H. Laurent

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This paper presents a new method based on time frequency representations (TFRs) for detecting abrupt changes in non-stationary noisy signals, Stationarity indices (SIs), based on different distance measures between TFRs, are defined and a comparison of the performances is performed using ROC curves and statistical properties. Two sets of signals are(More)
This paper deals with a comparative study of metrics allowing the evaluation of results provided by object localization algorithms. We particularly focus on localization by the bounding box representation. 26 metrics are studied in this paper. A protocol is presented for the creation of ground truths and synthetic results of localization algorithms. These(More)
Milne's approach to the numerical solution of the Schrodinger equation via a non-linear differential equation and the quantisation of a quantum action is investigated in detail. An accurate and efficient computational method is presented which allows a rapid second-order convergence onto a desired eigenenergy E,. Numerical sample calculations demonstrate(More)
Atmospheric circulations in the tropics are not well known. Beyond of its complexity, the understanding of tropical meteorology has been prejudiced by the lack of observational data. Meteorological satellites appear as important source of information to complement in-situ observations. At FUNCEME, the Ceara State Foundation for Meteorology and Water(More)
The improvement of forest fire metrology tools constitutes a crucial step towards firefighting means optimization. In this context, the aim of this work is to extract accurately fire regions in images. Chrominance channels of Lab, YUV and YCbCr color spaces are investigated to find a discriminative channel for fire pixels segmentation. Based on an optimized(More)
Dissections and extracellular recordings from 45 descending contralateral movement detector (DCMD) neurons were as described in refs 12 and 20. We used extra-cellular recordings from the DCMD to monitor the spike activity of the LGMD because their spiking outputs match perfectly (Fig. 4a). Intracellular recordings from the LGMD (n ¼ 91 animals) were(More)
Deep convective systems morphological characteristics distribution are analysed for january/february 1999 during WETAMC/LBA experiment. Spatial relationship with land surface elevation and vegetation cover distribution is observed. Occurences and initiations of convective systems show some relations with orography. Radius is more linked with vegetation(More)
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