Search Results for author: Josef Bigun

Found 17 papers, 1 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.

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.

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

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

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

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.

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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