TERMIUM Plus®

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IMAGE SKEW [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2006-06-14

English

Subject field(s)
  • Remote Sensing
CONT

Preprocessing is an important and diverse set of image preparation programs that act to offset problems with the band data and recalculate DN [Digital Number] values that minimize these problems. Among the programs that optimize these values are atmospheric correction(affecting the DNs of surface materials because of radiance from the atmosphere itself, involving attenuation and scattering) ;Sun illumination geometry; surface-induced geometric distortions; spacecraft velocity and attitude variations(roll, pitch, and yaw) ;effects of Earth rotation, elevation, curvature(including skew effects), abnormalities of instrument performance(irregularities of detector response and scan mode such as variations in mirror oscillations) ;loss of specific scan lines(requires destriping), and others. Once performed on the raw data, these adjustments require appropriate radiometric and geometric corrections.

OBS

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

French

Domaine(s)
  • Télédétection
CONT

La première étape de prétraitement des données SAR correspond à la transformation des données 16 bits en données 8 bits et ce, afin de faciliter la manipulation ainsi que la combinaison avec les autres données optiques qui sont, généralement, sur 8 bits. La deuxième étape consiste à réduire le châtoiement inhérent aux images SAR [radar à synthèse d'ouverture] [...] La troisième étape comprend le prétraitement des données TM [Thematic Mapper] de Lansat dont le but vise essentiellement l'amélioration de la qualité des images. Cette étape est effectuée en trois phases : la superposition géométrique, le géocodage des images optiques comparées à une image SAR disponible de type GEC [Geocoded Ellipsoid Corrected] et, enfin, le rééchantillonnage des pixels à une résolution de 25 m.

OBS

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

Spanish

Save record 1

Record 2 1999-09-07

English

Subject field(s)
  • Graphic Arts and Printing
DEF

The angular displacement of the axis of an image from its intended alignment.

OBS

To measure the angular displacement, a line is drawn which represents the actual axis of the printed image. From a point at one end of the line, another line is drawn which is parallel to the top of the page or to the intended axis. If any skew exists, these two lines will not be identical but will be displaced from each other.

OBS

Quality assurance.

Key term(s)
  • image skewness

French

Domaine(s)
  • Imprimerie et arts graphiques
DEF

Déplacement angulaire de l'axe de l'image par rapport à l'alignement prévu.

Spanish

Save record 2

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