Publications by Touradj Ebrahimi

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Recent advances in Virtual Reality (VR) technologies have resulted in a wider availability of Head Mounted Displays (HMDs). However, it is still unclear if VR gaming offers a substantial added value to players. For this reason a comparison of gaming experi ...

When a stereo pair is formed from two synthesized views, it is unclear whether objective 2D quality metrics can provide a good estimation of the perceived quality. In this paper, this problem is addressed considering a 3D video represented in multiview vid ...

In this study, we explore the use of virtual reality to subjectively evaluate the visual quality of point cloud contents. To this aim, we develop the PointXR toolbox, a set of Unity applications that can host experiments under variants of interactive and p ...

This paper describes the results of a series of subjective experiments that investigated the annoyance caused by the most common artifacts present in segmented video sequences. Various types of artifacts were inserted into a reference segmented video considered as ideal and shown to our test subjects. The artifacts varied in their location, size, appearance and duration. Annoyance of segmentation artifacts are found to be tied up with their intrinsic characteristics (e.g., size, position) but only weakly re

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 ...

Distributed Video Coding (DVC) is based on a new paradigm in coding, which has received many interests recently. Among other features, DVC is said to provide better error resiliency. This paper proposes a hybrid spatial and temporal error concealment schem ...

Light field technology has recently been gaining traction in the research community. Several acquisition technologies have been demonstrated to properly capture light field information, and portable devices have been commercialized to the general public. H ...

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 ...

The JPEG 2000 is a new image coding standard that specifies only the decoding algorithm and the compressed data format—the encoder algorithm is deliberately left up to you.

The study presented in this paper aims at quantifying the empirical limits of JPEG optimization, when the compressed stream is standard compliant and only the quantization tables are optimized. Image-dependent quantization tables, which minimize the bitrat ...

Point clouds are one of the most promising technologies for 3D content representation. In this paper, we describe a study on quality assessment of point clouds, degraded by octree-based compression on different levels. The test contents were displayed usin ...

This talk starts by defining what is Quality of Experience. It then provides an overview of state of the art in Quality of Experience in multimedia systems. It will finally conclude by presenting challenges and trends that need to be further addressed. ...

In the past years, deep convolutional neural networks have been pushing the frontier of face recognition (FR) techniques in both verification and identification scenarios. Despite the high accuracy, they are often criticized for lacking explainability. The ...

In this paper, we analyze the inﬂuence of temporal asyn- chrony on the subjective quality of stereoscopic video. Based on our recently created 3D video database, different levels of asynchrony were simulated and a comprehensive subjective test was conducte ...

Touradj Ebrahimi

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Towards the Need Satisfaction in Gaming: A comparison of different gaming platforms

Quality Assessment of a Stereo Pair Formed From Two Synthesized Views Using Objective Metrics

PointXR: A Toolbox for Visualization and Subjective Evaluation of Point Clouds in Virtual Reality

Annoyance of Spatio-Temporal Artifacts in Segmentation Quality Assessment

Subjective and Objective Testing in Support of the JPEG Pleno Point Cloud Compression Activity

Towards Fully Automatic Image Segmentation Evaluation

Hybrid Spatial and Temporal Error Concealment for Distributed Video Coding

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Light field compression using translation-assisted view estimation

Audio-visual synchronization recovery in multimedia content

The JPEG 2000 Image Coding Standard

On the Limits of Perceptually Optimized JPEG

Point Cloud Subjective Evaluation Methodology based on 2D Rendering

Multimodal Person Search Combining Information Fusion and Relevance Feedback

Quality of Multimedia Experience: Past, Present and Future

Towards Visual Saliency Explanations of Face Verification

Factors impacting quality of experience in stereoscopic images

Temporal Synchronization in Stereoscopic Video: Influence on Quality of Experience and Automatic Asynchrony Detection

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

A Comprehensive Database and Subjective Evaluation Methodology for Quality of Experience in Stereoscopic Video