Fig. 6

General view of the acquisition system used for a the “Paliotto” and b the “Portiera”; the actuators M1 and M3 were used for positioning the lasers, M2 was not used in this set-up; 8 and 9 markers were fixed on the leather, 1 on the fixed frame; the markers F, attached to the fixed frame, were used as reference for computing the total stretching of the leather