The method of claim 1, wherein the step of extracting the numerical value comprises the steps of: ordering the detected minutiae by their respective distance from the detected core point as b1, b2, b3, . . . bn, wherein b is a detected minutia and n is the total number of detected minutiae; computing a distance between the core point and b1, as d1; computing a distance between b1, and b2 as d2; co