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IMAGE HOLOGRAM [37 records]

Record 1 2025-01-06

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

Second, there is liquid-surface holography, in which, usually, the liquid surface, disturbed by both the scattered and the reference acoustic field, is used to reflect light which is made to produce the final image; the hologram itself is at the surface.

Key term(s)
  • liquid surface holography

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 1

Record 2 2024-01-27

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

A later solution [to the lighting issue was an] ’edge-lit’ hologram … which employed a prism to channel light into a glass-plate hologram at the optimal angle to reconstruct the three-dimensional image.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 2

Record 3 2023-12-14

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

If a plane-wave reference is used for recording and for reconstruction, then the reconstructed image will coincide with the magnified image of the object in amplitude, although the phase will contain the curvature due to the imaging lens. Alternatively, holographic interference of the object and the plane-wave reference can be formed first and its magnified image projected near the hologram plane...

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 3

Record 4 2023-02-28

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

The high-efficiency hologram … uses a metasurface as a phase modulator to generate reflective hologram … rather than the transmitting image that was formed with light propagating through four layers of metal structures.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 4

Record 5 2023-02-28

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

A photograph, as a two-dimensional recording of an image formed by a lens, can be blurred from the start; the sharpness of the image is not affected by the light source used to illuminate it. The situation, however, is completely reversed for an optical hologram, which is a recording of a stationary quantum interference pattern, not an image.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie
CONT

L'acquisition d'un hologramme optique s'effectue à l'aide d'un processus d'interférence entre deux faisceaux lumineux issus d'un laser.

Spanish

Save record 5

Record 6 2023-02-28

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

The upscaling quality of holograms was verified by comparing the upscaled hologram with the high-resolution hologram. The hologram image upscaled with deep learning network provides better quality in diffraction patterns and reconstruction compared with conventional upscaling methods.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 6

Record 7 2023-02-28

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
DEF

A hologram [that] gives shifted images of the logic array to provide nearest neighbour interaction for image processing applications.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 7

Record 8 2023-02-28

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

It may be interesting to know that the best image resolution in a phase in-line hologram … was obtained with the direct bleaching technique(bromine-methanol), where no ion diffusion takes place during processing.

Key term(s)
  • phase inline hologram
  • inline phase hologram

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 8

Record 9 2023-02-28

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

In essence, [optical coherence tomography(OCT) ] provides a multifrequency hologram and the refocusing method may be applied frequency-by-frequency to effectively move the focal plane even to planes outside the Rayleigh range. However, the image in the plane of the original focus is then out of focus.

Key term(s)
  • multi-frequency hologram

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 9

Record 10 2022-08-15

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
DEF

A hologram exhibiting optical power in transforming an object point to a conjugate image point.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 10

Record 11 2022-08-08

English

Subject field(s)
  • Computer Memories
  • Information Processing (Informatics)
  • Optics
CONT

... if a hologram is read out by one of its stored data, then its associated output corresponding to the other will be recalled. In principle, the holographic associative memory utilizes a correlation and a convolution in order to identify and to reconstruct a desired image and/or pattern.

French

Domaine(s)
  • Mémoires (Informatique)
  • Traitement de l'information (Informatique)
  • Optique

Spanish

Save record 11

Record 12 2022-08-05

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

To accelerate optical time reversal based on on-axis interferometry, the quasisingle-shot method was proposed and widely used in many fast [digital optical phase conjugation(DOPC) ] systems for focusing through scattering media. However, this method needs to acquire two images for optical time reversal : one image for the reference beam, and the other one for the interferometric hologram.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 12

Record 13 2022-06-22

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

Incoherent digital holography refers to a group of methods, in which a 3D [three-dimensional] scene, illuminated by incoherent light, is recorded onto a two-dimensional digital hologram. Since the hologram is stored digitally in the computer, the image of the scene is usually reconstructed from the hologram by a digital computation.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 13

Record 14 2022-06-14

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

There are two types of representative IDH [incoherent digital holography] techniques : IDH with a structured illumination and a single photodetector termed optical scanning holography and self-interference IDH. The latter IDH is a technique to obtain an incoherent digital hologram by modulating an incoherent light wave between an object and an image sensor.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 14

Record 15 2022-05-31

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

A phase-only hologram … can be calculated from an object image with various methods such as Gerchberg-Saxton iterative algorithm, error diffusion algorithm, random phase mask method and down-sampling mask method.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 15

Record 16 2022-05-31

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

The image recorded on the holographic plate is called a hologram of the target, which carries both the amplitude and phase of the returned, scattered beam from the target. The first exposure of the holographic plate by the reference beam results in a reference hologram, while the second exposure by the returned beam imposes all changes of the target to the reference hologram.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 16

Record 17 2022-04-29

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

… by this type of hologram deformation, it is possible to retrieve the EFI [extended focus image] of a tilted object, putting all parts of the object in focus in a single constructed image.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 17

Record 18 2022-02-28

English

Subject field(s)
  • Astrophysics and Cosmography
  • Space Physics
CONT

The holographic principle is an emerging notion within physics that the universe we know could be viewed as holographic. A hologram is essentially a means of storing the information for a system in a form that exists a dimension lower, like a 3D image projected from a 2D film.

