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LEE FILTER [5 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2007-01-31

English

Subject field(s)
  • Remote Sensing
DEF

A digital filter that performs digital signal processing, and is able to adapt its performance to optimally suit the input signal.

CONT

An adaptive filter uses a filtering window that runs over the entire image pixel-by-pixel, generating new (filtered) values of the pixels. As the name suggests, an adaptive filter can adapt to the varying nature of an image by adjusting the coefficients of the filtering window depending upon the local variance in the intensity values of pixels.

OBS

Adaptive filters mainly include the Kuan filter, the LEE filter, the Frost filter and the Gamma MAP filter.

OBS

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

French

Domaine(s)
  • Télédétection
DEF

Filtre numérique dont les coefficients, estimés au sens d'un critère donné, s'adaptent aux variations des signaux reçus.

CONT

Le filtre adaptatif consiste à ajuster la puissance du filtre en fonction des critères des statistiques locales de l'image. Ce filtre peut être utilisé lorsque le rapport signal sur bruit est faible. Ce type de filtre réduit le bruit en conservant le maximum de détails dans l'image.

OBS

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

Spanish

Campo(s) temático(s)
  • Teledetección
Save record 1

Record 2 2006-06-01

English

Subject field(s)
  • Remote Sensing
CONT

Enhanced LEE filter was modified by Lopes. He proposed to divide an image into areas of three classes. The first class corresponds to the homogeneous areas in which the speckles may be eliminated simply by applying an LP filter(or equivalently, averaging, multi-look processing). The second class corresponds to the heterogeneous areas in which the speckles are to be reduced while preserving texture and the third class [refers to] areas containing isolated point targets... In this case, the filter should preserve the observed value.

CONT

[A] good filter should maintain edges and texture in [the] original image. [Therefore, as compared to the initial image], the filtered image should be more contrasted.

OBS

LEE stands for Lee Edge Enhancement.

OBS

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

French

Domaine(s)
  • Télédétection
OBS

Ce filtre permet de réduire le chatoiement tout en conservant les bordures et la texture de l'image d'origine; ainsi, l'image finale devait être plus contrastée que l'image initiale.

OBS

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

Spanish

Save record 2

Record 3 2006-01-17

English

Subject field(s)
  • Remote Sensing
CONT

The Kuan filter smoothes the speckle in the image data without removing [image] edges or sharp features.

CONT

The Kuan filter is similar to the LEE filtre but makes fewer simplifying assumptions in the calculations.

OBS

Adaptive filters mainly include the Kuan filter, the LEE filter, the Frost filter and the gamma MAP filter.

OBS

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

French

Domaine(s)
  • Télédétection
CONT

Le filtre de Kuan [...] est semblable au filtre de LEE mais les estimateurs de variance locaux (weighting function) sont différents. Puisque le filtre de Kuan n'applique pas d'approximation au modèle original, il peut être considéré supérieur au filtre de LEE.

OBS

Le filtre de Kuan appartient à la famille des filtres adaptatifs.

OBS

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

Spanish

Save record 3

Record 4 2002-03-21

English

Subject field(s)
  • Remote Sensing
CONT

The LEE filter(Laplacian Egde Enhancement filter) is useful in detecting edge and linear features [contrasts] in imagery.

OBS

Adaptive filters mainly include the Kuan filter, the LEE filter, the Frost filter and the Gamma MAP filter.

OBS

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

French

Domaine(s)
  • Télédétection
OBS

Le filtre de LEE sert au lissage des données-images tout en préservant les contours et les contrastes d'image.

OBS

Le filtre de Kuan appartient à la famille des filtres adaptatifs.

OBS

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

Spanish

Save record 4

Record 5 2002-03-15

English

Subject field(s)
  • Remote Sensing
CONT

[The] Frost filter allows [the reduction of] speckle while preserving edges in a radar image. This filter is intermediate between LEE filter and median filter.

CONT

The Frost filter differs from the LEE and Kuan filters [in such a manner] that the scene reflectivity is estimated by convolving the observed image with the impulse response of the SAR system.

OBS

Adaptive filters mainly include the Kuan filter, the LEE filter, the Frost filter and the Gamma MAP filter.

OBS

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

French

Domaine(s)
  • Télédétection
CONT

En imagerie radar, le filtre de Frost sert à atténuer le chatoiement de l'image tout en préservant les contours. Ce filtre [est considéré comme] un filtre intermédiaire entre le filtre de LEE et le filtre médian.

OBS

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

Spanish

Save record 5

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