Perception of Non-Rigid Motion: Inference of Shape, Material, and Force.

摘要

Most non-rigid motion is much simpler than is generally thought, having many fewer degrees of freedom than, for instance, 3-D shape. The relatively circumscribed nature of non-rigid motion can be seen by examining it from the perspective of vibration modes. The fact that a small number of parameters are sufficient to describe non-rigid motion mean that it is plausible to use sensory data to recover a nearly complete physical model of an object so that we can, for instance, predict its response to impinging forces. One perceptual task of considerable interest is estimating material properties such as stiffness, strength, and mass by watching, touching or listening to collisions. We derive equations which allow estimates of these material properties to be extracted form visual and tactile data, and speculate on the aural data. (AN).