Deformation detection with frequency modulation

We describe a robust and knowledge-free method to perform the deformation extraction from textured images. We first recall how the Solid Mechanics approach of deformation leads to a nonseparability of the couple ''deformation/motion'' in the case of elastic material, but sets a distinction in the plastic case. We then present a frequency-modulation/demodulation based method to recognize the deformation within textured images. Choices, algorithm limits and suitable data are discussed. Eventually, results are presented in the static case, that is on a single image, and then in tracking deformed areas within image sequences. Copyright (C) 1996 Pattern Recognition Society. Published by Elsevier Science Ltd.