Topic
Pixelization
About: Pixelization is a research topic. Over the lifetime, 108 publications have been published within this topic receiving 6931 citations.
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TL;DR: This paper considers the requirements and implementation constraints on a framework that simultaneously enables an efficient discretization with associated hierarchical indexation and fast analysis/synthesis of functions defined on the sphere and demonstrates how these are explicitly satisfied by HEALPix.
Abstract: HEALPix the Hierarchical Equal Area isoLatitude Pixelization is a versatile structure for the pixelization of data on the sphere. An associated library of computational algorithms and visualization software supports fast scientific applications executable directly on discretized spherical maps generated from very large volumes of astronomical data. Originally developed to address the data processing and analysis needs of the present generation of cosmic microwave background experiments (e.g., BOOMERANG, WMAP), HEALPix can be expanded to meet many of the profound challenges that will arise in confrontation with the observational output of future missions and experiments, including, e.g., Planck, Herschel, SAFIR, and the Beyond Einstein inflation probe. In this paper we consider the requirements and implementation constraints on a framework that simultaneously enables an efficient discretization with associated hierarchical indexation and fast analysis/synthesis of functions defined on the sphere. We demonstrate how these are explicitly satisfied by HEALPix.
5,518 citations
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TL;DR: This research attacked the mode confusion problem by developing a parallel version of the “ Hubble Space Telescope” (“Hubble”) based on a model developed by accident at the Jet Propulsion Laboratory.
Abstract: 1 San Diego Supercomputer Center, University of California, San Diego, USA 2 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA 3 Max-Planck-Institute for Astrophysics, Garching, Germany 4 Institut d’Astrophysique de Paris, CNRS/Sorbonne Universite, Paris, France 5 Laboratoire Astroparticules et Cosmologie, CNRS/Université Paris Diderot, Paris, France 6 Goddard Space Flight Center, NASA, Greenbelt, Maryland, USA
467 citations
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TL;DR: This work develops a scheme based on a simple criterion taken from perturbation theory that is the only one that attains quadratic convergence with resolution for arbitrarily sloped interfaces and compares it with other published FDTD smoothing methods.
Abstract: Finite-difference time-domain (FDTD) methods suffer from reduced accuracy when modeling discontinuous dielectric materials, due to the inhererent discretization (pixelization). We show that accuracy can be significantly improved by using a subpixel smoothing of the dielectric function, but only if the smoothing scheme is properly designed. We develop such a scheme based on a simple criterion taken from perturbation theory and compare it with other published FDTD smoothing methods. In addition to consistently achieving the smallest errors, our scheme is the only one that attains quadratic convergence with resolution for arbitrarily sloped interfaces. Finally, we discuss additional difficulties that arise for sharp dielectric corners.
463 citations
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TL;DR: A new scheme of sky pixelization is developed for CMB maps based on the Gauss–Legendre polynomials zeros and allows one to create strict orthogonal expansion of the map.
Abstract: A new scheme of sky pixelization is developed for CMB maps. The scheme is based on the Gauss–Legendre polynomials zeros and allows one to create strict orthogonal expansion of the map. A corresponding code has been implemented and comparison with other methods has been done.
157 citations
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DSM1
21 May 2003-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The CdTe gamma-ray camera IBIS/ISGRI, on board the INTEGRAL satellite launched in October 2002, is currently the largest spectro-imager of this type in the world as discussed by the authors.
Abstract: The CdTe gamma-ray camera IBIS/ISGRI, on board the INTEGRAL satellite launched in October 2002, is currently the largest spectro-imager of this type in the world. The development of this detector, for research in the field of astrophysics, has provided the opportunity to demonstrate the feasibility of massive integration of CdTe nuclear detectors, taking advantage of the CdTe good spectral performances and high modularity. Many other groups in the world work also to further develop detectors using this material in view of improving its spectral performances (crystal quality, electrode geometry and type, electronics and filtering, etc.), the spatial resolution (pixelization of monolithic crystals) and the detection efficiency at high energy (thickness). In this review, I will detail the main directions in which to strive in order to explore these fields in the upcoming years through examples of techniques or applications.
129 citations