Browsing by Author "Duarte, Carlos"

Now showing 1 - 6 of 6
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    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, Beatriz
    The 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.
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    Avaliação de Interfaces Multimodais para Livros Falados Digitais com foco Não Visual
    (The Eurographics Association, 2021) Duarte, Carlos; Chambel, Teresa; Simões, Hugo; Carriço, Luís; Santos, Eduardo; Francisco, Guilherme; Neves, Sérgio; Rua, Ana Catarina; Robalo, João; Fernandes, Tiago; Chambel, Teresa and Nunes, Nuno and Romao, Teresa and Creissac Campos, José
    Este artigo apresenta um estudo de avaliação de interfaces multimodais para Livros Falados Digitais, tendo em conta diversos tipos de utilização, inspirados quer por diferentes características dos utilizadores quer pelas situações de uso. São apresentados: uma análise de trabalhos relevantes na área e requisitos a ter em conta; o Rich Book Player, um dispositivo de reprodução de livros falados digitais, multimodal e adaptativo; e um estudo de usabilidade das suas funcionalidades e capacidades de interacção, com ênfase em aspectos não visuais.
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    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, Beatriz
    A 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.
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    On the road to Rich Digital Books
    (The Eurographics Association, 2021) Lopes, Rui; Duarte, Carlos; Simões, Hugo; Carriço, Luís; Chambel, Teresa and Nunes, Nuno and Romao, Teresa and Creissac Campos, José
    This article presents an architecture for producing rich digital books. These are books enriched with supporting media, like images and sound, to reach broader audiences and enlarge their usage possibilities. The architecture is based on automating the books' production process, increasing their availability. It also enjoys a high flexibility degree, allowing the production of books that can be read either with off-the-shelf software or specialized digital book players. One such player, capable of meeting the demands of active reading is also presented in this article.
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    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, Beatriz
    Multimodal 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.
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    Usability Evaluation of Digital Talking Books
    (The Eurographics Association, 2021) Duarte, Carlos; Carriço, Luís; Carriço, Luís and Correia, Nuno and Antunes, Pedro and Jorge, Joaquim
    ln this paper we present the results of a set of usability evaluation studies on Digital Talking Books. Digital Talking Books aim to provide better access to literary content for the blind and visually impaired. Departing from their digital base, we developed enriched books, targeting broader audiences and usage situations. The books can be enriched with different media content, like images and sounds, supporting multimodal interaction and multimedia presentation. Enlarging the number of interaction possibilities, while making the books more attractive, also increases the possibility of usability problems. This is why it is so important to perform usability evaluation of the generated interfaces. A special focus of the evaluation was given to the synchronization related issues. Synchronization flaws detected by the users were the cause of discomfort and loss of concentration. Alternative synchronization visual marking was employed to circumvent these problems. Tests also provided insight on what modalities are favoured by the users for specific interaction tasks, and confirmed the importance of the availability of multimodal interaction.