Wehavewitnessedgreatinterestandawealthofpromiseincontent-basedimageretrievalasanemergingtechnology.Whilethelastdecadelaidfoundationtosuchpromise,italsopavedthewayforalargenumberofnewtechniquesandsystems,gotmanynewpeopleinvolved,andtriggeredstrongerassociationofweaklyrelatedfields.