Publications by Touradj Ebrahimi

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

Currently, the large majority of 3D display solutions rely on binocular perception phenomena. Furthermore, while 3D display technologies are already widely available for cinema and home or corporate use, only a few portable devices currently feature 3D dis ...

Omnidirectional visual content is a form of representing graphical and cinematic media content which provides subjects with the ability to freely change the direction of view. Along with virtual reality, omnidirectional imaging is becoming a very important ...

This paper presents a new approach for the design of a full reference objective quality metric for the assessment of color pictures. Our goal is to build a multi-channel metric based on the perceptual weighting of single-channel metrics. A psycho-visual experiment is thus designed in order to determine the values of the weighting factors. This metric is expected to provide a new useful tool for the quality assessment of compressed pictures in the framework of codec performance evaluation.

The authors describe a compact VLSI implementation of fast pipelined two-dimensional FIR filters. A polyphase architecture is presented. The filter bank makes special use of coefficients which are in powers-of-two. This leads to an interest scheme where only shift and add operations are compared. A novel design strategy has been used to speed up the algorithm, as well as a novel adder. Internally, the speed achieved is around 200 MHz

In this paper, two new end-to-end image compression architectures based on convolutional neural networks are presented. The proposed networks employ 2D wavelet decomposition as a preprocessing step before training and extract features for compression from wavelet coefficients. Training is performed end-to-end and multiple models operating at di↵erent rate points are generated by using a regularizer in the loss function. Results show that the proposed methods outperform JPEG compression, reduce blocking and

In recent years, the remarkable progress in facial manipulation techniques has raised social concerns due to their potential malicious usage and has received considerable attention from both industry and academia. While current deep learning-based face for ...

Evaluating the performance of different 3D codecs on multiview autostereoscopic monitor is a tedious process, as it requires the synthesis of a dense set of views. Therefore, it is legitimate to ask if evaluations could be performed on stereoscopic monitor ...

The advancement of face recognition technology has delivered substantial societal advantages. However, it has also raised global privacy concerns due to the ubiquitous collection and potential misuse of individuals' facial data. This presents a notable par ...

This paper proposes an efficient video coding method based on audio-visual attention, which is motivated by the fact that cross-modal interaction significantly affects humans’ perception of multimedia experiences. First, we propose an audio-visual source l ...

This paper describes EPFL privacy protection tool for the MediaEval 2014 Visual Privacy task. The goal of the task is to obscure faces, body silhouettes, and personal items of people in the provided surveillance clips to preserve their personal privacy. Th ...

The success of 3D video, as one of the emerging multimedia formats, will largely depend on the improved quality of experience that it provides to viewers when compared to conventional 2D video. Therefore reliable methods for 3D video quality assessment are ...

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 ...

The Bjøntegaard model is widely used to calculate the coding efficiency between different codecs. However, this model might not be an accurate predictor of the true coding efficiency as it relies on PSNR measurements. Therefore, in this paper, we propose a ...

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 ...

Consistent and imitable subjective measurement 3D video quality assessment is investigated for evaluating 3D service parameters and as an essential criterion towards the development of objective models. This paper analyzes the results obtained from three t ...

Distributed Video Coding (DVC) is a new video coding paradigm based on two major Information Theory results: the Splepian-Wolf and Wyner-Ziv theorems. Recently, practical DVC solutions have been proposed with promising results; however, there is still a ne ...

The color gamut supported by current commercial displays is only a subset of the full spectrum of colors visible by the human eye. In High-Definition (HD) television technology, the scope of the supported colors covers 35.9% of the full visible gamut. For ...

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) ...

Sensation of reality refers to the ability of users to feel present in a multimedia experience. As 3D technologies target to provide more immersive and higher quality multimedia experiences, it is important to understand Quality of Experience (QoE) and sen ...

Touradj Ebrahimi

Chat with Graph Search

Comparison of 3D portable display restitution techniques based on stereo and motion parallax

Testbed for subjective evaluation of omnidirectional visual content

A multi-channel objective model for the Full-Reference assessment of color pictures

A VLSI filter architecture for digital HDTV codecs

A new end-to-end image compression system based on convolutional neural networks

MMHealth 2017 Workshop on Multimedia for Personal Health and Health Care

Improving Deepfake Detectors against Real-world Perturbations with Amplitude-Phase Switch Augmentation

On the evaluation of 3D codecs on multiview autostereoscopic display

PRO-Face C: Privacy-Preserving Recognition of Obfuscated Face via Feature Compensation

Video coding based on audio-visual attention

MediaEval 2014 Visual Privacy Task: Geometrical Privacy Protection Tool

Towards reliable and reproducible 3D video quality assessment

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

Calculation of average coding efficiency based on subjective quality scores

Efficient Video Coding based on Audio-Visual Focus of Attention

Cross-lab Subjective Evaluation of the MVC+D and 3D-AVC 3D Video Coding Standards

Distributed Video Coding: Selecting the most promising application scenarios

Evaluation of Color Mapping Algorithms in Different Color Spaces

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

Predicting Subjective Sensation of Reality During Multimedia Consumption Based on EEG and Peripheral Physiological Signals