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About

About

I obtained my B.Sc. in Electrical and Computer Engineering from Faculdade de Engenharia da Universidade do Porto (FEUP) in 2003. In 2013 I obtained a PhD degree in Electrical and Computers Engineering also from FEUP. Concurrently, I have been doing research work at INESC TEC, since 2003, and am presently developing research work at that institution, under an FCT post-Doc grant.

My main research interests are: distributed information systems, future Internet, multimedia metadata and metadata for assisting synthetic cognition.

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Publications

2016

Cognition inspired format for the expression of computer vision metadata

Authors
Castro, H; Monteiro, J; Pereira, A; Silva, D; Coelho, G; Carvalho, P;

Publication
MULTIMEDIA TOOLS AND APPLICATIONS

Abstract
Over the last decade noticeable progress has occurred in automated computer interpretation of visual information. Computers running artificial intelligence algorithms are growingly capable of extracting perceptual and semantic information from images, and registering it as metadata. There is also a growing body of manually produced image annotation data. All of this data is of great importance for scientific purposes as well as for commercial applications. Optimizing the usefulness of this, manually or automatically produced, information implies its precise and adequate expression at its different logical levels, making it easily accessible, manipulable and shareable. It also implies the development of associated manipulating tools. However, the expression and manipulation of computer vision results has received less attention than the actual extraction of such results. Hence, it has experienced a smaller advance. Existing metadata tools are poorly structured, in logical terms, as they intermix the declaration of visual detections with that of the observed entities, events and comprising context. This poor structuring renders such tools rigid, limited and cumbersome to use. Moreover, they are unprepared to deal with more advanced situations, such as the coherent expression of the information extracted from, or annotated onto, multi-view video resources. The work here presented comprises the specification of an advanced XML based syntax for the expression and processing of Computer Vision relevant metadata. This proposal takes inspiration from the natural cognition process for the adequate expression of the information, with a particular focus on scenarios of varying numbers of sensory devices, notably, multi-view video.

2015

Semantically connected web resources with MPEG-21

Authors
Castro, H; Andrade, MT; Almeida, F; Tropea, G; Melazzi, NB; Mousas, AS; Kaklamani, DI; Chiariglione, L; Difino, A;

Publication
MULTIMEDIA TOOLS AND APPLICATIONS

Abstract
The Web is rapidly becoming the prime medium for human socialization. The resources that enable that process (social web sites, blogs, media objects, etc.) present growing complexity and, collectively, weave an ever more intricate web of relationships. Current technology for declaring those relationships is predominantly implicit, ambiguous and semantically poor. As a consequence, their automatic assessment is complex and error prone, preventing the satisfaction of users' needs such as effective semantic searches. To address these limitations, whilst enabling the explicit declaration of semantically unambiguous relationships between digital resources, a solution employing structured semantic descriptors and ontologies was conceived, based on MPEG-21. This paper explains the functioning of the devised mechanism, and goes beyond that, into the definition of two novel employment venues for it, at the service of two real-world usage scenarios. These demonstrate the mechanism's added value as a powerful alternative for the semantically aware interconnection of web resources, and highlight the increased QoE that said mechanism enables.

2010

A New Paradigm for Content Producers

Authors
Hélder Fernandes Castro; Artur Pimenta Alves; Carlos Serrão; Brett Caraway

Publication
IEEE MM - IEEE Multimedia, vol.17, no.2, pp.90-93

Abstract
The production, distribution, and consumption of information goods have endured numerous challenges over the years. Most recently, the Internet and digital consumer technologies have severely disrupted established intellectual-property regimes, enabling the near costless reproduction and distribution of information commodities. In addition, sophisticated tools have enabled new collaborative spaces (such as blogs, social websites, and so forth) for media production and distribution, posing new challenges to traditional creator-producer-consumer paradigms. This article analyzes the present situation's main technological characteristics, its economic implications, and the industry's response-and outlines a possible solution to the problems.

2005

Monitoring Emerging IPv6 Wireless Access Networks

Authors
Pedro Marques; Hélder Castro; Manuel Pereira Ricardo

Publication
IEEE WCM - IEEE Wireless Communications Magazine, vol.12, no.1, pp.47-53

Abstract