1. An image processing device comprising: a first detecting unit that inputs a first image and a second image and detects a first positional aberration between the first image and the second image; a correcting unit that corrects the first positional aberration detected by the first detecting unit in the first image; a second detecting unit that detects a direction of the second positional aberration between the corrected first image and the second image; and a determining unit that determines an image orientation at the display of the first image and the second image based on the detected direction of the second positional aberration.