Improving Access to a Digital Video Library

Abstract

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.

Evolving video skims into useful multimedia abstractions

“…Showing where query-matching words occur within a video's transcript also may aid navigation to a point within a video more directly than a skim [3]. Rather than attempt to justify the use of skims for navigation, we decided to address only the issue of gisting in our subsequent skim study.…”

“…Work on other multimedia abstractions has shown the benefits of exploiting context to tailor representations [3]. For example, given a query, a skim emphasizing target regions that contain matches may prove more effective than a general-purpose skim.…”

“…Examples include brief titles and individual "thumbnail" images that, when selected appropriately, facilitate operations on the corresponding source [3]. Another common approach presents an ordered set of representative thumbnail images simultaneously on a computer screen [3,5,6,9,11,15,17,18].…”

Design, implementation and testing of an interactive video retrieval system

“…This example is repeated in other topics also. We consider that the overview of the video should show a more query-based overview [16] rather than the general overview as at present, that is, we should select thirty keyframes based on the scores of the shots, rather than simply by time length as currently.…”

Measuring user performance during interactions with digital video collections

“…Within the context of digital video collections, varied types of video surrogates have been created and their use studied. They include poster frames, filmstrips and skims (Christel, Winkler & Taylor, 1997); storyboards and slide shows (e.g., Tse et al, 1998;Wildemuth et al, 2002); fast forwards (Wildemuth et al, 2003); and automaticallygenerated summaries (He et al, 1999).…”