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Title: The relationship between media quality and user cost in networked multimedia applications
Author: Wilson, Gillian May
Awarding Body: UCL (University College London)
Current Institution: University College London (University of London)
Date of Award: 2006
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The research reported in this thesis assesses the impact of media quality degradations in Internet multimedia conferencing on users. Low quality audio and video can be experienced, therefore it is important to determine the minimum levels of quality needed to perform specific tasks. This has most commonly been investigated using subjective measures, however the research reported in this thesis adopted a 3-factor evaluation framework of task performance, user satisfaction and user cost. User satisfaction was measured subjectively, whereas physiological indicators of perceptual strain were utilised to measure user cost. Physiological measures provide continuous data throughout a session, are not subject to cognitive mediation and taking such measurements does not interfere with the user's task. Five experiments were performed investigating audio and video quality degradations. With the exception of one passive listening task, all tasks used were based on remote interviews, as they fully exploit the capabilities of the application. Results showed that physiological responses to media quality degradations can be detected in passive, perceptual tasks. However, active participation in a task made it more difficult to detect changes due to quality degradations. In all experiments physiological measures gave information on the nature of the tasks being performed and effects of variables such as order. The results of this research were then used in three further experiments in the areas of VR and web quality of service and design. In conclusion, the physiological measures utilised in the research reported in this thesis can be employed to assess the impact of media quality degradations in passive perceptual tasks and to give general information about the nature of the task being performed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available