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5 Papers

ON-LINE 3D BODY MODELLING FOR AUGMENTED REALITY

Topics: Augmented, Mixed and Virtual Environments; Modeling and Algorithms; Scene and Object Modeling

Authors: Luis Almeida 1 , Paulo Menezes 2 and Jorge Dias 2

Affiliations: 1 University of Coimbra and Institute Polytechnic of Tomar, Portugal , 2 University of Coimbra, Portugal

Digital Object Identifier: 10.5220/0003866304720479

Proceedings of GRAPP 2012/VISIGRAPP, ISBN: 978-989-8565-02-0

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Building 3D body models is an important task for virtual and augmented reality applications in telerehabilitation, education, 3DTV, entertainment and tele-presence. We propose a real-time full 3D reconstruction system that combines visual features and shape-based alignment using low cost depth sensor and video cameras targeting three-dimensional conferencing applications. With this approach we overcome the classic video based reconstruction problem in low-texture or repeated pattern regions. Alignment between successive frames is computed by jointly optimizing over both appearances and shape matching. Appearance-based alignment is done over 2D SURF features annotated with 3D position. Shape-based alignment is performed using the motion transformation estimation between consecutive annotated 3D point clouds through a linear method. A solution to avoid wrong annotated 3D matched points is proposed. 3D mesh model representation is used to lower the processed data and create a 3D representation that is independent of view-point.
Collapse Button Related Ontology Subjects/Areas/Topics (6)
Augmented, Mixed and Virtual Environments

Geometry and Modeling

Modeling and Algorithms

Computer Vision, Visualization and Computer Graphics

Interactive Environments

Scene and Object Modeling

AdaptO - Adaptive Multimodal Output

Topics: Human and Computer Interaction; Context-Aware Applications; Pervasive Health; Distributed Intelligent Agents

Authors: António Teixeira 1 , Carlos Pereira 1 , Miguel Oliveira e Silva 1 , Osvaldo Pacheco 1 , António Neves 1 and José Casimiro 2

Affiliations: 1 University of Aveiro, Portugal , 2 Polytechnic Institute of Tomar, Portugal

Digital Object Identifier: 10.5220/0003372500910100

Proceedings of PECCS 2011, ISBN: 978-989-8425-48-5

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Currently, most multimodal output mechanisms use a very centralized architecture in which the various output modalities are completely devoid of any autonomy. Our proposal, AdaptO, uses an alternative approach, proving output modalities with the capacity to make decisions, thus collaborating with the fission output mechanism towards a more effective, modular, extensible and decentralized solution. In addition, our aim is to provide the mechanisms for a highly adaptable and intelligent multimodal output system, able to adapt itself to changing environment conditions (light, noise, distance, etc.) and to its users needs, limitations and personal choices.
Collapse Button Related Ontology Subjects/Areas/Topics (13)
Applications and Services

Enterprise Information Systems

Paradigm Trends

Computer Vision, Visualization and Computer Graphics

Human and Computer Interaction

Pervasive Health

Context

Human-Computer Interaction

Software Engineering

Context-Aware Applications

Mobile and Pervasive Computing

Telecommunications
Distributed Intelligent Agents

STEREO VISION HEAD VERGENCE USING GPU CEPSTRAL FILTERING

Topics: Real-Time Vision; Active and Robot Vision

Authors: Luis Almeida 1 , Paulo Menezes 2 and Jorge Dias 2

Affiliations: 1 Institute Polytechnic of Tomar, Portugal , 2 University of Coimbra, Portugal

Digital Object Identifier: 10.5220/0003319406650670

Proceedings of VISAPP 2011/VISIGRAPP, ISBN: 978-989-8425-47-8

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Vergence ability is an important visual behavior observed on living creatures when they use vision to interact with the environment. The notion of active observer is equally useful for robotic vision systems on tasks like object tracking, fixation and 3D environment structure recovery. Humanoid robotics are a potential playground for such behaviors. This paper describes the implementation of a real time binocular vergence behavior using cepstral filtering to estimate stereo disparities. By implementing the cepstral filter on a graphics processing unit (GPU) using Compute Unified Device Architecture (CUDA) we demonstrate that robust parallel algorithms that used to require dedicated hardware are now available on common computers. The cepstral filtering algorithm speed up is more than sixteen times than on a current CPU. The overall system is implemented in the binocular vision system IMPEP (IMPEP Integrated Multimodal Perception Experimental Platform) to illustrate the system performance experimentally.
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Active and Robot Vision

Motion, Tracking and Stereo Vision

Real-Time Vision
Computer Vision, Visualization and Computer Graphics

A LOW-COST EEG STAND-ALONE DEVICE FOR BRAIN COMPUTER INTERFACE

Topics: Biomedical Instrumentation; Embedded Signal Processing

Authors: Alexandre Ribeiro 1 , António Sirgado 1 , João Aperta 1 , Ana Lopes 1 , Jorge Guilherme 1 , Pedro Correia 1 , Gabriel Pires 1 and Urbano Nunes 2

Affiliations: 1 Polytechnic Institute of Tomar, Portugal , 2 University of Coimbra, Portugal

Digital Object Identifier: 10.5220/0001780304300433

Proceedings of BIODEVICES 2009/BIOSTEC, ISBN: 978-989-8111- 64-7

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This paper describes the ongoing development and design of a portable and stand-alone EEG device to be used as a Brain Computer Interface (BCI) for wheelchair steering. The overall system comprises the EEG (electroencephalogram) amplifier, data acquisition, communications and stimuli generator. The main attractive feature of this system is its stand-alone operation which makes it independent of a computer for signal processing and visual stimuli presentation. Preliminary results obtained from experiments exploring alpha rhythms and steady state visual evoked potentials attest the overall functionality and robustness of the system.
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Biomedical Engineering

Biomedical Instruments and Devices

Embedded Signal Processing
Biomedical Instrumentation

QGM – A SYSTEM TO IMPROVE MATHS e-LEARNING

Topics: Web-Based Learning, Wikis and Blogs; Authoring Tools and Content Development; Computer-Aided Assessment

Authors: José Casimiro Pereira 1 and Joaquim Sousa Pinto 2

Affiliations: 1 Instituto Politécnico de Tomar, Portugal , 2 Universidade de Aveiro, Portugal

Digital Object Identifier: 10.5220/0001976302590265

Proceedings of CSEDU 2009, ISBN: 978-989-8111-82-1

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The main goal of Projecto Matemática Ensino (Mathematics Teaching Project) – PmatE – is to promote the learning of mathematics. To achieve that, PmatE has been developing since 1990 an internet project especially designed to increase the interest of students in the discipline. The core of the Project anchors on the so-called “Questions Generator Model” (from the Portuguese “Modelo Gerador de Questões”). Each “model” is a tool based on parameterized expressions, which usually allows thousands of different questions to be generated (different formulations of the same “model”) formally equivalent in terms of pedagogic content. The scope of this paper is to redesign the former “model” using the IEEE LOM’s structure to define the learning object and redefine the model structure itself to allow for independence of the technological platform used to support the Project.
Collapse Button Related Ontology Subjects/Areas/Topics (7)
Authoring Tools and Content Development

e-Learning

Learning/Teaching Methodologies and Assessment

Computer-Aided Assessment

Information Technologies Supporting Learning

Web-Based Learning, Wikis and Blogs
Computer-Supported Education

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