A device includes: an image acquisition device acquiring a taken image in which a subject is imaged; a smoothing device generating a smoothed image by smoothing the taken image; a noise extraction device extracting a difference noise component from a difference between the taken image and the smoothed image; a noise addition device adding the difference noise component to the smoothed taken image; a map acquisition device acquiring a blurring strength map that represents a distribution of blurring strengths for the taken image; and an image combining device combining the taken image with the smoothed image on the basis of the blurring strength map, and generating an output image.