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- R. Vio, J. Nagy, Luis Tenorio, Willem Wamsteker
- 2003

We consider the simultaneous deblurring of a set of noisy images whose point spread functions are different but known and spatially invariant, and the noise is Gaussian. Currently available iterativeâ€¦ (More)

- R. Vio, Luis Tenorio, Willem Wamsteker
- 2002

Point-source contamination in high-precision Cosmic Microwave Background (CMB) maps severely affects the precision of cosmological parameter estimates. Among the methods that have been proposed forâ€¦ (More)

We report on observations of redshifted He ii 303.8 Ã… absorption in the high-redshift QSO HE 2347âˆ’4342 (z = 2.885, V = 16.1) with the Goddard High Resolution Spectrograph on board HST in its lowâ€¦ (More)

- R. Vio, John Bardsley, Willem Wamsteker
- 2004

It is well-known that the noise associated with the collection of an astronomical image by a CCD camera is, in large part, Poissonian. One would expect, therefore, that computational approaches thatâ€¦ (More)

- R. Vio, John Bardsley, Marco Donatelli, Willem Wamsteker
- 2005

It is well-known that when an astronomical image is collected by a telescope, the measured intensities at pixels near the edge of the image may depend on the intensity of the object outside of theâ€¦ (More)

- R. Vio, James G. Nagy, Willem Wamsteker
- 2005

We generalize a reliable and efficient algorithm, to deal with the case of spatially-variant PSFs. The algorithm was developed in the context of a least-square (LS) approach, to estimate the imageâ€¦ (More)

- R. Vio, Pengfei Ma, Weizhi Zhong, James G. Nagy, Luis Tenorio, Willem Wamsteker
- 2004

We consider the estimation of the regularization parameter for the simultaneous deblurring of multiple noisy images via Tikhonov regularization. We approach the problem in three ways. We first reduceâ€¦ (More)

- R. Vio, P. Andreani, Willem Wamsteker
- 2003

In this draft we comment on the results concerning the performances of matched filters, scale adaptive filters and Mexican hat wavelet that recently appeared in literature in the context of pointâ€¦ (More)

- Martin A. Barstow, Luc Binette, +19 authors Florek S
- 2002

The World Space Observatory is an unconventional space project proceeding via distributed studies. The present design, verified for feasibilty, consists of a 1.7-meter telescope operating at theâ€¦ (More)

- R. Vio, James G. Nagy, Luis Tenorio, P. Andreani, Carlo Baccigalupi, Willem Wamsteker
- 2003

In this second paper in a series dedicated to developing efficient numerical techniques for the deblurring Cosmic Microwave Background (CMB) maps, we consider the case of asymmetric point spreadâ€¦ (More)