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Proceedings Paper

Multi-wavelength imaging algorithm for optical interferometry
Author(s): Éric Thiébaut; Ferréol Soulez
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Paper Abstract

Optical interferometers provide multiple wavelength measurements. In order to fully exploit the spectral and spatial resolution of these instruments, new algorithms for image reconstruction have to be developed. Early attempts to deal with multi-chromatic interferometric data have consisted in recovering a gray image of the object or independent monochromatic images in some spectral bandwidths. The main challenge is now to recover the full 3-D (spatio-spectral) brightness distribution of the astronomical target given all the available data. We describe a new approach to implement multi-wavelength image reconstruction in the case where the observed scene is a collection of point-like sources. We show the gain in image quality (both spatially and spectrally) achieved by globally taking into account all the data instead of dealing with independent spectral slices. This is achieved thanks to a regularization which favors spatially sparsity and spectral grouping of the sources. Since the objective function is not dierentiable, we had to develop a specialized optimization algorithm which also takes into account the non-negativity of the brightness distribution.

Paper Details

Date Published: 12 September 2012
PDF: 11 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 84451C (12 September 2012); doi: 10.1117/12.926862
Show Author Affiliations
Éric Thiébaut, CRAL, Observatoire de Lyon, CNRS, Univ. Lyon 1, Ecole Normale Supèrieure de Lyon (France)
Ferréol Soulez, CRAL, Observatoire de Lyon, CNRS, Univ. Lyon 1, Ecole Normale Supèrieure de Lyon (France)

Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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