Search Results for author: Ruben Tolosana

Found 54 papers, 23 papers with code

Is my Data in your AI Model? Membership Inference Test with Application to Face Images

no code implementations14 Feb 2024 Daniel DeAlcala, Aythami Morales, Gonzalo Mancera, Julian Fierrez, Ruben Tolosana, Javier Ortega-Garcia

This paper introduces the Membership Inference Test (MINT), a novel approach that aims to empirically assess if specific data was used during the training of Artificial Intelligence (AI) models.

Face Recognition Test

IEEE BigData 2023 Keystroke Verification Challenge (KVC)

1 code implementation29 Jan 2024 Giuseppe Stragapede, Ruben Vera-Rodriguez, Ruben Tolosana, Aythami Morales, Ivan DeAndres-Tame, Naser Damer, Julian Fierrez, Javier-Ortega Garcia, Nahuel Gonzalez, Andrei Shadrikov, Dmitrii Gordin, Leon Schmitt, Daniel Wimmer, Christoph Grossmann, Joerdis Krieger, Florian Heinz, Ron Krestel, Christoffer Mayer, Simon Haberl, Helena Gschrey, Yosuke Yamagishi, Sanjay Saha, Sanka Rasnayaka, Sandareka Wickramanayake, Terence Sim, Weronika Gutfeter, Adam Baran, Mateusz Krzyszton, Przemyslaw Jaskola

Several neural architectures were proposed by the participants, leading to global Equal Error Rates (EERs) as low as 3. 33% and 3. 61% achieved by the best team respectively in the desktop and mobile scenario, outperforming the current state of the art biometric verification performance for KD.

Keystroke Verification Challenge (KVC): Biometric and Fairness Benchmark Evaluation

no code implementations10 Nov 2023 Giuseppe Stragapede, Ruben Vera-Rodriguez, Ruben Tolosana, Aythami Morales, Naser Damer, Julian Fierrez, Javier Ortega-Garcia

Analyzing keystroke dynamics (KD) for biometric verification has several advantages: it is among the most discriminative behavioral traits; keyboards are among the most common human-computer interfaces, being the primary means for users to enter textual data; its acquisition does not require additional hardware, and its processing is relatively lightweight; and it allows for transparently recognizing subjects.


mEBAL2 Database and Benchmark: Image-based Multispectral Eyeblink Detection

1 code implementation14 Sep 2023 Roberto Daza, Aythami Morales, Julian Fierrez, Ruben Tolosana, Ruben Vera-Rodriguez

This work introduces a new multispectral database and novel approaches for eyeblink detection in RGB and Near-Infrared (NIR) individual images.

EEG Electroencephalogram (EEG)

AI4Food-NutritionFW: A Novel Framework for the Automatic Synthesis and Analysis of Eating Behaviours

1 code implementation12 Sep 2023 Sergio Romero-Tapiador, Ruben Tolosana, Aythami Morales, Isabel Espinosa-Salinas, Gala Freixer, Julian Fierrez, Ruben Vera-Rodriguez, Enrique Carrillo de Santa Pau, Ana Ramírez de Molina, Javier Ortega-Garcia

In addition to the framework, we also provide and describe a unique food image dataset that includes 4, 800 different weekly eating behaviours from 15 different profiles and 1, 200 subjects.


CareFall: Automatic Fall Detection through Wearable Devices and AI Methods

no code implementations11 Jul 2023 Juan Carlos Ruiz-Garcia, Ruben Tolosana, Ruben Vera-Rodriguez, Carlos Moro

The aging population has led to a growing number of falls in our society, affecting global public health worldwide.


GANDiffFace: Controllable Generation of Synthetic Datasets for Face Recognition with Realistic Variations

no code implementations31 May 2023 Pietro Melzi, Christian Rathgeb, Ruben Tolosana, Ruben Vera-Rodriguez, Dominik Lawatsch, Florian Domin, Maxim Schaubert

We generate multiple synthetic datasets by changing GANDiffFace settings, and compare their mated and non-mated score distributions with the distributions provided by popular real-world datasets for face recognition, i. e. VGG2 and IJB-C. Our results show the feasibility of the proposed GANDiffFace, in particular the use of Diffusion models to enhance the (limited) intra-class variations provided by GANs towards the level of real-world datasets.

