Computer Vision, Imaging and Computer Graphics Theory and Applications : 16th International Joint Conference, VISIGRAPP 2021, Virtual Event, February 8-10, 2021, Revised Selected Papers - de Sousa, A. Augusto; Bouatouch, Kadi; Farinella, Giovanni Maria; Havran, Vlastimil; Hurter, Christophe; Paljic, Alexis; Peck, Tabitha; Purchase, Helen; Radeva, Petia (Cham Springer International Publishing AG, 2023)