An efficient spatial domain technique for subpixel image registration

In this paper a new technique for performing image registration to subpixel accuracy is presented. The proposed technique, which is based on the maximization of the correlation coefficient, does not require the reconstruction of the intensity values and provides a closed-form solution to the subpixel translation estimation problem. Moreover, an efficient iterative scheme is proposed, which reduces considerably the overall computational cost of the image registration problem. This scheme properly combined with the subpixel accuracy technique results in a fast spatial domain technique for subpixel image registration.