Restoration of interferometric images

Carbillet, Marcel; Correia, Serge; Boccacci, Patrizia; Bertero, M.

doi:10.1051/0004-6361:20020389

Cited by 31 publications

(16 citation statements)

References 16 publications

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“…In previous papers (Bertero & Boccacci 2000;Correia et al 2002;Carbillet et al 2002;Anconelli et al 2005), we developed methods and software for the deconvolution of multiple interferometric images of the same astronomical target. One of the results is the software package AIRY (Astronomical Image Restoration in interferometrY), and version 3.0 is now available (see http://dirac.disi.unige.it and http://www-luan.unice.fr/caos).…”

Section: Introductionmentioning

confidence: 99%

Advances in the reconstruction of LBT LINC-NIRVANA images

Camera¹,

Desiderà²,

Arcidiacono

et al. 2007

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Context. LINC-NIRVANA, the Fizeau interferometer of the Large Binocular Telescope (LBT), will require routine use of image reconstruction methods for data reduction. To this purpose our group has already developed the software package AIRY (Astronomical Image Restoration in interferometrY). Aims. Observations of a target, with different orientations of the baseline of LINC-NIRVANA, will provide images with different orientations with respect to the CCD camera. This rotation effect was not taken into account in our previous work. Therefore in this paper we propose a method able to compensate for the rotation of the field of view. Moreover we investigate acceleration techniques for reducing the computational burden of multiple image deconvolution. Methods. The basic method is a suitable modification of the Richardson-Lucy algorithm, also implementing an approach we proposed for reducing boundary effects. Acceleration techniques, proposed by Biggs & Andrews, are extended and applied to this new algorithm. Finally a method for estimating the unknown point spread function (PSF) by extracting and extrapolating the image of a reference star is developed and implemented. Results. The method introduced for compensating object rotation and reducing boundary effects, as well as its accelerated versions, are tested on simulated LINC-NIRVANA images, using the VLT image of the Crab Nebula as test object. The results are very promising. Moreover the method for PSFs extraction is tested on simulated images, derived from the LBT image of the galaxy NGC 6946 and obtained by convolving this image with PSFs computed by means of the numerical code LOST (Layer Oriented Simulation Tool).

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Section: Introductionmentioning

confidence: 99%

Advances in the reconstruction of LBT LINC-NIRVANA images

Camera¹,

Desiderà²,

Arcidiacono

et al. 2007

A&A

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“…In previous papers (Bertero & Boccacci 2000a,b;Correia et al 2002;Carbillet et al 2002;Anconelli et al 2005a) we developed methods and software for the deconvolution of multiple interferometric images of the same astronomical target. Moreover, our group has produced the software package AIRY (see http://dirac.disi.unige.it), which can be used in conjunction with the software package CAOS (Code for Adaptive Optics Systems; Carbillet et al 2005), within the common CAOS "problem solving environment" (see http://www.arcetri.astro.it/caos or http://www-astro.unice.fr/caos).…”

Section: Introductionmentioning

confidence: 99%

Application of iterative blind deconvolution to the reconstruction of LBT LINC-NIRVANA images

Desiderà¹,

Anconelli²,

Bertero³

et al. 2006

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Context. The paper is about methods for multiple image deconvolution and their application to the reconstruction of the images acquired by the Fizeau interferometer, denoted LINC-NIRVANA, under development for the Large Binocular Telescope (LBT). The multiple images of the same target are obtained with different orientations of the baseline. Aims. To propose and develop a blind method for dealing with cases where no knowledge or very poor knowledge of the point spread functions (PSF) is available. Methods. The approach is an iterative one where object and PSFs are alternately updated using deconvolution methods related to the standard Richardson-Lucy method. It is basically an extension, to the multiple image case, of iterative blind deconvolution methods proposed in the case of a single image. Results. The method is applied to simulated LBT LINC-NIRVANA images and its limitations are investigated. The algorithm has been implemented in the module BLI of the software package AIRY (Astronomical Image Reconstruction in interferometrY), available under request. The preliminary results we have obtained are promising but an extensive simulation program is still necessary for a full understanding of the applicability of the method in the practice of the reconstruction of LINC-NIRVANA images.

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“…In previous papers (Bertero & Boccacci 2000a,b;Correia et al 2002;Carbillet et al 2002;Anconelli et al 2005) we developed methods and software for the deconvolution of multiple interferometric images of the same astronomical target. One of the results is the software package AIRY (Astronomical Image Reconstruction in interferometrY) of which version 3.0 is now available (see http://dirac.disi.unige.it and http://www-luan.unice.fr/caos).…”

Section: Introductionmentioning

confidence: 99%

“…1. It is a model of young binary star surrounded by a dusty circumbinary ring, described in Carbillet et al (2002). It is directly inspired by nearinfrared observations of the T-Tauri binary star of the quadruple system GG Tau and subsequent modeling by Wood et al (1999).…”

Section: Introductionmentioning

confidence: 99%

Deconvolution of multiple images with high dynamic range and an application to LBT LINC-NIRVANA

Anconelli¹,

Bertero²,

Boccacci³

et al. 2006

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Context. The standard Richardson-Lucy method (RLM) does not work well in the deconvolution of astronomical images containing objects with very different angular scales and magnitudes. Therefore, modifications of RLM, applicable to this kind of objects, must be investigated. Aims. We recently proposed a regularization of RLM which provides satisfactory results in the case of particular test objects with high dynamic range. In this paper we extend this method to the case of multiple image deconvolution, having in mind application to the reconstruction of the images provided by Fizeau interferometers such as LINC-NIRVANA, the German-Italian beam combiner for the Large Binocular Telescope. Methods. RLM is an iterative method for the minimization of the Csiszár divergence, a problem equivalent to maximum likelihood estimation in the case of photon noise. In our approach, the problem is regularized by adding a suitable penalization term to the Csiszár divergence and an iterative method converging to the minimum of the resulting functional is derived from the so-called split gradient method (SGM).Results. The method is tested on a model of young binary star consisting of a core binary surrounded by a dusty circumbinary ring. The results are quite good in the case of exact knowledge of the point spread functions (PSF). However, in the case of approximate knowledge of the PSFs, the accuracy of the reconstruction depends on the difference of magnitude between the ring and the central binary.

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Restoration of interferometric images

Cited by 31 publications

References 16 publications

Advances in the reconstruction of LBT LINC-NIRVANA images

Advances in the reconstruction of LBT LINC-NIRVANA images

Application of iterative blind deconvolution to the reconstruction of LBT LINC-NIRVANA images

Deconvolution of multiple images with high dynamic range and an application to LBT LINC-NIRVANA

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