1. A method, comprising: operating an X-ray imaging device to acquire X-ray images including a first image and a second image; extracting a first X-ray dose associated with the first image and a second X-ray dose associated with the second image; calculating a dose ratio based on the first X-ray dose and the second X-ray dose; determining a template window in the first image and a plurality of search windows in the second image; generating a template vector corresponding to the template window and a plurality of search vectors corresponding to the plurality of search windows; calculating a plurality of similarity scores based on the template vector and the plurality of search vectors; determining a matching window from the plurality of search windows based on the plurality of similarity scores; generating a final image using the first image and the second image based on the template window and the matching window, one of the first image and the second image having been normalized based on the dose ratio, the normalized image being the one of the first image and the second image associated with a lower dose relative to the dose associated with the other of the first image and the second image; and displaying the final image on a display.