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Touradj Ebrahimi

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Related publications (306)

On Evaluating Video Object Segmentation Quality: A Perceptually Driven Objective Metric

The task of extracting objects in video sequences emerges in many applications such as object-based video coding (e.g., MPEG-4) and content-based video indexing and retrieval (e.g., MPEG-7). The MPEG-4 standard provides specifications for the coding of vid ...

2009

SS-SSIM and MS-SSIM for digital cinema applications

Touradj Ebrahimi

One of the key issues for a successful roll out of digital cinema is in the quality it offers. The most practical and least expensive way of measuring quality of multimedia content is through the use of objective metrics. In addition to the widely used obj ...

SPIE2009

Error-resilient Scalable Compression based on Distributed Video Coding

Touradj Ebrahimi, Mourad Ouaret, Frédéric Dufaux

Distributed Video Coding (DVC) is a new paradigm for video compression based on the information theoretical results of Slepian-Wolf (SW) and Wyner-Ziv (WZ). In this work, a performance analysis of image and video coding schemes based on DVC are presented, ...

2009

Multi-view video segmentation and tracking for video surveillance

Touradj Ebrahimi, Frédéric Dufaux, Thien Ha Minh, Gelareh Mohammadi

Tracking moving objects is a critical step for smart video surveillance systems. Despite the complexity increase, multiple camera systems exhibit the undoubted advantages of covering wide areas and handling the occurrence of occlusions by exploiting the di ...

2009

Graph-Based Approach for 3D Object Duplicate Detection

Touradj Ebrahimi, Frédéric Dufaux, Péter Vajda

In this paper, we consider the challenging problem of object duplicate detection and localization. Several applications require efficient object duplicate detection methods, such as automatic video and image tagging, video surveillance, and high level imag ...

2009

Subjective assessment of H.264/AVC video sequences transmitted over a noisy channel

Touradj Ebrahimi, Frédéric Dufaux, Francesca De Simone

In this paper we describe a database containing subjective assessment scores relative to 78 video streams encoded with H.264/AVC and corrupted by simulating the transmission over error-prone network. The data has been collected from 40 subjects at the prem ...

2009

Analysis of the Limits of Graph-Based Object Duplicate Detection

Touradj Ebrahimi, Péter Vajda, Lutz Goldmann

In this paper, we consider the evaluation of graph-based object duplicate detection. Several applications require accurate and efficient object duplicate detection methods, such as automatic video and image tag propagation, video surveillance, and high lev ...

2009

Iterative Multiview Side Information for Enhanced Reconstruction in Distributed Video Coding

Touradj Ebrahimi, Mourad Ouaret, Frédéric Dufaux

Distributed Video Coding (DVC) is a new paradigm for video compression based on the information theoretical results of Slepian and Wolf (SW) and Wyner and Ziv (WZ). DVC entails low complexity encoders as well as separate encoding of correlated video source ...

2009

Improved Side Information Generation for Distributed Video Coding by Exploiting Spatial and Temporal Correlations

Touradj Ebrahimi, Mourad Ouaret, Frédéric Dufaux

Distributed Video Coding (DVC) is a new paradigm in video coding, which is receiving a lot of interests nowadays. Side Information (SI) generation is a key function in the DVC decoder, and plays a key-role in determining the performance of the codec. This ...

2009

Efficient video coding in H.264/AVC by using audio-visual information

Touradj Ebrahimi, Jong Seok Lee

This paper proposes an efficient video coding method which utilizes audio-visual information, based on the observation that sound-emitting regions in a video sequence attract observer’s attention. The regions responsible for the sound are identified by an ...

2009

Implicit emotional tagging of multimedia using EEG signals and brain computer interface

Touradj Ebrahimi, Ashkan Yazdani, Jong Seok Lee

In multimedia content sharing social networks, tags assigned to content play an important role in search and retrieval. In other words, by annotating multimedia content, users can associate a word or a phrase (tag) with that resource such that it can be se ...

ACM2009

Analysis of SSIM performance for Digital Cinema applications

Touradj Ebrahimi

Visual quality is one of the most important issues in digital cinema applications, and the most practical method to measure visual quality is using objective metrics. Several objective metrics that take into account perceived visual quality have been devel ...

2009

Curiosity Cloning: Neural Analysis of Scientific Knowledge

Touradj Ebrahimi, Ashkan Yazdani, Leopoldo Rossini

Event-related potentials (ERPs) are indicators of brain activity related to cognitive processes. They can be detected from EEG signals and thus constitute an attractive non-invasive option to study cognitive information processing. The P300 wave is probabl ...

2009

Two-level bimodal association for audio-visual speech recognition

Touradj Ebrahimi, Jong Seok Lee

This paper proposes a new method for bimodal information fusion in audio-visual speech recognition, where cross-modal association is considered in two levels. First, the acoustic and the visual data streams are combined at the feature level by using the ca ...

Springer-Verlag2009

A comparative study of color image compression standards using perceptually driven quality metrics

Touradj Ebrahimi, Frédéric Dufaux, Michael Ansorge, Francesca De Simone

The task of comparing the performance of different codecs is strictly related to the research in the field of objective quality metrics. Even if several objective quality metrics have been proposed in literature, the lack of standardization in the field of ...

SPIE2008

H.264/AVC Video Scrambling for Privacy Protection

Touradj Ebrahimi, Frédéric Dufaux

In this paper, we address the problem of privacy in video surveillance systems. More specifically, we consider the case of H.264/AVC which is the state-of-the-art in video coding. We assume that Regions of Interest (ROI), containing privacy-sensitive infor ...

2008

An efficient P300-based brain-computer interface for disabled subjects

Touradj Ebrahimi, Jean-Marc Vesin, Ulrich Hoffmann

A brain-computer interface (BCI) is a communication system that translates brain-activity into commands for a computer or other devices. In other words, a BCI allows users to act on their environment by using only brain-activity, without using peripheral n ...

2008

Bayesian Feature Selection Applied In a P300 Brain- Computer Interface

Touradj Ebrahimi, Jean-Marc Vesin, Ulrich Hoffmann, Ashkan Yazdani

Feature selection is a machine learning technique that has many interesting applications in the area of brain- computer interfaces (BCIs). Here we show how automatic relevance determination (ARD), which is a Bayesian feature selection technique, can be app ...

2008

Enabling Privacy For Distributed Video Coding by Transform Domain Scrambling

Touradj Ebrahimi, Mourad Ouaret, Frédéric Dufaux

In this paper, a novel scheme for video scrambling is introduced for Distributed Video Coding. The goal is to conceal video information in several applications such as video surveillance and anonymous video communications to preserve privacy. This is achie ...

2008

Towards Fully Automatic Image Segmentation Evaluation

Touradj Ebrahimi, Péter Vajda, Lutz Goldmann

Spatial region (image) segmentation is a fundamental step for many computer vision applications. Although many methods have been proposed, less work has been done in developing suitable evaluation methodologies for comparing different approaches. The main ...

Springer2008

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