7. A method for generating concept structures from signature reduced clusters (SRCs), comprising: retrieving at least one current SRC comprising a cluster of signatures respective of a plurality of multimedia data elements (MMDEs); generating a plurality of metadata for each signature of the cluster of signatures; identifying a number of repetitions of each metadata, within the at least one current retrieved SRC, of the plurality of metadata; determining whether the number of repetitions of each metadata of the plurality of metadata exceeds a predefined repetition threshold; upon determining that the number of repetitions of a metadata of the plurality of metadata exceeds the predefined repetition threshold, identifying the metadata as representative of the SRC; determining an overlap level between all identified representative metadata of the current retrieved SRC and all metadata that is representative of at least one previously generated SRC; determining whether the overlap level exceeds a predetermined overlap threshold; and upon determining that the overlap level exceeds a predetermined overlap threshold, identifying the retrieved SRC and the previously generated SRC as a concept structure, wherein the concept structure is represented by the representative matching metadata from both the current retrieved SRC and the at least one previously generated SRC.
7. A method for generating concept structures from signature reduced clusters (SRCs), comprising: retrieving at least one current SRC comprising a cluster of signatures respective of a plurality of multimedia data elements (MMDEs); generating a plurality of metadata for each signature of the cluster of signatures; identifying a number of repetitions of each metadata, within the at least one current retrieved SRC, of the plurality of metadata; determining whether the number of repetitions of each metadata of the plurality of metadata exceeds a predefined repetition threshold; upon determining that the number of repetitions of a metadata of the plurality of metadata exceeds the predefined repetition threshold, identifying the metadata as representative of the SRC; determining an overlap level between all identified representative metadata of the current retrieved SRC and all metadata that is representative of at least one previously generated SRC; determining whether the overlap level exceeds a predetermined overlap threshold; and upon determining that the overlap level exceeds a predetermined overlap threshold, identifying the retrieved SRC and the previously generated SRC as a concept structure, wherein the concept structure is represented by the representative matching metadata from both the current retrieved SRC and the at least one previously generated SRC. 10. A non-transitory computer readable medium having stored thereon instructions for causing a processor to perform the method of claim 7 .