1. An image processing apparatus comprising: an obtaining portion operable to obtain, regarding a target region of a subject, a first and a second image having different resolutions, as well as a third image indicating a subject characteristic; a rule learning portion which learns, from the first and second images, a resolution conversion rule for relating the first and second images to each other; and a regionally divided image generating portion which generates, from the third image, a regionally divided image that is divided into regions based on the subject characteristic, wherein the obtaining portion obtains the first and second images having different resolutions each for a specular reflection image and a diffuse reflection image.