An image processing device according to one embodiment includes an acquisition unit, a generation unit, a calculation unit, and an estimation unit. The acquisition unit acquires an input image. The generation unit generates a plurality of comparison images by compressing a target region being at least part of the input image with each of a plurality of compression levels and expanding the compressed target region to its original size. The calculation unit calculates, for each of the plurality of comparison images, a degradation level of the comparison image with respect to the input image. The estimation unit estimates the blur level of the input image based on a plurality of calculated degradation levels.