Due to the unique characteristics of video, traditional
surrogates and control/browsing mechanisms that facilitate text-based
information retrieval may not work sufficiently for video. In this paper,
a
video browsing interface prototype with key frames and fast play-back
mechanisms was built and tested. Subjects performed two kinds of
browsing-related tasks: object identification and video comprehension
under
different display speeds (1 fps, 4 fps, 8 fps, 12 fps and 16 fps). It was
found that browsing the key frames between 8 to 12 fps could potentially
define a functional limit in object identificationaccuracy. There was no
significant performance difference found across display speeds tested. The
results also showed that lower speeds were required for object
identification than for video comprehension. How user performance was
affected by individual characteristics such as age, gender, academic
background and TV- or movie-watching habits, was investigated, but no
significant difference was found due to the limit of sample size and other
constraints.
(Also cross-referenced as UMIACS-TR-97-40)
(Also cross-referenced as CLIS-TR-97-06