14 documents found, page 1 of 2
A Flexible assessment platform for middle school, supported on students goals
Cardoso, Pedro; Lam, Roberto; Pereira, Rui Penha; Rodrigues, Nuno; Herdeiro, CláudiaRooted in many education system, assessment by written exams in a live only time evaluation is a traditional way to judge the student learnings. This live only time evaluation method leads to dys- functionalities such as high levels of stress and the assumption, by the students and by some teachers, that exams re ect the educational goals. This paper presents the Assessment Centers in Schools (ACiSs) project wh...
Correspondence of three-dimensional objects
Lam, RobertoFirst many thanks go to Prof. Hans du Buf, for his supervision based on his experience, for providing a stimulating and cheerful research environment in his laboratory, for letting me participate in the projects that produced results for papers, thus made me more aware of the state of the art in Computer Vision, especially in the area of 3D recognition. Also for his encouraging support and his way to always nd ...
Framework for a Hospitality Big Data Warehouse: The Implementation of an Effici...
Ramos, Celia; Martins, Daniel; Serra, Francisco; Lam, Roberto; Cardoso, Pedro; Correia, Marisol; Rodrigues, Joãoorder to increase the hotel's competitiveness, to maximize its revenue, to meliorate its online reputation and improve customer relationship, the information about the hotel's business has to be managed by adequate information systems (IS). Those IS should be capable of returning knowledge from a necessarily large quantity of information, anticipating and influencing the consumer's behaviour. One way to manage ...
GyGSLA: A portable glove system for learning sign language alphabet
Sousa, Luis; Rodrigues, João; Monteiro, Jânio; Cardoso, Pedro J. S.; Lam, RobertoThe communication between people with normal hearing with those having hearing or speech impairment is difficult. Learning a new alphabet is not always easy, especially when it is a sign language alphabet, which requires both hand skills and practice. This paper presents the GyGSLA system, standing as a completely portable setup created to help inexperienced people in the process of learning a new sign language...
Cortical 3D face and object recognition using 2D projections
Rodrigues, J. M. F.; Lam, Roberto; 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.
Cortical multiscale line-edge disparity model
Rodrigues, J. M. F.; Martins, Jaime; Lam, Roberto; du Buf, J. M. H.Most biological approaches to disparity extraction rely on the disparity energy model (DEM). In this paper we present an alternative approach which can complement the DEM model. This approach is based on the multiscale coding of lines and edges, because surface structures are composed of lines and edges and contours of objects often cause edges against their background. We show that the line/edge approach can b...
A disparity energy model improved by line, edge and keypoint correspondences
Martins, J. C.; Farrajota, Miguel; Lam, Roberto; Rodrigues, J. M. F.; Terzic, Kasim; du Buf, J. M. H.Disparity energy models (DEMs) estimate local depth information on the basis ofVl complex cells. Our recent DEM (Martins et al, 2011 ISSPlT261-266) employs a population code. Once the population's cells have been trained with randorn-dot stereograms, it is applied at all retinotopic positions in the visual field. Despite producing good results in textured regions, the model needs to be made more precise, especi...
Retrieval of 3D polygonal objects based on multiresolution signatures
Lam, Roberto; du Buf, J. M. H.In this paper we present a method for retrieving 3D polygonal objects by using two sets of multiresolution signatures. Both sets are based on the progressive elimination of object's details by iterative processing of the 3D meshes. The first set, with five parameters, is based on mesh smoothing. This mainly affects an object's surface. The second set, with three parameters, is based on difference volumes after ...
Cortical 3D Face Recognition Framework
Rodrigues, J. M. F.; Lam, Roberto; 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 routing and saliency maps for Focus-of-Attention. All these combined allow us to segregate faces. Events ...
Invariant Categorisation of Polygonal Objects using Multi-resolution Signatures
Lam, Roberto; du Buf, J. M. H.With the increasing use of 3D objects and models, mining of 3D databases is becoming an important issue. However, 3D object recognition is very time consuming because of variations due to position, rotation, size and mesh resolution. A fast categorisation can be used to discard non-similar objects, such that only few objects need to be compared in full detail. We present a simple method for characterising 3D ob...