Portuguese Meeting on Computer Graphics 2004
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Browsing Portuguese Meeting on Computer Graphics 2004 by Author "Jorge, Joaquim A."
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Item Design and Evaluation of a Spoken-Feedback Keyboard(The Eurographics Association, 2021) Campos, André; Branco, Pedro; Jorge, Joaquim A.; Carriço, Luís and Correia, Nuno and Antunes, Pedro and Jorge, JoaquimSpeech recognition technologies have come a long way in the past generation. Indeed, they are becoming ever more pervasive in our day-to-day lives, especially in the form of voice-activated menus so prevalent in many automated answering systems. However, speech technologies are still of limi ted usefulness for large-vocabulary speaker-independent applications in noisy environments, especially where relatively limited computing resources are available as in present-day personal digital assistants (PDAs). Given the popularity of digital cellular phones and text-messaging systems, we describe a generic interface that can be used by any application that need text input by visually-impaired users on this kind of devices. Given the shortcomings of present-day speech recognition technology, we opted to develop three types ofkeyboards, two predictive, with vocalfeedback. This paper, describes the interface development and the usability evalualion results with target users. Our prototype testing scenario included composing short text messages (SMS), and sending them via digital cellular networks (GSM) making it accessible to visually-impaired people.Item Recuperação de Objectos VRML por esboço(The Eurographics Association, 2021) Brito, Tiago; Fonseca, Manuel J.; Jorge, Joaquim A.; Carriço, Luís and Correia, Nuno and Antunes, Pedro and Jorge, JoaquimEste artigo compara a utilização de dois métodos de descrição de formas para a realização de um motor de busca de objectos tridimensionais, utilizando os seus contornos como meio de pesquisa a partir de um esboço criado pelo utilizador. A informação sobre cada objecto é obtida na forma de descritores gerados pela biblioteca de reconhecimento CALI ou utilizando Momentos de Zernike. Cada objecto tridimensional é processado apenas uma vez, sendo criadas dez vistas de cada objecto. Estas são depois utilizadas para calcular os contornos exteriores dos objectos, que servirão para criar os descritores atrás referidos.