Publications by Touradj Ebrahimi

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Due to the recent advances in ultra high definition (UHD) displays, UHD TV may replace HD TV in a near future. However, little is known about the effect of UHD content on human visual perception, specifically, on human visual attention, viewing strategies, ...

The widespread use of digital video surveillance systems has also increased the concerns for violation of privacy rights. Since video surveillance systems are invasive, it is a challenge to find an acceptable balance between privacy of the public under sur ...

This paper introduces a methodology for evaluating quality of experience in mixed immersive communication systems. It focuses on assessing the impact of advanced 3D capture techniques, immersive eye-sensing light field displays, and efficient compression mechanisms in mixed setups where terminals offer different imaging modalities. The paper methodically investigates the influence of the above technologies on user experience in various communication scenarios. By employing a quantitative assessment, the pri

Recently, there has been an increased interest in capture, processing and rendering of visual content in form of point clouds. Among other challenges, subjective and objective quality evaluation of point clouds are still open problems. Most proposed subjec ...

Sharing photos online is a common activity on social networks and photo hosting platforms, such as Facebook, Pinterest, Instagram, or Flickr. However, after reports of citizens surveillance by governmental agencies and the scandalous leakage of celebrities ...

Although HDR content processing, coding and quality assessment have been largely addressed in the last few years, little to no work has been concentrating on how to assess quality in HDR for 360 or omnidirectional content. This paper is an attempt to answer to various questions in this direction. As a minimum, a new data set for 360 HDR content is proposed and a new methodology is designed to assess subjective quality of HDR 360 content when it is displayed on SDR HMD after applying various tone mapping ope

Local illumination changes due to shadows often reduce the quality of object-based video composition and mislead object recognition. This problem makes shadow detection a desirable tool for a wide range of applications, such as video production and visual ...

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 ...

3D image and video have become popular since they can enhance the Quality of Experience (QoE) by adding the depth dimension to the traditional 2D media. In order to design and optimize the human-centric 3D multimedia processing techniques, it is important ...

This paper presents a novel multimodal dataset for the analysis of Quality of Experience (QoE) in emerging immersive multimedia technologies. In particular, the perceived Sense of Presence (SoP) induced by one-minute long video stimuli is explored with res ...

JPEG scrambling tool is a flexible web-based tool with an intuitive and simple to use GUI and interface to secure visual information in a region of interest (ROI) of JPEG images. The tool demonstrates an efficient integration and use of security tools in J ...

Brain-computer interface (BCI) systems allow the user to interact with a computer by merely thinking. Successful BCI operation depends on the continuous adaptation of the system to the user and on the user motivation. This paper presents a model of continuous adaptation using kernel based dynamic data characterization. Additionally, the adaptive capabilities of the brain are engaged by providing feedback to the user who can modulate her mental activity so as to make the BCI accomplish her intents.

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 ...

In this paper, we share our results for privacy protection using false coloring in surveillance systems in the Drone Protect Task. The aim is obscuring sensitive regions that are privacy related without sacrificing intelligibility and pleasantness. The ide ...

In this paper, we describe EPFL privacy protection tool submitted to the MediaEval 2013 Visual Privacy task. The goal of the task is to obscure faces and other personal items of people in the provided surveillance clips to preserve their personal privacy. ...

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 ...

Since privacy issues are becoming important with growth of the video surveillance, many tools are proposed for protection of personal privacy in the video. However, little is understood regarding the effectiveness of such tools and their effect on the unde ...

In this paper, we consider the challenging problem of unusual event detection in video surveillance systems. The proposed approach makes a step toward generic and automatic detection of unusual events in terms of velocity and acceleration. At first, the mo ...

Ultra High Definition (UHD) is one of the emerging immersive video technologies already available to public, as even some of the smartphones are capable of capturing UHD video. The increasingly widespread availability of UHD capable recording devices has i ...

Touradj Ebrahimi

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Ultra-Eye: UHD and HD images eye tracking dataset

Special Section Guest Editorial: Image and Video Compression Using Deep Neural Networks

Using Warping for Privacy Protection in Video Surveillance

On evaluating quality of experience in mixed immersive communication scenarios

Towards subjective quality assessment of point cloud imaging in augmented reality

Privacy-Preserving Photo Sharing based on a Secure JPEG

Measuring quality of omnidirectional high dynamic range content

Shadow-aware object-based video processing

Perceptual Video Compression: A Survey

User-independent classification of 2D versus 3D multimedia experiences through EEG and physiological signals

Multimodal Dataset for Assessment of Quality of Experience in Immersive Multimedia

Scrambling-based tool for secure protection of JPEG images

Human-Computer adaptation for EEG based communication

Affective content analysis of music video clip

MediaEval 2015 Drone Protect Task: Privacy Protection in Surveillance Systems Using False Coloring

MediaEval 2013 Visual Privacy Task: Warping-based Privacy Protection Tool

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

Evaluation of Visual privacy Filters Impact on Video Surveillance Intelligibility

Towards Generic Detection of Unusual Events in Video Surveillance

UHD Video Dataset for Evaluation of Privacy