French

Domaine(s)
  • Astrophysique et cosmographie
  • Physique spatiale

Spanish

Save record 18

Record 19 2021-09-29

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

Another way of making the original photographs for mastering is to take the camera round the subject at a constant distance … The photographs are combined in the same way, but this time the finished hologram is part of a cylinder, with the image of the subject at its center. Cylindrical stereograms are a kind of one-step rainbow hologram.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 19

Record 20 2021-08-30

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

Optoelectronic reconstruction can be realized by using an electronic addressing reflective liquid-crystal display(LCD) spatial light modulator. A binary digital hologram from the computer is loaded on a LCD panel. A clear image can be observed in the distance by illuminating a reference light from a laser source to the liquid-crystal panel.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 20

Record 21 2021-08-30

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

The Fourier-Fraunhofer hologram, in which the object and the reference source are at infinity in the recording step, is the only practical case where an aberration-free image may be reconstructed from a plane hologram when the reconstruction source is not at the same place as the reference source relative to the hologram.

PHR

binary Fourier hologram

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie
DEF

Hologramme formé par un objet plat situé dans le point focal d'une lentille.

Spanish

Save record 21

Record 22 2021-01-17

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
DEF

A hologram made with a real image as object.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie
CONT

L'hologramme image est enregistré dans le plan focal image de la lentille [...] Cet enregistrement est utilisé lorsque l'objet n'est pas trop profond.

Spanish

Save record 22

Record 23 2021-01-16

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
DEF

A hologram in which the image is viewed only by laser … light.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 23

Record 24 2021-01-16

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

The image is created by splitting [it] into vertical slit-shaped component holograms, and then exposing them in order. Each component hologram is collected in the left-right direction(parallax direction) … As a result, each component hologram has a two-dimensional image recorded in it. But because there is appropriate parallax information in each image that is exposed onto the component hologram, the entire photograph looks like a 3-D image

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 24

Record 25 2021-01-16

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
DEF

[A hologram] that takes up selected parts of the viewing light so that the rest can go into making the image.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 25

Record 26 2020-12-04

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
DEF

A hologram that must be illuminated by a wave exactly like the reference wave if the image of the object is to be seen.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 26

Record 27 2020-11-26

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

The typical transmission hologram is viewed with laser light, usually of the same type used to make the recording. This light is directed from behind the hologram and the image is transmitted to the observer's side.

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie
CONT

Il existe deux types d'hologrammes : les hologrammes par réflexion, qui sont observables avec une lumière blanche (lumière du soleil ou d'une lampe), et les hologrammes par transmission qui sont seulement observables en lumière monochromatique et cohérente (lumière laser).

Spanish

Save record 27

Record 28 1991-05-27

English

Subject field(s)
  • Computer Graphics
DEF

A hologram having an image scale that is orders of magnitude smaller than microfiche images.

French

Domaine(s)
  • Infographie

Spanish

Save record 28

Record 29 1991-05-16

English

Subject field(s)
  • Computer Graphics

French

Domaine(s)
  • Infographie

Spanish

Save record 29

Record 30 1991-05-16

English

Subject field(s)
  • Computer Graphics

French

Domaine(s)
  • Infographie

Spanish

Save record 30

Record 31 1991-05-16

English

Subject field(s)
  • Computer Graphics

French

Domaine(s)
  • Infographie

Spanish

Save record 31

Record 32 1991-04-22

English

Subject field(s)
  • Computer Graphics

French

Domaine(s)
  • Infographie
OBS

Hologramme créé à partir d'un premier hologramme appelé hologramme maître.

Spanish

Save record 32

Record 33 1991-04-22

English

Subject field(s)
  • Computer Graphics
DEF

The angle that the light must strike a hologram to reconstruct the holographic image. This angle is set by the angle of the reference beam when the hologram was constructed.

French

Domaine(s)
  • Infographie

Spanish

Save record 33

Record 34 1990-06-07

English

Subject field(s)
  • Computer Graphics
OBS

A multicoloured image produced by a hologram.

French

Domaine(s)
  • Infographie

Spanish

Save record 34

Record 35 1990-05-16

English

Subject field(s)
  • Computer Graphics
DEF

The ratio of the power diffracted into the reconstructed image to the total power incident upon the hologram.

French

Domaine(s)
  • Infographie

Spanish

Save record 35

Record 36 1990-03-09

English

Subject field(s)
  • Computer Graphics
DEF

The indistinct, highly distorted image produced on the side of the hologram closest to the observer, in addition to the primary image.

French

Domaine(s)
  • Infographie

Spanish

Save record 36

Record 37 1987-05-01

English

Subject field(s)
  • Computer Graphics
  • Lasers and Masers

French

Domaine(s)
  • Infographie
  • Masers et lasers

Spanish

Save record 37

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