Francesca De Simone

Learn More
—Extensive adoption of video surveillance, affecting many aspects of the daily life, alarms the concerned public about the increasing invasion into personal privacy. Therefore, to address privacy issues, many tools have been proposed for protection of personal privacy in image and video. However, little is understood regarding the effectiveness of such(More)
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 scalability options for resource-constrained networks. Extensive subjective tests are conducted by using(More)
This paper describes a publicly available database of subjective scores, relative to quality assessment of 156 video streams encoded with H.264/AVC and corrupted by simulating packet losses over an error-prone network. The data has been collected in controlled test environments at the premises of two academic institutions. A detailed statistical analysis of(More)
—Scalable video coding is a powerful solution for content delivery in many interactive multimedia services due to its adaptability to varying terminal and network constraints. In order to successfully exploit such adaptability, it is necessary to understand users' preference among various scalability options and consequently develop an optimal bit rate(More)
Keywords: Subjective quality assessment Subjective test Statistical analysis High definition (HD) Video coding High efficiency video coding (HEVC) Joint collaborative team on video coding (JCT-VC) H.264/MPEG-4 AVC a b s t r a c t This paper describes the details and the results of the subjective quality evaluation performed at EPFL, as a contribution to the(More)
Keywords: Video coding Audiovisual focus of attention Quality of experience Audiovisual source localization H.264/AVC Flexible macroblock ordering (FMO) Canonical correlation analysis Subjective quality assessment a b s t r a c t This paper proposes an efficient video coding method using audiovisual focus of attention, which is based on the observation that(More)
High Efficiency Video Coding (HEVC) is the latest attempt by ISO/MPEG and ITU-T/VCEG to define the next generation compression standard beyond H.264/MPEG-4 Part 10 AVC. One of the major goals of HEVC is to provide efficient compression for resolutions beyond HDTV. However, the subjective evaluations that led to the selection of technologies were bound to(More)
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 fundamental to enable validation and comparative benchmarking of the objective algorithms that try to predict(More)