CTM - Theses / Dissertations

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    Metadata Assisted Image Segmentation
    ( 2006) Jaime Cardoso
    For over a century the process of capturing electronic images has remained virtually unchanged, with each pixel in the image being a discrete sample of the spatial and temporal continuum being photographed. In a conventional camera, the only recorded information for each pixel is position and colour. The fact is that captured images remain very limited samples of the scene they represent, only giving a 2D impression of the 3D spatial buildup of the scene. This primitive process of capture is the cause of problems in a myriad of applications, ranging from the film and television post-production to virtual reality, or object-based video formats and industrial inspection. Although much effort has been put into surmounting these problems, all these approaches are based on the estimation of data that is simply not included in the discrete samples provided by digital images, and so are limited in the quality they can provide. The capture of additional data is a step forward to add
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    Edition and Description Framework for Video Objects
    ( 2004) Luís Filipe Teixeira
    The way humankind has recorded its knowledge has changed dramatically. Today, incredibly small devices can store hundreds of books or pictures, hours of speech, music or video. Digital information has reached all types of expression and, above all, it acquired important properties: portability, mobility and ubiquity. Despite this promising scenario, some obstacles have made its concretization a difficult task. The myriad of formats and technologies used to encode information not always allows a real convergence. To face this problem, the MPEG specified a technology that allows the composition and delivery of interactive multimedia content at variable bit rates over high and low bandwidth connections -- the MPEG-4 standard. In other words, a technology that aggregates all types of information in a rich-content format which can be delivered everywhere. Audiovisual content is created at an increasingly fast pace. These sources of information also have an increasing need for processi