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IMAGE RECTIFICATION [5 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2015-02-20

English

Subject field(s)
  • Mathematical Geography
  • Photography
  • Biogeography
DEF

The process by which orthophotos are made.

CONT

Orthophotography has made it possible to map areas that would otherwise have gone unmapped ...

OBS

Orthophotos are produced from perspective photos(usually aerial photos) through a process called differential rectification, which eliminates image displacements due to photographic tilt and relief.

French

Domaine(s)
  • Géographie mathématique
  • Photographie
  • Biogéographie
DEF

Processus d'obtention des orthophotographies.

OBS

orthophotographie : Image photographique obtenue par redressement différentiel à partir d'un cliché aérien à peu près vertical représentant un terrain non plan.

Spanish

Save record 1

Record 2 2007-04-26

English

Subject field(s)
  • Remote Sensing
  • Computer Graphics
  • Audiovisual Techniques and Equipment
DEF

Modifying the geometry of an image(which may be from either a remotely sensed or map data source) [that] usually involves rectification and/or registration.

CONT

Overview of resampling methods. From the perspective of space, a satellite camera or sensor takes images that provide unique Earth information at scales ranging from very small to very large. To better understand an image, its shape, scale and perspective often are changed by rectification, orthorectification or map projection to relate it to real world coordinates. During that process, however, gaps between pixels may form, requiring that images be resampled to fill in those missing pixels. There are basically 3 methods of resampling : nearest neighbor, bilinear interpolation and cubic convolution.

OBS

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

French

Domaine(s)
  • Télédétection
  • Infographie
  • Audiovisuel (techniques et équipement)
CONT

Une fois déterminé le modèle mathématique permettant de passer d'un système de coordonnées à un autre, il faut encore calculer la valeur des pixels dans l'image redressée : c'est l'étape de rééchantillonnage. On a généralement le choix entre trois méthodes : [la] méthode du plus proche voisin (valeur de 1 pixel) [;] l'interpolation bilinéaire (valeur pondérée de 4 pixels) [;] la convolution cubique (valeur pondérée de 16 pixels).

OBS

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

Key term(s)
  • rééchantillonnage d'image

Spanish

Campo(s) temático(s)
  • Teledetección
  • Gráficos de computadora
  • Técnicas y equipo audiovisuales
Save record 2

Record 3 2007-02-01

English

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

A resampling method that uses the data file values of four pixels in a 2 by 2 window to calculate an output data file value by computing a weighted average of the input data file values with a bilinear function.

OBS

Depending upon the relation between the DEM [Digital Elevation Model] and radar resolutions, the interpolation method used to resample from map to radar image geometry can become important. Bilinear interpolation uses the appropriate weighting to distribute the contribution of the local illuminated area into four adjacent radar geometry pixels.

OBS

resampling : Modifying the geometry of an image(which may be from either a remotely sensed or map data source) [that] usually involves rectification and/or registration.

OBS

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

French

Domaine(s)
  • Télédétection
  • Infographie
OBS

L'interpolation bilinéaire consiste à utiliser les 4 points les plus proches des coordonnées calculées dans l'image source en les pondérant par des coefficients inversement proportionnels à la distance et dont la somme vaut 1.

OBS

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

Spanish

Campo(s) temático(s)
  • Teledetección
  • Gráficos de computadora
Save record 3

Record 4 2006-08-08

English

Subject field(s)
  • Remote Sensing
DEF

A process by which the geometry of an image area is made planimetric; it does not allow the removal of relief and perspective distortions.

CONT

Image rectification is applied to individual cell files, with the control points for the group used to control the rectification. The rectified cell files are placed into another database known as the target database. Rectification can be applied to any or all of the cell files associated with a group.

OBS

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

French

Domaine(s)
  • Télédétection
DEF

Application à une image de prétraitements destinés à en réduire, à un ordre défini, les aberrations géométriques, voire radiométriques.

OBS

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

Spanish

Save record 4

Record 5 2006-06-09

English

Subject field(s)
  • Remote Sensing
OBS

Cubic convolution determines the grey level from the weighted average of the 16 closest pixels to the specified input coordinates, and assigns that value to the output coordinates.

OBS

Resampling : Modifying the geometry of an image(which may be from either a remotely sensed or map data source) [that] usually involves rectification and/or registration.

OBS

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

French

Domaine(s)
  • Télédétection
OBS

La convolution cubique [...] consiste à assigner aux nouveaux pixels générés par la correction géométrique la valeur thématique basée sur une moyenne des 16 plus proches voisins pondérée en fonction de l'inverse de la distance.

OBS

rééchantillonnage : Modification de la géométrie de l'image qui consiste à calculer la valeur des pixels dans l'image redressée.

OBS

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

Spanish

Save record 5

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