Search Results for author: Fernando Alonso-Fernandez

Found 34 papers, 2 papers with code

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.


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.

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.

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 Recognition Face Verification

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.

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 +1

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.


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

no code implementations23 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.

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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