Image Stitching using correlation

This matlab code reads two images and stitches them. The image registration method is done using correlation technique. A small patch of second image is taken as a mask. This mask correlates with the same size image pixels of the first image. The mask shifts and correlates. The point where the correlation is maximum (close to 1) is taken as optimum point. The point is used for stitching the second image over the first.