Provided is an image processing apparatus comprising a region identifying section that identifies a partial region that fulfills a preset condition in a main image captured through an optical system in which an optical transfer function relating to light from an object point is substantially uniform regardless of a distance to the object point; and a correcting section that corrects an image of the partial region identified by the region identifying section, according to the optical transfer function of the optical system. The image processing apparatus may further comprise a condition storing section that stores the condition to be fulfilled by the partial region corrected by the correcting section, and the region identifying section may identify a partial region of the main image that fulfills the condition stored by the condition storing section.