1. An information processing device comprising circuitry configured to: acquire a plurality of first study images and an input image; output an estimated degradation process on a basis of first similarities between an arbitrary region in the input image and respective ones of a plurality of first degraded images, wherein corresponding regions in the first study images are degraded on a basis of respective ones of a plurality of degradation processes; and create a dictionary that stores a plurality of patch pairs each of which includes a degraded patch and a restored patch, the degraded patch being a patch in a second degraded image into which a second study image is degraded on a basis of the estimated degradation process, the restored patch being a patch in the second study image, wherein the estimated degradation process corresponds to a degradation process in the degradation processes, the degradation process being related to the region in the input image.