Quality evaluation of long duration audiovisual content

In this paper a new methodology for the evaluation of perceived quality for long duration audiovisual content is presented. This method allows the investigation of unexplored dependencies between perceived quality and impairment variations over extended periods of time. Instead of providing quality scores on predefined rating scales, assessors are asked to adjust the quality level of the displayed content themselves, whenever a degradation in perceived quality occurs. This method approaches the problem of quality evaluation from a different perspective than the existing methods, which might be valuable for future research and application. Preliminary results of an experiment conducted using this methodology are presented.