| 355 | -- | 358 | Ana F. Sequeira, Marta Gomez-Barrero, Naser Damer, Paulo Lobato Correia. BIOSIG 2021 Special issue on efficient, reliable, and privacy-friendly biometrics |
| 359 | -- | 382 | Biying Fu, Naser Damer. Face morphing attacks and face image quality: The effect of morphing and the unsupervised attack detection by quality |
| 383 | -- | 395 | Raghavendra Mudgalgundurao, Patrick Schuch, Kiran B. Raja, Raghavendra Ramachandra, Naser Damer. Pixel-wise supervision for presentation attack detection on identity document cards |
| 396 | -- | 406 | Alperen Kantarci, Hasan Dertli, Hazim Kemal Ekenel. Deep patch-wise supervision for presentation attack detection |
| 407 | -- | 419 | Zohra Rezgui, Amina Bassit, Raymond N. J. Veldhuis. Transferability analysis of adversarial attacks on gender classification to face recognition: Fixed and variable attack perturbation |
| 420 | -- | 429 | Zhengquan Luo, Yunlong Wang, Nianfeng Liu, Zilei Wang. Combining 2D texture and 3D geometry features for Reliable iris presentation attack detection using light field focal stack |
| 430 | -- | 444 | Amina Bassit, Florian Hahn 0004, Raymond N. J. Veldhuis, Andreas Peter. Hybrid biometric template protection: Resolving the agony of choice between bloom filters and homomorphic encryption |
| 445 | -- | 458 | Mohamed Amine Hmani, Dijana Petrovska-Delacrétaz, Bernadette Dorizzi. Locality preserving binary face representations using auto-encoders |
| 459 | -- | 484 | Shoaib Meraj Sami, John McCauley, Sobhan Soleymani, Nasser M. Nasrabadi, Jeremy M. Dawson. Benchmarking human face similarity using identical twins |
| 485 | -- | 497 | Enrique Argones-Rúa, Tim Van hamme, Davy Preuveneers, Wouter Joosen. Discriminative training of spiking neural networks organised in columns for stream-based biometric authentication |
| 498 | -- | 511 | Iurii Medvedev, João Tremoço, Beatriz Mano, Luís Espírito Santo, Nuno Gonçalves. Towards understanding the character of quality sampling in deep learning face recognition |
| 512 | -- | 528 | Naser Damer, Fadi Boutros, Marius Süßmilch, Meiling Fang, Florian Kirchbuchner, Arjan Kuijper. Masked face recognition: Human versus machine |
| 529 | -- | 0 | . The following article for this Special Issue was published in a different Issue |