Encontrados 41 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'...
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...
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...
Real-Time Object Recognition Based on Cortical Multi-scale Keypoints
Terzic, Kasim; Rodrigues, J. M. F.; du Buf, J. M. H.In recent years, a large number of impressive object categorisation algorithms have surfaced, both computational and biologically motivated. While results on standardised benchmarks are impressive, very few of the best-performing algorithms took run-time performance into account, rendering most of them useless for real-time active vision scenarios such as cognitive robots. In this paper, we combine cortical key...
Cortical 3D face and object recognition using 2D projections
Rodrigues, J. M. F.; Lam, Roberto Célio Lau; du Buf, J. M. H.Empirical studies concerning face recognition suggest that faces may be stored in memory by a few canonical representations. In cortical area V1 exist double-opponent colour blobs, also simple, complex and end-stopped cells which provide input for a multiscale line/edge representation, keypoints for dynamic feature routine, and saliency maps for Focus-of-Attention.
Indoor localization and navigation for blind persons using visual landmarks and...
Serrão, M.; Rodrigues, J. M. F.; Rodrigues, J. I.; du Buf, J. M. H.In an unfamiliar environment we spot and explore all available information which might guide us to a desired location. This largely unconscious processing is done by our trained sensory a nd cognitive systems. These recognize and memorize sets of landmarks which allow us to create a mental map of the envi ronment, and this map enables us to navigate by exploiting very few but the most important landmarks stored...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||