AXMEDIS 2008

The AXMEDIS International Conference series aims to explore all subjects and topics related to cross-media and digital-media content production, processing, management, standards, representation, sharing, protection and rights management, to address the latest developments and future trends of the technologies and their applications, impacts and exploitation. The AXMEDIS events offer venues for exchanging concepts, requirements, prototypes, research ideas, and findings which could contribute to academic research and also benefit business and industrial communities. In the Internet as well as in the digital era, cross-media production and distribution represent key developments and innovations that are fostered by emergent technologies to ensure better value for money while optimising productivity and market coverage

Interactive Digital Terrestrial Television: The Interoperability Challenge in Brazil

This paper introduces different standards implemented in existing Digital Terrestrial Television Broadcasting systems to allow the fruition of interactive services and applications through digital Set Top Boxes. It focuses on the interoperability issue between the Brazilian and the European architectures. In fact, despite in Brazil the GEM specification has been designed to foster wide content compatibility across a range of interactive platforms, it has never come to a final implementation and deployment. As a result the interoperability issue has been deeply explored in the BEACON project and an innovative system architecture has been developed to deploy t-learning services across Europe and Brazil, providing integration of those systems that were not able to interoperate until nowadays. This work is an important step in the direction of standards' interoperability. As a result, MHP and Ginga NCL-Lua implementation appeared to be the very best choice to deliver interactive services in an interoperable mode between European and Brazilian digital television

A graphics software architecture for high-end interactive TV terminals

This thesis proposes a graphics architecture for next-generation digital television receivers. The starting assumption is that in the future, a number of multimedia terminals will have access through a number of networks to a variety of content and services. One example of such a device is a media station capable of integrating different kinds of multimedia objects such as 2D/3D graphics and video, reacting to user interaction, and supporting the temporal dimension of applications. Some of the services intended for these devices include, for example, games and enhanced information over broadcasted video. First, this thesis provides an overview of the digital television environment, focusing on the limitations of current receivers and hints at future directions. In addition, this thesis compares different solutions from regional standardisation bodies such as DVB, CableLabs, and ARIB. It proposes the adoption of the most relevant initiative, GEM by DVB. Unfortunately, GEM software middleware only considers Java language as an authoring format, meaning that the declarative environment and advanced functionalities (e.g., 3D graphics support) remain to be standardised. Because in the future different user groups will have different demands with regard to television, this thesis identifies two major extensions to the GEM standard. First, it proposes a declarative environment for GEM that takes into account W3C standardisation efforts. This environment is divided into two configurations: one capable of rendering limited interactive applications such as information services, and another intended for more demanding applications, for example a distance learning portal that synchronises videos of lecturers and slides. Second, this thesis proposes to extend the procedural environment of GEM with 3D graphics support. The potential services of this new profile, High-End Interactive, include games and commercials. Then, based on the requirements the proposed profiles should meet, this thesis defines a graphics architecture model composed of five layers. The hardware abstraction layer is in charge of rendering the final graphics output. The graphical context is a cross-platform abstraction of the rendering region and provides graphics primitives (e.g., rectangles and images). The graphical environment provides the means to control different graphical contexts. The GUI toolkit is a set of ready-made user interface widgets and layout schemes. Finally, high-level languages are easy-to-use tools for developing simple services. The thesis concludes with a report of my experience implementing a digital television receiver based on the proposals described. In addition to testing the application of the proposed graphics architecture to the design and implementation of a next-generation digital television receiver, the implementation permits the analysis of the requirements of such receivers and of the services they can provide.reviewe

Access to public broadcasting services across national digital delivery systems

Traditionally broadcasting and telecommunications have been regarded as completely separate sectors Broadcasting as a transmission system was inseparable from the broadcast content Alternatively, telecommunication networks were the sole providers of voice and basic data telephony services But as technology developed and both markets began to offer similar services, the regulatory dividing lines between Internet, broadcasting and telecommunications services have begun to blur Broadcasting as a transmission system is becoming detached from the broadcast content Even though these markets are technically converging the issue of access to content and the licensing of content providers over these new delivery platforms to carry their services remain unresolved The liberalisation of both markets may make a significant difference to the production o f content and the access of such programming content to pay-television and Free-to-Air viewers. The transmission of similar services over previously distinct delivery systems has been categonsed as convergence This term is generally considered as a suitable representation of the hazy combination of different broadcast and point-to-point services that were once considered the domain of the telecommunications incumbent Equally, the broadcast network was considered an indispensable part of the public broadcasting organisation in its provision of a single content service such as television programming Today, digital technology and the liberalisation of the cable and telecommunications networks have allowed multiple content service providers to offer many different services over several networks. Such technological convergence is delivering different services within each network In the past, the analogue broadcast relationship involved the content provider, network operator and customer Now, there are additional market players between the customer and the network operator called service providers who control different parts of the downstream and upstream dynamics This paper hopes to highlight the potential impact of telecommunication liberalisation on broadcasting as network operators begin to provide video and broadcast services while broadcast network operators transmit unicast and point-to-point services alongside their traditional broadcast service

Public intervention in private rule-making: the role of the European Commission in industry standardization

The thesis investigates the role of public actors in private rule-making processes at the example of the European Commission’s interventions in private industry standardization in the mobile telecoms, high-definition television, digital broadcasting and intermodal transport industries. It demonstrates that, far from having replaced public rule-making or representing a form of ‘better’ regulation, the private development of technical standards is constrained by the same collective action and decision-making problems that constrain conventional policy-making processes. Without the facilitating interventions of public actors, private standard setters often struggle to overcome these constraints. The ability of public actors to facilitate the private development of technical standards, however, depends on a number of conditions. First they need to rely on entrepreneurial rather than conventional policy instruments based on hierarchical authority and the power of hard law. Hierarchical interventions—in addition to the well-known information problems—only tend to have the unintended effect of exposing technical standardization processes to political contestation, exacerbating the inherent decision-making problems. Entrepreneurial interventions, by contrast, may facilitate the private development of technical standards without exposing the standardization process to political contestation. While such interventions may raise serious legitimacy concerns, they also depend on a number of conditions, such as early intervention, the presence of industry crisis, and the availability of positive feedback mechanisms that drive compliance with the developed standards. With its focus on technical standardization, this thesis seeks to contribute to wider debates on self– and co–regulation and the transforming role of government in the governance of advanced market economies more broadly

Evolução e tendências das pesquisas sobre t-learning: um mapeamento das publicações disponíveis na base de dados SCOPUS de 2000 a 2011

Estudos sobre aplicações e serviços para TV Digital Interativa com foco na educação a distância, denominados de t-learning são relativamente recentes, pois o corpo de conhecimentos na área é encontrado de forma dispersa e fragmentada. Obter uma base sólida de conhecimentos sobre t-learning apresenta-se como um desafio e uma oportunidade de pesquisa. O objetivo deste artigo é mapear o perfil das pesquisas acadêmico-científicas em t-learning. Para tanto, foram utilizados procedimentos e técnicas bibliométricas, a partir da base de dados SCOPUS, de forma a localizar estudos sobre o tema no período de 2000 a 2011. Os resultados apresentam uma caracterização das instituições, dos pesquisadores e das áreas do conhecimento que estão estudando o tema, sendo significativa a presença de pesquisadores das áreas tecnológicas, assim como uma análise geral do campo de estudos com base nos 65 artigos mapeados na pesquisa