Antonia Moropoulou Andreas Georgopoulos Anastasios Doulamis Marinos Ioannides Alfredo Ronchi (Eds.) Second International Conference, TMM_CH 2021 Athens, Greece, December 13–15, 2021 Revised Selected Papers Trandisciplinary Multispectral Modelling and Cooperation for the Preservation of Cultural Heritage Communications in Computer and Information Science 1574