Data Inversion for Over-Resolved Spectral Imaging in Astronomy - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue IEEE Journal of Selected Topics in Signal Processing Année : 2008

Data Inversion for Over-Resolved Spectral Imaging in Astronomy

Résumé

We present an original method for reconstructing a 3-D object having two spatial dimensions and one spectral dimension from data provided by the infrared slit spectrograph on board the Spitzer Space Telescope. During acquisition, the light flux is deformed by a complex process comprising four main elements (the telescope aperture, the slit, the diffraction grating, and optical distortion) before it reaches the 2-D sensor. The originality of this work lies in the physical modeling, in integral form, of this process of data formation in continuous variables. The inversion is also approached with continuous variable in a semi-parametric format decomposing the object into a family of Gaussian functions. The estimate is built in a deterministic regularization framework as the minimizer of a quadratic criterion. These specificities give our method the power to over-resolve. It performance is illustrated using real and simulated data. We also present a study of the resolution showing a 1.5-fold improvement relative to conventional methods.
Fichier principal
Vignette du fichier
JSTSP08.pdf (2.08 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-00411775 , version 1 (28-08-2009)

Identifiants

  • HAL Id : hal-00411775 , version 1

Citer

Thomas Rodet, François Orieux, Jean-François Giovannelli, Alain Abergel. Data Inversion for Over-Resolved Spectral Imaging in Astronomy. IEEE Journal of Selected Topics in Signal Processing, 2008, 2 (5), pp. 802-811. ⟨hal-00411775⟩
274 Consultations
135 Téléchargements

Partager

Gmail Facebook X LinkedIn More