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Publications

Publications by CRIIS

2012

Global localisation algorithm from a multiple hypotheses set

Authors
Pinto, M; Sobreira, H; Moreira, AP; Mendonca, H;

Publication
Proceedings - 2012 Brazilian Robotics Symposium and Latin American Robotics Symposium, SBR-LARS 2012

Abstract
In this paper, a new fast and computationally light weight methodology is proposed to pinpoint a robot in a structured scenario. The localisation algorithm performs a tracking routine to pinpoint the robot's position as it moves in a known map. To perform such tracking routine, it is necessary to know the initial position of the vehicle. This paper briefly describes the tracking routine and presents a solution to pinpoint that initial position in an autonomous way. Experimental results on the performance of the proposed methodology are presented in this paper in two different scenarios: 1) in the Middle Size Soccer Robotic League (MSL), with artificial vision data from an omni directional robot, and 2) in an indoor environment with a Laser Range Finder data from a differential traction robot (called Robot Vigil). © 2012 IEEE.

2012

Pseudo Fuzzy colour calibration for sport video segmentation

Authors
Santiago, CB; Sousa, A; Reis, LP;

Publication
COMPUTATIONAL VISION AND MEDICAL IMAGE PROCESSING: VIPIMAGE 2011

Abstract
Video segmentation is one of the most important parts of a vision system which allows partitioning each frame into homogeneous regions that share a common property. This work proposes a new methodology that aggregates three different techniques: background subtraction, region growing and a pseudo Fuzzy colour model to define colour subspaces that characterize each class. In addition, the pseudo Fuzzy colour model allows a given colour to belong to more than one class and enables the expansion ofthe classes through a dynamic model based on belonging and persistence information. In case of shared colours among classes, regional features are searched in order to determine the object's class. Tests with test and real videos of sports footages show promising results.

2012

Tracking Players in Indoor Sports Using a Vision System Inspired in Fuzzy and Parallel Processing

Authors
B., C; Gomes, L; Sousa, A; Paulo, L; Luisa, M;

Publication
Cutting Edge Research in New Technologies

Abstract

2012

Overcoming Motor-Rate Limitations in Online Synchronized Robot Dancing

Authors
Santiago, CB; Oliveira, JL; Reis, LP; Sousa, A; Gouyon, F;

Publication
INTERNATIONAL JOURNAL OF COMPUTATIONAL INTELLIGENCE SYSTEMS

Abstract
We propose an online sensorimotor architecture for controlling a low-cost humanoid robot to perform dance movements synchronized with musical stimuli. The proposed architecture attempts to overcome the robot's motor constraints by adjusting the velocity of its actuators and inter-changing the attended beat metrical-level on-the-fly. Moreover, we propose quantitative metrics for measuring the level of beat-synchrony of the generated robot dancing motion and complement them with a qualitative survey about several aspects of the demonstrated robot dance performances. Tests with different dance movements and musical pieces demonstrated satisfactory beat-synchrony results despite the physical limitations of the robot. The comparison against robot dance sequences generated without inter-changing the attended metrical-level validated our sensorimotor approach for controlling beat-synchronous robot dancing motions using different dance movements and facing distinct musical tempo conditions.

2012

Optimization Approach for the Development of Humanoid Robots' Behaviors

Authors
Cruz, L; Reis, LP; Lau, N; Sousa, A;

Publication
ADVANCES IN ARTIFICIAL INTELLIGENCE - IBERAMIA 2012

Abstract
Humanoid robots usually have a large number of degrees of freedom which turns humanoid control into a very complex problem. Humanoids are used in several RoboCup soccer leagues. In this work, the SimSpark simulator of the Simulation 3D will be used. This paper presents an automatic approach for developing humanoid behaviors based on the development of a generic optimization system. The paper describes the adopted architecture, main design choices and the results achieved with the optimization of a side kick and a forward kick. For both skills, the optimization approach allowed the creation of faster and more powerful and stable behaviors.

2012

Virtual Centre for the Rehabilitation of Road Accident Victims (VICERAVI)

Authors
Mendes, L; Dores, AR; Barbosa, F; Rego, PA; Moreira, PM; Reis, LP; Viana, J; Coelho, A; Sousa, A;

Publication
7TH IBERIAN CONFERENCE ON INFORMATION SYSTEMS AND TECHNOLOGIES (CISTI 2012)

Abstract
The main objective of this work is to describe the Virtual Center for the Rehabilitation of Road Accident Victims - VICERAVI and the serious games it includes for the purpose of neuropsychological rehabilitation. The validation of the VICERAVI as a rehabilitation system involves 30 participants of both sexes, with brain injury due to road accidents. The applicability and the benefits of virtual worlds for a holistic neuropsychological rehabilitation will be tested using virtual reality (OpenSimulator) to simulate tasks of everyday life, enabling participants to perform cognitive and social skills training through their avatars. The progresses of this group will be compared with a group of conventional neuropsychological rehabilitation. The main innovation of the work is the possibility of administering neuropsychological rehabilitation at distance, via ecological virtual environments. Moreover, the paper discusses also relevant criteria and issues in respect to the use of serious games, simulation and virtual environments in rehabilitation.

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