Face Recognition

Combining Blockchain and Biometrics: A Survey on Technical Aspects and a First Legal Analysis

no code implementations21 Feb 2023 Mahdi Ghafourian, Bilgesu Sumer, Ruben Vera-Rodriguez, Julian Fierrez, Ruben Tolosana, Aythami Moralez, Els Kindt

Meanwhile, blockchain, the very attractive decentralized ledger technology, has been widely received both by the research and industry in the past years and it is being increasingly deployed nowadays in many different applications, such as money transfer, IoT, healthcare, or logistics.

Introduction to Presentation Attacks in Signature Biometrics and Recent Advances

no code implementations16 Feb 2023 Carlos Gonzalez-Garcia, Ruben Tolosana, Ruben Vera-Rodriguez, Julian Fierrez, Javier Ortega-Garcia

Applications based on biometric authentication have received a lot of interest in the last years due to the breathtaking results obtained using personal traits such as face or fingerprint.

TypeFormer: Transformers for Mobile Keystroke Biometrics

1 code implementation26 Dec 2022 Giuseppe Stragapede, Paula Delgado-Santos, Ruben Tolosana, Ruben Vera-Rodriguez, Richard Guest, Aythami Morales

The broad usage of mobile devices nowadays, the sensitiveness of the information contained in them, and the shortcomings of current mobile user authentication methods are calling for novel, secure, and unobtrusive solutions to verify the users' identity.

BeCAPTCHA-Type: Biometric Keystroke Data Generation for Improved Bot Detection

no code implementations27 Jul 2022 Daniel DeAlcala, Aythami Morales, Ruben Tolosana, Alejandro Acien, Julian Fierrez, Santiago Hernandez, Miguel A. Ferrer, Moises Diaz

Different bot detectors are considered based on several supervised classifiers (Support Vector Machine, Random Forest, Gaussian Naive Bayes and a Long Short-Term Memory network) and a learning framework including human and synthetic samples.

Few-Shot Learning Vocal Bursts Type Prediction

Mobile Keystroke Biometrics Using Transformers

1 code implementation15 Jul 2022 Giuseppe Stragapede, Paula Delgado-Santos, Ruben Tolosana, Ruben Vera-Rodriguez, Richard Guest, Aythami Morales

One of the most popular traits in the literature is keystroke dynamics due to the large deployment of computers and mobile devices in our society.

An Overview of Privacy-enhancing Technologies in Biometric Recognition

no code implementations21 Jun 2022 Pietro Melzi, Christian Rathgeb, Ruben Tolosana, Ruben Vera-Rodriguez, Christoph Busch

Privacy-enhancing technologies are technologies that implement fundamental data protection principles.

BehavePassDB: Public Database for Mobile Behavioral Biometrics and Benchmark Evaluation

1 code implementation6 Jun 2022 Giuseppe Stragapede, Ruben Vera-Rodriguez, Ruben Tolosana, Aythami Morales

Mobile behavioral biometrics have become a popular topic of research, reaching promising results in terms of authentication, exploiting a multimodal combination of touchscreen and background sensor data.

Exploring Transformers for Behavioural Biometrics: A Case Study in Gait Recognition

no code implementations3 Jun 2022 Paula Delgado-Santos, Ruben Tolosana, Richard Guest, Farzin Deravi, Ruben Vera-Rodriguez

Biometrics on mobile devices has attracted a lot of attention in recent years as it is considered a user-friendly authentication method.

Gait Recognition

BioTouchPass: Handwritten Passwords for Touchscreen Biometrics

1 code implementation3 May 2022 Ruben Tolosana, Ruben Vera-Rodriguez, Julian Fierrez

A complete analysis of our proposed biometric system is carried out regarding the discriminative power of each handwritten digit and the robustness when increasing the length of the password and the number of enrolment samples.

Biometric Signature Verification Using Recurrent Neural Networks

no code implementations3 May 2022 Ruben Tolosana, Ruben Vera-Rodriguez, Julian Fierrez, Javier Ortega-Garcia

Architectures based on Recurrent Neural Networks (RNNs) have been successfully applied to many different tasks such as speech or handwriting recognition with state-of-the-art results.

Handwriting Recognition

ECG Biometric Recognition: Review, System Proposal, and Benchmark Evaluation

1 code implementation8 Apr 2022 Pietro Melzi, Ruben Tolosana, Ruben Vera-Rodriguez

In this study, we perform extensive analysis and comparison of different scenarios in ECG biometric recognition.

