Reconstruction of biometric image templates using match scores

A method of reconstructing an unknown enrolled face image target template of a Face Recognition System, the method comprising

• inputting a plurality of known face image templates into the Face Recognition System;
• calculating a match score for each of the plurality of known face image templates and the unknown enrolled face image target template of the Face Recognition System;
• converting the match score for each of the plurality of known face image templates into a plurality of dot product distances;
• determining a set of configuration points for the plurality of dot product distances that reserves the match score for each of the plurality of known face image templates and the unknown enrolled face image target template of the Face Recognition System, wherein the set of configuration points comprises a set of vectors wherein a sum of the vectors in the set of vectors is equal to zero such that the center of the set of configuration points is at the origin;
• providing an affine transformation approximating the Face Recognition system based upon the set of configuration points;
• identifying coordinates for each of the configuration points in the set of configuration points in the affine transformation;
• approximating coordinates for the unknown enrolled face image target template in the affine transformation;
• and
• performing a pseudo-inversion of the affine transformation to reconstruct the unknown enrolled face image target template.