Search Results for author: Fernando Alonso-Fernandez

Found 71 papers, 6 papers with code

Predicting Overtakes in Trucks Using CAN Data

no code implementations8 Apr 2024 Talha Hanif Butt, Prayag Tiwari, Fernando Alonso-Fernandez

Safe overtakes in trucks are crucial to prevent accidents, reduce congestion, and ensure efficient traffic flow, making early prediction essential for timely and informed driving decisions.

Keypoint Description by Symmetry Assessment -- Applications in Biometrics

no code implementations3 Nov 2023 Anna Mikaelyan, Fernando Alonso-Fernandez, Josef Bigun

The origin is also a unique singularity of all harmonic functions, helping to determine the location of a keypoint precisely, whereas the functions describe the object shape of the neighborhood.

Log-Likelihood Score Level Fusion for Improved Cross-Sensor Smartphone Periocular Recognition

no code implementations2 Nov 2023 Fernando Alonso-Fernandez, Kiran B. Raja, Christoph Busch, Josef Bigun

The proliferation of cameras and personal devices results in a wide variability of imaging conditions, producing large intra-class variations and a significant performance drop when images from heterogeneous environments are compared.

Decision Making

Exploring Deep Learning Image Super-Resolution for Iris Recognition

no code implementations2 Nov 2023 Eduardo Ribeiro, Andreas Uhl, Fernando Alonso-Fernandez, Reuben A. Farrugia

In this work we test the ability of deep learning methods to provide an end-to-end mapping between low and high resolution images applying it to the iris recognition problem.

Image Super-Resolution Iris Recognition

EFaR 2023: Efficient Face Recognition Competition

1 code implementation8 Aug 2023 Jan Niklas Kolf, Fadi Boutros, Jurek Elliesen, Markus Theuerkauf, Naser Damer, Mohamad Alansari, Oussama Abdul Hay, Sara Alansari, Sajid Javed, Naoufel Werghi, Klemen Grm, Vitomir Štruc, Fernando Alonso-Fernandez, Kevin Hernandez Diaz, Josef Bigun, Anjith George, Christophe Ecabert, Hatef Otroshi Shahreza, Ketan Kotwal, Sébastien Marcel, Iurii Medvedev, Bo Jin, Diogo Nunes, Ahmad Hassanpour, Pankaj Khatiwada, Aafan Ahmad Toor, Bian Yang

To drive further development of efficient face recognition models, the submitted solutions are ranked based on a weighted score of the achieved verification accuracies on a diverse set of benchmarks, as well as the deployability given by the number of floating-point operations and model size.

Lightweight Face Recognition Quantization

Periocular biometrics: databases, algorithms and directions

no code implementations26 Jul 2023 Fernando Alonso-Fernandez, Josef Bigun

Periocular biometrics has been established as an independent modality due to concerns on the performance of iris or face systems in uncontrolled conditions.

Gender Classification

An Explainable Model-Agnostic Algorithm for CNN-based Biometrics Verification

no code implementations25 Jul 2023 Fernando Alonso-Fernandez, Kevin Hernandez-Diaz, Jose M. Buades, Prayag Tiwari, Josef Bigun

This paper describes an adaptation of the Local Interpretable Model-Agnostic Explanations (LIME) AI method to operate under a biometric verification setting.

Drone navigation and license place detection for vehicle location in indoor spaces

no code implementations19 Jul 2023 Moa Arvidsson, Sithichot Sawirot, Cristofer Englund, Fernando Alonso-Fernandez, Martin Torstensson, Boris Duran

This work is aimed at creating a solution based on a nano-drone that navigates across rows of parked vehicles and detects their license plates.

Drone navigation Position

One-Shot Learning for Periocular Recognition: Exploring the Effect of Domain Adaptation and Data Bias on Deep Representations

no code implementations11 Jul 2023 Kevin Hernandez-Diaz, Fernando Alonso-Fernandez, Josef Bigun

In this paper, we investigate the behavior of deep representations in widely used CNN models under extreme data scarcity for One-Shot periocular recognition, a biometric recognition task.

Domain Adaptation One-Shot Learning

Dynamic Causal Explanation Based Diffusion-Variational Graph Neural Network for Spatio-temporal Forecasting

1 code implementation16 May 2023 Guojun Liang, Prayag Tiwari, Sławomir Nowaczyk, Stefan Byttner, Fernando Alonso-Fernandez

Also, by F1-score and probability distribution analysis, we demonstrate that DVGNN better reflects the causal relationship and uncertainty of dynamic graphs.

graph construction Spatio-Temporal Forecasting

Periocular Biometrics: A Modality for Unconstrained Scenarios

no code implementations28 Dec 2022 Fernando Alonso-Fernandez, Josef Bigun, Julian Fierrez, Naser Damer, Hugo Proença, Arun Ross

Periocular refers to the externally visible region of the face that surrounds the eye socket.

