2011
Authors
Ciobanu, L; Corte Real, L;
Publication
MULTIMEDIA TOOLS AND APPLICATIONS
Abstract
Multi-view registration is an essential step in order to generate the side information for multi-view Distributed Video Coding. As stated in our previous work (Ciobanu and Crte-Real, Multimed Tools Appl 48(3):411-436, 2010) it can be achieved by SIFT (scale-invariant feature transform) generated keypoint matches. The registration accuracy is vital for the adequate generation of side information and it directly depends on the reliable match of possibly all the available point to point correlations between two complete-overlapped views. We propose a solution to this problem based on iterative filtering of SIFT-generated keypoint matches, using the Hough transform and block matching. It aims the generic, real-life and constraint-free scenarios having an arbitrarily close angle between the two views. Practical results show an overall significant reduction of the outliers while maintaining a high rate of correct matches.
2011
Authors
Goncalves, H; Teodoro, AC; Goncalves, JA; Real, LC;
Publication
EARTH RESOURCES AND ENVIRONMENTAL REMOTE SENSING/GIS APPLICATIONS II
Abstract
The geometric correction of images under the scope of remote sensing applications is still mostly a manual work. This is a time and effort consuming task associated with an intra-and inter-operator subjectivity. One of the main reasons may be the lack of a proper evaluation of the different available automatic image registration ( AIR) methods, since some of them are only adequate for certain types of applications/data. In order to fulfill a gap in this context, a first reference dataset of pairs of images comprising some types of geometric distortions was created, different spatial and spectral resolutions, and divided according to the Level 1 of CORINE Land Cover nomenclature ( European Environment Agency). This dataset will allow for gaining perception of the abilities and limitations of some AIR methods. Some AIR methods were evaluated in this work, including the traditional correlation-based method and the SIFT approach, for which a set of measures for an objective evaluation of the geometric correction process quality was computed for every combination of pair of images/AIR method. The reference dataset is available from an internet address, being expected that it becomes a channel of interaction among the remote sensing community interested in this field.
2011
Authors
Teixeira, A; Rocha, N; Dias, MS; Braga, D; Queiros, A; Pacheco, O; Fonseca, JA; Pinto, JS; Gamboa, H; Corte Real, L; Fonseca, J; Martins, JA; Neves, A; Bartolomeu, P; Oliveira, C; Cunha, J; Pereira, C;
Publication
Proceedings of the 1st International Living Usability Lab Workshop on AAL Latest Solutions, Trends and Applications, AAL 2011, in Conjunction with BIOSTEC 2011
Abstract
Living Usability Lab for Next Generation Networks (www.livinglab.pt) is a Portuguese industry-academia collaborative R&D project, active in the field of live usability testing, focusing on the development of technologies and services to support healthy, productive and active citizens. The project adopts the principles of universal design and natural user interfaces (speech, gesture) making use of the benefits of next generation networks and distributed computing. Therefore, it will have impact on the general population, including the elderly and citizens with permanent or situational special needs. This paper presents project motivations, conceptual model, architecture and work in progress.
2011
Authors
Proudley, GM; Brownjohn, N; Baptista, J; Bacou, A; Salgado, HM; Clausen, A; Deimel, P; Farries, M; Gauchy, S; Kopacek, I; Lee, A; Napier, B; Traversone, M; Vincent, J; Zimmermann, A;
Publication
2011 IEEE Avionics, Fiber- Optics and Photonics Technology Conference, AVFOP 2011
Abstract
DAPHNE (Developing Aircraft PHotonic NEtworks) is a 3-year European FP7 project (started September 2009). The aim of DAPHNE is to exploit terrestrial optical networking technology (with associated performance advantages) in future aircraft and systems. The consortium comprises fifteen partners (from seven nations) ranging from major air framers (both fixed and rotary wing) through component and equipment manufacturers and leading European universities. The project is coordinated by Airbus. © 2011 IEEE.
2011
Authors
Oliveira, JMB; Pessoa, LM; Salgado, HM; Darwazeh, I;
Publication
2010 12TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON)
Abstract
We discuss recent developments in signal processing techniques for post-compensation of fiber dispersion and nonlinear distortion in both coherent and radio-over-fiber optical systems.
2011
Authors
Luo, Q; Pereira, JR; Salgado, HM;
Publication
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Abstract
One compact printed monopole antenna with a chip inductor for dual-band WLAN is presented. The proposed antenna has a two-armed structure and an electrically small size. The equivalent circuit structure of the chip inductor is studied and a simplified circuit structure is proposed. This simplified circuit structure was introduced into the electromagnetic (EM) simulation model by assigning a boundary condition, and the experimental results show that with this model, the simulation can provide an accurate prediction of the antenna radiation performance. The measurement results show that the proposed monopole antenna has a VSWR 2: 1 bandwidth over 2.41-2.49 and 5.2-5.6 GHz with omnidirectional radiation patterns. The simulation results suggest that the proposed antenna has a directivity around 1.5 dB at both bands with relatively high radiation efficiency. The antenna is designed and optimized by using Ansoft HFSS.
The access to the final selection minute is only available to applicants.
Please check the confirmation e-mail of your application to obtain the access code.