1. A method of estimating, using a processor, a high-resolution image from multiple low-resolution images with a displacement, the method comprising: performing a registration of said multiple low-resolution images in a high-resolution image space; dividing said high-resolution image space into a plurality of areas with a predefined size; and defining estimated pixel values of all pixels that exist within at least one of said plurality of areas so as to be the same as an estimated pixel value of a pixel at a predefined representative position within said at least one of said plurality of areas.