Synthetic Data for Object Classification in Industrial Applications

no code implementations9 Dec 2022 August Baaz, Yonan Yonan, Kevin Hernandez-Diaz, Fernando Alonso-Fernandez, Felix Nilsson

In object classification, capturing a large number of images per object and in different conditions is not always possible and can be very time-consuming and tedious.

Classification Object

Image-Based Fire Detection in Industrial Environments with YOLOv4

no code implementations9 Dec 2022 Otto Zell, Joel Pålsson, Kevin Hernandez-Diaz, Fernando Alonso-Fernandez, Felix Nilsson

Accordingly, this work looks into the potential of AI to detect and recognize fires and reduce detection time using object detection on an image stream.

Fire Detection Object +2

Fingerprint Image-Quality Estimation and its Application to Multialgorithm Verification

no code implementations24 Nov 2022 Hartwig Fronthaler, Klaus Kollreider, Josef Bigun, Julian Fierrez, Fernando Alonso-Fernandez, Javier Ortega-Garcia, Joaquin Gonzalez-Rodriguez

This is also supported by numerous experiments involving a simpler quality estimator, a trained method (NFIQ), as well as the human perception of fingerprint quality on several public databases.

Computational Efficiency Image Quality Estimation

Experimental analysis regarding the influence of iris segmentation on the recognition rate

no code implementations10 Nov 2022 Heinz Hofbauer, Fernando Alonso-Fernandez, Josef Bigun, Andreas Uhl

In this study the authors will look at the detection and segmentation of the iris and its influence on the overall performance of the iris-biometric tool chain.

Iris Segmentation Segmentation

Near-infrared and visible-light periocular recognition with Gabor features using frequency-adaptive automatic eye detection

no code implementations10 Nov 2022 Fernando Alonso-Fernandez, Josef Bigun

We present a new system for eye detection based on complex symmetry filters, which has the advantage of not needing training.

Real-time AdaBoost cascade face tracker based on likelihood map and optical flow

no code implementations25 Oct 2022 Andreas Ranftl, Fernando Alonso-Fernandez, Stefan Karlsson, Josef Bigun

Tracking capabilities are provided by extrapolating the position of the likelihood map to the next frame by optical flow computation.

Optical Flow Estimation Position

Iris super-resolution using CNNs: is photo-realism important to iris recognition?

no code implementations24 Oct 2022 Eduardo Ribeiro, Andreas Uhl, Fernando Alonso-Fernandez

The use of low-resolution images adopting more relaxed acquisition conditions such as mobile phones and surveillance videos is becoming increasingly common in iris recognition nowadays.

Image Super-Resolution Iris Recognition

Super-Resolution and Image Re-projection for Iris Recognition

no code implementations20 Oct 2022 Eduardo Ribeiro, Andreas Uhl, Fernando Alonso-Fernandez

Several recent works have addressed the ability of deep learning to disclose rich, hierarchical and discriminative models for the most diverse purposes.

Iris Recognition Super-Resolution +1

FaceDancer: Pose- and Occlusion-Aware High Fidelity Face Swapping

1 code implementation19 Oct 2022 Felix Rosberg, Eren Erdal Aksoy, Fernando Alonso-Fernandez, Cristofer Englund

In this work, we present a new single-stage method for subject agnostic face swapping and identity transfer, named FaceDancer.

Attribute Face Swapping +1

Deep Learning for Iris Recognition: A Survey

no code implementations12 Oct 2022 Kien Nguyen, Hugo Proença, Fernando Alonso-Fernandez

In this survey, we provide a comprehensive review of more than 200 papers, technical reports, and GitHub repositories published over the last 10 years on the recent developments of deep learning techniques for iris recognition, covering broad topics on algorithm designs, open-source tools, open challenges, and emerging research.

Iris Recognition

A review of schemes for fingerprint image quality computation

no code implementations12 Jul 2022 Fernando Alonso-Fernandez, Julian Fierrez-Aguilar, Javier Ortega-Garcia

Fingerprint image quality affects heavily the performance of fingerprint recognition systems.

Fingerprint Liveness Detection Based on Quality Measures

no code implementations11 Jul 2022 Javier Galbally, Fernando Alonso-Fernandez, Julian Fierrez, Javier Ortega-Garcia

A new fingerprint parameterization for liveness detection based on quality measures is presented.

Drone Detection and Tracking in Real-Time by Fusion of Different Sensing Modalities

no code implementations5 Jul 2022 Fredrik Svanström, Fernando Alonso-Fernandez, Cristofer Englund

In conjunction with standard video cameras and microphone sensors, we explore the use of thermal infrared cameras, pointed out as a feasible and promising solution that is scarcely addressed in the related literature.

