VISIGRAPP 2019: proceedings of the 14th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications : Prague, Czech Republic, February 25-27, 2019 / Volume 4 VISAPP / edited by Alain Tremeau, Giovanni Farinella and Jose Braz [1] - Tremeau, Alain; Farinella, Giovanni; Braz, Jose (VISIGRAPP 2019 proceedings of the 14th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications : Prague, Czech Republic, February 25-27, 2019, 2019)