1. Politehnica National University for Science and Technology, Bucharest, Romania
2. Fraunhofer Institute for Digital Media Technology, Ilmenau, Germany
3. Information Technology Institute CERTH, Thessaloniki, Greece
4. Czech Technical University, Prague, Czech Republic
5. Université Paris-Saclay, CEA, List, F-91120, Palaiseau, France
6. CNIT and Mercatorum University, Rome, Italy