2 research outputs found

    Monitoring System for Compression Sleeves

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    Linfedema está correlacionado com o tratamento do cancro. Durante o tratamento, os nós linfáticos podem ser removidos ou radiados, isso pode causar a paragem no normal fluxo da linfa, resultando no inchaço de linfa. Quanto mais cedo a deteção ocorre mais fácil é tratar o linfedema, e para avalia-la é medido o perímetro dos braços afetados e não afetados em 3 zonas. A manga compressiva é usada no tratamento do linfedema, cosendo à manga um modelo feito por fio condutor é possível medir a impedância. Posto isto a impedância é correlacionada com a força aplicada na manga, monitorizando deste modo o aumento/diminuição do linfedema.Lymphedema is correlated with cancer treatment. During the treatment, lymphatic nodes can be removed or radiated, that can stop the normal flow of lymph resulting in the build up of lymph. As soon detection occurs more easy is to treat Lymphedema and to assess it is measure the perimeter of affected and unaffected arm in three zones. The compression sleeve is used in the lymphedema treatment, sewing to it a model made by conductive thread is possible measure impedance. Therefore the impedance is correlated with force aplied in sleeve, monitoring this way the increase/decrease of lymphedema

    Quality of Experience in Immersive Video Technologies

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    Over the last decades, several technological revolutions have impacted the television industry, such as the shifts from black & white to color and from standard to high-definition. Nevertheless, further considerable improvements can still be achieved to provide a better multimedia experience, for example with ultra-high-definition, high dynamic range & wide color gamut, or 3D. These so-called immersive technologies aim at providing better, more realistic, and emotionally stronger experiences. To measure quality of experience (QoE), subjective evaluation is the ultimate means since it relies on a pool of human subjects. However, reliable and meaningful results can only be obtained if experiments are properly designed and conducted following a strict methodology. In this thesis, we build a rigorous framework for subjective evaluation of new types of image and video content. We propose different procedures and analysis tools for measuring QoE in immersive technologies. As immersive technologies capture more information than conventional technologies, they have the ability to provide more details, enhanced depth perception, as well as better color, contrast, and brightness. To measure the impact of immersive technologies on the viewersâ QoE, we apply the proposed framework for designing experiments and analyzing collected subjectsâ ratings. We also analyze eye movements to study human visual attention during immersive content playback. Since immersive content carries more information than conventional content, efficient compression algorithms are needed for storage and transmission using existing infrastructures. To determine the required bandwidth for high-quality transmission of immersive content, we use the proposed framework to conduct meticulous evaluations of recent image and video codecs in the context of immersive technologies. Subjective evaluation is time consuming, expensive, and is not always feasible. Consequently, researchers have developed objective metrics to automatically predict quality. To measure the performance of objective metrics in assessing immersive content quality, we perform several in-depth benchmarks of state-of-the-art and commonly used objective metrics. For this aim, we use ground truth quality scores, which are collected under our subjective evaluation framework. To improve QoE, we propose different systems for stereoscopic and autostereoscopic 3D displays in particular. The proposed systems can help reducing the artifacts generated at the visualization stage, which impact picture quality, depth quality, and visual comfort. To demonstrate the effectiveness of these systems, we use the proposed framework to measure viewersâ preference between these systems and standard 2D & 3D modes. In summary, this thesis tackles the problems of measuring, predicting, and improving QoE in immersive technologies. To address these problems, we build a rigorous framework and we apply it through several in-depth investigations. We put essential concepts of multimedia QoE under this framework. These concepts not only are of fundamental nature, but also have shown their impact in very practical applications. In particular, the JPEG, MPEG, and VCEG standardization bodies have adopted these concepts to select technologies that were proposed for standardization and to validate the resulting standards in terms of compression efficiency
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