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This paper presents a novel method for ground segmentation in Velodyne point clouds. We propose an encoding of sparse 3D data from the Velodyne sensor suitable for training a convolutional neural network (CNN). This general purpose approach…

Robotics · Computer Science 2017-09-08 Martin Velas , Michal Spanel , Michal Hradis , Adam Herout

Solar spectropolarimetric inversion -- inferring atmospheric conditions from the Stokes vector -- is a key diagnostic tool for understanding solar magnetism, but traditional inversion methods are computationally expensive and sensitive to…

Solar and Stellar Astrophysics · Physics 2025-11-17 Ryan James Campbell , Mihalis Mathioudakis , Carlos Quintero Noda

Recently, outstanding identification rates in image classification tasks were achieved by convolutional neural networks (CNNs). to use such skills, selective CNNs trained on a dataset of well-known images of metal surface defects captured…

Computer Vision and Pattern Recognition · Computer Science 2024-06-24 Nadeem Jabbar Chaudhry , M. Bilal Khan , M. Javaid Iqbal , Siddiqui Muhammad Yasir

Machine learning models have been employed to perform either physics-free data-driven or hybrid dynamical downscaling of climate data. Most of these implementations operate over relatively small downscaling factors because of the challenge…

Atmospheric and Oceanic Physics · Physics 2023-02-24 Daniel Getter , Julie Bessac , Johann Rudi , Yan Feng

In a previous paper, we argued that the inversion of Stokes profiles applied to spectropolarimetric observations of the solar internetwork yield unrealistically large values of the inclination of the magnetic field vector ($\gamma$). This…

Solar and Stellar Astrophysics · Physics 2015-06-11 J. M. Borrero , P. Kobel

In this work, we study the information content learned by a convolutional neural network (CNN) when trained to carry out the inverse mapping between a database of synthetic Ca II intensity spectra and the vertical stratification of the…

Instrumentation and Methods for Astrophysics · Physics 2022-02-09 Rebecca Centeno , Natasha Flyer , Lipi Mukherjee , Ricky Egeland , Roberto Casini , Tanausu del Pino Aleman , Matthias Rempel

Multi-sequence magnetic resonance imaging (MRI) has found wide applications in both modern clinical studies and deep learning research. However, in clinical practice, it frequently occurs that one or more of the MRI sequences are missing…

Image and Video Processing · Electrical Eng. & Systems 2024-03-21 Yunjie Chen , Marius Staring , Olaf M. Neve , Stephan R. Romeijn , Erik F. Hensen , Berit M. Verbist , Jelmer M. Wolterink , Qian Tao

In this paper, we propose an enhanced CNN model for detecting supernovae (SNe). This is done by applying a new method for obtaining rotational invariance that exploits cyclic symmetry. In addition, we use a visualization approach, the…

Instrumentation and Methods for Astrophysics · Physics 2019-01-24 Esteban Reyes , Pablo A. Estévez , Ignacio Reyes , Guillermo Cabrera-Vives , Pablo Huijse , Rodrigo Carrasco-Davis , Francisco Förster

Gravity inversion is the problem of estimating subsurface density distributions from observed gravitational field data. We consider the two-dimensional (2D) case, in which recovering density models from one-dimensional (1D) measurements…

Inversion codes are numerical tools used for the inference of physical properties from the observations. Despite their success, the quality of current spectropolarimetric observations and those expected in the near future presents a…

Solar and Stellar Astrophysics · Physics 2015-05-27 A. Asensio Ramos , J. de la Cruz Rodriguez

Accurate wind speed forecasting is of great importance for many economic, business and management sectors. This paper introduces a new model based on convolutional neural networks (CNNs) for wind speed prediction tasks. In particular, we…

Machine Learning · Computer Science 2020-07-27 Kevin Trebing , Siamak Mehrkanoon

Deep neural networks have been applied to improve the image quality of fluorescence microscopy imaging. Previous methods are based on convolutional neural networks (CNNs) which generally require more time-consuming training of separate…

Observing 3D magnetic fields, including orientation and strength, within the interstellar medium is vital but notoriously difficult. However, recent advances in our understanding of anisotropic magnetohydrodynamic (MHD) turbulence…

Astrophysics of Galaxies · Physics 2023-12-06 Yue Hu , A. Lazarian , Yan Wu , Chengcheng Fu

Context: New spectroscopic surveys will increase the number of astronomical objects requiring characterization by over tenfold.. Machine learning tools are required to address this data deluge in a fast and accurate fashion. Most machine…

A convolutional neural network (CNN) is used to construct a new catalog for solar flares based on high resolution (1-s cadence) Geostationary Operational Environmental Satellites (GOES) soft X-ray data. The CNN is trained to identify flare…

Solar and Stellar Astrophysics · Physics 2026-04-13 Nastaran Farhang , Michael. S. Wheatland , Andrew Melatos

In the past, spectropolarimetric data from Hinode/SP has been employed to infer the distribution of the magnetic field vector in the quiet Sun. While some authors have found predominantly horizontal magnetic fields, others favor an…

Solar and Stellar Astrophysics · Physics 2015-05-20 J. M. Borrero , P. Kobel

Deep Learning methods, specifically convolutional neural networks (CNNs), have seen a lot of success in the domain of image-based data, where the data offers a clearly structured topology in the regular lattice of pixels. This…

Machine Learning · Statistics 2018-05-31 Thomas Teh , Chaiyawan Auepanwiriyakul , John Alexander Harston , A. Aldo Faisal

The major challenges for a fully polarized radiative transfer driven approach to Zeeman-Doppler imaging are still the enormous computational requirements. In every cycle of the iterative interplay between the forward process (spectral…

Astrophysics · Physics 2008-07-25 T. A. Carroll , M. Kopf , K. G. Strassmeier

Track reconstruction algorithms are critical for polarization measurements. In addition to traditional moment-based track reconstruction approaches, convolutional neural networks (CNN) are a promising alternative. However, hexagonal grid…

Instrumentation and Methods for Astrophysics · Physics 2023-11-15 Ya-Nan Li , Jia-Huan Zhu , Huai-Zhong Gao , Hong Li , Ji-Rong Cang , Zhi Zeng , Hua Feng , Ming Zeng