Patent ID: 8787625

Claim:
A method comprising: point matching a first plurality of RPPVSMs in a first image with a second plurality of RPPVSMs in a second image; and calculating a correspondence probability that the first plurality of RPPVSMs and the second plurality of RPPVSMs are from different persons, wherein one of the point matching or the calculating is performed by a processor, and wherein calculating a correspondence probability includes using: p ⁡ ( A , C , n , m , p ) = C p n ⁢ ∏ i = 0 p - 1 ⁢ ⁢ ( ( m - i ) ⁢ C A - iC ) ⁢ ∏ i = p n - 1 ⁢ ⁢ ( A - ( m + p - i ) ⁢ C A - iC ) where C=πr 2 , A is a size of overlapped total skin area of two images containing RPPVSMs, r is a distance threshold between two RPPVSMs to be considered matching, and p is a number of matching RPPVSMs of the first and second images.