This book presents an in-depth look at lenses free of spherical aberrations and is provided
using illustrative examples. Mathematical principles behind lenses free of spherical …

We study the Short-and-Sparse (SaS) deconvolution problem of recovering a short signal a0
and a sparse signal x0 from their convolution. We propose a method based on nonconvex …

Long-range optical imaging applications are typically hindered by atmospheric turbulence.
The effect of turbulence on an imaging system can manifest itself as an image blur effect …

This book deals with the fundamentals of stellar interferometry with emphasis on aperture
synthesis using sparse array of telescopes particularly at optical/IR wavelengths, the origin …

The impulsive noise in astronomical images originates from various sources. It develops as
a result of thermal generation in pixels or the collision of cosmic rays with an image sensor …

In this paper, we present a novel approach to the estimation of strongly varying backgrounds
in astronomical images by means of small-objects removal and subsequent missing pixels …

A new high-resolution radio spectropolarimeter instrument operating in the frequency range
of 15–85 MHz has recently been commissioned at the Radio Astronomy Field Station of the …

Solar hydrogen line emission has been observed at the frequency of 1.42 GHz (21 cm
wavelength) with 3 m radio telescope installed inside the University of Baghdad campus …

Observations of the solar photosphere from the ground encounter significant problems
caused by Earth's turbulent atmosphere. Before image reconstruction techniques can be …

Imaging through turbulence has been the subject of many research papers in a variety of
fields, including defence, astronomy, earth observations, and medicine. The main goal of …