218 articles – 617 Notices  [english version]
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PSIP'2005 : Physics in signal and Image processing, Toulouse : France (2005)
Independent Component Separation from incomplete spherical data using wavelets. Application to CMB data analysis
Y. Moudden1, P. Abrial1, P. Vielva2, J.-B. Melin2, J.-L. Starck1, J.-F. Cardoso3, J. Delabrouille2, M.K. Nguyen4

Spectral matching ICA (SMICA) is a source separation method based on covariance matching in Fourier space that was designed to address in a flexible way some of the general problems raised by Cosmic Microwave Background data analysis. However, a common issue in astronomical data analysis is that the observations are unevenly sampled or incomplete maps with missing patches or intentionally masked parts. In addition, many astrophysical emissions are not well modeled as stationary processes over the sky. These effects impair data processing techniques in the spherical harmonics representation. This paper describes a new wavelet transform for spherical maps and proposes an extension of SMICA in this space-scale representation.
1 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
2 :  PCC - Physique Corpusculaire et Cosmologie - Collège de France
3 :  LTCI - Laboratoire Traitement et Communication de l'Information [Paris]
4 :  ETIS - Equipe traitement des images et du signal
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique
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