Patent ID: 6430307
Filing Date: 2002-08-06
Classification: G06K

Abstract:
A pattern collation system comprising:a first sample pattern input means for receiving a set of samples of face patterns taken under a first photographing condition; a second sample pattern input means for receiving a set of samples of face patterns of a person identical to a person of said face patterns inputted through said first sample pattern input means, with said face patterns being taken under a second photographing condition; first storage means for storing said pattern sample set inputted through said first sample pattern input means, second storage means for storing said pattern sample set inputted through said second sample pattern input means; a difference pattern producing means for repeatedly deriving each of patterns corresponding to the identical person from each of said pattern sample sets stored in said first and second storage means to calculate a pattern corresponding to a difference therebetween; a principal-component analyzing means for making a principal-component analysis of a set of patterns obtained by addition of said pattern sample set stored in said first storage means and said difference pattern produced by said difference pattern producing means to output a principal component and a value expressing a variance in a principal-component direction; an analysis result storage means for storing data outputted from said principal-component analyzing means; a collation pattern input means for receiving two patterns to be collated; and a similarity calculating means for referring to said data stored in said analysis result storage means to calculate, on the basis of that result, a degree of similarity between said patterns read out from said collation pattern input means by weighting a component of said patterns in said principal-component direction.