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GAMMA MAP FILTER [1 record]
Record 1 - internal organization data 2006-06-01
Record 1, English
Record 1, Subject field(s)
- Remote Sensing
Record 1, Main entry term, English
- gamma filter
1, record 1, English, gamma%20filter
correct, officially approved
Record 1, Abbreviations, English
Record 1, Synonyms, English
- gamma MAP filter 2, record 1, English, gamma%20MAP%20filter
correct, see observation
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
[A filter used] to remove random noise while preserving high frequency features (edges). 3, record 1, English, - gamma%20filter
Record number: 1, 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 1, English, - gamma%20filter
Record number: 1, 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 1, English, - gamma%20filter
Record number: 1, Textual support number: 1 OBS
The term MAP stands for Maximum A Posteriori. 5, record 1, English, - gamma%20filter
Record number: 1, Textual support number: 2 OBS
gamma filter: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG). 5, record 1, English, - gamma%20filter
Record number: 1, Textual support number: 1 PHR
Gamma-gaussian, gamma-beta, gamma-gamma MAP filter. 5, record 1, English, - gamma%20filter
Record 1, French
Record 1, Domaine(s)
- Télédétection
Record 1, Main entry term, French
- filtre gamma
1, record 1, French, filtre%20gamma
correct, masculine noun, officially approved
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, 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 1, French, - filtre%20gamma
Record number: 1, Textual support number: 1 OBS
Pour le lissage et le déchatoiement des images, ce filtre surclasse tous les autres filtres. 2, record 1, French, - filtre%20gamma
Record number: 1, Textual support number: 2 OBS
filtre gamma : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR). 2, record 1, French, - filtre%20gamma
Record 1, Spanish
Record 1, Textual support, Spanish
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