BIOSIG 2021 proceedings of the 20th International Conference of the Biometrics Special Interest Group - Brömme, Arslan; Busch, Christoph; Damer, Naser 1985-; Dantcheva, Antitza; Gomez-Barrero, Marta; Raja, Kiran; Rathgeb, Christian; Sequeira, Ana F.; Uhl, Andreas 1968- (Gesellschaft für Informatik e.V. (GI), 2021)