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Illegal copying of multimedia files has become a very common practice. Indeed, with the rapid development of means of communication, sharing, copying and illegal downloading have become a very easy handling action, at everybody's reach. The magnitude of this continuously increasing phenomenon may have a significant economic impact since it induces a marked loss on turnover. To cope with this huge...
Digital watermarks have been proposed in recent literature as a means for copyright protection of multimedia data. In this paper, we investigate the use of intelligent wavelet networks to the image watermarking problem. The host image is transformed to the Discrete Wavelet Transform and a wavelet network is utilized to approach coefficients values and memorize it between the original and watermarked...
Providing ultra high-speed end-to-end connectivity in core optical networks while satisfying the requirements for quality of service is a topic of intense research. In an optical network, a connection is set up to carry a data signal via an all-optical channel (lightpath) from its source to destination nodes. The analog nature of the signal transmission through the network links and nodes leads to...
In this paper, we investigate PLI-aware RWA with regenerator placement in translucent WDM networks. A novel approach achieving a performance very close to that of an optical network with full regeneration capability is proposed.
Transmission quality is being a very important issue in optical communication systems. As an optical signal propagates along a lightpath connecting a source node to a destination node in the network, the quality of transmission is degraded due to transmission impairments introduced by long-haul optical components. Consequently, the signal's bit error rate (BER) at the destination node can become unacceptably...
The watermarking is a technique that gives protection to multimedia data such as images and video. Actually, their protection from malicious manipulations as unauthorized copying and illegal distribution becomes a necessity. A simple re-used of still images watermarking techniques for video watermarking are not sufficiently efficient. In fact, if the mark is embedded in every frame of the video without...
Point-to-point or point-to-multipoint optical access systems are now considered as a viable alternative to xDSL technologies for broadband services. Point-to-multipoint WDM-PONs are the most advanced solution in this matter. Multiple architectures have been proposed since a few years for Next Generation WDM PON (NG-WDM-PON) operating on an hybrid TDMA (Time Division Multiple Access) and WDMA (Wavelength...
With the rapid development of multimedia applications, and the fact that a large quantity of multimedia data is distributed via the Internet network, the protection of video becomes a major problem. It is therefore necessary to protect them. This can be done using video watermarking methods. To be really efficient, the mark has to be resistant to malicious attacks. Methods developed for still images...
Over the last decade, numerous routing and wavelength assignment (RWA) algorithms have been developed for WDM optical networks planning. Most of these algorithms neglect the feasibility of the obtained lightpaths. In this paper, we propose a new algorithm, called LERP (Lightpath Establishment with Regenerator Placement), that enables to solve the problem of RWA in guaranteeing the feasibility of the...
In the absence of all-optical 3R regenerators, the quality of transmission has a strong impact of the feasibility of all-optical long-haul transmission. Four main physical layer impairments degrade the quality of an optical analog signal, namely chromatic dispersion (CD), polarization mode dispersion (PMD), optical signal to noise ratio (OSNR), and nonlinear phase shift (PhiNL). In most previous studies,...
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