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This paper presents an approach for efficient keyframe extraction, using local semantics in form of a region thesaurus. More specifically, certain MPEG-7 color and texture features are locally extracted from keyframe regions. Then, using a hierarchical clustering approach a local region thesaurus is constructed to facilitate the description of each frame in terms of higher semantic features. The feature is consisted by the most common region types that are encountered within the video shot,doi:10.1109/smap.2007.39 dblp:conf/smap/SpyrouA07 fatcat:nnnnz2ersvevzb22cpyunvowhm