Search Results for author: Nicolas Papadakis

Found 26 papers, 1 papers with code

POPCORN: Progressive Pseudo-labeling with Consistency Regularization and Neighboring

no code implementations13 Sep 2021 Reda Abdellah Kamraoui, Vinh-Thong Ta, Nicolas Papadakis, Fanny Compaire, José V Manjon, Pierrick Coupé

Semi-supervised learning (SSL) uses unlabeled data to compensate for the scarcity of annotated images and the lack of method generalization to unseen domains, two usual problems in medical segmentation tasks.

Lesion Segmentation Semantic Segmentation

Learning local regularization for variational image restoration

no code implementations11 Feb 2021 Jean Prost, Antoine Houdard, Andrés Almansa, Nicolas Papadakis

In this work, we propose a framework to learn a local regularization model for solving general image restoration problems.

Deblurring Denoising +1

On the Existence of Optimal Transport Gradient for Learning Generative Models

no code implementations10 Feb 2021 Antoine Houdard, Arthur Leclaire, Nicolas Papadakis, Julien Rabin

Training of WGAN relies on a theoretical background: the calculation of the gradient of the optimal transport cost with respect to the generative model parameters.

GraphXCOVID: Explainable Deep Graph Diffusion Pseudo-Labelling for Identifying COVID-19 on Chest X-rays

no code implementations30 Sep 2020 Angelica I. Aviles-Rivero, Philip Sellars, Carola-Bibiane Schönlieb, Nicolas Papadakis

The creation of which is a heavily expensive and time consuming task, and especially imposes a great challenge for a novel disease.

Multi-task deep learning for image segmentation using recursive approximation tasks

no code implementations26 May 2020 Rihuan Ke, Aurélie Bugeau, Nicolas Papadakis, Mark Kirkland, Peter Schuetz, Carola-Bibiane Schönlieb

The subproblems are handled by a framework that consists of 1) a segmentation task that learns from pixel-level ground truth segmentation masks of a small fraction of the images, 2) a recursive approximation task that conducts partial object regions learning and data-driven mask evolution starting from partial masks of each object instance, and 3) other problem oriented auxiliary tasks that are trained with sparse annotations and promote the learning of dedicated features.

Multi-Task Learning Semantic Segmentation

Block based refitting in $\ell_{12}$ sparse regularisation

no code implementations22 Oct 2019 Charles-Alban Deledalle, Nicolas Papadakis, Joseph Salmon, Samuel Vaiter

This is done through the use of refitting block penalties that only act on the support of the estimated solution.

Image Restoration

Evaluation Framework of Superpixel Methods with a Global Regularity Measure

no code implementations17 Mar 2019 Rémi Giraud, Vinh-Thong Ta, Nicolas Papadakis

To measure the regularity aspect, we propose a new global regularity measure (GR), which addresses the non-robustness of state-of-the-art metrics.

Robust Shape Regularity Criteria for Superpixel Evaluation

no code implementations17 Mar 2019 Rémi Giraud, Vinh-Thong Ta, Nicolas Papadakis

Regular decompositions are necessary for most superpixel-based object recognition or tracking applications.

Object Recognition

SCALP: Superpixels with Contour Adherence using Linear Path

no code implementations17 Mar 2019 Rémi Giraud, Vinh-Thong Ta, Nicolas Papadakis

In this paper, we propose a fast method to compute Superpixels with Contour Adherence using Linear Path (SCALP) in an iterative clustering framework.

Contour Detection

Robust superpixels using color and contour features along linear path

no code implementations17 Mar 2019 Rémi Giraud, Vinh-Thong Ta, Nicolas Papadakis

During the decomposition, we propose to consider color features along the linear path between the pixel and the corresponding superpixel barycenter.

Superpixel-based Color Transfer

no code implementations14 Mar 2019 Rémi Giraud, Vinh-Thong Ta, Nicolas Papadakis

In this work, we propose a fast superpixel-based color transfer method (SCT) between two images.

Texture-Aware Superpixel Segmentation

no code implementations30 Jan 2019 Remi Giraud, Vinh-Thong Ta, Nicolas Papadakis, Yannick Berthoumieu

Most superpixel algorithms compute a trade-off between spatial and color features at the pixel level.

Characterizing the maximum parameter of the total-variation denoising through the pseudo-inverse of the divergence

no code implementations8 Dec 2016 Charles-Alban Deledalle, Nicolas Papadakis, Joseph Salmon, Samuel Vaiter

Though, it is of importance when tuning the regularization parameter as it allows fixing an upper-bound on the grid for which the optimal parameter is sought.


Regularized Optimal Transport and the Rot Mover's Distance

no code implementations20 Oct 2016 Arnaud Dessein, Nicolas Papadakis, Jean-Luc Rouas

This paper presents a unified framework for smooth convex regularization of discrete optimal transport problems.

Scene Classification

Convex Histogram-Based Joint Image Segmentation with Regularized Optimal Transport Cost

no code implementations5 Oct 2016 Nicolas Papadakis, Julien Rabin

We investigate in this work a versatile convex framework for multiple image segmentation, relying on the regularized optimal mass transport theory.

Semantic Segmentation

Convex Color Image Segmentation with Optimal Transport Distances

no code implementations6 Mar 2015 Julien Rabin, Nicolas Papadakis

This work is about the use of regularized optimal-transport distances for convex, histogram-based image segmentation.

Semantic Segmentation

Regularized Discrete Optimal Transport

1 code implementation21 Jul 2013 Sira Ferradans, Nicolas Papadakis, Gabriel Peyré, Jean-François Aujol

The resulting transportation plan can be used as a color transfer map, which is robust to mass variation across images color palettes.


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