory area of the display device, based on the location of the entrance pupil, that substantially propagate spatially modulated light passing through the entrance pupil at the location that contributes to a primary image. The hologram engine is further arranged to receive information identifying at least one sub-area of the primary contributory area, to determine the hologram in only the at least one sub-areas and to output the hologram to the display device for display. Each sub-area has a greater radial symmetry than the primary contributory area.

Method for obtaining an image of a sample (10), comprising: - a) illumination of the sample using a light source (11); - b) acquisition, using an image sensor (16), of a first image (I1,P0) of the sample (10), formed in the detection plane (P0), the first image being representative of an exposure light wave (14) propagating from the sample, towards the image sensor, along a first optical path (L1); the method comprising, following b) - c) modification of an optical refractive index, between the image sensor and the sample; - d) following c), acquisition, of a second image (I2,P0) of the sample, representative of the exposure light wave (14) along a second optical path (L2); - e) Implementation of an iterative algorithm combining the first and second images to obtain an image of the sample. Figure 2A

A method of using computer-generated holography to determine a corrective lens prescription comprises computing a hologram of an image. An aberration phase map is computed using a set of Zernike pol

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 large number of retroreflector elements (30), - a reference mirror (4), wherein the system (1) is configured to superimpose the object light (100) reflected by the reference mirror (4) and by the retroreflector array (3) so that a multitude of interference patterns attributable to the respective retroreflector elements (30) are created, 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 associated angle-of-incident 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 imprint phases (Φ) on the object light (100) for each of these plurality of incidence directions according to the associated angle-of-incident phase relation (1000), so that the interference patterns contain information with which a hologram reconstructed accordingly from these interference patterns has an improved resolution with respect to a system (1) without the predefined phase matching.

The invention relates to a device for detecting particles by means of lensless imaging, the device comprising a memory (4) arranged to receive a plurality of z-stack images obtained from a lensless image of a biological sample, a picker (6) arranged to determine, on the basis of the z-stack images, a focus image in which each pixel is associated on the one hand with a z-stack image and on the other hand with the intensity of this pixel in this z-stack image, the picker (6) being arranged to determine the z-stack image for a given pixel by calculating, for each of the z-stack images and for the given pixel, the parsimony score on the basis of the intensity of the given pixel and on the intensities of neighbouring pixels, and by selecting the z-stack image for which the parsimony score is highest, a selector (10) arranged to determine, for each pixel of the focus image, whether this pixel is a maximum in a local neighbourhood centred on this pixel in the focus image or in the z-stack image associated with this pixel in the focus image, and, if if it is, to store this pixel in a list of selected sites, and a computer (12) arranged to calculate a metric value for each pixel in the list of selected sites on the basis of the intensity of these pixels to produce an image of the metric values for distinguishing the particles associated with each pixel in the list of selected sites from one another.

Embodiments of the present disclosure provide an imaging device for holographic imaging of a sample, the imaging device comprising a light source generating a light beam, a beam splitter splitting the light beam into an object beam along an object beam path and a reference beam along a reference beam path, and a detector. The imaging device defines a sample position. The object beam is propagated through the sample position, and the detector is arranged to prevent non-scattered object light, passing through the sample position without being scattered by the sample, from being incident onto the detector. The reference beam is propagated through the sample position, and the detector is arranged so that non-scattered reference light, passing through the sample position without being scattered by the sample, is incident onto the detector. The detector detects an interference pattern formed by scattered object light and the non-scattered reference light.

A holographic projector comprises a display device arranged to form a holographic wavefront by spatially modulating light in accordance with a hologram of a picture displayed thereon. The projector co

The present disclosure relates to humidity sensitive nano-photonics and a manufacturing method thereof, and more particularly to humidity sensitive nano-photonics including a metasurface and a method for manufacturing the same.The humidity sensitive nano-photonics and the manufacturing method thereof according to an embodiment of the present disclosure include a metasurface that are capable of expanding and contracting depending on changes in the relative humidity of the surrounding environment, and have the advantage of being easily manufactured, mass-produced at low cost, capable of effectively adjusting the phase and intensity of light, and applicable to various materials and various shapes of surfaces as well.

A head-up display is described. A spatial light modulator is arranged to display a diffractive pattern of first picture content and / or second picture content. A screen assembly has first and second diffusers arranged in a stepped configuration so that the first diffuser is spatially offset from the second diffuser by a perpendicular distance. A light source is arranged to illuminate the diffractive pattern such that the first picture content is formed on the first diffuser and / or the second picture content is formed on the second diffuser. An optical system comprising at least one optical element having optical power is arranged so that the first and second diffusers have different object distances to the optical system.