This paper reports two studies that measured the effects of different "video skim" techniques on comprehension, navigation, and user satisfaction.Video skims are compact, content-rich abstractions of longer videos, condensations that preserve frame rate while greatly reducing viewing time. Their characteristics depend on the image-and audio-processing techniques used to create them. Results from the initial study helped refine video skims, which were then reassessed in the second experiment. Significant benefits were found for skims built from audio sequences meeting certain criteria.
Quick access to short, relevant video segments enables efficient use of a digital video library. This study evaluated an interface designed for such access, an interface that allows the user to browse a set of segments generated by a search query. Subjects' performance and attitudes were measured while they performed a fact-finding task to determine the relative effectiveness of three presentations: a text list, naively chosen visual imagery, and querybased visual imagery. Results show little difference in performance and subjective satisfaction between text lists and naively chosen imagery, but significant improvements when the images that represent video segments are based on the query that returned the segments (query-based poster frames). This result applies to the organization and representation of information in digital video libraries.
Multimedia abstractions form essential components of digital video libraries because they enable a user to determine a video's distinguishing content without investing long viewing times or requiring high networktransfer speeds. This paper presents usage and evaluation data for abstractions implemented the Informedia Digital Video Library, and discusses implications for video delivery over the Web. Keywords
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