Time-frequency image enhancement based on interference suppression in Wigner-Ville distribution

This paper proposes a time-frequency (t-f)image enhancement method for suppressing interference terms in the Wigner-Ville distribution. The proposed technique adapts the direction of the smoothing kernel locally at each t-f point, so that the smoothing kernel remains aligned with the ridges of the auto-terms. This local alignment of the smoothing kernel reduces cross-terms without degrading the energy concentration of auto-terms. The results indicate that the proposed time-frequency distribution outperforms other methods in terms of its ability to resolve close signal components. (C) 2016 Elsevier B.V. All rights reserved.