TERMIUM Plus®
The Government of Canada’s terminology and linguistic data bank.
SPECKLE NOISE [6 records]
Record 1 - internal organization data 2020-12-04
Record 1, English
Record 1, Subject field(s)
- Optics
- Computer Graphics
- Photography
Record 1, Main entry term, English
- coherent holography
1, record 1, English, coherent%20holography
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
Coherent holography records the complex amplitude of a 3D object holographically, giving speckle noise upon reconstruction and presenting a serious drawback inherent in coherent optical systems. 2, record 1, English, - coherent%20holography
Record 1, French
Record 1, Domaine(s)
- Optique
- Infographie
- Photographie
Record 1, Main entry term, French
- holographie cohérente
1, record 1, French, holographie%20coh%C3%A9rente
proposal, feminine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 2012-01-09
Record 2, English
Record 2, Subject field(s)
- Range Measurements (Telecommunications)
- Radar, Radio Guidance and Goniometry
Record 2, Main entry term, English
- optical correlator
1, record 2, English, optical%20correlator
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record number: 2, Textual support number: 1 DEF
A device that measures the coherence between two wave systems to detect weak signals lost in noise. 2, record 2, English, - optical%20correlator
Record number: 2, Textual support number: 1 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. 3, record 2, English, - optical%20correlator
Record 2, French
Record 2, Domaine(s)
- Mesures à distance (Télécommunications)
- Radar, radioguidage et radiogoniométrie
Record 2, Main entry term, French
- corrélateur optique
1, record 2, French, corr%C3%A9lateur%20optique
masculine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
Record 2, Textual support, French
Record number: 2, Textual support number: 1 DEF
Dispositif mesurant la cohérence entre deux systèmes d'onde afin de détecter les signaux faibles plus ou moins perdus dans le bruit. 2, record 2, French, - corr%C3%A9lateur%20optique
Record number: 2, Textual support number: 1 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. 3, record 2, French, - corr%C3%A9lateur%20optique
Record 2, Spanish
Record 2, Campo(s) temático(s)
- Medidas de distancia (Telecomunicaciones)
- Guía radárica, radioguía y radiogoniometría
Record 2, Main entry term, Spanish
- correlador óptico
1, record 2, Spanish, correlador%20%C3%B3ptico
correct, masculine noun
Record 2, Abbreviations, Spanish
Record 2, Synonyms, Spanish
Record 2, Textual support, Spanish
Record number: 2, Textual support number: 1 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. 1, record 2, Spanish, - correlador%20%C3%B3ptico
Record 3 - internal organization data 2007-04-26
Record 3, English
Record 3, Subject field(s)
- Radar, Radio Guidance and Goniometry
- Spacecraft
- Remote Sensing
Record 3, Main entry term, English
- multilook
1, record 3, English, multilook
correct, officially approved
Record 3, Abbreviations, English
Record 3, Synonyms, English
- multi-look 2, record 3, English, multi%2Dlook
correct
Record 3, Textual support, English
Record number: 3, Textual support number: 1 DEF
An imaging radar data processing mode used to reduce speckle by image superposition of a same scene. 3, record 3, English, - multilook
Record number: 3, Textual support number: 1 OBS
The multilook process reduces the noise and results in less speckle on the image. There is, however, an increase in coarseness of the spatial resolution. 4, record 3, English, - multilook
Record number: 3, Textual support number: 2 OBS
multilook: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG). 3, record 3, English, - multilook
Record number: 3, Textual support number: 1 PHR
Multilook parameter, SAR image. 3, record 3, English, - multilook
Record 3, Key term(s)
- multi look
Record 3, French
Record 3, Domaine(s)
- Radar, radioguidage et radiogoniométrie
- Engins spatiaux
- Télédétection
Record 3, Main entry term, French
- multivisée
1, record 3, French, multivis%C3%A9e
correct, feminine noun, officially approved
Record 3, Abbreviations, French
Record 3, Synonyms, French
