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Details

  • Name

    Maximino Bessa
  • Cluster

    Computer Science
  • Role

    Senior Researcher
  • Since

    01st March 2009
002
Publications

2018

Image-type representation: A preliminary study on preferences of users with intellectual disabilities

Authors
Rocha, T; Bessa, M; Bastardo, R; Magalhaes, L;

Publication
INTERNATIONAL JOURNAL OF HUMAN-COMPUTER STUDIES

Abstract
Previous findings have shown that users with intellectual disabilities navigate the Web more easily and with greater interest when images are used to represent hyperlinks (Rocha, 2008; 2014; Rocha et al., 2012). Although images can be better for navigation purposes, there is a need to understand how these images should be designed to enhance users' interaction with digital content for this particular group of people. The purpose of this study is to measure the user's preference for image-type representation (Object, Action and Universe), within four different categories (music, movies, sports, games). The sample consisted of 20 individuals with intellectual disabilities, their ages ranging from 22 to 49 years old. The results showed that they preferred less complex images, namely object representative images, and that categories had no effect.

2018

The effects of body position on Reflexive Motor Acts and the sense of presence in virtual environments

Authors
Bessa, M; Melo, M; Augusto de Sousa, A; Vasconcelos Raposo, J;

Publication
Computers and Graphics (Pergamon)

Abstract
The purpose of this study was to measure the subject's sense of presence while they performed a task (riding a bicycle downhill) in a virtual reality (VR) environment and to compare it by body position (standing vs. sitting) and gender. The sample consisted of 35 subjects (19 male and 16 female) between 17 and 33 years of age. A translated and validated Portuguese version of the Igroup Presence Questionnaire (IPQp) and the Reflexive Motor Acts (RMAs), based on direct observation, were used as metrics. The results showed significant differences between body position at the level of Experienced Realism, Spatial Presence and Overall Sense of Presence. When measuring RMAs, it was demonstrated that people in the sitting position presented a higher frequency. We concluded that body position influences perceptions of credibility, which has an impact on the sense of presence. No differences were identified between the genders. © 2017 Elsevier Ltd

2017

Context-aware HDR video distribution for mobile devices

Authors
Melo, M; Barbosa, L; Bessa, M; Debattista, K; Chalmers, A;

Publication
Multimedia Tools Appl.

Abstract
HDR video on mobile devices is in its infancy and there are no solutions yet that can achieve full HDR video reproduction due to computational power limitations. In this paper we present a novel and versatile solution that allows the delivery of HDR video on mobile devices by taking into account contextual information and retro-compatibility for devices that do not have the computational power to decode HDR video. The proposed solution also enables the remote transmission of HDR video to mobile devices in real-time. This context-aware HDR video distribution solution for mobile devices is evaluated and discussed by considering the impact of HDR videos over conventional low dynamic range videos on mobile devices as well as the challenge of playing HDR videos directly locally or remotely. © 2016 Springer Science+Business Media New York

2017

A Context-Aware Method for Authentically Simulating Outdoors Shadows for Mobile Augmented Reality

Authors
Barreira, J; Bessa, M; Barbosa, L; Magalhaes, L;

Publication
IEEE Transactions on Visualization and Computer Graphics

Abstract

2017

Evaluation of virtual reality navigation interfaces using the steering law

Authors
Monteiro, P; Carvalho, D; Melo, M; Branco, F; Bessa, M;

Publication
2017 24º Encontro Português de Computação Gráfica e Interação (EPCGI)

Abstract

Supervised
thesis

2016

Utilização da resposta fisiológica em ambientes de realidade virtual para aumentar o envolvimento dos utilizadores

Author
Manuel Pinto

Institution
UTAD

2016

MANY-OBJECTIVE OPTIMIZATION WITH PARTICICLE SWARM OPTIMIZATION ALGORITHM

Author
Hélio Alves Freire

Institution
UTAD

2016

DESENVOLVIMENTO DE APLICAÇÕES DE REALIDADE AUMENTADA COERENTES COM O CONTEXTO AMBIENTAL

Author
João Carlos dos Santos Barreira

Institution
UTAD

2016

PROPOSAL OF A NOVEL MULTIMODAL INTERACTION MODEL FOR USERS OF DIFFERENT AGE GROUPS

Author
Diana Carneiro Machado de Carvalho

Institution
UTAD

2016

Ambientes virtuais multissensoriais: equivalência entre treino virtual e real

Author
David  Gonçalves Narciso

Institution
UTAD