Patent ID: 6466685
Filing Date: 2002-10-15
Classification: G06K

Abstract:
A pattern recognition apparatus, comprising:image input means for inputting a plurality of face images of each of a plurality of people under a condition of similar illumination, each face image of the same person being input at a different time; input subspace calculation means for respectively calculating at least one subspace of each person from the plurality of face images of each person; difference subspace calculation means for respectively calculating a difference between two subspaces of two peolpe, and for calculating a common susbspace of all differences of each two people as a difference subspace; self variation subspace calculation means for respectively calculating a difference between two subspaces of the same person, and for calculating a common subspace of all differences of each person as a self variation subspace; constraint subspace calculation means for calculating a constraint subspace by subtracting the self variation subspace from the difference subspace; dictionary subspace memory for storing a plurality of dictionary subspaces each representing a face pattern of a registered person; projection means for projecting an input subspace and each dictionary subspace onto the constraint subspace, when said image input means inputs a face image of a person in question and said input subspace calculation means calculates the input subspace from the face image; and recognition means for recognizing the person in question by comparing the projected input subspace with each projected dictionary subspace.