Record 3, Textual support, French
Record number: 3, Textual support number: 1 DEF
Mode de traitement des données d'un radar imageur permettant de réduire le chatoiement par la superposition d'images d'une même scène. 2, record 3, French, - multivis%C3%A9e
Record number: 3, Textual support number: 1 OBS
Dans un radar à synthèse d'ouverture, la multivisée réduit le chatoiement au détriment de la résolution géométrique appelée aussi «résolution spatiale». 2, record 3, French, - multivis%C3%A9e
Record number: 3, Textual support number: 2 OBS
multivisée : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR). 3, record 3, French, - multivis%C3%A9e
Record 3, Key term(s)
- multi-visée
Record 3, Spanish
Record 3, Campo(s) temático(s)
- Guía radárica, radioguía y radiogoniometría
- Naves espaciales
- Teledetección
Record 3, Main entry term, Spanish
- multivista
1, record 3, Spanish, multivista
correct, feminine noun
Record 3, Abbreviations, Spanish
Record 3, Synonyms, Spanish
- visualización multiple 2, record 3, Spanish, visualizaci%C3%B3n%20multiple
feminine noun
Record 3, Textual support, Spanish
Record 4 - internal organization data 2006-06-01
Record 4, English
Record 4, Subject field(s)
- Remote Sensing
Record 4, Main entry term, English
- gamma filter
1, record 4, English, gamma%20filter
correct, officially approved
Record 4, Abbreviations, English
Record 4, Synonyms, English
- gamma MAP filter 2, record 4, English, gamma%20MAP%20filter
correct, see observation
Record 4, Textual support, English
Record number: 4, Textual support number: 1 DEF
[A filter used] to remove random noise while preserving high frequency features (edges). 3, record 4, English, - gamma%20filter
Record number: 4, Textual support number: 1 CONT
The Gamma filter performs gamma map filtering. Gamma filtering is primarily used on radar data to remove high frequency noise(speckle) while preserving high frequency features(edges). The Gamma Map filter was first proposed by Kuan.... Lopes modified the Kuan Map filter by assuming a gamma distributed scene and setting up two thresholds. The gamma filter size ranges from 1 to 11. Different filter sizes will greatly affect the quality of processed images. If the filter is too small, the noise filtering algorithm is not effective. If the filter is too large, subtle details of the image will be lost in the filtering process. A 7x7 filter usually gives the best results.... The GAMMA filter performs spatial filtering on each individual pixel in an image using the grey level values in a square window surrounding each pixel. The dimensions of the filter must be odd, and can be from 3x3 to 11x11 pixels. 2, record 4, English, - gamma%20filter
Record number: 4, Textual support number: 2 CONT
Gamma Filter yields the best smoothing and despeckling. Moreover, it seems to keep the edges without blurring the minimum. Eight textures are applied, based on the cooccurrence matrix. These textures include mean, variance, homogeneity, contrast, dissimilarity, entropy, second moment, and correlation. 4, record 4, English, - gamma%20filter
Record number: 4, Textual support number: 1 OBS
The term MAP stands for Maximum A Posteriori. 5, record 4, English, - gamma%20filter
Record number: 4, Textual support number: 2 OBS
gamma filter: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG). 5, record 4, English, - gamma%20filter
Record number: 4, Textual support number: 1 PHR
Gamma-gaussian, gamma-beta, gamma-gamma MAP filter. 5, record 4, English, - gamma%20filter
Record 4, French
Record 4, Domaine(s)
- Télédétection
Record 4, Main entry term, French
- filtre gamma
1, record 4, French, filtre%20gamma
correct, masculine noun, officially approved
Record 4, Abbreviations, French
Record 4, Synonyms, French
Record 4, Textual support, French
Record number: 4, Textual support number: 1 DEF
Filtre utilisé pour enlever les bruits aléatoires des images, tout en préservant les caractéristiques les plus pertinentes (bordures). 2, record 4, French, - filtre%20gamma
Record number: 4, Textual support number: 1 OBS
Pour le lissage et le déchatoiement des images, ce filtre surclasse tous les autres filtres. 2, record 4, French, - filtre%20gamma
