Video shot boundary detection: seven years of TRECVid activity

Shot boundary detection (SBD) is the process of automatically detecting the boundaries between shots in video. It is a problem which has attracted much attention since video became available in digital form as it is an essential pre-processing step to almost all video analysis, indexing, summarisation, search, and other content-based operations. Automatic SBD was one of the tracks of activity within the annual TRECVid benchmarking exercise, each year from 2001 to 2007 inclusive. Over those seven years we have seen 57 different research groups from across the world work to determine the best approaches to SBD while using a common dataset and common scoring metrics. In this paper we present an overview of the TRECVid shot boundary detection task, a high-level overview of the most significant of the approaches taken, and a comparison of performances, focussing on one year (2005) as an example

Monitoring English Sandhi Linking – A Study of Polish Listeners’ L2 Perception

This paper presents a set of word monitoring experiments with Polish learners of English. Listeners heard short recordings of native English speech, and were instructed to respond when they recognized an English target word that had been presented on a computer screen. Owing to phonological considerations, we compared reaction times to two types of vowel-initial words, which had been produced either with glottalization, or had been joined via sandhi linking processes to the preceding word. Results showed that the effects of the glottalization as a boundary cue were less robust than expected. Implications of these findings for models of L2 speech are discussed. It is suggested that the prevalence of glottalization in L1 production makes listeners less sensitive to its effects as a boundary cue in L2