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Publications

Publications by Miguel Correia Melo

2013

Digital Services in Immersive Urban Virtual Environments

Authors
Meira, C; Freitas, J; Barbosa, L; Melo, M; Bessa, M; Magalhaes, L;

Publication
PROCEEDINGS OF THE 2013 8TH IBERIAN CONFERENCE ON INFORMATION SYSTEMS AND TECHNOLOGIES (CISTI 2013)

Abstract
Virtual Environments (VE) systems may provide a new way to deliver information and services in many areas, for example in tourism, urban planning and education. In urban VE there is a close link between the virtual environment and the urban environment that are intended to represent. These VE can be an intuitive way to access a set of services with a direct association to the real object or entity to which they are related. In this article, we describe a case study that aimed at exploring the possibility of using new interfaces to exploit and use services in urban VE with a greater sense of immersiveness. The results indicate that the VE interfaces are a natural and intuitive access to digital services. While users have felt a greater difficulty in performing some of the tasks in immersive scenario, the majority considered that this scenario provided a greater sense of immersion and realism.

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

2016

Evaluating Selection, Manipulation and Navigation Tasks by People with Intellectual Disabilities Learning level comparison of user interaction performance with digital content

Authors
Rocha, T; Bessa, M; Melo, M; Barroso, J; Cabral, L;

Publication
2016 23RD PORTUGUESE MEETING ON COMPUTER GRAPHICS AND INTERACTION (EPCGI)

Abstract
This paper presents a study on the evolution of digital skills of a group of people with intellectual disabilities, when performing tasks such as painting, making puzzles, playing games, or word search. For the effect, we compare results in two assessment moments: in the first one, the group with intellectual disabilities had little or no experience as regards as performing universal tasks (selection, manipulation and navigation) and with the Web; in the second one, the group had some experience obtained within the 6 months after the first assessment moment. We aimed at evaluating the evolution of their digital skills by comparing the two assessment moments through the following usability variables: successful conclusion of activities, type of difficulties found, errors, satisfaction, motivation and autonomy indicators. The results revealed that participants showed learning skills when performing all the three universal tasks (namely: selection, manipulation and navigation) which is indicated by the number of participants that was able to conclude the activities, also confirmed by the prominent results of the second assessment moment. When it comes to errors, they made more errors in the first assessment moment, in general. When handling the input devices the participants had a better performance with the mouse than the keyboard. On the other hand, they improved their keyboard handling. However, it was observed that it is not a device that they can be autonomous with due to their reading/writing difficulties, which itself represents a didactic challenge when it comes to the very presentation of appropriate methodologies and techniques that may help them overcome such problem.

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

2017

Impact of different display devices and types of virtual environments on emotions and feeling of presence

Authors
Bessa, M; Coelho, H; Melo, M; Pinto, M;

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

Abstract

2017

Multisensory virtual environment for firefighter training simulation: Study of the impact of haptic feedback on task execution

Authors
Barbosa, L; Monteiro, P; Pinto, M; Coelho, H; Melo, M; Bessa, M;

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

Abstract

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