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NUMERICAL IMAGE [7 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2014-04-30

English

Subject field(s)
  • Scientific Instruments
  • Atomic Physics
CONT

... the thermionic projection microscope [is] used for measuring the work functions of separate crystal planes. Electrons emitted from the planes are collected on a phosphor screen, and a video camera is used to produce a digitized image of the intensity pattern. Numerical calculations yield the work function associated with each plane.

French

Domaine(s)
  • Instruments scientifiques
  • Physique atomique
PHR

Microscope à émission thermoionique à haute température.

Spanish

Campo(s) temático(s)
  • Instrumentos científicos
  • Física atómica
CONT

[...] puede darse el caso de que la superficie en estudio tenga algún contaminante que opaque la emisión de electrones. Este efecto de emisión termoiónica ha sido usado para desarrollar el microscopio de emisión termoiónica, en el que el contraste es generado por la diferencia en función trabajo de un punto a otro de la muestra.

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Record 2 2013-06-20

English

Subject field(s)
  • Remote Sensing
  • Cartography
CONT

Automated numerical methods can include supervised and unsupervised classification and image segmentation algorithms... These methods provide alternatives for extracting geological information in a systematic and unbiased manner, although visual interpretation is commonly judged to outperform methods of automated pattern recognition.

French

Domaine(s)
  • Télédétection
  • Cartographie

Spanish

Save record 2

Record 3 2013-06-20

English

Subject field(s)
  • Remote Sensing
  • Cartography
DEF

A numerical number... assigned to each spatial grid position in the file representing the brightness levels of an image.

CONT

Data generated are readily available in digital format, in the form of a raster or grid in which individual image elements, called pixels, contain a digital number (DN) that is proportional to the amount of solar energy reflected at a given wavelength.

French

Domaine(s)
  • Télédétection
  • Cartographie

Spanish

Save record 3

Record 4 2006-05-12

English

Subject field(s)
  • Remote Sensing
DEF

On an image, a group of lines or bands having equaldensities or numerical values.

French

Domaine(s)
  • Télédétection
DEF

[Ensemble des] lignes ou des plages d'une image qui représentent des teintes ou des valeurs numériques égales.

Spanish

Save record 4

Record 5 2005-10-13

English

Subject field(s)
  • Remote Sensing
OBS

Contrast enhancement. Improving the picture by turning up the contrast. Most digital image display systems allow one to break each ’primitive’ colour into 256 degrees of intensity. An image that uses this entire intensity scale, that is, that contains values coded from 0 to 255, has excellent contrast, for the colour range will extend from black to white and include fully-saturated colours. In contrast, an image that uses a narrow range of numerical values will lack contrast(it will look ’greyish’).

OBS

nonlinear contrast enhancement: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG).

Key term(s)
  • non-linear contrast enhancement
  • non linear contrast enhancement

French

Domaine(s)
  • Télédétection
CONT

Le rehaussement non linéaire du contraste implique souvent l'égalisation de l'histogramme par un algorithme. La méthode d'étirement non linéaire du contraste a un inconvénient important [:] chaque valeur dans l'image d'entrée peut avoir plusieurs de valeurs dans l'image de sortie.

OBS

rehaussement non linéaire de contraste : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Key term(s)
  • rehaussement non linéaire de contraste

Spanish

Save record 5

Record 6 2002-03-15

English

Subject field(s)
  • Remote Sensing
DEF

In analysis, the removal of certain spectral or spatial frequencies to highlight features in the remaining image.

CONT

Filtering is an operation designed to improve image readability and/or to extract certain information from them. The principle of the various filters is to modify the numerical value of each pixel as a function of the neighbouring pixel values. For example, if the value of each pixel is replaced by the average of its value and those of its eight neighbours the image is smoothed, that is to say, the finer details disappear and the image appears fuzzier. In "mobile window filtering" the programme computes for a given pixel the sum of the products of the neighbouring pixel values multiplied by coefficients given in a table of coefficients, then repeats the operation for the next pixel and so on.

OBS

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

French

Domaine(s)
  • Télédétection
DEF

En analyse des données, élimination de certaines fréquences spectrales ou spatiales qui permettent d'accentuer des caractéristiques spécifiques d'images.

CONT

[...] le filtrage de l'image consiste à recalculer la valeur de chaque pixel en analysant les radiométries sur un voisinage, par exemple, pour lisser l'image ou au contraire pour accentuer les contrastes.

OBS

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

PHR

Filtrage adapté.

Spanish

Save record 6

Record 7 1989-08-31

English

Subject field(s)
  • Computer Graphics
CONT

Two-dimensional numerical convolution is performed with the effect of selectively filtering the image to improve its subjective quality, compensating for information lost while in the video medium.

French

Domaine(s)
  • Infographie

Spanish

Save record 7

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