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- Sofiane Ramdani, Benoît Seigle, Julien Lagarde, Frédéric Bouchara, Pierre Louis Bernard
- Medical engineering & physics
- 2009

We analyze the irregularity of human postural sway data during quiet standing using the sample entropy (SampEn) algorithm. By considering recent methodological developments, we show that the SampEn parameter is able to characterize the irregularity of the center of pressure fluctuations through the analysis of the velocity variable. We present a practical… (More)

- Thibault Lelore, Frédéric Bouchara
- ICDAR
- 2011

In this paper, we present a novel approach for super-resolved binarization of document images acquired by low quality devices. The algorithm tries to compute the super resolution of the likelihood of text instead of the gray value of pixels. This method is the extension of a binarization algorithm (FAIR: a Fast Algorithm for document Image Restoration)… (More)

- Thibault Lelore, Frédéric Bouchara
- IEEE Transactions on Pattern Analysis and Machine…
- 2013

We present, in this paper, the FAIR algorithm: a fast algorithm for document image restoration. This algorithm has been submitted to different contests where it showed good performance in comparison to the state of the art. In addition, this method is scale invariant and fast enough to be used in real-time applications. The method is based on a… (More)

- Thibault Lelore, Frédéric Bouchara
- ICDAR
- 2009

This paper presents a new approach for the binarization of seriously degraded manuscript. We introduce a new technique based on a Markov Random Field (MRF) model of the document. Depending on the available information, the model parameters (clique potentials) are learned from training data or computed using heuristics. The observation model is estimated… (More)

- Sofiane Ramdani, Frédéric Bouchara, Jean-François Casties
- Physical review. E, Statistical, nonlinear, and…
- 2007

We propose a criterion to detect determinism in short time series. This criterion is based on the estimation of the parameter E2 defined by the averaged false neighbors method for analyzing time series [Cao, Physica D 110, 43 (1997)]. Using surrogate data testing with several chaotic and stochastic simulated time series, we show that the variation… (More)

- Sofiane Ramdani, Frédéric Bouchara, Julien Lagarde
- Chaos
- 2009

We study the effect of static additive noise on the sample entropy (SampEn) algorithm [J. S. Richman and J. R. Moorman, Am. J. Physiol. Heart Circ. Physiol. 278, 2039 (2000); R. B. Govindan et al., Physica A 376, 158 (2007)] for analyzing time series. Using surrogate data tests, we empirically investigate the ability of the SampEn index to detect… (More)

- Sofiane Ramdani, Benoît Seigle, Déborah Varoqui, Frédéric Bouchara, Hubert Blain, Pierre Louis Bernard
- Annals of Biomedical Engineering
- 2010

We investigate human postural sway velocity time series by computing two dynamical statistics quantifying the smoothness (the central tendency measure or CTM) and the regularity (the sample entropy or SampEn) of their underlying dynamics. The purpose of the study is to investigate the effect of aging and vision on the selected measures and to explore the… (More)

- Sofiane Ramdani, Frédéric Bouchara, Khalifa Djemal
- Signal Processing
- 2004

- Frédéric Bouchara
- Applied optics
- 2004

Subpixel-edge detection is the first stage in processing many high-level vision algorithms. However, the study of the statistical properties of such data has remained incomplete in most research. We present a method for estimating the second-order moments of the subpixel-edge position, computed by a deterministic algorithm based on three quadratic… (More)

- Frédéric Bouchara, Marc Bertrand, Sofiane Ramdani, Mahmoud Haydar
- MIRAGE
- 2007