Zobrazeno 1 - 10
of 78
pro vyhledávání: '"Simeoni, Matthieu"'
Autor:
Jarret, Adrian, Kashani, Sepand, Rué-Queralt, Joan, Hurley, Paul, Fageot, Julien, Simeoni, Matthieu
Aims: We address two issues for the adoption of convex optimization in radio interferometric imaging. First, a method for a fine resolution setup is proposed which scales naturally in terms of memory usage and reconstruction speed. Second, a new tool
Externí odkaz:
http://arxiv.org/abs/2406.01342
Autor:
Tolley, Emma, Frasch, Simon, Orliac, Etienne, Krishna, Shreyam, Bianco, Michele, Kashani, Sepand, Hurley, Paul, Simeoni, Matthieu, Kneib, Jean-Paul
The Bluebild algorithm is a new technique for image synthesis in radio astronomy which forms a least-squares estimate of the sky intensity function using the theory of sampling and interpolation operators. We present an HPC implementation of the Blue
Externí odkaz:
http://arxiv.org/abs/2310.09200
Analysis and synthesis are key steps of the radio-interferometric imaging process, serving as a bridge between visibility and sky domains. They can be expressed as partial Fourier transforms involving a large number of non-uniform frequencies and sph
Externí odkaz:
http://arxiv.org/abs/2306.06007
Lensless imaging can provide visual privacy due to the highly multiplexed characteristic of its measurements. However, this alone is a weak form of security, as various adversarial attacks can be designed to invert the one-to-many scene mapping of su
Externí odkaz:
http://arxiv.org/abs/2211.12864
By replacing the lens with a thin optical element, lensless imaging enables new applications and solutions beyond those supported by traditional camera design and post-processing, e.g. compact and lightweight form factors and visual privacy. The latt
Externí odkaz:
http://arxiv.org/abs/2206.01429
Lensless imaging seeks to replace/remove the lens in a conventional imaging system. The earliest cameras were in fact lensless, relying on long exposure times to form images on the other end of a small aperture in a darkened room/container (camera ob
Externí odkaz:
http://arxiv.org/abs/2206.01430
Nous nous int\'eressons \`a la reconstruction parcimonieuse d'images \`a l'aide du probl\`eme d'optimisation r\'egularis\'e LASSO. Dans de nombreuses applications pratiques, les grandes dimensions des objets \`a reconstruire limitent, voire emp\^eche
Externí odkaz:
http://arxiv.org/abs/2204.13557
We propose nonparametric estimators for the second-order central moments of possibly anisotropic spherical random fields, within a functional data analysis context. We consider a measurement framework where each random field among an identically dist
Externí odkaz:
http://arxiv.org/abs/2112.12694
We propose a fast and scalable Polyatomic Frank-Wolfe (P-FW) algorithm for the resolution of high-dimensional LASSO regression problems. The latter improves upon traditional Frank-Wolfe methods by considering generalized greedy steps with polyatomic
Externí odkaz:
http://arxiv.org/abs/2112.02890
Fourier transforms are an often necessary component in many computational tasks, and can be computed efficiently through the fast Fourier transform (FFT) algorithm. However, many applications involve an underlying continuous signal, and a more natura
Externí odkaz:
http://arxiv.org/abs/2110.00262