Abstract. SAPIRisapeer-to-peermultimediainformationretrieval systemthatcanindexstructuredandunstructuredtext,stillandmoving images,speech,andmusic.Thesystem’sfeatureextraction component, whichanalyzesdocumentstopreparethemforindexing,isimplemented usingUIMA.Ithandlescompounddocumentsusinganarchitectureof (potentiallynested)splittersandmergerswithinaUIMAaggregate.For example,themovingimagefromavideoissplitintoanumberofrepre- sentativevideoframes,eachofwhichisprocessedbythesameanalysis engineusedforstillimages,andthenmergingtheresultsto formaunifi ed representationofthevideo.Theoutputofthefeatureextractionmod- uleisadocumentdescriptioninarepresentationbasedontheMPEG-7 standard.

Feature_extraction_Multimedia.pdf

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