25. The face annotation system as recited in claim 24 , wherein if the identity label subset corresponding to a bottom layer of the pyramid database unit has been accessed and the first access control is still labelled with 0, then the PDAC module defines misclassified query face images as unrecognized.
24. The face annotation system as recited in claim 14 , wherein the PDAC module accesses and forwards a match set of all face images belonging to the identity label subset corresponding to a temporal context of the pyramid database unit to the MKL classifier unit of the current owner for the face identification, after the results of the face identification are returned, if a score vector exceeds a class threshold, the PDAC module labels an first access control with 1, which indicates that the identity of corresponding query face images needs to be annotated as recognized; and otherwise, the PDAC module labels the first access control with 0, which indicates that the first batch of access control procedure has to provide the MKL classifier unit of the current owner with the match set of face images of the next layer identity label subset that has been constructed to identify query faces again.