Augmenting conversations through context-aware multimedia retrieval based on speech recognition

Future’s environments will be sensitive and responsive to the presence of people to support them carrying out their everyday life activities, tasks and rituals, in an easy and natural way. Such interactive spaces will use the information and communication technologies to bring the computation into the physical world, in order to enhance ordinary activities of their users. This paper describes a speech-based spoken multimedia retrieval system that can be used to present relevant video-podcast (vodcast) footage, in response to spontaneous speech and conversations during daily life activities. The proposed system allows users to search the spoken content of multimedia files rather than their associated meta-information and let them navigate to the right portion where queried words are spoken by facilitating within-medium searches of multimedia content through a bag-of-words approach. Finally, we have studied the proposed system on different scenarios by using vodcasts in English from various categories, as the targeted multimedia, and discussed how it would enhance people’s everyday life activities by different scenarios including education, entertainment, marketing, news and workplace

Complete LibTech 2013 Print Program

PDF of the complete print program from the 2013 Library Technology Conferenc

In-Network View Synthesis for Interactive Multiview Video Systems

To enable Interactive multiview video systems with a minimum view-switching delay, multiple camera views are sent to the users, which are used as reference images to synthesize additional virtual views via depth-image-based rendering. In practice, bandwidth constraints may however restrict the number of reference views sent to clients per time unit, which may in turn limit the quality of the synthesized viewpoints. We argue that the reference view selection should ideally be performed close to the users, and we study the problem of in-network reference view synthesis such that the navigation quality is maximized at the clients. We consider a distributed cloud network architecture where data stored in a main cloud is delivered to end users with the help of cloudlets, i.e., resource-rich proxies close to the users. In order to satisfy last-hop bandwidth constraints from the cloudlet to the users, a cloudlet re-samples viewpoints of the 3D scene into a discrete set of views (combination of received camera views and virtual views synthesized) to be used as reference for the synthesis of additional virtual views at the client. This in-network synthesis leads to better viewpoint sampling given a bandwidth constraint compared to simple selection of camera views, but it may however carry a distortion penalty in the cloudlet-synthesized reference views. We therefore cast a new reference view selection problem where the best subset of views is defined as the one minimizing the distortion over a view navigation window defined by the user under some transmission bandwidth constraints. We show that the view selection problem is NP-hard, and propose an effective polynomial time algorithm using dynamic programming to solve the optimization problem. Simulation results finally confirm the performance gain offered by virtual view synthesis in the network

Determinants in the on-line distribution of digital content: an exploratory analysis

This article shows the phases – and discusses the results – of an empirical analysis addressing the legal business models that are adopted online to distribute digital content

International gaming:laws and regulations around games in the digital era: conference proceedings

Games have a complicated relationship with the law and with the globalization of the gaming market in the digital era, legality is something that must be considered in the development, publication, playing and moderation of games. Games have been and continue to be regulated around the globe, and issues arise at different times in a games life cycle: intellectual property (IP), including patent and copyright protection, must be considered from the initial development of the game; International legality, age ratings, and infringement must be considered in the publication of the game; and players must consider the legality of their manner of obtaining the game and whether or not that game is even legal in the country they are playing in. In addition to this, there are legal issues surrounding abuse and harassment in games, leading several developers to implement moderation and other safety regulations internally in order to pass risk assessments from international regulations. In this way, the laws and regulations around games and gaming in the digital era need to be scrutinized.

International gaming:laws and regulations around games in the digital era: conference proceedings

Games have a complicated relationship with the law and with the globalization of the gaming market in the digital era, legality is something that must be considered in the development, publication, playing and moderation of games. Games have been and continue to be regulated around the globe, and issues arise at different times in a games life cycle: intellectual property (IP), including patent and copyright protection, must be considered from the initial development of the game; International legality, age ratings, and infringement must be considered in the publication of the game; and players must consider the legality of their manner of obtaining the game and whether or not that game is even legal in the country they are playing in. In addition to this, there are legal issues surrounding abuse and harassment in games, leading several developers to implement moderation and other safety regulations internally in order to pass risk assessments from international regulations. In this way, the laws and regulations around games and gaming in the digital era need to be scrutinized.

ARTiVIS Arts, real-time video and interactivity for sustainability

Dissertação para obtenção do Grau de Doutor em Media DigitaisPortuguese Foundation for Science and Technology (SFRH/BD/42555/2007