1. An imaging device that generates a taken image of an object in an image area by taking an image of each line structuring the image area, comprising: an inclination estimate unit that estimates an inclination of the object based on a portion of the taken image corresponding to a first line and a portion of the taken image corresponding to a second line; an image estimate unit that estimates an image of the object to be generated when the image is taken having an inclination estimated by the inclination estimate unit, based on the inclination; and a correction process unit that corrects the taken image based on a result of a comparison between the taken image and the image estimated by the image estimated unit.