“…By analyzing the peaks that maximize the response it is possible to estimate the natural frequencies and the damping ratios [ 12 , 13 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. Special interest presents those studies that employ image decomposition approaches [ 17 , 18 , 22 , 25 , 32 , 33 ] to reduce the full-field information to just a few shape descriptors [ 34 , 35 , 36 , 37 ]. In these works, it was demonstrated that HS 3D-DIC is valid for different materials, such as steel, aluminum, composites, and polymers.…”