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Francesca De Simone

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Related publications (36)

Subjective quality assessment of scalable video coding: a survey

Touradj Ebrahimi, Francesca De Simone, Jong Seok Lee

Scalable video coding is a promising solution for efficient video content distribution to users having heterogeneous network and terminal capabilities. Thanks to its inherent multidimensional adaptability, a scalable bit stream can be used to simultaneousl ...

2011

Subjective quality assessment of H.264/AVC video streaming with packet losses

Touradj Ebrahimi, Frédéric Dufaux, Francesca De Simone

Research in the field of video quality assessment relies on the availability of subjective scores, collected by means of experiments in which groups of people are asked to rate the quality of video sequences. The availability of subjective scores is fundam ...

Hindawi Publishing Corporation2011

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

Touradj Ebrahimi, Francesca De Simone, Lutz Goldmann

2010

Gesture and Touch Controlled Video Player Interface for Mobile Devices

Touradj Ebrahimi, Francesca De Simone

2010

H.264/AVC video database for the evaluation of quality metrics

Touradj Ebrahimi, Francesca De Simone

2010

Impact of Acquisition Distortion on the Quality of Stereoscopic Images

Touradj Ebrahimi, Francesca De Simone, Lutz Goldmann

2010

Subjective evaluation of scalable video coding for content distribution

Touradj Ebrahimi, Engin Kurutepe, Francesca De Simone, Jong Seok Lee

This paper investigates the influence of the combination of the scalability parameters in scalable video coding (SVC) schemes on the subjective visual quality. We aim at providing guidelines for an adaptation strategy of SVC that can select the optimal sca ...

2010

Impact of video transcoding artifacts on the subjective quality

Touradj Ebrahimi, Mauro Lattuada, Frédéric Dufaux, Francesca De Simone, Lutz Goldmann

Video transcoding is an important step to enable interoperability between different networks, terminals, applications, and services for video communication. This paper studies the influence of typical video transcoding artifacts due to frame rate reduction ...

2010

On the Limits of Perceptually Optimized JPEG

Touradj Ebrahimi, Denis Filimonov, Francesca De Simone, Lutz Goldmann

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 ...

2010

A subjective study of the influence of color information on visual quality assessment of high resolution pictures

Touradj Ebrahimi, Frédéric Dufaux, Francesca De Simone

This paper presents the design and the results of a psychovisual experiment which aims at understanding how the color information affects the perceived quality of a high resolution still picture. The results of this experiment help to shed light into the i ...

2009

Subjective evaluation of JPEG XR image compression

Touradj Ebrahimi, Francesca De Simone, Lutz Goldmann

In this paper a procedure for subjective evaluation of the new JPEG XR codec for compression of still pictures is described in details. The new algorithm has been compared to the existing JPEG and JPEG 2000 standards when considering compression of high re ...

2009

Video coding based on audio-visual attention

Touradj Ebrahimi, Francesca De Simone, Jong Seok Lee

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 ...

2009

Influence of audio-visual attention on perceived quality of standard definition multimedia content

Touradj Ebrahimi, Francesca De Simone, Jong Seok Lee

When human subjects assess the quality of multimedia data, high level perceptual processes such as Focus of Attention (FoA) and eye movements are believed to play an important role in such tasks. While prior art reports incorporation of visual FoA into obj ...

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

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

A comparative study of JPEG 2000, AVC/H.264, and HD Photo

Touradj Ebrahimi, Mourad Ouaret, Frédéric Dufaux, Francesca De Simone

In this paper, we report a study evaluating rate-distortion performance between JPEG 2000, AVC/H.264 High 4:4:4 Intra and HD Photo. A set of ten high definition color images with different spatial resolutions has been used. Both the PSNR and the perceptual ...

2007

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