1 Centro de Computação Gráfica, Campus of Azurém, 4800-058 Guimarães, Portugal. Electronic address: joana.vieira@ccg.pt.
2 University of Minho, Centro Algoritmi, Campus of Azurém, 4800-058 Guimarães, Portugal.
3 Centro de Computação Gráfica, Campus of Azurém, 4800-058 Guimarães, Portugal.
4 BOSCH Car Multimedia, Rua Max Grundig, 35, Lomar, 4705-820 Braga, Portugal.
5 University of Minho, Department of Mechanical Engineering, Campus of Azurém, 4800-058 Guimarães, Portugal.
6 Centro de Computação Gráfica, Campus of Azurém, 4800-058 Guimarães, Portugal; University of Minho, Centro Algoritmi, Campus of Azurém, 4800-058 Guimarães, Portugal; University of Minho, Department of Basic Psychology, Campus of Gualtar, 4710-057 Braga, Portugal.