1. An X-ray imaging apparatus comprising: an X-ray source configured to radiate X-rays onto an object; and at least one processor configured to: generate a back projected image with respect to a projected image of a field of view (FOV), acquire a first low frequency component of the back projected image, generate a low frequency restored image based on the first low frequency component, acquire a high frequency component of the back projected image based on the low frequency restored image, generate a high frequency restored image based on the high frequency component, generate a restored image with respect to the back projected image by synthesizing the high frequency restored image and the low frequency restored image, and generate a corrected image by minimizing a loss frequency region using a plurality of restored images which are different from one another with respect to the loss frequency region.