Encontrados 46 documentos, a visualizar página 1 de 5
A biological and real-time framework for hand gestures and head poses
Saleiro, Mário; Farrajota, Miguel; Terzic, Kasim; Rodrigues, J. M. F.; du Buf, J. M. H.Human-robot interaction is an interdisciplinary research area that aims at the development of social robots. Since social robots are expected to interact with humans and understand their behavior through gestures and body movements, cognitive psychology and robot technology must be integrated. In this paper we present a biological and real-time framework for detecting and tracking hands and heads. This framewor...
A low-cost classroom-oriented educational robotics system
Saleiro, Mário; Carmo, Bruna; Rodrigues, J. M. F.; du Buf, J. M. H.Over the past few years, there has been a growing interest in using robots in education. The use of these tangible devices in combination with problem-based learning activities results in more motivated students, higher grades and a growing interest in the STEM areas. However, most educational robotics systems still have some restrictions like high cost, long setup time, need of installing software in children'...
Detection, classification and localisation of football players and ball from ha...
Vilas, Tiago; Rodrigues, J. M. F.; Cardoso, PedroThe current performance requirements in football make imperative the use of new technologies for game observation and analysis, providing detailed information about the team's actions. This paper presents in resume an algorithm to collect information from Handycam videos, namely, the football pitch, player and ball detection, player classification within the team, the tracking and localisation of players and ba...
Biological models for active vision: towards a unified architecture
Terzic, Kasim; Lobato, David; Saleiro, Mário; Martins, Jaime A.; Farrajota, Miguel; Rodrigues, J. M. F.; du Buf, J. M. H.Building a general-purpose, real-time active vision system completely based on biological models is a great challenge. We apply a number of biologically plausible algorithms which address different aspects of vision, such as edge and keypoint detection, feature extraction,optical flow and disparity, shape detection, object recognition and scene modelling into a complete system. We present some of the experiment...
Detection of indoor and outdoor stairs
Shahrabadi, S.; Rodrigues, J. M. F.; du Buf, J. M. H.There are a few applications in which stairs must be detected, for example for aiding blind persons during navigation and for autonomous robots which must rely on vision. . In this paper we present a very simple algorithm for detecting stairs, both in indoor and outdoor environments, when the camera is at a distance of approximately five meters from the stairs. The problem is hard to solve due to different factor...
Fast cortical keypoints for real-time object recognition
Terzic, Kasim; Rodrigues, J. M. F.; du Buf, J. M. H.Best-performing object recognition algorithms employ a large number features extracted on a dense grid, so they are too slow for real-time and active vision. In this paper we present a fast cortical keypoint detector for extracting meaningful points from images. It is competitive with state-of-the-art detectors and particularly well-suited for tasks such as object recognition. We show that by using these points...
Keypoint clustering using cortical colour opponency
Farrajota, Miguel; Rodrigues, J. M. F.; du Buf, J. M. H.Coloured regions can be segregated by using colour-opponency mechanisms, colour contrast, saturation or luminance. This paper focuses on clustering coloured regions by using colour tuned end-stopped cells. Colouinformation is coded in separate colour channels to convey differently coloured regions. Then, by using multi-scale cortical end-stopped cells tuned to colour, this information is coded in all channels b...
Open source technologies involved in constructing a web-based football informat...
Rodrigues, Pedro; Belguinha, António; Gomes, Carlos; Cardoso, Pedro; Vilas, Tiago; Mestre, Renato; Rodrigues, J. M. F.The current information systems and match analysis software associated to professional football output a huge amount of statistics. Many football professionals are particularly interested in real time information about the tactical plan occurring during the match, and the relations between that information and what was prepared in the training sessions. It is fundamental to have on the bench, and on-the-fly, th...
Phase-differencing in stereo vision: solving the localisation problem
du Buf, J. M. H.; du Buf, J. M. H.; Tersic, K.; Rodrigues, J. M. F.; Rodrigues, J. M. F.Complex Gabor filters with phases in quadrature are often used to model even- and odd-symmetric simple cells in the primary visual cortex. In stereo vision, the phase difference between the responses of the left and right views can be used to construct a disparity or depth map. Various constraints can be applied in order to construct smooth maps, but this leads to very imprecise depth transitions. In this theor...
PoolLiveAid: augmented reality pool table to assist inexperienced players
Alves, R.; Sousa, L.; Rodrigues, J. M. F.PoolLiveAid is an augmented reality tool designed to assist unskilled or amateur pool, or snooker or billiards players in predicting trajectories. A camera placed above the table acquires and processes the game on-the-fly. The system detects the table border, the ball's position an the pool cue direction in order to compute the predictable trajectory of the white ball, and the ball directly in its trajectory. T...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||