Search Results for author: Pietro Gori

Found 32 papers, 15 papers with code

Separating common from salient patterns with Contrastive Representation Learning

1 code implementation19 Feb 2024 Robin Louiset, Edouard Duchesnay, Antoine Grigis, Pietro Gori

Then, we motivate a novel Mutual Information minimization strategy to prevent information leakage between common and salient distributions.

Contrastive Learning Representation Learning

Double InfoGAN for Contrastive Analysis

1 code implementation31 Jan 2024 Florence Carton, Robin Louiset, Pietro Gori

Experimental results on four visual datasets, from simple synthetic examples to complex medical images, show that the proposed method outperforms SOTA CA-VAEs in terms of latent separation and image quality.

SepVAE: a contrastive VAE to separate pathological patterns from healthy ones

1 code implementation12 Jul 2023 Robin Louiset, Edouard Duchesnay, Antoine Grigis, Benoit Dufumier, Pietro Gori

Contrastive Analysis VAE (CA-VAEs) is a family of Variational auto-encoders (VAEs) that aims at separating the common factors of variation between a background dataset (BG) (i. e., healthy subjects) and a target dataset (TG) (i. e., patients) from the ones that only exist in the target dataset.

Weakly-supervised positional contrastive learning: application to cirrhosis classification

1 code implementation10 Jul 2023 Emma Sarfati, Alexandre Bône, Marc-Michel Rohé, Pietro Gori, Isabelle Bloch

Large medical imaging datasets can be cheaply and quickly annotated with low-confidence, weak labels (e. g., radiological scores).

Classification Contrastive Learning

Contrastive learning for regression in multi-site brain age prediction

no code implementations14 Nov 2022 Carlo Alberto Barbano, Benoit Dufumier, Edouard Duchesnay, Marco Grangetto, Pietro Gori

Building accurate Deep Learning (DL) models for brain age prediction is a very relevant topic in neuroimaging, as it could help better understand neurodegenerative disorders and find new biomarkers.

Contrastive Learning regression

Unbiased Supervised Contrastive Learning

1 code implementation10 Nov 2022 Carlo Alberto Barbano, Benoit Dufumier, Enzo Tartaglione, Marco Grangetto, Pietro Gori

In this work, we tackle the problem of learning representations that are robust to biases.

Contrastive Learning

Anatomically constrained CT image translation for heterogeneous blood vessel segmentation

no code implementations4 Oct 2022 Giammarco La Barbera, Haithem Boussaid, Francesco Maso, Sabine Sarnacki, Laurence Rouet, Pietro Gori, Isabelle Bloch

Anatomical structures such as blood vessels in contrast-enhanced CT (ceCT) images can be challenging to segment due to the variability in contrast medium diffusion.

Translation

Optimizing transformations for contrastive learning in a differentiable framework

no code implementations27 Jul 2022 Camille Ruppli, Pietro Gori, Roberto Ardon, Isabelle Bloch

Following previous works that introduce a small amount of supervision, we propose a framework to find optimal transformations for contrastive learning using a differentiable transformation network.

Contrastive Learning

Is the U-Net Directional-Relationship Aware?

1 code implementation6 Jul 2022 Mateus Riva, Pietro Gori, Florian Yger, Isabelle Bloch

CNNs are often assumed to be capable of using contextual information about distinct objects (such as their directional relations) inside their receptive field.

Segmentation

Integrating Prior Knowledge in Contrastive Learning with Kernel

1 code implementation3 Jun 2022 Benoit Dufumier, Carlo Alberto Barbano, Robin Louiset, Edouard Duchesnay, Pietro Gori

To this end, we use kernel theory to propose a novel loss, called decoupled uniformity, that i) allows the integration of prior knowledge and ii) removes the negative-positive coupling in the original InfoNCE loss.

Contrastive Learning Data Augmentation

Real-time Virtual-Try-On from a Single Example Image through Deep Inverse Graphics and Learned Differentiable Renderers

no code implementations12 May 2022 Robin Kips, Ruowei Jiang, Sileye Ba, Brendan Duke, Matthieu Perrot, Pietro Gori, Isabelle Bloch

In this paper we propose a novel framework based on deep learning to build a real-time inverse graphics encoder that learns to map a single example image into the parameter space of a given augmented reality rendering engine.

