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W137371367 abstract "People like to consume multimedia content on mobile devices. Mobile networks can deliver mobile TVservices but they require large infrastructural investments and their operators need to make trade-offs todesign worthwhile experiences. The approximation of how users experience networked services hasshifted from the inadequate packet level Quality of Service (QoS) to the user perceived Quality ofExperience (QoE) that includes content, user context and their expectations. However, QoE is lackingconcrete operationalizations for the visual experience of content on small, sub-TV resolution screensdisplaying transcoded TV content at low bitrates.The contribution of my thesis includes both substantive and methodological results on which factorscontribute to the QoE in mobile multimedia services and how. I utilised a mix of methods in both lab andfield settings to assess the visual experience of multimedia content on mobile devices. This includedqualitative elicitation techniques such as 14 focus groups and 75 hours of debrief interviews in sixexperimental studies. 343 participants watched 140 hours of realistic TV content and provided feedbackthrough quantitative measures such as acceptability, preferences and eye-tracking.My substantive findings on the effects of size, resolution, text quality and shot types can improvemultimedia models. My substantive findings show that people want to watch mobile TV at a relative size(at least 4cm of screen height) similar to living room TV setups. In order to achieve these sizes at 35cmviewing distance users require at least QCIF resolution and are willing to scale it to a much lower angularresolution (12ppd) then what video quality research has found to be the best visual quality (35ppd). Mymethodological findings suggest that future multimedia QoE research should use a mixed methodsapproach including qualitative feedback and viewing ratios akin to living room setups to meet QoE’sambitious scope." @default.
W137371367 created "2016-06-24" @default.
W137371367 creator A5078443928 @default.
W137371367 date "2011-07-28" @default.
W137371367 modified "2023-09-24" @default.
W137371367 title "Quality of experience in digital mobile multimedia services" @default.
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