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This paper describes the construction and utilization of two novel semantic spaces, namely Ontology-enriched Semantic Space (OSS) and Ontology-enriched Orthogonal Semantic Space (OS 2 ), to facilitate the selection of concept detectors for video search. These two semantic spaces are enriched with ontology knowledge, while emphasizing consistent and uniform comparison of ontological relatedness among concepts for query-to-concept mapping. OS 2 , in addition to being a linear space like OSS, alsodoi:10.1109/tmm.2008.2001382 fatcat:64zeljttpjeifobhzuswfxp6ue