Neural Rendering Self-Supervised Learning +1

Hair Color Digitization through Imaging and Deep Inverse Graphics

no code implementations8 Feb 2022 Robin Kips, Panagiotis-Alexandros Bokaris, Matthieu Perrot, Pietro Gori, Isabelle Bloch

Since rendering realistic hair images requires path-tracing rendering, the conventional inverse graphics approach based on differentiable rendering is untractable.

A deep residual learning implementation of Metamorphosis

no code implementations1 Feb 2022 Matthis Maillard, Anton François, Joan Glaunès, Isabelle Bloch, Pietro Gori

In medical imaging, most of the image registration methods implicitly assume a one-to-one correspondence between the source and target images (i. e., diffeomorphism).

Image Registration

Conditional Alignment and Uniformity for Contrastive Learning with Continuous Proxy Labels

no code implementations10 Nov 2021 Benoit Dufumier, Pietro Gori, Julie Victor, Antoine Grigis, Edouard Duchesnay

However, a particularity of medical images is the availability of meta-data (such as age or sex) that can be exploited for learning representations.

Contrastive Learning

Template-Based Graph Clustering

1 code implementation5 Jul 2021 Mateus Riva, Florian Yger, Pietro Gori, Roberto M. Cesar Jr., Isabelle Bloch

We propose a novel graph clustering method guided by additional information on the underlying structure of the clusters (or communities).

Clustering Graph Clustering

Fast and Scalable Optimal Transport for Brain Tractograms

no code implementations5 Jul 2021 Jean Feydy, Pierre Roussillon, Alain Trouvé, Pietro Gori

The parameters -- blur and reach -- of our method are meaningful, defining the minimum and maximum distance at which two fibers are compared with each other.

Knowledge distillation from multi-modal to mono-modal segmentation networks

no code implementations17 Jun 2021 Minhao Hu, Matthis Maillard, Ya zhang, Tommaso Ciceri, Giammarco La Barbera, Isabelle Bloch, Pietro Gori

In this paper, we propose KD-Net, a framework to transfer knowledge from a trained multi-modal network (teacher) to a mono-modal one (student).

Brain Tumor Segmentation Image Segmentation +3

Metamorphic image registration using a semi-Lagrangian scheme

1 code implementation16 Jun 2021 Anton François, Pietro Gori, Joan Glaunès

In this paper, we propose an implementation of both Large Deformation Diffeomorphic Metric Mapping (LDDMM) and Metamorphosis image registration using a semi-Lagrangian scheme for geodesic shooting.

Image Registration

Deep Graphics Encoder for Real-Time Video Makeup Synthesis from Example

no code implementations12 May 2021 Robin Kips, Ruowei Jiang, Sileye Ba, Edmund Phung, Parham Aarabi, Pietro Gori, Matthieu Perrot, Isabelle Bloch

While makeup virtual-try-on is now widespread, parametrizing a computer graphics rendering engine for synthesizing images of a given cosmetics product remains a challenging task.

Virtual Try-on

Approximation of dilation-based spatial relations to add structural constraints in neural networks

no code implementations22 Feb 2021 Mateus Riva, Pietro Gori, Florian Yger, Roberto Cesar, Isabelle Bloch

Several relations can be modeled as a morphological dilation of a reference object with a structuring element representing the semantics of the relation, from which the degree of satisfaction of the relation between another object and the reference object can be derived.

Object Object Recognition +1

CA-GAN: Weakly Supervised Color Aware GAN for Controllable Makeup Transfer

no code implementations24 Aug 2020 Robin Kips, Pietro Gori, Matthieu Perrot, Isabelle Bloch

While existing makeup style transfer models perform an image synthesis whose results cannot be explicitly controlled, the ability to modify makeup color continuously is a desirable property for virtual try-on applications.

Attribute Image Generation +3

White Matter Fiber Segmentation Using Functional Varifolds

no code implementations18 Sep 2017 Kuldeep Kumar, Pietro Gori, Benjamin Charlier, Stanley Durrleman, Olivier Colliot, Christian Desrosiers

We use it to cluster fibers with a dictionary learning and sparse coding-based framework, and present a preliminary analysis using HCP data.

Dictionary Learning

Comparison of Distances for Supervised Segmentation of White Matter Tractography

1 code implementation4 Aug 2017 Emanuele Olivetti, Giulia Bertò, Pietro Gori, Nusrat Sharmin, Paolo Avesani

For these reasons, in this work we compare many streamline distance functions available in the literature.

Segmentation

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