. . . . "In mathematical terms, the formula for a discrete two-dimensional vector correlation is given by: corr ??? ( x , y ) = ??? ??? ??? uv ??? ??? I ??? ( x - u , y - v ) ??? K ??? ( u , v ) where I is a vector image and K is a vector-kernel, x and y are image coordinates, and the summation is over a u and v range in the template." .