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Hand gesture recognition system based in computer vision and machine learning :...
Trigueiros, Paulo José de Albuquerque C.Sendo uma forma natural de interação homem-máquina, o reconhecimento de gestos implica uma forte componente de investigação em áreas como a visão por computador e a aprendizagem computacional. O reconhecimento gestual é uma área com aplicações muito diversas, fornecendo aos utilizadores uma forma mais natural e mais simples de comunicar com sistemas baseados em computador, sem a necessidade de utilização de dis...
A comparative study of different image features for hand gesture machine learning
Trigueiros, Paulo; Ribeiro, António Fernando; Reis, Luis PauloVision-based hand gesture interfaces require fast and extremely robust hand detection, and gesture recognition. Hand gesture recognition for human computer interaction is an area of active research in computer vision and machine learning. The primary goal of gesture recognition research is to create a system, which can identify specific human gestures and use them to convey information or for device control. In...
Vision-based gesture recognition system for human-computer interaction
Trigueiros, Paulo; Ribeiro, António Fernando; Reis, Luis PauloHand gesture recognition, being a natural way of human computer interaction, is an area of active research in computer vision and machine learning. This is an area with many different possible applications, giving users a simpler and more natural way to communicate with robots/systems interfaces, without the need for extra devices. So, the primary goal of gesture recognition research is to create systems, which...
Vision based referee sign language recognition system for the RoboCup MSL league
Trigueiros, Paulo; Ribeiro, António Fernando; Reis, Luis PauloIn RoboCup Middle Size league (MSL) the main referee uses assisting technology, controlled by a second referee, to support him, in particular for conveying referee decisions for robot players with the help of a wireless communication system. In this paper a vision-based system is introduced, able to interpret dynamic and static gestures of the referee, thus eliminating the need for a second one. The referee's g...
Robot orientation with histograms on MSL
Ribeiro, António Fernando; Lopes, Gil; Pereira, Bruno; Silva, João; Ribeiro, Paulo Rogério de Almeida; Costa, João; Silva, Sérgio; Rodrigues, JoãoOne of the most important tasks on robot soccer is localization. The team robots should self-localize on the 18 x 12 meters soccer field. Since a few years ago the soccer field has increased and the corner posts were removed and that increased the localization task complexity. One important aspect to take care for a proper localization is to find out the robot orientation. This paper proposes a new technique to...
Vision-based hand segmentation techniques for human-robot interaction for real-...
Trigueiros, Paulo; Ribeiro, António Fernando; Lopes, GilOne of the most important tasks in hand recognition applications for human-robot interaction is hand segmen-tation. This work presents a method that uses a Microsoft Kinect camera, for hand localization and segmenta-tion. One important aspect for robot control besides hand localization is hand orientation, which is used in this work to control robot heading direction (left or right) and linear velocity. The sys...
Vision-based hand wheel-chair control
Trigueiros, Paulo; Ribeiro, António FernandoSeveral studies have shown that people with disabilities benefit substantially from access to a means of independent mobility and assistive technology. Researchers are using technology originally developed for mobile robots to create easier to use wheelchairs. With this kind of technology people with disabilities can gain a degree of independence in performing daily life activities. In this work a computer visi...
A comparison of machine learning algorithms applied to hand gesture recognition
Trigueiros, Paulo; Ribeiro, António Fernando; Reis, Luis PauloHand gesture recognition for human computer interaction is an area of active research in computer vision and machine learning. The primary goal of gesture recognition research is to create a system, which can identify specific human gestures and use them to convey information or for device control. This paper presents a comparative study of four classification algorithms for static hand gesture classification u...
Minho MSL : a new generation of soccer robots
Ribeiro, António Fernando; Lopes, Gil; Costa, João; Rodrigues, João Pedro; Pereira, Bruno; Silva, João; Silva, Sérgio; Ribeiro, Paulo; Trigueiros, PauloThis paper describes the new generation of Minho Team robots since the last RoboCup participation. Robots have been rebuilt from top to bottom, keeping the essence of the previous generation, but lighter, faster, improved sight, new algorithms and new technology. The demands of RoboCup MSL are very high and a new breed of robots was necessary to cope with it. This paper describes a bottom-up view of the robot, ...
Visualização tridimensional de imagem médica
Trigueiros, Paulo; Ribeiro, António Fernando; Ramos, IsabelNeste artigo abordamos os passos necessários para se conseguir a visualização tridimensional (3-D) de volumes de dados adquiridos em sistemas de imagem médica. A reconstrução 3D tem inúmeras vantagens pois permite fornecer ao cirurgião as dimensões, relações topográficas, orientação e volume das diferentes estruturas ou lesões. Desta forma é possivel uma visualização prévia, que permite auxiliar na tomada de de...
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