1. A method of calculating source image coordinates comprising: calculating a value of an (N−1)-th order differential polynomial corresponding to a converted image coordinate n, by a recursive computation; and calculating the source image coordinate x n corresponding to the converted image coordinate n by using the value of the (N−1)-th order differential polynomial corresponding to the converted image coordinate n and the previous source image coordinate x n-1 corresponding to a previous converted image coordinate n−1, wherein the (N−1)-th order differential polynomial is differentiated from an N-th order polynomial x(n) with respect to the converted image coordinate n, the N-th order polynomial x(n) representing the source image coordinates x n with respect to the converted image coordinate n, and N denoting a natural number larger than 2, and wherein a second order differential polynomial is the same as the (N−1)-th order differential polynomial when N=3.