37. The apparatus according to claim 33 , further comprising a classification unit for incorporating in an arrangement of said plurality of probabilities at least one hard constraint relating to persons from said plurality of persons, to obtain constrained inter-relational data results, performing a spectral analysis to obtain eigenvector results from said constrained inter-relational data results, and performing discretization of said eigenvector results using constrained clustering with a criterion to enforce said at least one hard constraint to obtain clusters relating to identities of persons from said plurality of persons.
38. The apparatus according to claim 37 , wherein said classification unit performs discretization using constrained K-means clustering.