Browsing by Author "Bastos, Rafael"

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    The Arena: An lndoor Mixed Reality Space
    (The Eurographics Association, 2021) Dias, José Miguel Salles; Bastos, Rafael; Santos, Pedro; Monteiro, Luís; Canhoto, Joaquim; Carriço, Luís and Correia, Nuno and Antunes, Pedro and Jorge, Joaquim
    ln this paper we introduce the Arena, an indoor space for mobile mixed reality interaction. The Arena, includes a new user tracking system appropriate for ARJMR applications anda new Too/kit oriented to the augmented and mixed reality applications developer, the MX Too/kit. This too/kit is defined at a somewhat higher abstraction levei, by hiding from the programmer low levei implementation details and facilitating ARJMR objectoriented programming. The system handles in a uniform way, video input, video output (for head-sefs and monitors), sound aurelisation and Multimodal Human-Computer Interaction in ARJMR, including, tangible interfaces, speech recognition and gesture recognition.
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    ARTIC: Augmented Reality Tangible Interface by Color Evaluation
    (The Eurographics Association, 2021) Dias, José Miguel Salles; Jamal, Nádia; Bastos, Rafael; Silva, Pedro; Carriço, Luís and Correia, Nuno and Antunes, Pedro and Jorge, Joaquim
    We present ARTIC, a novel tangible interface that offers 3D user interaction which can be explored in the con· text of Augmented and Mixed Reality. Our system consists in tracking a portable artifact based on color evalua· tion by computer vision, and use it as a 3D input device. Using vision-based techniques, we are able to detect and track the motion of a physical object through color analysis and segmentation, and then perform virtual interactivity to the user, which is extremely important in a Tangible Augmented Reality approach.
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    Infrared Tracking System for Immersive Virtual Environments
    (The Eurographics Association, 2021) Gaspar, Filipe; Dias, Miguel Sales; Bastos, Rafael; Coelho, António and Cláudio, Ana Paula
    In this paper, we describe the theoretical foundations and engineering approach of an infrared-optical tracking system specially design for large scale immersive virtual environments (VE) or augmented reality (AR) settings. The system described is capable of tracking independent retro-reflective markers arranged in a 3D structure (artefact) in real time (25Hz), recovering all possible 6 Degrees of Freedom (DOF). These artefacts can be adjusted to the user's stereo glasses to track his/her pose while immersed in the VE or AR, or can be used as a 3D input device. The hardware configuration consists in 4 shutter-synchronized cameras attached with band-pass infrared filters and the artefacts are illuminated by infrared array-emitters. The system was specially designed to fit a room with sizes of 5.7m x 2.7m x 3.4 m, which match the dimensions of the CAVE-Hollowspace of Lousal where the system will be deployed. Pilot lab results have shown a latency of 40ms in tracking the pose of two artefacts with 4 infrared markers, achieving a frame-rate of 24.80 fps and showing a mean accuracy of 0.93mm/0.52º and a mean precision of 0.08mm/0.04º, respectively, in overall translation/rotation DOFs, fulfilling the system requirements initially defined.
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    MIXDesign, Tangible Mixed Reality for Architectural Design
    (The Eurographics Association, 2022) Salles Dias, J. Miguel; Santos, Pedro; Bastos, Rafael; Monteiro, Luis; Silvestre, Rui; Diniz, Nancy; Xavier Pueyo; Manuel Próspero dos Santos; Luiz Velho
    MIXDesign, provides a tangible Mixed-Reality system oriented towards tasks in Architectural Design, in severa! usage scenarios, such as Conceptual Design, Client Brief or even Architectural Design education. With MIXDesign, an architect can intuitively interact with a real scale model of the design, in normal working settings, where he can observe an enhanced version of the scale model, with JD virtual objects registered to the real ones. The architect is then able to use intuitive tangible interfaces, such as a paddle, to choose menu options, select a JD virtual object, transport a virtual object within the scale model surroundings and geometrically transform an object (by rotation or scaling). MIXDesign provides a platform for testing new design concepts while seamlessly transporting the Architect from Reality (RE) to Augmented Reality (AR) and then through Augmented Virtuality (AV), towards afull Virtual Environment (VE), and back, where he can perceive andjudge both the virtual and the real models, interactively and in real-time.