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Touradj Ebrahimi

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Related publications (306)

Multivariate Spectral Analysis for Identifying the Brain Activations During Olfactory Perception

Touradj Ebrahimi, Jean-Marc Vesin, Ashkan Yazdani, Eleni Kroupi

Olfactory perception is a complex phenomenon associated with other processes such as cognition and emotion. Due to this complexity, there are still open issues and challenges regarding olfactory psychophysiology. One challenge concerns the investigation of ...

Ieee2012

DEAP: a database for emotion analysis using physiological signals

Touradj Ebrahimi, Thierry Pun, Anton Nijholt, Ashkan Yazdani, Jong Seok Lee

We present a multimodal dataset for the analysis of human affective states. The electroencephalogram (EEG) and peripheral physiological signals of 32 participants were recorded as each watched 40 one-minute long excerpts of music videos. Participants rated ...

2012

Spam Fighting in Social Tagging Systems

Touradj Ebrahimi, Ivan Ivanov, Sasan Yazdani

Tagging in online social networks is very popular these days, as it facilitates search and retrieval of diverse resources available online. However, noisy and spam annotations often make it difficult to perform an efficient search. Users may make mistakes ...

Springer-Verlag2012

Perceptual Video Compression: A Survey

Touradj Ebrahimi, Jong Seok Lee

With the advances in understanding perceptual properties of the human visual system and constructing their computational models, efforts toward incorporating human perceptual mechanisms in video compression to achieve maximal perceptual quality have receiv ...

Ieee-Inst Electrical Electronics Engineers Inc2012

Affect Recognition Based on Physiological Changes During the Watching of Music Video

Touradj Ebrahimi, Jean-Marc Vesin, Ashkan Yazdani, Jong Seok Lee

Assessing emotional states of users evoked during their multimedia consumption has received a great deal of attention with recent advances in multimedia content distribution technologies and increasing interest in personalized content delivery. Physiologic ...

2012

Quality Assessment of Asymmetric Stereo Pair Formed From Decoded and Synthesized Views

Touradj Ebrahimi, Philippe Hanhart, Francesca De Simone

When a stereo pair is formed from a decoded view and a synthesized view, it is unclear how the overall quality of the stereo pair should be assessed through objective quality metrics. In this paper, this problem is addressed considering a 3D video represen ...

2012

Crowdsourcing Approach for Evaluation of Privacy Filters in Video Surveillance

Touradj Ebrahimi

Extensive adoption of video surveillance, affecting many aspects of the daily life, alarms the concerned public about the increasing invasion into personal privacy. To address these concerns, many tools have been proposed for protection of personal privacy ...

2012

Robust Duplicate Detection of 2D and 3D Objects

Touradj Ebrahimi, Ivan Ivanov, Péter Vajda, Jong Seok Lee, Lutz Goldmann

In this paper, the authors analyze their graph-based approach for 2D and 3D object duplicate detection in still images. A graph model is used to represent the 3D spatial information of the object based on the features extracted from training images to avoi ...

IGI Global2012

Subjective Study of Privacy Filters in Video Surveillance

Touradj Ebrahimi, Francesca De Simone

Extensive adoption of video surveillance, affecting many aspects of the daily life, alarms the concerned public about the increasing invasion into personal privacy. Therefore, to address privacy issues, many tools have been proposed for protection of perso ...

Ieee2012

Introduction to the Special Issue on New Subjective and Objective Methodologies for Audio and Visual Signal Processing

Touradj Ebrahimi

Ieee-Inst Electrical Electronics Engineers Inc2012

Quality assessment of multidimensional video scalability

Touradj Ebrahimi, Francesca De Simone, Jong Seok Lee

Scalability is a powerful concept for adaptive video content delivery to many end users having heterogeneous and dynamic characteristics of networks and devices. In order to maximize users' quality of experience by selecting appropriate combinations of mul ...

Institute of Electrical and Electronics Engineers2012

Subjective quality evaluation via paired comparison: application to scalable video coding

Touradj Ebrahimi, Francesca De Simone, Jong Seok Lee

Scalable video coding is a powerful solution for content delivery in many interactive multimedia services due to its adaptability to varying terminal and network constraints. In order to successfully exploit such adaptability, it is necessary to understand ...

2011

EEG correlates of different emotional states elicited during watching music videos

Touradj Ebrahimi, Ashkan Yazdani, Eleni Kroupi

Studying emotions has become increasingly popular in various research fields. Researchers across the globe have studied various tools to implicitly assess emotions and affective states of people. Human computer interface systems specifically can benefit fr ...

Lecture Notes in Computer Science, Springer2011

Subjective quality evaluation of foveated video coding using audio-visual focus of attention

Touradj Ebrahimi, Francesca De Simone, Jong Seok Lee

This paper presents a foveated coding method using audio-visual focus of attention and its evaluation through extensive subjective experiments on both standard definition and high definition sequences. Regarding a sound-emitting region as the location draw ...

2011

OCULAR ARTIFACT REMOVAL FROM EEG: A COMPARISON OF SUBSPACE PROJECTION AND ADAPTIVE FILTERING METHODS

Touradj Ebrahimi, Jean-Marc Vesin, Ashkan Yazdani, Eleni Kroupi

One of the fundamental challenges in EEG signal processing is the selection of a proper method to correct ocular artifacts in the recorded electroencephalogram (EEG). Several methods have been proposed for this task. Among these methods, two main categorie ...

2011

Efficient Video Coding based on Audio-Visual Focus of Attention

Touradj Ebrahimi, Francesca De Simone, Jong Seok Lee

This paper proposes an efficient video coding method using audio-visual focus of attention, which is based on the observation that sound-emitting regions in an audio-visual sequence draw viewers' attention. First, an audio-visual source localization algori ...

Elsevier2011

Towards High Efficiency Video Coding: Subjective Evaluation of Potential Coding Technologies

Touradj Ebrahimi, Francesca De Simone, Jong Seok Lee, Lutz Goldmann

This paper describes the details and the results of the subjective quality evaluation performed at EPFL, as a contribution to the effort of the joint collaborative team on video coding (JCT-VC) for the definition of the high efficiency video coding (HEVC) ...

Elsevier2011

Audio-visual synchronization recovery in multimedia content

Touradj Ebrahimi, Jong Seok Lee

This paper proposes a method recovering audio-visual synchronization of multimedia content. It exploits the correlation between the acoustic and the visual signals in order to estimate the audio-visual drift existing in the content. By shifting the audio s ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2011

Balancing Attended and Global Stimuli in Perceived Video Quality Assessment

Touradj Ebrahimi

The visual attention mechanism plays a key role in the human perception system and it has a significant impact on our assessment of perceived video quality. In spite of receiving less attention from the viewers, unattended stimuli can still contribute to t ...

2011

Affective content analysis of music video clip

Touradj Ebrahimi, Krista Kappeler, Ashkan Yazdani

Nowadays, the amount of multimedia contents is explosively increasing and it is often a challenging problem to find a con- tent that will be appealing or matches users’ current mood or affective state. In order to achieve this goal, an efficient indexing t ...

ACM2011

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