Palestrante: Alessandro Rodrigues e Silva (doutorando)
Orientador: Profa Mylene C. Q. Farias
Título:Perceptual quality assessment of 3D videos with stereoscopic degradations
Resumo:In the last decade, several aspects of the 3D video technology have been improved, including the 3D content production, distribution, and display. Still, the level of acceptability and popularity of 3D video applications are strongly correlated to the user Quality of Experience (QoE). Since research in this area depends heavily on data acquired in psychophysical experiments, public databases with typical stereoscopic degradations are considered important tools to researchers. Although currently there are number of available public 3D video quality databases, most of them contain only compression and transmission degradations. In this work, our first goal was to build a database (UnB-3D) that contains stereoscopic distortions. We created a set of Computer Graphics Imaging (CGI) scenes and rendered it using different parameters, generating 3D videos containing stereoscopic degradations at different strengths. Our second goal is to understand how these stereoscopic degradations are perceived by viewers. So, we performed a psychophysical experiment to analyze the perceived quality and comfort of these videos. Finally, we conducted the statistical analysis and model generation. Results shows that users that have little familiarity with 3D content have difficulties identifying stereoscopic distortions. Also, the source content has a great influence on the user’s comfort. Similarly, the 3D quality is affected by the spatial and temporal information of the content, specially when the disparity is high.
Horário: 14h30
Palestrante: Gustavo Jardim Portella (doutorando)
Orientador: Profa Alba Melo
Título: A Hybrid Strategy for Balanced Cost and Availability at the Cloud Spot Market
Resumo:In the Amazon EC2 cloud provider, the price of spot instances is much lower than on demand instances, however, at the cost of availability issues of the former. Recently, several strategies were proposed to analyze the Amazon EC2 spot pricing model, employing techniques such as statistical and probabilistic modeling and neural networks. And yet, to the best of our knowledge, there is no work in the literature that can accurately capture the trade-off between price and availability in favor of user decision-making. In this work, we propose and evaluate a utility-based strategy that balances spot instance cost and availability to Amazon EC2 users, for immediate bidding. Moreover, our strategy also provides a recommendation mechanism based on day of the week, that considers the more appropriate day to hire a given instance.
Horário: 15h
Palestrante: Luiz Gustavo Soares de Sá (mestrando)
Orientador: Prof Ricardo Pezzuol Jacobi
Título: Análise e Otimização de Descrições de Hardware usando Tipos de Sessão Temporais
Resumo: Uso de uma descrição formal de hardware baseada em tipos de sessão (session types) temporais que serve como representação intermediária para que sistemas de síntese de alto nível possam analisar e otimizar arquiteturas de hardware eficientemente.
Local: Teams MS - Equipe PPGI-316415 Seminário, Canal Seminários 1-2020
Profa Célia Ghedini Ralha (Este endereço de email está sendo protegido de spambots. Você precisa do JavaScript ativado para vê-lo.)
Coordenadora Seminários de Pós-Graduação em Informática 1-2020