Search Results for author: Nicolas Pugeault

Found 20 papers, 6 papers with code

The role of noise in denoising models for anomaly detection in medical images

1 code implementation19 Jan 2023 Antanas Kascenas, Pedro Sanchez, Patrick Schrempf, Chaoyang Wang, William Clackett, Shadia S. Mikhael, Jeremy P. Voisey, Keith Goatman, Alexander Weir, Nicolas Pugeault, Sotirios A. Tsaftaris, Alison Q. O'Neil

Denoising methods, for instance classical denoising autoencoders (DAEs) and more recently emerging diffusion models, are a promising approach, however naive application of pixelwise noise leads to poor anomaly detection performance.

Denoising Unsupervised Anomaly Detection

A deep mixture density network for outlier-corrected interpolation of crowd-sourced weather data

no code implementations25 Jan 2022 Charlie Kirkwood, Theo Economou, Henry Odbert, Nicolas Pugeault

However, as the number of available observation sites increases, so too does the opportunity for data quality issues to emerge, particularly given that many of these sensors do not have the benefit of official maintenance teams.

Outlier Detection

Transformer-Encoder Detector Module: Using Context to Improve Robustness to Adversarial Attacks on Object Detection

no code implementations13 Nov 2020 Faisal Alamri, Sinan Kalkan, Nicolas Pugeault

Deep neural network approaches have demonstrated high performance in object recognition (CNN) and detection (Faster-RCNN) tasks, but experiments have shown that such architectures are vulnerable to adversarial attacks (FFF, UAP): low amplitude perturbations, barely perceptible by the human eye, can lead to a drastic reduction in labeling performance.

Object object-detection +2

Bayesian deep learning for mapping via auxiliary information: a new era for geostatistics?

no code implementations17 Aug 2020 Charlie Kirkwood, Theo Economou, Nicolas Pugeault

Here we demonstrate the power of feature learning in a geostatistical context, by showing how deep neural networks can automatically learn the complex relationships between point-sampled target variables and gridded auxiliary variables (such as those provided by remote sensing), and in doing so produce detailed maps of chosen target variables.

Spatial Interpolation

Real-time Facial Expression Recognition "In The Wild'' by Disentangling 3D Expression from Identity

1 code implementation12 May 2020 Mohammad Rami Koujan, Luma Alharbawee, Giorgos Giannakakis, Nicolas Pugeault, Anastasios Roussos

Human emotions analysis has been the focus of many studies, especially in the field of Affective Computing, and is important for many applications, e. g. human-computer intelligent interaction, stress analysis, interactive games, animations, etc.

Emotion Recognition Facial Expression Recognition +1

A framework for probabilistic weather forecast post-processing across models and lead times using machine learning

1 code implementation6 May 2020 Charlie Kirkwood, Theo Economou, Henry Odbert, Nicolas Pugeault

In this paper, we use a road surface temperature example to demonstrate a three-stage framework that uses machine learning to bridge the gap between sets of separate forecasts from NWP models and the 'ideal' forecast for decision support: probabilities of future weather outcomes.

BIG-bench Machine Learning Decision Making

Image Captioning through Image Transformer

2 code implementations29 Apr 2020 Sen He, Wentong Liao, Hamed R. -Tavakoli, Michael Yang, Bodo Rosenhahn, Nicolas Pugeault

Inspired by the successes in text analysis and translation, previous work have proposed the \textit{transformer} architecture for image captioning.

Image Captioning object-detection +3

Contextual Relabelling of Detected Objects

no code implementations6 Jun 2019 Faisal Alamri, Nicolas Pugeault

Contextual information, such as the co-occurrence of objects and the spatial and relative size among objects provides deep and complex information about scenes.

Object object-detection +1

Human Attention in Image Captioning: Dataset and Analysis

no code implementations ICCV 2019 Sen He, Hamed R. -Tavakoli, Ali Borji, Nicolas Pugeault

In this work, we present a novel dataset consisting of eye movements and verbal descriptions recorded synchronously over images.

Image Captioning Sentence +1

Understanding and Visualizing Deep Visual Saliency Models

1 code implementation CVPR 2019 Sen He, Hamed R. -Tavakoli, Ali Borji, Yang Mi, Nicolas Pugeault

Our analyses reveal that: 1) some visual regions (e. g. head, text, symbol, vehicle) are already encoded within various layers of the network pre-trained for object recognition, 2) using modern datasets, we find that fine-tuning pre-trained models for saliency prediction makes them favor some categories (e. g. head) over some others (e. g. text), 3) although deep models of saliency outperform classical models on natural images, the converse is true for synthetic stimuli (e. g. pop-out search arrays), an evidence of significant difference between human and data-driven saliency models, and 4) we confirm that, after-fine tuning, the change in inner-representations is mostly due to the task and not the domain shift in the data.

Object Recognition Saliency Prediction +1

On-Policy Trust Region Policy Optimisation with Replay Buffers

2 code implementations ICLR 2019 Dmitry Kangin, Nicolas Pugeault

Building upon the recent success of deep reinforcement learning methods, we investigate the possibility of on-policy reinforcement learning improvement by reusing the data from several consecutive policies.

Continuous Control Policy Gradient Methods +2

What Catches the Eye? Visualizing and Understanding Deep Saliency Models

no code implementations15 Mar 2018 Sen He, Ali Borji, Yang Mi, Nicolas Pugeault

Deep convolutional neural networks have demonstrated high performances for fixation prediction in recent years.

Aggregated Sparse Attention for Steering Angle Prediction

no code implementations15 Mar 2018 Sen He, Dmitry Kangin, Yang Mi, Nicolas Pugeault

In this paper, we apply the attention mechanism to autonomous driving for steering angle prediction.

Autonomous Driving

Salient Region Segmentation

no code implementations15 Mar 2018 Sen He, Nicolas Pugeault

Early saliency models were based on low-level hand-crafted feature derived from insights gained in neuroscience and psychophysics.

Gaze Prediction regression +2

Deep saliency: What is learnt by a deep network about saliency?

no code implementations12 Jan 2018 Sen He, Nicolas Pugeault

Moreover we argue that this transformation leads to the emergence of receptive fields conceptually similar to the centre-surround filters hypothesized by early research on visual saliency.

Saliency Detection

Combination of Supervised and Reinforcement Learning For Vision-Based Autonomous Control

no code implementations ICLR 2018 Dmitry Kangin, Nicolas Pugeault

In this article we propose a model-free control method, which uses a combination of reinforcement and supervised learning for autonomous control and paves the way towards policy based control in real world environments.

reinforcement-learning Reinforcement Learning (RL)

Taking the Scenic Route to 3D: Optimising Reconstruction From Moving Cameras

no code implementations ICCV 2017 Oscar Mendez, Simon Hadfield, Nicolas Pugeault, Richard Bowden

This approach is ill-suited for reconstruction applications, where learning about the environment is more valuable than speed of traversal.

SeDAR - Semantic Detection and Ranging: Humans can localise without LiDAR, can robots?

no code implementations5 Sep 2017 Oscar Mendez, Simon Hadfield, Nicolas Pugeault, Richard Bowden

Similarly, we do not extrude the 2D geometry present in the floorplan into 3D and try to align it to the real-world.

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