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Restauration d'objets astrophysiques à partir de données multispectrales floues et d'une réponse instrument non-stationnaire

Abstract : In this paper we deal with the restoration of astrophysical objects from multispectral data acquired by an imager on board of a space telescope. The problems we address are the spatial resolution limitation caused by the spectral varying optical response and the broadband spectral integration of the object. Indeed, we develop an instrument model that takes into account these effects, and we propose a direct model by exploiting all the data from different spectral band jointly. The restoration of the object is implemented using the regularized least squares method, and the solution is computed by the conjugate gradient algorithm. We test our approach on simulated imagery data from the Mid-InfraRed Instrument (MIRI) on board the future James Webb Space Telescope (JWST). Our method shows a significant increase in spatial and spectral resolution compared to conventional methods.
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https://hal.archives-ouvertes.fr/hal-01596257
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Submitted on : Thursday, March 5, 2020 - 11:03:48 AM
Last modification on : Wednesday, November 3, 2021 - 9:21:58 AM
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  • HAL Id : hal-01596257, version 1

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Mohamed Amine Hadj-Youcef, François Orieux, Aurélia Fraysse, Alain Abergel. Restauration d'objets astrophysiques à partir de données multispectrales floues et d'une réponse instrument non-stationnaire. 26eme Colloque GRETSI Traitement du Signal & des Images, GRETSI 2017, Sep 2017, Juan Les Pins, France. ⟨hal-01596257⟩

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