Portuguese Meeting on Computer Graphics 2010
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Browsing Portuguese Meeting on Computer Graphics 2010 by Author "Duarte, Carlos"
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Item Automatic Volume Adjustments for Mobile Media Players(The Eurographics Association, 2021) Reis, Tiago; Carriço, Luís; Duarte, Carlos; Mealha, Óscar and Madeira, Joaquim and Tércio, Daniel and Sousa Santos, BeatrizThe automatic adjustment of mobile user interfaces to the contexts in which they are used presents a possible solution for the interaction difficulties introduced by the constantly mutating characteristics of such contexts. Here we present a prototype of a portable media player. This player automatically adjusts its volume according to the users' preferences and the noise of the surrounding environment. We focus on the details of the volume adjustment algorithm and its – laboratorial and contextual - user centered evaluations. We detail the problems found on each phase of the evaluation procedure, and present a set of Wizard of Oz experiments exploring possible solutions for those problems.Item Conjuntos de Gestos de Comando para Ferramentas de Desenho em Dispositivos sem Teclado(The Eurographics Association, 2021) Gomes, Tiago; Duarte, Carlos; Carriço, Luís; Neca, Joana; Reis, Tiago; Mealha, Óscar and Madeira, Joaquim and Tércio, Daniel and Sousa Santos, BeatrizA interacção gestual, sem teclado, em aplicações de desenho, apresenta restrições mais rígidas do que em outro género de aplicações baseadas em gestos. Tal acontece, principalmente, pela necessidade de eliminar a ambiguidade existente quando um gesto representa um comando ou faz, simplesmente, parte do que está a ser desenhado. Neste artigo, exploramos conjuntos de gestos alternativos capazes de lidar com este problema. O contexto é fornecido através do ponto inicial do gesto ou, em alternativa, através de múltiplos toques no ecrã. Este artigo apresenta os resultados de uma experiência concebida para comparar dois conjuntos de gestos.Item Support for inferring user abilities for multimodal applications(The Eurographics Association, 2021) Duarte, Carlos; Feiteira, Pedro; Costa, Daniel; Costa, David; Mealha, Óscar and Madeira, Joaquim and Tércio, Daniel and Sousa Santos, BeatrizMultimodal interaction offers users the possibility to interact with computational systems using natural interaction modes. However, different users interact differently, integrating modalities in different patterns. By knowing how users exploit different modalities, we can try to build adaptive systems that will increase the effectiveness of multimodal interaction. For that we need to characterize user abilities. However, this is a time and effort consuming process, particularly in the early stages of design. We propose an approach that can be used in the early stages of the design process, by resorting to a Wizard of Oz based prototype of a multimodal system.