Search Results for author: Juan Tapia

Found 25 papers, 5 papers with code

Impact of Synthetic Images on Morphing Attack Detection Using a Siamese Network

no code implementations14 Mar 2024 Juan Tapia, Christoph Busch

Our results show that MAD trained on EfficientNetB0 from FERET, FRGCv2, and FRLL can reach a lower error rate in comparison with SOTA.

Double Trouble? Impact and Detection of Duplicates in Face Image Datasets

1 code implementation25 Jan 2024 Torsten Schlett, Christian Rathgeb, Juan Tapia, Christoph Busch

Additional steps based on face recognition and face image quality assessment models reduce false positives, and facilitate the deduplication of the face images both for intra- and inter-subject duplicate sets.

Face Image Quality Face Image Quality Assessment +1

Iris Liveness Detection Competition (LivDet-Iris) -- The 2023 Edition

no code implementations6 Oct 2023 Patrick Tinsley, Sandip Purnapatra, Mahsa Mitcheff, Aidan Boyd, Colton Crum, Kevin Bowyer, Patrick Flynn, Stephanie Schuckers, Adam Czajka, Meiling Fang, Naser Damer, Xingyu Liu, Caiyong Wang, Xianyun Sun, Zhaohua Chang, Xinyue Li, Guangzhe Zhao, Juan Tapia, Christoph Busch, Carlos Aravena, Daniel Schulz

New elements in this fifth competition include (1) GAN-generated iris images as a category of presentation attack instruments (PAI), and (2) an evaluation of human accuracy at detecting PAI as a reference benchmark.

Towards minimizing efforts for Morphing Attacks -- Deep embeddings for morphing pair selection and improved Morphing Attack Detection

no code implementations29 May 2023 Roman Kessler, Kiran Raja, Juan Tapia, Christoph Busch

The results endorse the advantages of face embeddings in more effective image pre-selection for face morphing and accurate detection of morphed face images.

Face Recognition

Face Feature Visualisation of Single Morphing Attack Detection

no code implementations25 Apr 2023 Juan Tapia, Christoph Busch

This paper proposes an explainable visualisation of different face feature extraction algorithms that enable the detection of bona fide and morphing images for single morphing attack detection.

Considerations on the Evaluation of Biometric Quality Assessment Algorithms

1 code implementation23 Mar 2023 Torsten Schlett, Christian Rathgeb, Juan Tapia, Christoph Busch

Additionally, a discard fraction limit or range must be selected to compute pAUC values, which can then be used to quantitatively rank quality assessment algorithms.

Face Image Quality Face Image Quality Assessment +1

Effect of Lossy Compression Algorithms on Face Image Quality and Recognition

no code implementations24 Feb 2023 Torsten Schlett, Sebastian Schachner, Christian Rathgeb, Juan Tapia, Christoph Busch

This work investigates the effect of lossy image compression on a state-of-the-art face recognition model, and on multiple face image quality assessment models.

Face Image Quality Face Image Quality Assessment +2

Improving Presentation Attack Detection for ID Cards on Remote Verification Systems

no code implementations23 Jan 2023 Sebastian Gonzalez, Juan Tapia

In this paper, an updated two-stage, end-to-end Presentation Attack Detection method for remote biometric verification systems of ID cards, based on MobileNetV2, is presented.

Learning to Predict Fitness for Duty using Near Infrared Periocular Iris Images

no code implementations4 Sep 2022 Juan Tapia, Daniel Benalcazar, Andres Valenzuela, Leonardo Causa, Enrique Lopez Droguett, Christoph Busch

This research proposes a new database and method to detect the reduction of alertness conditions due to alcohol, drug consumption and sleepiness deprivation from Near-Infra-Red (NIR) periocular eye images.

Alcohol Consumption Detection from Periocular NIR Images Using Capsule Network

1 code implementation4 Sep 2022 Juan Tapia, Enrique Lopez Droguett, Christoph Busch

This research proposes a method to detect alcohol consumption from Near-Infra-Red (NIR) periocular eye images.

Single Morphing Attack Detection using Siamese Network and Few-shot Learning

no code implementations22 Jun 2022 Juan Tapia, Daniel Schulz, Christoph Busch

This paper proposes a framework following the Few-Shot-Learning approach that shares image information based on the siamese network using triplet-semi-hard-loss to tackle the morphing attack detection and boost the clustering classification process.

Face Morphing Attack Detection Face Verification +1

A Novel Capsule Neural Network Based Model for Drowsiness Detection Using Electroencephalography Signals

no code implementations4 Apr 2022 Luis Guarda, Juan Tapia, Enrique Lopez Droguett, Marcelo Ramos

Due to the transient mental state of a human subject between alertness and drowsiness, automated drowsiness detection is a complex problem to tackle.

Towards an Efficient Semantic Segmentation Method of ID Cards for Verification Systems

no code implementations24 Nov 2021 Rodrigo Lara, Andres Valenzuela, Daniel Schulz, Juan Tapia, Christoph Busch

The best results for the fused multi-country dataset of ID Card images from Chile, Argentina and Mexico reached an IoU of 0. 9911.

Semantic Segmentation

Synthetic Periocular Iris PAI from a Small Set of Near-Infrared-Images

no code implementations26 Jul 2021 Jose Maureira, Juan Tapia, Claudia Arellano, Christoph Busch

Such results demonstrated the feasibility of synthetic images to fool presentation attacks detection algorithms and the need for such algorithms to be constantly updated and trained with a larger number of images and PAI scenarios.

Iris Liveness Detection using a Cascade of Dedicated Deep Learning Networks

no code implementations28 May 2021 Juan Tapia, Sebastian Gonzalez, Christoph Busch

The bona fide class consists of live iris images, whereas the attack presentation instrument classes are comprised of cadaver, printed, and contact lenses images, for a total of four scenarios.

Selfie Periocular Verification using an Efficient Super-Resolution Approach

no code implementations16 Feb 2021 Juan Tapia, Andres Valenzuela, Rodrigo Lara, Marta Gomez-Barrero, Christoph Busch

Selfie-based biometrics has great potential for a wide range of applications since, e. g. periocular verification is contactless and is safe to use in pandemics such as COVID-19, when a major portion of a face is covered by a facial mask.

Image Super-Resolution

Sex-Prediction from Periocular Images across Multiple Sensors and Spectra

no code implementations1 May 2019 Juan Tapia, Christian Rathgeb, Christoph Busch

In this paper, we provide a comprehensive analysis of periocular-based sex-prediction (commonly referred to as gender classification) using state-of-the-art machine learning techniques.

Classification Gender Classification +1

Gender Classification from Iris Texture Images Using a New Set of Binary Statistical Image Features

1 code implementation1 May 2019 Juan Tapia, Claudia Arellano

This paper explores the use of a Binary Statistical Features (BSIF) algorithm for classifying gender from iris texture images captured with NIR sensors.

Classification Gender Classification +3

Relevant features for Gender Classification in NIR Periocular Images

no code implementations26 Apr 2019 Ignacio Viedma, Juan Tapia, Andres Iturriaga, Christoph Busch

In this work, we analyze and demonstrate the location of the most relevant features that describe gender in periocular NIR images and evaluate its influence its classification.

Classification Gender Classification +1

Sex-Classification from Cell-Phones Periocular Iris Images

no code implementations31 Dec 2018 Juan Tapia, Claudia Arellano, Ignacio Viedma

These results compare well with the state of the art and show that when improving image resolution with the SRCNN the sex-classification rate increases.

Classification General Classification +2

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