Patent ID: 7436985

Claim:
A personal identity authentication process comprising the steps of: using linear discriminant analysis (LDA) to derive a class-specific linear discriminant transformation a i from N vectors z j (j=1,2 . . . N) defining respective training images, there being m different client classes of said training images, each said client class containing training images of a single client, with the i th class ω i containing a respective number N i of said training images such that N = ∑ i = 1 ⁢ m ⁢ N i , projecting a vector z p defining a probe image onto said class-specific linear discriminant transformation a i , comparing the projected vector a i T ⁢ z p with a reference vector for the i th client class ω i and evaluating authenticity of the probe image with respect to the i th client class in dependence on the comparison.