Displacement, Strain and Relative Optical Flow

This paper describes theory of estimation method of displacement and strain distribution on a 2-D object using relative optical flow. Two sequential images of the object are mapped on to a normalized rectangular region using time yawing function coordinate systems. Relative optical flow is estimated on the normalized rectangular domain. Displacement and strain distribution on the object are obtained parametrically by transforming from relative optical flow. The proposed method may estimate strain distribution on the object without contact, even if that is moving or changing the shape of itself. Finally, usefulness of the proposed method is demonstrated applying to an example.