ChildCI Framework: Analysis of Motor and Cognitive Development in Children-Computer Interaction for Age Detection

no code implementations8 Apr 2022 Juan Carlos Ruiz-Garcia, Ruben Tolosana, Ruben Vera-Rodriguez, Julian Fierrez, Jaime Herreros-Rodriguez

This article presents a comprehensive analysis of the different tests proposed in the recent ChildCI framework, proving its potential for generating a better understanding of children's neuromotor and cognitive development along time, as well as their possible application in other research areas such as e-Health and e-Learning.


Mobile Behavioral Biometrics for Passive Authentication

no code implementations14 Mar 2022 Giuseppe Stragapede, Ruben Vera-Rodriguez, Ruben Tolosana, Aythami Morales, Alejandro Acien, Gael Le Lan

Current mobile user authentication systems based on PIN codes, fingerprint, and face recognition have several shortcomings.

Face Recognition

Handwriting Biometrics: Applications and Future Trends in e-Security and e-Health

no code implementations24 Feb 2022 Marcos Faundez-Zanuy, Julian Fierrez, Miguel A. Ferrer, Moises Diaz, Ruben Tolosana, Réjean Plamondon

Background- This paper summarizes the state-of-the-art and applications based on online handwritting signals with special emphasis on e-security and e-health fields.

ALEBk: Feasibility Study of Attention Level Estimation via Blink Detection applied to e-Learning

no code implementations16 Dec 2021 Roberto Daza, Daniel DeAlcala, Aythami Morales, Ruben Tolosana, Ruth Cobos, Julian Fierrez

The experimental framework is carried out using a public multimodal database for eye blink detection and attention level estimation called mEBAL, which comprises data from 38 students and multiples acquisition sensors, in particular, i) an electroencephalogram (EEG) band which provides the time signals coming from the student's cognitive information, and ii) RGB and NIR cameras to capture the students face gestures.

EEG Electroencephalogram (EEG)

GaitPrivacyON: Privacy-Preserving Mobile Gait Biometrics using Unsupervised Learning

no code implementations8 Oct 2021 Paula Delgado-Santos, Ruben Tolosana, Richard Guest, Ruben Vera, Farzin Deravi, Aythami Morales

This study proposes GaitPrivacyON, a novel mobile gait biometrics verification approach that provides accurate authentication results while preserving the sensitive information of the subject.

Privacy Preserving

SetMargin Loss applied to Deep Keystroke Biometrics with Circle Packing Interpretation

no code implementations2 Sep 2021 Aythami Morales, Julian Fierrez, Alejandro Acien, Ruben Tolosana, Ignacio Serna

This work presents a new deep learning approach for keystroke biometrics based on a novel Distance Metric Learning method (DML).

Metric Learning

SVC-onGoing: Signature Verification Competition

1 code implementation13 Aug 2021 Ruben Tolosana, Ruben Vera-Rodriguez, Carlos Gonzalez-Garcia, Julian Fierrez, Aythami Morales, Javier Ortega-Garcia, Juan Carlos Ruiz-Garcia, Sergio Romero-Tapiador, Santiago Rengifo, Miguel Caruana, Jiajia Jiang, Songxuan Lai, Lianwen Jin, Yecheng Zhu, Javier Galbally, Moises Diaz, Miguel Angel Ferrer, Marta Gomez-Barrero, Ilya Hodashinsky, Konstantin Sarin, Artem Slezkin, Marina Bardamova, Mikhail Svetlakov, Mohammad Saleem, Cintia Lia Szucs, Bence Kovari, Falk Pulsmeyer, Mohamad Wehbi, Dario Zanca, Sumaiya Ahmad, Sarthak Mishra, Suraiya Jabin

This article presents SVC-onGoing, an on-going competition for on-line signature verification where researchers can easily benchmark their systems against the state of the art in an open common platform using large-scale public databases, such as DeepSignDB and SVC2021_EvalDB, and standard experimental protocols.

Task 2

Child-Computer Interaction with Mobile Devices: Recent Works, New Dataset, and Age Detection

no code implementations2 Feb 2021 Ruben Tolosana, Juan Carlos Ruiz-Garcia, Ruben Vera-Rodriguez, Jaime Herreros-Rodriguez, Sergio Romero-Tapiador, Aythami Morales, Julian Fierrez

This article provides an overview of recent research in Child-Computer Interaction with mobile devices and describe our framework ChildCI intended for: i) overcoming the lack of large-scale publicly available databases in the area, ii) generating a better understanding of the cognitive and neuromotor development of children along time, contrary to most previous studies in the literature focused on a single-session acquisition, and iii) enabling new applications in e-Learning and e-Health through the acquisition of additional information such as the school grades and children's disorders, among others.

