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National security and crime prevention often depend on ability to establish the identities of individuals and check that they are whom they claim to be. This proof of identity is frequently achieved by comparing the individual's appearance to a photo-identification document such as a passport. Although there are now a number of automatic face-recognition devices available, none can cope with the kind of image variability encountered in the realworld. Even in relatively constrained settings performance is far from perfect, comprising an average of nine different photos for each of 3628 celebrities.
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