Abstract
AbstractDigitally coded television pictures exhibit transient picture impairments that can vary in intensity and duration. It is an important practical question to determine the extent to which these transient impairments affect the overall quality of a television sequence, as a function of their location within the sequence, their duration and their magnitude. Five experiments are reported. It is shown that retrospective quality ratings are poorer when the worst‐quality video occurs at the end compared to the beginning of a 30 s video sequence. This recency effect was eliminated when subjects were asked to continuously evaluate picture quality. The duration of an impairment was found to have little impact on quality ratings. A regression analysis found that quality ratings were best predicted by the peak impairment intensity. The results were interpreted in terms of Hogarth and Einhorn's (1992) belief‐adjustment model. The implications for television picture quality evaluation are discussed. Copyright © 2001 John Wiley & Sons, Ltd.
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