Search Results for author: Santiago Velasco-Forero

Found 19 papers, 5 papers with code

Adapting the Hypersphere Loss Function from Anomaly Detection to Anomaly Segmentation

no code implementations23 Jan 2023 Joao P. C. Bertoldo, Santiago Velasco-Forero, Jesus Angulo, Etienne Decencière

We propose an incremental improvement to Fully Convolutional Data Description (FCDD), an adaptation of the one-class classification approach from anomaly detection to image anomaly segmentation (a. k. a.

One-Class Classification

Moving Frame Net: SE(3)-Equivariant Network for Volumes

1 code implementation7 Nov 2022 Mateus Sangalli, Samy Blusseau, Santiago Velasco-Forero, Jesus Angulo

Equivariance of neural networks to transformations helps to improve their performance and reduce generalization error in computer vision tasks, as they apply to datasets presenting symmetries (e. g. scalings, rotations, translations).

Translation

Scale Equivariant U-Net

no code implementations10 Oct 2022 Mateus Sangalli, Samy Blusseau, Santiago Velasco-Forero, Jesus Angulo

Therefore, this paper introduces the Scale Equivariant U-Net (SEU-Net), a U-Net that is made approximately equivariant to a semigroup of scales and translations through careful application of subsampling and upsampling layers and the use of aforementioned scale-equivariant layers.

Cell Segmentation Segmentation +1

Morphological adjunctions represented by matrices in max-plus algebra for signal and image processing

no code implementations28 Jul 2022 Samy Blusseau, Santiago Velasco-Forero, Jesus Angulo, Isabelle Bloch

In discrete signal and image processing, many dilations and erosions can be written as the max-plus and min-plus product of a matrix on a vector.

Fully trainable Gaussian derivative convolutional layer

1 code implementation18 Jul 2022 Valentin Penaud--Polge, Santiago Velasco-Forero, Jesus Angulo

The Gaussian kernel and its derivatives have already been employed for Convolutional Neural Networks in several previous works.

Image Classification Image Segmentation +1

MorphoActivation: Generalizing ReLU activation function by mathematical morphology

no code implementations13 Jul 2022 Santiago Velasco-Forero, Jesús Angulo

This paper analyses both nonlinear activation functions and spatial max-pooling for Deep Convolutional Neural Networks (DCNNs) by means of the algebraic basis of mathematical morphology.

Differential invariants for SE(2)-equivariant networks

1 code implementation27 Jun 2022 Mateus Sangalli, Samy Blusseau, Santiago Velasco-Forero, Jesús Angulo

Symmetry is present in many tasks in computer vision, where the same class of objects can appear transformed, e. g. rotated due to different camera orientations, or scaled due to perspective.

Near out-of-distribution detection for low-resolution radar micro-Doppler signatures

2 code implementations12 May 2022 Martin Bauw, Santiago Velasco-Forero, Jesus Angulo, Claude Adnet, Olivier Airiau

We emphasize the relevance of OODD and its specific supervision requirements for the detection of a multimodal, diverse targets class among other similar radar targets and clutter in real-life critical systems.

Contrastive Learning Geometry-aware processing +4

Paris-CARLA-3D: A Real and Synthetic Outdoor Point Cloud Dataset for Challenging Tasks in 3D Mapping

no code implementations22 Nov 2021 Jean-Emmanuel Deschaud, David Duque, Jean Pierre Richa, Santiago Velasco-Forero, Beatriz Marcotegui, and François Goulette

The data are composed of two sets with synthetic data from the open source CARLA simulator (700 million points) and real data acquired in the city of Paris (60 million points), hence the name Paris-CARLA-3D.

Instance Segmentation Semantic Segmentation

From Unsupervised to Semi-supervised Anomaly Detection Methods for HRRP Targets

no code implementations10 Jun 2021 Martin Bauw, Santiago Velasco-Forero, Jesus Angulo, Claude Adnet, Olivier Airiau

Responding to the challenge of detecting unusual radar targets in a well identified environment, innovative anomaly and novelty detection methods keep emerging in the literature.

Novelty Detection Semi-supervised Anomaly Detection +2

Scale Equivariant Neural Networks with Morphological Scale-Spaces

no code implementations4 May 2021 Mateus Sangalli, Samy Blusseau, Santiago Velasco-Forero, Jesus Angulo

The translation equivariance of convolutions can make convolutional neural networks translation equivariant or invariant.

Segmentation Semantic Segmentation +1

Road Segmentation on low resolution Lidar point clouds for autonomous vehicles

no code implementations27 May 2020 Leonardo Gigli, B Ravi Kiran, Thomas Paul, Andres Serna, Nagarjuna Vemuri, Beatriz Marcotegui, Santiago Velasco-Forero

In our experiments the low resolution 16/32 layer LIDAR point clouds are simulated by subsampling the original 64 layer data, for subsequent transformation in to a feature map in the Bird-Eye-View (BEV) and SphericalView (SV) representations of the point cloud.

Autonomous Driving Road Segmentation +1

Dealing with Topological Information within a Fully Convolutional Neural Network

no code implementations27 Jun 2019 Etienne Decencière, Santiago Velasco-Forero, Fu Min, Juanjuan Chen, Hélène Burdin, Gervais Gauthier, Bruno Laÿ, Thomas Bornschloegl, Thérèse Baldeweck

A fully convolutional neural network has a receptive field of limited size and therefore cannot exploit global information, such as topological information.

Max-plus Operators Applied to Filter Selection and Model Pruning in Neural Networks

1 code implementation19 Mar 2019 Yunxiang Zhang, Samy Blusseau, Santiago Velasco-Forero, Isabelle Bloch, Jesus Angulo

Following recent advances in morphological neural networks, we propose to study in more depth how Max-plus operators can be exploited to define morphological units and how they behave when incorporated in layers of conventional neural networks.

Segmentation hiérarchique faiblement supervisée

no code implementations20 Feb 2018 Amin Fehri, Santiago Velasco-Forero, Fernand Meyer

Image segmentation is the process of partitioning an image into a set of meaningful regions according to some criteria.

Image Segmentation Position +3

Prior-based Hierarchical Segmentation Highlighting Structures of Interest

no code implementations9 Mar 2017 Amin Fehri, Santiago Velasco-Forero, Fernand Meyer

Image segmentation is the process of partitioning an image into a set of meaningful regions according to some criteria.

Image Segmentation Position +2

Automatic Selection of Stochastic Watershed Hierarchies

no code implementations9 Sep 2016 Amin Fehri, Santiago Velasco-Forero, Fernand Meyer

A coarser partition is obtained by merging adjacent regions of a finer partition.

Segmentation

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