1. An image processor, comprising: an image correcting unit operable to align object images acquired by imaging an object by at least two cameras from different points of view to thereby form at least two corrected object images, the corrected object images each including a plurality of horizontal lines and a plurality of pixels on each of the horizontal lines; and a matching unit operable to determine a correspondence between at least one pixel position on a horizontal line in one of the corrected object images and at least one pixel position on the same horizontal line in another of the corrected object images by determining a similarity in a brightness component and a color component at the pixel positions and a parallax between the corrected object images.