Biometrics and Machine Learning Group
Latest news
February 2025: conference proceedings - Rasel Ahmed Bhuiyan, Mateusz Trokielewicz, Piotr Maciejewicz, Sherri Bucher, Adam Czajka. "Iris Recognition for Infants" Proceedings of the Winter Conference on Applications of Computer Vision (WACV) Workshops, February 2025, pp. 83-92.
December 2024: journal papers - Mateusz Trokielewicz, Piotr Maciejewicz, Adam Czajka. "Post-mortem iris biometrics – Field, applications and methods." Forensic Science International, Volume 365, 2024, Article 112293. ISSN 0379-0738. https://doi.org/10.1016/j .forsciint.2024.112293.
April 2024: journal papers - Adrian Kordas, Ewelina Bartuzi-Trokielewicz, Michał Ołowski, Mateusz Trokielewicz, "Synthetic Iris Images: A Comparative Analysis between Cartesian and Polar Representation" 2024, Sensors, 24(7), 2269, https://doi.org/10.3390/ s24072269
We are pleased to announce that Weronika Gutfeter defended her doctoral dissertation on face recognition based on multi-shot images using deep aggregation networks, supervised by prof. Andrzej Pacut, on the 18th of May, 2023.
Unconstrained ear recognition

The high performance of deep neural networks approaches in the image and the face classification task led us to propose a solution crafted to ear identification defined by the authors of Unconstrained Ear Recognition Challenge 2019. As in this particular case it was necessary to deal with the unconstrained data matching in the open-set scenario we employed the siamese network in its core. We propose a hybrid loss function that consists of a classification-learning component (based on cross-entropy loss function) and a distance-learning component (contrastive loss function). The novelty of our approach lays in the concept of training the first function with respect to object-dependent features (specific to ear) and the second part with respect to the user (features specific to person).
Detailed description in papers:
- Žiga Emeršič, Aruna Kumar S. V., B. S. Harish, Weronika Gutfeter, Jalil Nourmohammadi Khiarak, Andrzej Pacut, Earnest Hansley, Mauricio Pamplona Segundo, Sudeep Sarkar, Hyeonjung Park, Gi Pyo Nam, Ig-Jae Kim, Sagar G. Sangodkar, Ümit Kaçar, Murvet Kirci, Li Yuan, Jishou Yuan, Haonan Zhao, Fei Lu, Junying Mao, Xiaoshuang Zhang, Dogucan Yaman, Fevziye Irem Eyiokur, Kadir Bulut Özler, Hazım Kemal Ekenel, Debbrota Paul Chowdhury, Sambit Bakshi, Pankaj K. Sa, Banshidhar Majhi, Peter Peer, Vitomir Štruc The Unconstrained Ear Recognition Challenge 2019, CoRR, abs/1903.04143, 2019
-
J. Nourmohammadi-Khiarak and A. Pacut. An ear anti-spoofing database with various attacks, In 2018 International
Carnahan Conference on Security Technology (ICCST), pages 1–5, Oct 2018.