Fahmi Kammoun

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From years ago, encryption became a necessity to transmit data securely. Like message written, fixed images or movies should be encrypted also while transmitted over a public channel. Currently, the literature is pointed to selective encryption for those types of data against attacks. That's to say, the encryption module is inserted into the chain of video(More)
Currently, research is focused on selective encryption to protect movies against attacks transmitted over a public network. This choice is taken to ensure the security of compressed data without adding an important supplemental computational time for the encryption. So the encryption module is inserted into the video compression chain. In this paper we(More)
Biometric user authentication techniques have evoked an enormous interest by science, industry and society in the recent past. Scientists and developers have constantly pursued the technology for automated determination or confirmation of the identity of subjects based on measurements of physiological or behavioral traits of humans. The ultimate goal of any(More)
As time is important in coding video, this paper presents an optimization method to reduce encoding time of CABAC with respect to the compression rate, delivering the same video quality. This method is based on the statistics of the context models of syntax elements which have a higher number of contexts than others to be compelled in order to reduce their(More)
In this paper we are interested in establishing a pretreatment for existing metrics without reference (MSU Blocking Metric) for the H.264/MPEG-4 (Motion Picture Expert Group) AVC (Advanced Video Coding) standard. We perform a pretreatment using HARRIS saliency map to improve the performance of this metric. We evaluate the performance of the proposed(More)
In This paper, we propose a new perceptually significant video quality metric to estimate the effect of block coding for standards H.264 AVC and MPEG2. Our method operates in the spatial domain and doesn't require a high complexity of computation. We compare it with Suthaharan's and MSU's techniques by using “LIVE” database. Results indicate(More)
The concept of data compression in CODECs is based on pixel prediction to avoid redundancy. For the security of data compressed with the H.264/AVC CODEC, researchers are thinking to selective encryption. This paper presents a chaos based encryption method inserted in the H.264/AVC used for video conferencing application. It consists of the encryption of(More)