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Publications

Affichage des publications 81 à 90 sur 315 au total

Traitement des images

A Reliable JPEG Quantization Table Estimator

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, Miguel Colom, Jean-Michel Morel, Rafael Grompone von Gioi

Image Processing On Line -

Statistiques

Demosaicing to Detect Demosaicing and Image Forgeries

The trustfulness of images is a critical concern. Digital photographs can no longer be assumed to be truthful; indeed, digital image editing tools can easily and convincingly alter the semantic content of an image. Being able to analyse an image to…

Quentin Bammey, Rafael Grompone von Gioi, Jean-Michel Morel

2022 IEEE International Workshop on Information Forensics and Security (WIFS) -

Mathématiques

Revenue-Maximizing Auctions: A Bidder’s Standpoint

A vast part of the Internet economy is powered by advertising, much of which is sold at auction. A key question for sellers is how to optimize the auction mechanism they use. Bidders, conversely, try to optimize their bidding strategy. Incentive…

Thomas Nedelec, Clément Calauzènes, Vianney Perchet, Noureddine El Karoui

Operations Research -

Statistiques

Forgery Detection by Internal Positional Learning of Demosaicing Traces

We propose 4Point (Forensics with Positional Internal Training), an unsupervised neural network trained to assess the consistency of the image colour mosaic to find forgeries. Positional learning trains the model to learn the modulo-2 position of…

Quentin Bammey, Rafael Grompone von Gioi, Jean-Michel Morel

2022 IEEE/CVF Winter Conference on Applications of Computer Vision (WACV) -

Apprentissage

Classification non-supervisée de documents à partir des modèles Transformeurs

Les plongements de mots pré-entraînés basés sur les modèles Transformeur sont maintenant largement utilisés dans l'exploration de textes où ils sont connus pour améliorer de manière significative les tâches supervisées telles que la classification…

Mira Ait-Saada, François Role, Mohamed Nadif

Revue des Nouvelles Technologies de l'Information, Extraction et Gestion des Connaissances, RNTI-E-38 -

Traitement du signal et de l'image

Improved Sentinel-1 IW Burst Stitching through Geolocation Error Correction Considerations

Since the commissioning phase of Sentinel-1A, several calibration studies have improved the geolocation and geometric modeling of the data. The implementation of the corrections presented in these studies is left to the user. The issues found might…

Roland Akiki, Jérémy Anger, Carlo de Franchis, Gabriele Facciolo, Jean-Michel Morel, Raphaël Grandin

IGARSS 2022-2022 IEEE International Geoscience and Remote Sensing Symposium -

Traitement des images

High Dynamic Range and Super-Resolution from Raw Image Bursts

Photographs captured by smartphones and mid-range cameras have limited spatial resolution and dynamic range, with noisy response in underexposed regions and color artefacts in saturated areas. This paper introduces the first approach (to the best of…

Bruno Lecouat, Thomas Eboli, Jean Ponce, Julien Mairal

ACM Transactions on Graphics -