Sensor Fusion

Super-Resolution for Selfie Biometrics: Introduction and Application to Face and Iris

no code implementations12 Apr 2022 Fernando Alonso-Fernandez, Reuben A. Farrugia, Julian Fierrez, Josef Bigun

Such techniques are designed to restore generic images and therefore do not exploit the specific structure found in biometric images (e. g. iris or faces), which causes the solution to be sub-optimal.

Super-Resolution

Continuous Examination by Automatic Quiz Assessment Using Spiral Codes and Image Processing

no code implementations26 Jan 2022 Fernando Alonso-Fernandez, Josef Bigun

We describe a technical solution implemented at Halmstad University to automatise assessment and reporting of results of paper-based quiz exams.

Writer Recognition Using Off-line Handwritten Single Block Characters

no code implementations25 Jan 2022 Adrian Leo Hagström, Rustam Stanikzai, Josef Bigun, Fernando Alonso-Fernandez

With ten enrolment samples, the Top-1 accuracy with deep features is around 94%, and reaches nearly 100% by Top-10.

Quality Measures in Biometric Systems

no code implementations17 Nov 2021 Fernando Alonso-Fernandez, Julian Fierrez, Javier Ortega-Garcia

Biometric technology has been increasingly deployed in the past decade, offering greater security and convenience than traditional methods of personal recognition.

Benchmarking Quality-Dependent and Cost-Sensitive Score-Level Multimodal Biometric Fusion Algorithms

no code implementations17 Nov 2021 Norman Poh, Thirimachos Bourlai, Josef Kittler, Lorene Allano, Fernando Alonso-Fernandez, Onkar Ambekar, John Baker, Bernadette Dorizzi, Omolara Fatukasi, Julian Fierrez, Harald Ganster, Javier Ortega-Garcia, Donald Maurer, Albert Ali Salah, Tobias Scheidat, Claus Vielhauer

The cost-sensitive evaluation, on the other hand, investigates how well a fusion algorithm can perform given restricted computation and in the presence of software and hardware failures, resulting in errors such as failure-to-acquire and failure-to-match.

Benchmarking

A dataset for multi-sensor drone detection

no code implementations2 Nov 2021 Fredrik Svanström, Fernando Alonso-Fernandez, Cristofer Englund

To counteract the mentioned issues and allow fundamental studies with a common public benchmark, we contribute with an annotated multi-sensor database for drone detection that includes infrared and visible videos and audio files.

Sensor Fusion

A high performance fingerprint liveness detection method based on quality related features

no code implementations2 Nov 2021 Javier Galbally, Fernando Alonso-Fernandez, Julian Fierrez, Javier Ortega-Garcia

A new software-based liveness detection approach using a novel fingerprint parameterization based on quality related features is proposed.

Iris Recognition Based on SIFT Features

no code implementations30 Oct 2021 Fernando Alonso-Fernandez, Pedro Tome-Gonzalez, Virginia Ruiz-Albacete, Javier Ortega-Garcia

We extract characteristic SIFT feature points in scale space and perform matching based on the texture information around the feature points using the SIFT operator.

Iris Recognition

Classification of PS and ABS Black Plastics for WEEE Recycling Applications

no code implementations20 Oct 2021 Anton Persson, Niklas Dymne, Fernando Alonso-Fernandez

This work is aimed at creating a system that can classify different types of plastics by using picture analysis, in particular, black plastics of the type Polystyrene (PS) and Acrylonitrile Butadiene Styrene (ABS).

On the Effect of Selfie Beautification Filters on Face Detection and Recognition

no code implementations17 Oct 2021 Pontus Hedman, Vasilios Skepetzis, Kevin Hernandez-Diaz, Josef Bigun, Fernando Alonso-Fernandez

Although there is room for improvement, when neither U-NET reconstruction nor training with filtered images is applied, the accuracy with filters that severely occlude the eye is <72% (identification) and >12% (EER)

Face Detection

In-Bed Person Monitoring Using Thermal Infrared Sensors

no code implementations16 Jul 2021 Elias Josse, Amanda Nerborg, Kevin Hernandez-Diaz, Fernando Alonso-Fernandez

The world is expecting an aging population and shortage of healthcare professionals.

AI perspectives in Smart Cities and Communities to enable road vehicle automation and smart traffic control

no code implementations7 Apr 2021 Cristofer Englund, Eren Erdal Aksoy, Fernando Alonso-Fernandez, Martin Daniel Cooney, Sepideh Pashami, Bjorn Astrand

This paper describes AI perspectives in SCC and gives an overview of AI-based technologies used in traffic to enable road vehicle automation and smart traffic control.

