Publications

Signal and Image processing

Video denoising by combining patch search and CNNs

Non-local patch based methods were until recently the state of the art for image denoising but are now outperformed by CNNs. In video denoising however, they are still competitive with CNNs, as they can effectively exploit the video temporal…

Axel Davy, Thibaud Ehret, Jean-Michel Morel, Pablo Arias, Gabriele Facciolo

Journal of Mathematical Imaging and Vision - 2021

Santé publique et épidémiologie

Computing the daily reproduction number of COVID-19 by inverting the renewal equation using a variational technique

Significance Based on a signal-processing approach, we propose a method to compute the reproduction number R t , the transmission potential of an epidemic over time. R t is estimated by minimizing a functional that enforces: 1) the ability to…

Luis Alvarez, Miguel Colom, Jean-David Morel, Jean-Michel Morel

Proceedings of the National Academy of Sciences of the United States of America - 2021

Image Processing

ZERO: a Local JPEG Grid Origin Detector Based on the Number of DCT Zeros and its Applications in Image Forensics

JPEG compression is a commonly used method of lossy compression for digital images. The degree of compression can be adjusted by the choice of a quality factor QF. Each software associates this value to a quantization table, which is a 8 × 8 matrix…

Tina Nikoukhah, Jérémy Anger, Miguel Colom, Jean-Michel Morel, Rafael Grompone von Gioi

Image Processing On Line - 2021

Computer Vision and Pattern Recognition

Reproducible Research in Pattern Recognition: Third International Workshop, RRPR 2021

Bertrand Kerautret, Miguel Colom, Adrien Krähenbühl, Daniel Lopresti, Pascal Monasse, Hugues Talbot

Mathematics

Piecewise deterministic Markov processes and their invariant measures

Piecewise Deterministic Markov Processes (PDMPs) are studied in a general framework. First, different constructions are proven to be equivalent. Second, we introduce a coupling between two PDMPs following the same differential flow which implies…

Alain Durmus, Arnaud Guillin, Pierre Monmarché

Annales de l'Institut Henri Poincaré (B) Probabilités et Statistiques - 2021

Machine Learning

How to Leverage a Multi-layered Transformer Language Model for Text Clustering: an Ensemble Approach

Pre-trained Transformer-based word embeddings are now widely used in text mining where they are known to significantly improve supervised tasks such as text classification and named entity recognition and question answering. Since the Transformer…

Mira Ait-Saada, François Role, Mohamed Nadif

CIKM '21: The 30th ACM International Conference on Information and Knowledge Management - 2021

Signal and Image processing

A Contrario Oil Tank Detection with Patch Match Completion

The energy sector is a key industry in the global economy and monitoring oil storage provides valuable insights into the economic state of a country. Our aim is to detect oil tank farms as accurately as possible using Sentinel-2 images. An a…

Antoine Tadros, Sebastien Drouyer, Rafael Grompone von Gioi

IGARSS 2021 - 2021 IEEE International Geoscience and Remote Sensing Symposium - 2021

Life Sciences

Arterial spin labeling brain MRI study to evaluate the impact of deafness on cerebral perfusion in 79 children before cochlear implantation

Age at implantation is considered to be a major factor, influencing outcomes after pediatric cochlear implantation. In the absence of acoustic input, it has been proposed that cross-modal reorganization can be detrimental for adaptation to the new…

Arnaud Coez, Ludovic Fillon, Ana Saitovitch, Caroline Rutten, Sandrine Marlin, Jennifer Boisgontier, Alice Vinçon-Leite, Hervé Lemaitre, David Grévent, Charles-Joris Roux, Volodia Dangouloff-Ros, Raphaël Levy, Eric Bizaguet, Isabelle Rouillon, Eréa Noël Garabédian, Françoise Denoyelle, Monica Zilbovicius, Natalie Loundon, Nathalie Boddaert

Neuroimage-Clinical - 2021

Computer Vision and Pattern Recognition

A Generic Bundle Adjustment Methodology for Indirect RPC Model Refinement of Satellite Imagery

This article describes a generic bundle adjustment methodology for multi-view stereo pipelines for 3D reconstruction from high-resolution optical satellite imagery. The Rational Polynomial Camera (RPC) model of each input view is refined by…

Roger Marí, Carlo de Franchis, Enric Meinhardt-Llopis, Jérémy Anger, Gabriele Facciolo

Image Processing On Line - 2021

Sociology

Online consultations in mental healthcare during the COVID-19 outbreak: An international survey study on professionals' motivations and perceived barriers

Introduction: While the general uptake of e-mental health interventions remained low over the past years, physical distancing and lockdown measures relating to the COVID-19 pandemic created a need and demand for online consultations in only a matter…

Nele A.J. de Witte, Per Carlbring, Anne Etzelmueller, Tine Nordgreen, Maria Karekla, Lise Haddouk, Angélique Belmont, Svein Øverland, Rudy Abi-Habib, Sylvie Bernaerts, Agostino Brugnera, Angelo Compare, Aranzazu Duque, David Daniel Ebert, Jonas Eimontas, Angelos Kassianos, João Salgado, Andreas Schwerdtfeger, Pia Tohme, Eva van Assche, Tom van Daele

Internet Interventions - 2021