Document Type


Publication Date

July 2003

Patent Number



The present invention provides a system and method for recovering material properties of non-rigid objects. The method includes, for example, the steps of: establishing a plurality of three-dimensional point correspondences of the non-rigid object in an unstressed and stressed state; from the plurality of point correspondences, generating a finite element model of the non-rigid body having initial material properties and generating a finite element strain distribution; detecting abnormal areas of the non-rigid body by comparing finite element strain levels from the strain distribution; and determining at least one material property of the abnormal areas. The system includes, for example, a general or personal computer with, optionally, one or more digital cameras and range finding devices for acquiring and processing three-dimensional correspondence data associated with the non-rigid object being an unstressed and stressed state. Among the plurality of material properties recoverable by the present invention are material elasticity and geometry. An iterative descent method is utilized to refine the finite element model and recover the missing or estimated material properties.

Application Number



University of South Florida

Filing Date


Primary/U.S. Class