Abstract
Surface strain distributions of the skin on a human face are measured in the present study. A stereovision based on 3D digital image correlation is employed for obtaining the displacement distribution on a face during the blink. Surface strains on the face are evaluated from the 3D displacement components by converting the displacements into the in-plane displacements on a local coordinate system. The complicated surface strain distribution as well as the principal strain direction is observed. It is considered that the complicated strain distribution is related to the motion of the muscle inside the face.
