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Touradj Ebrahimi

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Publications associées (306)

Point Cloud Subjective Evaluation Methodology based on 2D Rendering

Touradj Ebrahimi, Evangelos Alexiou

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 ...

2018

A Rendering Solution to Display Light Field in Virtual Reality

Touradj Ebrahimi, Evgeniy Upenik, Irene Viola

There is a need for affordable and easily deployable rendering and display solutions to take full advantage of light field imaging. In particular, the research community needs ways to better assess the impact of various light field imaging technologies bas ...

IEEE2018

A novel methodology for quality assessment of voxelized point clouds

Touradj Ebrahimi, Evangelos Alexiou

Recent trends in multimedia technologies indicate a significant growth of interest for new imaging modalities that aim to provide immersive experiences by increasing the engagement of the user with the content. Among other solutions, point clouds denote an ...

SPIE-INT SOC OPTICAL ENGINEERING2018

A Reliable and Reversible Image Privacy Protection Based on False Colors

Touradj Ebrahimi

2018

ICtCp Versus Y'CbCr

Touradj Ebrahimi, Martin Rerabek, Anne-Flore Nicole Marie Perrin

2018

Point cloud subjective evaluation methodology based on reconstructed surfaces

Touradj Ebrahimi, Evangelos Alexiou

Point clouds have been gaining importance as a solution to the problem of efficient representation of 3D geometric and visual information. They are commonly represented by large amounts of data, and compression schemes are important for their manipulation ...

SPIE-INT SOC OPTICAL ENGINEERING2018

Comparison of Interactive Subjective Methodologies for Light Field Quality Evaluation

Touradj Ebrahimi, Irene Viola

The recent advances in light field acquisition and rendering technologies have attracted a lot of interest from the scientific community. Due to their large amount of data, efficient compression of light field content is of paramount importance for storage ...

2018

JPEG Pleno: a standard framework for representing and signalling plenoptic modalities

Touradj Ebrahimi

In recent years, we have observed the advent of plenoptic modalities such as light fi elds, point clouds and holography in many devices and applications. Besides plenty of technical challenges brought by these new modalities, a particular challenge is aris ...

SPIE-INT SOC OPTICAL ENGINEERING2018

Quality assessment of compression solutions for ICIP 2017 Grand Challenge on light field image coding

Touradj Ebrahimi, Irene Viola

In recent years, the research community has witnessed a growing interest in immersive representations of the real world, such as light field. However, due to the increased volume of data generated in the acquisition, new and efficient compression algorithm ...

2018

VALID: Visual quality Assessment for Light field Images Dataset

Touradj Ebrahimi, Irene Viola

In the last years, light field imaging has experienced a surge of popularity among the scientific community for its capability of rendering the 3D world in a more immersive way. In particular, several compression algorithms have been proposed to efficientl ...

2018

A new objective metric to predict image quality using deep neural networks

Touradj Ebrahimi, Pinar Akyazi

Quality assessment of images is of key importance for media applications. In this paper we present a new objective metric to predict the quality of images using deep neural networks. The network makes use of both the color information as well as frequency ...

2018

Benchmarking of Objective Quality Metrics for Colorless Point Clouds

Touradj Ebrahimi, Evangelos Alexiou

Recent advances in depth sensing and display technologies, along with the significant growth of interest for augmented and virtual reality applications, lay the foundation for the rapid evolution of applications that provide immersive experiences. In such ...

IEEE2018

Evaluation of ICtCp color space and an Adaptive Reshaper for HDR and WCG

Touradj Ebrahimi, Martin Rerabek, Anne-Flore Nicole Marie Perrin

New emerging technologies in the field of multimedia, such as high dynamic range and wide color gamut, challenge the performance of existing image and video data processing algorithms, especially in terms of visual data compression and its faithful represe ...

2018

Impact of Visualisation Strategy for Subjective Quality Assessment of Point Clouds

Touradj Ebrahimi, Evangelos Alexiou

Point clouds have recently emerged as a promising and practical solution to code 3D visual information for immersive applications. Among other challenges, objective and subjective quality assessments are still open problems for this type of visual data rep ...

2018

Quality assessment of an HDR dual-layer backward-compatible codec compared to uncompromised SDR and HDR solutions

Touradj Ebrahimi, Martin Rerabek, Anne-Flore Nicole Marie Perrin

Broadcasting high dynamic range (HDR) video has been demonstrated as largely preferred when compared to standard dynamic range (SDR), mainly due to its capability of representing more details in dark and bright regions. Additionally, progress over the last ...

2018

MMHealth 2017 Workshop on Multimedia for Personal Health and Health Care

Touradj Ebrahimi, Jean-Pierre Meyer

IEEE COMPUTER SOC2018

A graph learning approach for light field image compression

Pascal Frossard, Touradj Ebrahimi, Hermina Petric Maretic, Irene Viola

In recent years, light field imaging has attracted the attention of the academic and industrial communities thanks to its enhanced rendering capabilities that allow to visualise contents in a more immersive and interactive way. However, those enhanced capa ...

Spie-Int Soc Optical Engineering2018

Overview of the JPEG XS core coding system subjective evaluations

Touradj Ebrahimi, Benoît Macq, Irene Viola, Jakub Pospisil

The JPEG committee (Joint Photographic Experts Group, formally known as ISO/IEC SC29 WG1) is currently in the process of standardizing JPEG XS, a new interoperable solution for low-latency, lightweight and visually lossless compression of image and video. ...

Spie-Int Soc Optical Engineering2018

Media content processing method

Touradj Ebrahimi, Lin Yuan

The present invention concerns a method of encoding a media bitstream of a media content. The media bitstream comprises a payload portion for the media content, and an overhead portion, different from the payload portion. The method comprises the steps of: ...

2017

A simple method to obtain visual attention data in head mounted virtual reality

Touradj Ebrahimi, Evgeniy Upenik

Automatic prediction of salient regions in images is a well developed topic in the field of computer vision. Yet, virtual reality omnidirectional visual content brings new challenges to this topic, due to a different representation of visual information an ...

IEEE2017

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