1Groupe d’Electromagnétisme Appliqué (GEA), PST Ville d’Avray, Université Paris X-Nanterre, 1 chemin Desvallières, 92410 Ville d’Avray, France 2Laboratoire des images et des signaux (LIS) GIPSA, École Nationale Supérieure d’Ingénieurs Électriciens de Grenoble, Institut National Polytechnique de Grenoble (INPG), Domaine Universitaire, BP 46, 38402 Saint-Martin-d’Hères Cedex, France 3Groupe d’Etu...

* DIRO, U. de Montréal, CP 6128, succ Centre-Ville, Montréal, Canada H3C 3J7 [email protected], **France Télécom R&D/MAPS/AMS/VIP, 38-40 rue du Général-Leclerc, 92794 Issy Les MoulineauxFrance ; [email protected], ***LIRMM, CNRS et Univ. Montpellier 2, 161 rue Ada, 34392 MontpellierFrance [email protected] **** Dépt. d’informatique, UQÀM, CP 8888, succ. Centre-Ville, Montréal...

In this paper, we consider the analysis of polynomial FM signals corrupted by additive heavy-tailed noise. Standard timefrequency techniques fail to analyze such signals. For that, we propose here a new technique, named the robust polynomial WignerVille distribution (r-PWVD) to handle this case. We show that this representation outperforms the robust Wigner-Ville distribution (rWVD) and the rob...

Time-frequency analysis has been found to be effective in monitoring the transient or timevarying characteristics of machinery vibration signals, and therefore its use in machine condition monitoring is increasing. This paper proposes the application of time-frequency methods, which can provide more information about a signal in time and in frequency and gives a better representation of the sig...

In this paper a system for handwritten text localization in document images is proposed. Our system performs skew angle correction using Wigner-Ville distribution and localizes the handwritten areas of the document based on several measures concerning regularity in shape (selfcorrelation, horizontal and vertical symmetry) and in dimensions (aspect ratio, distribution of heights and widths). The...

Heart sounds and murmurs are timevarying signals that would best be analyzed using timefrequency analysis. Windowed Wigner-Ville distribution (WWVD) and smooth windowed Wigner-Vffle distribution (SWWVD) are used to obtain the timefrequency representation of the signal. Determination of parameter setting of WWVD and SWWVD will eliminate the cross-terms and improve time frequency representation. ...

Assessment of muscle fatigue involves the creation of indices based on the estimation of variables such as the instantaneous frequency (IF) and the instantaneous amplitude (IA), which can be estimated from a time-frequency (TF) distribution of a surface electromyographic signal (SEMG). Since during muscle fatigue there is a decrease of the IF and an increase of the IA, slopes from these paramet...

In this paper we present two methodologies to generate heart rate variability (HRV) signals characterized by controlled and real-like time-frequency (TF) structure to be used to assess different methods of non-stationary HRV analysis. The synthesized signals are stochastic processes whose TF structure is predetermined by choosing either the time-course of the instantaneous frequencies and power...

Target identification using Inverse Synthetic Aperture Radar (ISAR) imaging is an important tool required with the current day high-resolution radars for threat assessment and evaluation. Identification of target using the ISAR images is gaining popularity because of its importance in decision-making. The ISAR image represents the target’s reflectivity measured at discrete frequencies in the RF...

This research paper presents some methods to assess the performance of Wigner Ville Distribution for Time-Frequency representation of non-stationary signals, in comparison with the other representations like STFT, Spectrogram etc. The simultaneous timefrequency resolution of WVD is one of the important properties which makes it preferable for analysis and detection of linear FM and transient si...