Samia Belkacem

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A substantial amount of work has been devoted to understanding the human visual system (HVS) and applying this knowledge to image processing applications. In this paper, we present a novel watermarking approach for applications in copy protection and digital archives based on perceptual masking. In the proposed scheme, local properties of the image and the(More)
This paper presents a new method for color image watermarking based on chaos theory. For reasons of simplicity, the watermark is embedded in the spatial domain into the blue channel of RGB color space in order to increase invisibility of the watermarks. Watermark detection is performed without using the original image, by computing the statistical(More)
The cross-correlation coefficient (CC) was used to estimate the effects of muscular voluntary contraction (MVC) and fibres inclination. The study was based on simulated surface electromyographic (sEMG) signals generated in a cylindrical multi-layer volume conductor (bone, muscle, fat and skin) and detected by longitudinal single differential (LSD), inverse(More)
OBJECTIVE Watershed infarcts (WSI) are thought to result from hemodynamic mechanism, but studies have suggested that microemboli from unstable carotid plaques may distribute preferentially in watershed areas, i.e., between two cerebral arterial territories. Intraplaque haemorrhage (IPH) is an emerging marker of plaque instability and microembolic activity.(More)
A robust watermark should be able to withstand most image manipulation such as cropping, additive noise and JPEG compression. It is a well known fact that the watermarking of DC components of discrete Cosine transform (DCT) stand against JPEG compression. We build on this concept by inserting a watermark in the transform domain to further enhance the(More)
The aim of this study was to understand the effects of lime and gypsum on nitrogen and carbon turnover of the soil. A pot experiment was conducted in parallel with a field experiment which was set up in 1989 in a declining forest of the French Ardennes. A dystric cambisol, associated with a moder and mull humus separately, was used to study changes in the(More)
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