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IMAGE CORRELATION [8 records]

Record 1 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 1

Record 2 2022-01-10

English

Subject field(s)
  • Radar, Radio Guidance and Goniometry
  • Target Acquisition
CONT

Area correlation tracking(ACT) is an effective solution for tracking targets that have neither prominent features nor high contrast with the background. The essential step in area correlation tracking is to find the position of best-fit between the reference image of the terrain surrounding the desired target to the real-time scene acquired by an imaging sensor.

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie
  • Acquisition d'objectif

Spanish

Save record 2

Record 3 2020-12-18

English

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

A holographic demultiplexer, in conjunction with an aperture, is used to identify the location and the angle of the brightest correlation peak [in a query image].

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

Save record 3

Record 4 2017-05-18

English

Subject field(s)
  • Remote Sensing
DEF

A remote-sensing term referring to the process of assigning different colours to different spectral bands.

CONT

The image processing consisted in generating intensity images and one coherence image. To facilitate their analysis and interpretation, a coloured composition has been created with the results. This composition is obtained by adding the coherence image in red, the average of both images phase intensities in green and the difference between these phase intensities in blue. As such, a high coherence level(value close to 1) appears in red and indicates a very good phase correlation between the two images, a consequence of the various mechanisms of radar signal scattering and of the lack of change which could affect the target. On the contrary, a weak coherence level(value tending to 0) appears in black and indicates a movement in these zones during the 24 hours interval which separated the two image shots. Lastly, the white spots correspond to areas with a strong radar signal backscattering i. e. with zones of hills or vegetation.

Key term(s)
  • color composition
  • colored composition

French

Domaine(s)
  • Télédétection
CONT

Dans les systèmes de télédétection, nous avons vu qu'il est possible de détecter et d'enregistrer des parties du spectre électromagnétique qui ne sont pas décelables à l'oeil nu, comme l'infrarouge par exemple. Pour pouvoir visualiser cette information, on associe aux bandes spectrales du système d'observation des couleurs d'affichage (rouge-vert-bleu), qui ne leur correspondent pas nécessairement. Ce faisant, on crée des compositions colorées [...]

Spanish

Save record 4

Record 5 2017-04-03

English

Subject field(s)
  • Remote Sensing
  • Computer Graphics
DEF

The ability to locate or match a region of an image with a corresponding region of another image which can be taken with a different sensor or at a different viewing angle.

OBS

image correlation : term officially approved by the RADARSAT-2 Terminology Approval Group(RTAG).

French

Domaine(s)
  • Télédétection
  • Infographie
DEF

Capacité de faire correspondre la région d'une image avec la région d'une autre image, laquelle image peut être prise à l'aide d'un capteur différent ou à un angle de visée différent.

OBS

corrélation d'images : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Save record 5

Record 6 2012-01-09

English

Subject field(s)
  • Range Measurements (Telecommunications)
  • Radar, Radio Guidance and Goniometry
DEF

A device that measures the coherence between two wave systems to detect weak signals lost in noise.

CONT

While most of existing SAR [synthetic aperture radar] image registration methods try to pre-filter the speckle noise before applying an optical correlator, here we estimate the correlation directly from complex images.

French

Domaine(s)
  • Mesures à distance (Télécommunications)
  • Radar, radioguidage et radiogoniométrie
DEF

Dispositif mesurant la cohérence entre deux systèmes d'onde afin de détecter les signaux faibles plus ou moins perdus dans le bruit.

CONT

Pour répondre à cette interrogation, un concept d'expérience original a été imaginé : deux impulsions laser ultrabrèves de longueurs d'onde différentes mais dont la somme de fréquence est suffisante pour exciter la fluorescence d'un colorant dilué dans la microcavité sont décalées temporellement (expérience pompe-sonde). La fluorescence n'est excitée que lorsque les deux paquets d'onde se recouvrent spatialement : on réalise ainsi un corrélateur optique.

Spanish

Campo(s) temático(s)
  • Medidas de distancia (Telecomunicaciones)
  • Guía radárica, radioguía y radiogoniometría
CONT

Hace más de 30 años Van der Lugt inició una época de expansión de la óptica de Fourier al introducir por primera vez una exitosa configuración para el procesado óptico de datos - el llamado correlador óptico. Esta operación está basada en la capacidad de una lente convexa de realizar una operación proporcional a la transformada de Fourier en dos dimensiones de un objeto y cuya respuesta está localizada en el plano focal.

Save record 6

Record 7 2007-01-31

English

Subject field(s)
  • Remote Sensing
OBS

In an interferogram, coherence is a measure of correlation. It can serve as a measure of the quality. [It gives information] as to the surface type(vegetated vs. rock) or [to an] otherwise invisible change that has occurred in the image [visible only in the phase image of an interferogram].

OBS

Such a measure of correlation ranges from 0.0 (where there is no useful information in the interferogram), to 1.0 (where there is no noise in the interferogram). Both extremes are rarely seen, most images lie somewhere in between. Coherence is affected by low slope, surface properties, time lag between passes, baseline and other technical details of the interferogram.

OBS

interferometric coherence: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG).

French

Domaine(s)
  • Télédétection
CONT

Nous présentons dans ce papier l'apport de la polarimétrie à l'interférométrie SAR par amélioration de la cohérence interférométrique. La corrélation ou la cohérence entre deux images SAR est très sensible aux changements des diffuseurs à l'intérieur du pixel. L'amélioration de la carte de cohérence concerne l'interférogramme. Celui-ci est lié directement à l'altitude du terrain.

OBS

cohérence interférométrique : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Campo(s) temático(s)
  • Teledetección
Save record 7

Record 8 1994-07-21

English

Subject field(s)
  • Artificial Intelligence
DEF

ideal image segment which is compared to an unknown or target image during correlation or pattern matching.

French

Domaine(s)
  • Intelligence artificielle
OBS

Projet de norme ISO sur la visionique.

OBS

Comparer à «nombre d'or».

Spanish

Save record 8

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