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Multimedia search enables information search using queries in multiple data types including text and other multimedia formats. Multimedia search can be implemented through multimodal search interfaces, i.e., interfaces that allow to submit search queries not only as textual requests, but also through other media. We can distinguish two methodologies in multimedia search: *Metadata search: the search is made on the layers of metadata. * Query by example: The interaction consists in submitting a piece of information (e.g., a video, an image, or a piece of audio) at the purpose of finding similar multimedia items. ==Metadata search== Search is made using the layers in metadata which contain information of the content of a multimedia file. Metadata search is easier, faster and effective because instead of working with complex material, such as an audio, a video or an image, it searches using text. There are three processes which should be done in this method: *Summarization of media content (feature extraction). The result of feature extraction is a description. *Filtering of media descriptions (for example, elimination of Redundancy) * Categorization of media descriptions into classes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「multimedia search」の詳細全文を読む スポンサード リンク
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