Record number: 4, Textual support number: 2 OBS
filtre gamma : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR). 2, record 4, French, - filtre%20gamma
Record 4, Spanish
Record 4, Textual support, Spanish
Record 5 - internal organization data 2006-06-01
Record 5, English
Record 5, Subject field(s)
- Remote Sensing
Record 5, Main entry term, English
- despeckling filter
1, record 5, English, despeckling%20filter
correct, officially approved
Record 5, Abbreviations, English
Record 5, Synonyms, English
- speckle filter 1, record 5, English, speckle%20filter
correct
Record 5, Textual support, English
Record number: 5, Textual support number: 1 DEF
A filter designed to eliminate speckle in an image. 2, record 5, English, - despeckling%20filter
Record number: 5, Textual support number: 1 OBS
speckle : The noise that is created by constructive and destructive interference between the backscattered energy from different portions of the ground surface included in the same pixel of the image the SAR image appears to be covered by randomly scattered bright and dark spots. 3, record 5, English, - despeckling%20filter
Record number: 5, Textual support number: 2 OBS
despeckling filter: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG). 2, record 5, English, - despeckling%20filter
Record 5, French
Record 5, Domaine(s)
- Télédétection
Record 5, Main entry term, French
- filtre de déchatoiement
1, record 5, French, filtre%20de%20d%C3%A9chatoiement
correct, masculine noun, officially approved
Record 5, Abbreviations, French
Record 5, Synonyms, French
Record 5, Textual support, French
Record number: 5, Textual support number: 1 DEF
Filtre destiné à éliminer le chatoiement d'une image. 2, record 5, French, - filtre%20de%20d%C3%A9chatoiement
Record number: 5, Textual support number: 1 OBS
chatoiement : Ensemble de petites taches rapidement fluctuantes qui apparaissent dans la texturation instantanée d'une image et dû, soit à l'observation à l'aide d'un faisceau cohérent d'une cible présentant des irrégularités à l'échelle de la longueur d'onde, soit à la propagation d'un faisceau cohérent dans une atmosphère caractérisée par des variations aléatoires d'indice de réfraction. 3, record 5, French, - filtre%20de%20d%C3%A9chatoiement
Record number: 5, Textual support number: 2 OBS
filtre de déchatoiement : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR). 4, record 5, French, - filtre%20de%20d%C3%A9chatoiement
Record 5, Spanish
Record 5, Textual support, Spanish
Record 6 - internal organization data 2005-04-25
Record 6, English
Record 6, Subject field(s)
- Remote Sensing
Record 6, Main entry term, English
- median filtering
1, record 6, English, median%20filtering
correct, officially approved
Record 6, Abbreviations, English
Record 6, Synonyms, English
Record 6, Textual support, English
Record number: 6, Textual support number: 1 CONT
Median filtering smooths a [radar] image, while preserving edges larger than the kernel dimensions(good for removing salt and pepper noise or speckle). 2, record 6, English, - median%20filtering
Record number: 6, Textual support number: 1 OBS
median filtering: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG). 3, record 6, English, - median%20filtering
Record 6, French
Record 6, Domaine(s)
- Télédétection
Record 6, Main entry term, French
- filtrage médian
1, record 6, French, filtrage%20m%C3%A9dian
correct, masculine noun, officially approved
Record 6, Abbreviations, French
Record 6, Synonyms, French
Record 6, Textual support, French
Record number: 6, Textual support number: 1 CONT
[...] le filtrage médian est particulièrement efficace pour réduire le chatoiement dans les images radar. Il s'agit d'un filtre «passe-bas» qui, en ne retenant que les basses fréquences spatiales, diminue le bruit mais supprime aussi des détails. 2, record 6, French, - filtrage%20m%C3%A9dian
Record number: 6, Textual support number: 1 OBS
filtrage médian : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR). 3, record 6, French, - filtrage%20m%C3%A9dian
Record 6, Spanish
Record 6, Textual support, Spanish
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