Cross-Spectral Periocular Recognition with Conditional Adversarial Networks

no code implementations26 Aug 2020 Kevin Hernandez-Diaz, Fernando Alonso-Fernandez, Josef Bigun

Recognition experiments are done using a number of off-the-shelf periocular comparators based both on hand-crafted features and CNN descriptors.

Writer Identification Using Microblogging Texts for Social Media Forensics

no code implementations31 Jul 2020 Fernando Alonso-Fernandez, Nicole Mariah Sharon Belvisi, Kevin Hernandez-Diaz, Naveed Muhammad, Josef Bigun

With a large number of training Tweets (>500), a good accuracy (Rank-5>80%) is achievable with only a few dozens of test Tweets, even with several thousands of authors.

SqueezeFacePoseNet: Lightweight Face Verification Across Different Poses for Mobile Platforms

no code implementations16 Jul 2020 Fernando Alonso-Fernandez, Javier Barrachina, Kevin Hernandez-Diaz, Josef Bigun

Accordingly, we address the challenge of developing a lightweight face recognition network of just a few megabytes that can operate with sufficient accuracy in comparison to much larger models.

Face Verification Lightweight Face Recognition

Real-Time Drone Detection and Tracking With Visible, Thermal and Acoustic Sensors

1 code implementation14 Jul 2020 Fredrik Svanstrom, Cristofer Englund, Fernando Alonso-Fernandez

Besides the common video and audio sensors, the system also includes a thermal infrared camera, which is shown to be a feasible solution to the drone detection task.

Sensor Fusion

Analytic Signal Phase in $N-D$ by Linear Symmetry Tensor--fingerprint modeling

no code implementations16 May 2020 Josef Bigun, Fernando Alonso-Fernandez

To that end, a novel multi-scale minutia model where location, direction, and scale of minutia parameters are steerable, without the creation of uncontrollable minutia is also presented.

Disparity Estimation Optical Flow Estimation

Detection and Classification of Industrial Signal Lights for Factory Floors

no code implementations23 Apr 2020 Felix Nilsson, Jens Jakobsen, Fernando Alonso-Fernandez

Accordingly, the goal is to develop a solution which can measure the operational state using the input from a video camera capturing a factory floor.

Classification General Classification

Cloud-Based Face and Speech Recognition for Access Control Applications

no code implementations23 Apr 2020 Nathalie Tkauc, Thao Tran, Kevin Hernandez-Diaz, Fernando Alonso-Fernandez

This paper describes the implementation of a system to recognize employees and visitors wanting to gain access to a physical office through face images and speech-to-text recognition.

Face Recognition speech-recognition +2

Spectrum Translation for Cross-Spectral Ocular Matching

no code implementations14 Feb 2020 Kevin Hernandez Diaz, Fernando Alonso-Fernandez, Josef Bigun

Cross-spectral verification remains a big issue in biometrics, especially for the ocular area due to differences in the reflected features in the images depending on the region and spectrum used.

Translation

Improving Automated Latent Fingerprint Identification using Extended Minutia Types

no code implementations23 Oct 2018 Ram P. Krish, Julian Fierrez, Daniel Ramos, Fernando Alonso-Fernandez, Josef Bigun

We report significant improvements in the rank identification accuracies when these minutiae matchers are augmented with our proposed algorithm based on rare minutiae features.

Action and intention recognition of pedestrians in urban traffic

no code implementations23 Oct 2018 Dimitrios Varytimidis, Fernando Alonso-Fernandez, Boris Duran, Cristofer Englund

Action and intention recognition of pedestrians in urban settings are challenging problems for Advanced Driver Assistance Systems as well as future autonomous vehicles to maintain smooth and safe traffic.

Autonomous Driving Intent Detection +1

Fruit and Vegetable Identification Using Machine Learning for Retail Applications

1 code implementation23 Oct 2018 Frida Femling, Adam Olsson, Fernando Alonso-Fernandez

This paper describes an approach of creating a system identifying fruit and vegetables in the retail market using images captured with a video camera attached to the system.

BIG-bench Machine Learning

A Survey on Periocular Biometrics Research

no code implementations8 Oct 2018 Fernando Alonso-Fernandez, Josef Bigun

Periocular refers to the facial region in the vicinity of the eye, including eyelids, lashes and eyebrows.

Periocular Recognition Using CNN Features Off-the-Shelf

no code implementations17 Sep 2018 Kevin Hernandez-Diaz, Fernando Alonso-Fernandez, Josef Bigun

Periocular refers to the region around the eye, including sclera, eyelids, lashes, brows and skin.

Object Recognition

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