DeepWriteSYN: On-Line Handwriting Synthesis via Deep Short-Term Representations

no code implementations14 Sep 2020 Ruben Tolosana, Paula Delgado-Santos, Andres Perez-Uribe, Ruben Vera-Rodriguez, Julian Fierrez, Aythami Morales

These two properties give a lot of flexibility to our synthesiser, e. g., as shown in our experiments, DeepWriteSYN can generate realistic handwriting variations of a given handwritten structure corresponding to the natural variation within a given population or a given subject.

Handwriting generation One-Shot Learning

DeepFakes Evolution: Analysis of Facial Regions and Fake Detection Performance

no code implementations16 Apr 2020 Ruben Tolosana, Sergio Romero-Tapiador, Julian Fierrez, Ruben Vera-Rodriguez

Media forensics has attracted a lot of attention in the last years in part due to the increasing concerns around DeepFakes.

Face Swapping

Blockchain in the Internet of Things: Architectures and Implementation

no code implementations13 Apr 2020 Oscar Delgado-Mohatar, Ruben Tolosana, Julian Fierrez, Aythami Morales

The world is becoming more interconnected every day.

Cryptography and Security Computers and Society

Blockchain meets Biometrics: Concepts, Application to Template Protection, and Trends

1 code implementation19 Mar 2020 Oscar Delgado-Mohatar, Julian Fierrez, Ruben Tolosana, Ruben Vera-Rodriguez

Blockchain technologies provide excellent architectures and practical tools for securing and managing the sensitive and private data stored in biometric templates, but at a cost.

DeepSign: Deep On-Line Signature Verification

1 code implementation24 Feb 2020 Ruben Tolosana, Ruben Vera-Rodriguez, Julian Fierrez, Javier Ortega-Garcia

Deep learning has become a breathtaking technology in the last years, overcoming traditional handcrafted approaches and even humans for many different tasks.

Dynamic Time Warping Test

BioTouchPass2: Touchscreen Password Biometrics Using Time-Aligned Recurrent Neural Networks

1 code implementation28 Jan 2020 Ruben Tolosana, Ruben Vera-Rodriguez, Julian Fierrez, Javier Ortega-Garcia

ii) We perform a complete analysis of the proposed approach considering both traditional authentication systems such as Dynamic Time Warping (DTW) and novel approaches based on Recurrent Neural Networks (RNNs).

Dynamic Time Warping

DeepFakes and Beyond: A Survey of Face Manipulation and Fake Detection

2 code implementations1 Jan 2020 Ruben Tolosana, Ruben Vera-Rodriguez, Julian Fierrez, Aythami Morales, Javier Ortega-Garcia

The free access to large-scale public databases, together with the fast progress of deep learning techniques, in particular Generative Adversarial Networks, have led to the generation of very realistic fake content with its corresponding implications towards society in this era of fake news.

Attribute DeepFake Detection +2

GANprintR: Improved Fakes and Evaluation of the State of the Art in Face Manipulation Detection

2 code implementations13 Nov 2019 João C. Neves, Ruben Tolosana, Ruben Vera-Rodriguez, Vasco Lopes, Hugo Proença, Julian Fierrez

The availability of large-scale facial databases, together with the remarkable progresses of deep learning technologies, in particular Generative Adversarial Networks (GANs), have led to the generation of extremely realistic fake facial content, raising obvious concerns about the potential for misuse.

Face Generation Steganalysis

Biometric Template Storage with Blockchain: A First Look into Cost and Performance Tradeoffs

no code implementations30 Apr 2019 Oscar Delgado-Mohatar, Julian Fierrez, Ruben Tolosana, Ruben Vera-Rodriguez

We explore practical tradeoffs in blockchain-based biometric template storage.

Cryptography and Security

Biometric Presentation Attack Detection: Beyond the Visible Spectrum

no code implementations28 Feb 2019 Ruben Tolosana, Marta Gomez-Barrero, Christoph Busch, Javier Ortega-Garcia

The increased need for unattended authentication in multiple scenarios has motivated a wide deployment of biometric systems in the last few years.

SensitiveNets: Learning Agnostic Representations with Application to Face Images

1 code implementation1 Feb 2019 Aythami Morales, Julian Fierrez, Ruben Vera-Rodriguez, Ruben Tolosana

Our method is based on an adversarial regularizer that introduces a sensitive information removal function in the learning objective.

Face Recognition Fairness +2

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