Search Results for author: Josef Bigun

Found 33 papers, 2 papers with code

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

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.

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.

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

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

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

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.

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.

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

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.

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.

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

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

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.

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

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

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.

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

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.

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

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

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

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.

Cannot find the paper you are looking for? You can Submit a new open access paper.