1. An image processing method, comprising: generating a second image by downscaling a first image which includes a first hole region, the first hole region being converted to a second hole region in the second image during the downscaling of the first image; restoring a value of a first pixel in the second hole region; upscaling the second hole region to a scale of the first hole region; and generating a third image by setting a value of a second pixel in the upscaled second hole region to a value of a third pixel in the first hole region, the third pixel corresponding to the second pixel.